$140+ Cheap flights from San Francisco (SFO) to Ontario
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — YYZ
Aug 27 — Sep 31
Round-trip
1 adult, Economy
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Find cheap flights from San Francisco to Ontario with Cheapflights
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Cheapest flights from San Francisco to OntarioExplore the most affordable flight options available from San Francisco to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 28, 2026.
Explore the most affordable flight options available from San Francisco to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 28, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/156:00 am
SFO
- YYZ
2 stops12h 35m
WestJet
Mon 10/193:50 pm
YYZ
- SFO
1 stop9h 05m
WestJet
Deal found 7/27![WestJet logo]()
$297
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/156:00 am
SFO
- YYZ
2 stops12h 35m
WestJet
Sun 10/183:50 pm
YYZ
- SFO
1 stop9h 05m
WestJet
Deal found 7/23![WestJet logo]()
$299
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:00 am
SFO
- YYZ
2 stops10h 55m
WestJet
Tue 10/206:00 am
YYZ
- SFO
1 stop9h 00m
WestJet
Deal found 7/26![WestJet logo]()
$300
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:00 am
SFO
- YYZ
2 stops10h 55m
WestJet
Sat 10/176:00 am
YYZ
- SFO
1 stop9h 00m
WestJet
Deal found 7/26![WestJet logo]()
$301
This FlightHub deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/121:00 pm
SFO
- YYZ
2 stops13h 10m
WestJet
Thu 8/209:00 am
YYZ
- SFO
1 stop10h 40m
WestJet
Deal found 7/27![WestJet logo]()
$302
This Justfly.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:00 am
SFO
- YYZ
1 stop9h 55m
WestJet
Fri 8/283:50 pm
YYZ
- SFO
1 stop9h 05m
WestJet
Deal found 7/23![WestJet logo]()
$303
This FlightHub deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/121:00 pm
SFO
- YYZ
2 stops13h 10m
WestJet
Wed 8/1910:50 am
YYZ
- SFO
1 stop8h 50m
WestJet
Deal found 7/23![WestJet logo]()
$304
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/121:00 pm
SFO
- YYZ
1 stop9h 05m
WestJet
Thu 9/176:00 am
YYZ
- SFO
1 stop9h 00m
WestJet
Deal found 7/27![WestJet logo]()
$305
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:00 am
SFO
- YYZ
2 stops12h 10m
WestJet
Fri 8/2110:00 am
YYZ
- SFO
1 stop9h 40m
WestJet
Deal found 7/23![WestJet logo]()
$306
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/11:00 pm
SFO
- YYZ
2 stops13h 10m
WestJet
Wed 10/2110:50 am
YYZ
- SFO
1 stop8h 50m
WestJet
Deal found 7/26![WestJet logo]()
$307
This Justfly.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/181:00 pm
SFO
- YYZ
1 stop9h 05m
WestJet
Thu 8/202:50 pm
YYZ
- SFO
1 stop10h 05m
WestJet
Deal found 7/27![WestJet logo]()
$308
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:00 am
SFO
- YYZ
1 stop8h 10m
WestJet
Thu 10/153:50 pm
YYZ
- SFO
1 stop9h 05m
WestJet
Deal found 7/26![WestJet logo]()
$309
Best flights from San Francisco to OntarioDiscover carefully curated flight deals from San Francisco to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 28, 2026.
Discover carefully curated flight deals from San Francisco to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 28, 2026.
This FlightHub deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:00 am
SFO
- YKF
1 stop10h 50m
WestJet
Sun 10/188:40 pm
YKF
- SFO
1 stop18h 20m
WestJet
Deal found 7/25![WestJet logo]()
$352
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:00 am
SFO
- YOW
1 stop10h 20m
Multiple Airlines
Fri 10/91:20 pm
YOW
- SFO
2 stops22h 03m
Multiple Airlines
Deal found 7/25![Multiple Airlines logo]()
$403
This Air Canada deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/234:30 pm
SFO
- YXU
2 stops13h 50m
Air Canada
Sat 9/265:40 am
YXU
- SFO
1 stop9h 54m
Air Canada
Deal found 7/26![Air Canada logo]()
$411
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1110:51 pm
SFO
- YXU
1 stop7h 29m
United Airlines
Wed 8/123:30 pm
YXU
- SFO
2 stops22h 12m
United Airlines
Deal found 7/26![United Airlines logo]()
$492
This Porter Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Porter Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/191:20 pm
SFO
- YUL
1 stop8h 17m
Porter Airlines
Wed 10/286:45 am
YUL
- SFO
1 stop9h 00m
Porter Airlines
Deal found 7/26![Porter Airlines logo]()
$503
This Alaska Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/285:45 pm
SFO
- YYZ
1 stop19h 20m
Alaska Airlines
Mon 11/25:15 pm
YYZ
- SFO
2 stops18h 45m
Alaska Airlines
Deal found 7/27![Alaska Airlines logo]()
$571
This Delta deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2511:30 pm
SFO
- YUL
1 stop9h 08m
Delta
Fri 10/307:00 am
YUL
- SFO
2 stops19h 56m
Delta
Deal found 7/26![Delta logo]()
$657
This Trip.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:00 am
SFO
- YOW
1 stop8h 15m
WestJet
Mon 9/2812:25 pm
YOW
- SFO
2 stops12h 30m
WestJet
Deal found 7/27![WestJet logo]()
$358
This FlightHub deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:05 pm
SFO
- YXU
1 stop8h 15m
WestJet
Tue 8/185:55 pm
YXU
- SFO
1 stop31h 00m
WestJet
Deal found 7/26![WestJet logo]()
$360
This Air Canada deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/168:10 am
SFO
- YQT
2 stops12h 19m
Air Canada
Thu 8/205:10 am
YQT
- SFO
2 stops18h 41m
Air Canada
Deal found 7/25![Air Canada logo]()
$418
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:00 am
SFO
- YHM
2 stops13h 25m
Multiple Airlines
Wed 9/166:05 am
YHM
- SFO
2 stops18h 50m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$422
This Trip.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:00 am
SFO
- YHM
1 stop8h 15m
WestJet
Tue 10/206:10 pm
YHM
- SFO
1 stop20h 50m
WestJet
Deal found 7/26![WestJet logo]()
$367
This Air Canada deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1511:35 am
SFO
- YQT
1 stop8h 28m
Air Canada
Sat 9/195:05 am
YQT
- SFO
1 stop8h 39m
Air Canada
Deal found 7/26![Air Canada logo]()
$426
This Mytrip deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/96:00 am
SFO
- YHM
1 stop14h 13m
Multiple Airlines
Wed 9/1611:45 am
YHM
- SFO
2 stops13h 10m
Multiple Airlines
Deal found 7/26![Multiple Airlines logo]()
$427
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/214:40 pm
SFO
- YQT
2 stops21h 49m
United Airlines
Fri 8/285:10 am
YQT
- SFO
1 stop8h 35m
United Airlines
Deal found 7/23![United Airlines logo]()
$497
This Trip.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:00 am
SFO
- YKF
1 stop10h 50m
WestJet
Mon 9/288:40 pm
YKF
- SFO
1 stop18h 20m
WestJet
Deal found 7/25![WestJet logo]()
$387
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/146:00 am
SFO
- YHM
2 stops13h 25m
Multiple Airlines
Fri 9/186:05 am
YHM
- SFO
2 stops18h 50m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$441
This United Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/279:30 pm
SFO
- YXU
2 stops14h 20m
United Airlines
Mon 8/3110:05 am
YXU
- SFO
2 stops13h 25m
United Airlines
Deal found 7/25![United Airlines logo]()
$502
This Trip.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:00 am
SFO
- YKF
1 stop10h 50m
WestJet
Sun 9/208:40 pm
YKF
- SFO
1 stop28h 15m
WestJet
Deal found 7/23![WestJet logo]()
$387
This Air Canada deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/254:40 pm
SFO
- YQG
1 stop13h 42m
Air Canada
Thu 8/274:05 pm
YQG
- SFO
1 stop7h 57m
Air Canada
Deal found 7/27![Air Canada logo]()
$473
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2610:35 pm
SFO
- YOW
2 stops15h 48m
Multiple Airlines
Wed 9/26:00 am
YOW
- SFO
1 stop9h 00m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$446
This oojo deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:00 am
SFO
- YOW
1 stop8h 15m
WestJet
Sun 9/276:15 pm
YOW
- SFO
2 stops30h 40m
WestJet
Deal found 7/26![WestJet logo]()
$392
This Air Canada deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/184:40 pm
SFO
- YQG
1 stop13h 42m
Air Canada
Sat 8/2210:05 am
YQG
- SFO
2 stops13h 46m
Air Canada
Deal found 7/25![Air Canada logo]()
$482
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/510:51 pm
SFO
- YYZ
Nonstop5h 09m
United Airlines
Fri 10/96:30 am
YYZ
- SFO
Nonstop5h 38m
United Airlines
Deal found 7/23![United Airlines logo]()
$537
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/196:05 pm
SFO
- YKF
1 stop17h 55m
Multiple Airlines
Tue 8/257:05 pm
YKF
- SFO
3 stops29h 50m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$477
This Trip.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/96:00 am
SFO
- YOW
1 stop8h 15m
WestJet
Sat 9/267:20 am
YOW
- SFO
1 stop17h 35m
WestJet
Deal found 7/26![WestJet logo]()
$395
This Air Canada deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/184:40 pm
SFO
- YQG
1 stop13h 42m
Air Canada
Fri 8/2110:05 am
YQG
- SFO
2 stops13h 46m
Air Canada
Deal found 7/25![Air Canada logo]()
$482
This Delta deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/286:20 am
SFO
- YUL
2 stops14h 20m
Delta
Wed 9/26:00 am
YUL
- SFO
2 stops13h 56m
Delta
Deal found 7/26![Delta logo]()
$709
This Porter Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Porter Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/221:20 pm
SFO
- YUL
1 stop8h 17m
Porter Airlines
Mon 10/267:55 pm
YUL
- SFO
2 stops23h 27m
Porter Airlines
Deal found 7/26![Porter Airlines logo]()
$712
This United Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/282:05 pm
SFO
- YYZ
1 stop6h 54m
United Airlines
Thu 9/35:16 pm
YYZ
- SFO
Nonstop5h 36m
United Airlines
Deal found 7/25![United Airlines logo]()
$547
Last-minute flights from San Francisco to OntarioDiscover last-minute flight deals from San Francisco to Ontario. Data last updated July 28, 2026 and is based on user searches.
Discover last-minute flight deals from San Francisco to Ontario. Data last updated July 28, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/96:00 am
SFO
- YYZ
1 stop9h 55m
WestJet
Wed 8/196:00 am
YYZ
- SFO
1 stop9h 00m
WestJet
Deal found 7/23![WestJet logo]()
$307
This FlightHub deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/121:00 pm
SFO
- YYZ
2 stops13h 10m
WestJet
Thu 8/2012:40 pm
YYZ
- SFO
2 stops12h 15m
WestJet
Deal found 7/27![WestJet logo]()
$301
This FlightHub deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/121:00 pm
SFO
- YYZ
2 stops13h 10m
WestJet
Wed 8/1910:50 am
YYZ
- SFO
1 stop8h 50m
WestJet
Deal found 7/23![WestJet logo]()
$304
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/121:00 pm
SFO
- YYZ
1 stop9h 05m
WestJet
Thu 9/176:00 am
YYZ
- SFO
1 stop9h 00m
WestJet
Deal found 7/27![WestJet logo]()
$305
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:00 am
SFO
- YYZ
2 stops12h 10m
WestJet
Sat 8/222:50 pm
YYZ
- SFO
1 stop10h 05m
WestJet
Deal found 7/25![WestJet logo]()
$300
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:00 am
SFO
- YYZ
2 stops12h 10m
WestJet
Fri 8/2110:00 am
YYZ
- SFO
1 stop9h 40m
WestJet
Deal found 7/23![WestJet logo]()
$306
This Justfly.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:00 am
SFO
- YYZ
1 stop9h 55m
WestJet
Fri 8/283:50 pm
YYZ
- SFO
1 stop9h 05m
WestJet
Deal found 7/23![WestJet logo]()
$303
This Justfly.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:05 pm
SFO
- YXU
1 stop8h 15m
WestJet
Tue 8/182:40 pm
YXU
- SFO
2 stops24h 20m
WestJet
Deal found 7/24![WestJet logo]()
$355
This Justfly.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/181:00 pm
SFO
- YYZ
1 stop9h 05m
WestJet
Thu 8/202:50 pm
YYZ
- SFO
1 stop10h 05m
WestJet
Deal found 7/27![WestJet logo]()
$308
This FlightHub deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:05 pm
SFO
- YYZ
1 stop9h 50m
Multiple Airlines
Wed 9/99:45 am
YYZ
- SFO
Nonstop5h 35m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$311
This FlightHub deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/236:00 am
SFO
- YYZ
1 stop9h 55m
WestJet
Fri 8/282:50 pm
YYZ
- SFO
1 stop10h 05m
WestJet
Deal found 7/25![WestJet logo]()
$309
This Justfly.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:00 am
SFO
- YYZ
1 stop9h 55m
WestJet
Sat 8/296:00 am
YYZ
- SFO
1 stop9h 00m
WestJet
Deal found 7/26![WestJet logo]()
$310
One-way flights from San Francisco to OntarioSearch for one-way flight options from San Francisco to Ontario. Find affordable one-way fares based on user searches. Data last updated July 28, 2026.
Search for one-way flight options from San Francisco to Ontario. Find affordable one-way fares based on user searches. Data last updated July 28, 2026.
This FlightHub deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/206:00 am
SFO
- YOW
1 stop10h 20m
WestJet
Deal found 7/24![WestJet logo]()
$140
This oojo deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:00 am
SFO
- YHM
1 stop8h 15m
WestJet
Deal found 7/26![WestJet logo]()
$142
This Kiwi.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:00 am
SFO
- YOW
1 stop8h 15m
WestJet
Deal found 7/24![WestJet logo]()
$146
This Super.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/156:00 am
SFO
- YHM
1 stop8h 15m
WestJet
Deal found 7/26![WestJet logo]()
$155
This oojo deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/206:00 am
SFO
- YHM
1 stop8h 15m
WestJet
Deal found 7/25![WestJet logo]()
$157
This FlightHub deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:00 am
SFO
- YHM
1 stop8h 15m
WestJet
Deal found 7/27![WestJet logo]()
$160
This oojo deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:00 am
SFO
- YHM
1 stop8h 15m
WestJet
Deal found 7/26![WestJet logo]()
$168
This oojo deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/146:00 am
SFO
- YHM
1 stop8h 15m
WestJet
Deal found 7/24![WestJet logo]()
$169
This oojo deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/171:00 pm
SFO
- YHM
1 stop25h 15m
WestJet
Deal found 7/27![WestJet logo]()
$176
This oojo deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/126:00 am
SFO
- YYZ
1 stop16h 05m
WestJet
Deal found 7/27![WestJet logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/157:11 pm
SFO
- YYZ
3 stops30h 59m
Multiple Airlines
Deal found 7/26![Multiple Airlines logo]()
$190
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:00 am
SFO
- YTZ
3 stops34h 30m
Multiple Airlines
Deal found 7/26![Multiple Airlines logo]()
$190
Find flight deals from San Francisco to Ontario
Keep the following information in mind while searching for San Francisco to Ontario flight deals. Data was last updated July 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $297 (Kiwi.com) |
One-way from | $140 (FlightHub) |
Popular in | December |
Cheapest in | January |
Average price | $584 |
Good round-trip deal | $529 or less |
Good one-way deal | $257 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from San Francisco to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 28, 2026.
Use the filters below to find and compare flights from San Francisco to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San FranciscoToronto
SFO - YKF
SFOYKF
San Francisco
Fri 10/16
6:00 am-7:50 pm
1 stop10h 50m
Toronto Region of Waterloo Intl
Sun 10/18
8:40 pm-12:00 pm
1 stop18h 20m
$352
San FranciscoOttawa
SFO - YOW
SFOYOW
San Francisco
Sat 9/26
6:00 am-5:15 pm
1 stop8h 15m
Ottawa
Mon 9/28
12:25 pm-9:55 pm
2 stops12h 30m
$358
San FranciscoLondon
SFO - YXU
SFOYXU
San Francisco
Mon 8/17
6:05 pm-5:20 am
1 stop8h 15m
London
Tue 8/18
5:55 pm-9:55 pm
1 stop31h 00m
$360
San FranciscoHamilton
SFO - YHM
SFOYHM
San Francisco
Tue 10/6
6:00 am-5:15 pm
1 stop8h 15m
Hamilton
Tue 10/20
6:10 pm-12:00 pm
1 stop20h 50m
$367
San FranciscoToronto
SFO - YKF
SFOYKF
San Francisco
Fri 9/25
6:00 am-7:50 pm
1 stop10h 50m
Toronto Region of Waterloo Intl
Mon 9/28
8:40 pm-12:00 pm
1 stop18h 20m
$387
San FranciscoToronto
SFO - YKF
SFOYKF
San Francisco
Wed 9/16
6:00 am-7:50 pm
1 stop10h 50m
Toronto Region of Waterloo Intl
Sun 9/20
8:40 pm-9:55 pm
1 stop28h 15m
$387
San FranciscoOttawa
SFO - YOW
SFOYOW
San Francisco
Fri 9/25
6:00 am-5:15 pm
1 stop8h 15m
Ottawa
Sun 9/27
6:15 pm-9:55 pm
2 stops30h 40m
$392
San FranciscoOttawa
SFO - YOW
SFOYOW
San Francisco
Wed 9/9
6:00 am-5:15 pm
1 stop8h 15m
Ottawa
Sat 9/26
7:20 am-9:55 pm
1 stop17h 35m
$395
San FranciscoOttawa
SFO - YOW
SFOYOW
San Francisco
Thu 10/1
6:00 am-7:20 pm
1 stop10h 20m
Ottawa
Fri 10/9
1:20 pm-8:23 am
2 stops22h 03m
$403
San FranciscoLondon
SFO - YXU
SFOYXU
San Francisco
Wed 9/23
4:30 pm-9:20 am
2 stops13h 50m
London
Sat 9/26
5:40 am-12:34 pm
1 stop9h 54m
$411
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from San Francisco to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from San Francisco with our price prediction graph.
SFO-YOW
SFO-YHM
SFO-YYZ
SFO-YTZ
SFO-YXU
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from San Francisco to Ontario
SFO-CAON
SFO-YOW
SFO-YHM
SFO-YYZ
SFO-YTZ
What is the cheapest month to book a flight from San Francisco to Region of Ontario?
Currently, February is the cheapest month in which you can book a flight from San Francisco to Region of Ontario (average of $394). Flying from San Francisco to Region of Ontario in December is currently the most expensive (average of $639). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from SFO to ON?
Find hourly flight availability from San Francisco to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 28, 2026.
One of the essential ways to save on airfare from San Francisco to Region of Ontario is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 27% on airfare.
Weekly flight availability from San Francisco to Region of Ontario
Explore weekly flight availability from San Francisco to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 28, 2026.
The most flights from SFO to CAON are scheduled on a Monday (25 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (17 on average).
How much does it cost to fly round-trip from San Francisco to Region of Ontario?
Airfare is below average for this route at the moment.
San Francisco to Region of Ontario flights typically cost between $403 and $634 in October.The cheapest round-trip price found within the last 5 days was $297 on WestJet (Oct 15-Oct 19).
How far ahead should I book a flight from San Francisco to Region of Ontario?
The price you pay for your flight from San Francisco to Region of Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 44 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest day to fly from San Francisco to Region of Ontario?
Use this chart to determine the cheapest time to fly round-trip from San Francisco to Ontario. Price data was last updated on July 25, 2026.
Travelers seeking maximum savings on their San Francisco to Region of Ontario flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated July 28, 2026.
Peruse reviews from past customers who have flown with Porter Airlines,Delta, andUnited Airlines from San Francisco to Ontario to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Food
7.5
Overall
8.0
Comfort
8.0
Boarding
8.2
Entertainment
6.9
Reviews
1 / 20
6.0
GoodShannon,Jul 2026
YQT - YOW
Crew
8.6
Food
7.5
Overall
8.0
Comfort
8.0
Boarding
8.2
Entertainment
6.9
Reviews
1 / 20
6.0
GoodShannon,Jul 2026
YQT - YOW
Crew
8.6
Food
7.5
Overall
8.0
Comfort
8.0
Boarding
8.2
Entertainment
6.9
Reviews
1 / 20
6.0
GoodShannon,Jul 2026
YQT - YOW
Crew
8.6
Food
7.5
Overall
8.0
Comfort
8.0
Boarding
8.2
Entertainment
6.9
Reviews
1 / 20
6.0
GoodShannon,Jul 2026
YQT - YOW
Crew
8.6
Food
7.5
Overall
8.0
Comfort
8.0
Boarding
8.2
Entertainment
6.9
Reviews
1 / 20
6.0
GoodShannon,Jul 2026
YQT - YOW
Crew
8.6
Food
7.5
Overall
8.0
Comfort
8.0
Boarding
8.2
Entertainment
6.9
Reviews
1 / 20
6.0
GoodShannon,Jul 2026
YQT - YOW
Related info for your journey
Find useful and relevant information for your journey from San Francisco to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for San Francisco to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from San Francisco to Ontario by cabin class
Find flights from San Francisco to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
San Francisco and Ontario flights
Browse other San Francisco and Ontario flight options. Last updated on July 28, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
San Francisco to Ontario flights
Consider these flights traveling from San Francisco to Ontario.
Top 8 airlines flying from San Francisco to Ontario
Discover the top 8 airlines that operate flights from San Francisco to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$143 | Average$475 | FlexibilityNo cancel fee | On-time60% | |
| Cheapest$160 | Average$503 | FlexibilityNo cancel fee | On-time50% | |
| Cheapest$163 | Average$476 | FlexibilityNo cancel fee | On-time52% | |
| Cheapest$202 | Average$419 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$210 | Average$650 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$338 | Average$404 | FlexibilityNo cancel fee | On-time68% | |
| Cheapest$402 | Average$746 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$448 | Average$621 | FlexibilityNo cancel fee | On-time71% |