$126+ Cheap flights from Ontario to San Francisco (SFO)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SFO
Oct 8 — Oct 151
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to San Francisco with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Ontario to San Francisco
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Cheapest flights from Ontario to San FranciscoExplore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 8, 2026.
Explore the most affordable flight options available from Ontario to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 8, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 9/226:10 am -
1 stop8h 50m
Thu 10/16:00 am -
1 stop7h 45m
Deal found 9/3![WestJet logo]()
$252
This Air Canada deal was found by Cheapflights users on 9/6. 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.
Mon 12/710:35 am -
1 stop8h 05m
Tue 12/88:25 am -
1 stop7h 20m
Deal found 9/6![Air Canada logo]()
$275
This Trip.com deal was found by Cheapflights users on 9/7. 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 10/246:10 am -
1 stop8h 50m
Sun 11/14:40 pm -
1 stop9h 55m
Deal found 9/7![WestJet logo]()
$280
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 9/226:10 am -
1 stop8h 50m
Sat 10/31:00 pm -
1 stop13h 20m
Deal found 9/3![WestJet logo]()
$284
This Air Canada deal was found by Cheapflights users on 9/5. 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 10/2010:05 am -
2 stops13h 42m
Tue 10/278:25 am -
1 stop7h 20m
Deal found 9/5![Air Canada logo]()
$290
This Justfly.com deal was found by Cheapflights users on 9/3. 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.
Fri 9/112:50 pm -
1 stop10h 05m
Mon 9/146:00 am -
2 stops12h 35m
Deal found 9/3![WestJet logo]()
$291
This Cheapflightsfares deal was found by Cheapflights users on 9/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/152:50 pm -
1 stop10h 05m
Sun 10/181:00 pm -
1 stop8h 10m
Deal found 9/3![WestJet logo]()
$292
This Cheapflightsfares deal was found by Cheapflights users on 9/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/143:50 pm -
1 stop9h 05m
Tue 10/201:00 pm -
1 stop8h 10m
Deal found 9/3![WestJet logo]()
$293
This Trip.com deal was found by Cheapflights users on 9/3. 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 10/1410:00 am -
1 stop9h 40m
Mon 10/196:00 am -
2 stops10h 55m
Deal found 9/3![WestJet logo]()
$294
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 -
1 stop9h 00m
Mon 10/196:00 am -
2 stops10h 55m
Deal found 9/3![WestJet logo]()
$295
This Air Canada deal was found by Cheapflights users on 9/3. 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.
Thu 10/299:15 am -
1 stop9h 25m
Sat 10/318:25 am -
1 stop8h 27m
Deal found 9/3![Air Canada logo]()
$295
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 9/223:50 pm -
1 stop9h 05m
Mon 9/286:00 am -
1 stop8h 10m
Deal found 9/3![WestJet logo]()
$296
Best flights from Ontario to San FranciscoDiscover carefully curated flight deals from Ontario to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 8, 2026.
Discover carefully curated flight deals from Ontario to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 8, 2026.
This Air Canada deal was found by Cheapflights users on 9/6. 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.
Mon 12/710:35 am -
1 stop8h 05m
Tue 12/88:25 am -
1 stop7h 20m
Deal found 9/6![Air Canada logo]()
$275
This Justfly.com deal was found by Cheapflights users on 9/6. 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 9/226:10 pm -
1 stop20h 50m
Mon 9/286:00 am -
1 stop8h 15m
Deal found 9/6![WestJet logo]()
$320
This Delta deal was found by Cheapflights users on 9/6. 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.
Sat 10/101:34 pm -
1 stop12h 25m
Sun 10/1810:55 pm -
1 stop6h 54m
Deal found 9/6![Delta logo]()
$355
This Porter Airlines deal was found by Cheapflights users on 9/7. 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.
Sat 10/249:45 am -
Nonstop5h 35m
Thu 10/291:45 pm -
Nonstop4h 54m
Deal found 9/7![Porter Airlines logo]()
$379
This United deal was found by Cheapflights users on 9/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:30 am -
Nonstop5h 38m
Sun 11/18:25 am -
Nonstop4h 49m
Deal found 9/7![Multiple Airlines logo]()
$385
This United Airlines deal was found by Cheapflights users on 9/3. 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.
Sat 10/103:30 pm -
2 stops20h 05m
Sun 10/1112:35 am -
2 stops11h 15m
Deal found 9/3![United Airlines logo]()
$418
This Air Canada deal was found by Cheapflights users on 9/5. 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 10/2010:05 am -
2 stops13h 42m
Tue 10/278:25 am -
1 stop7h 20m
Deal found 9/5![Air Canada logo]()
$290
This Justfly.com deal was found by Cheapflights users on 9/4. 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.
Fri 9/188:40 pm -
1 stop18h 20m
Mon 9/216:00 am -
1 stop10h 50m
Deal found 9/4![WestJet logo]()
$326
This Delta deal was found by Cheapflights users on 9/5. 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.
Tue 10/276:00 am -
1 stop7h 30m
Sun 11/110:45 pm -
1 stop7h 04m
Deal found 9/5![Delta logo]()
$356
This Trip.com deal was found by Cheapflights users on 9/6. 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 9/188:40 pm -
1 stop18h 20m
Wed 9/306:00 am -
1 stop10h 50m
Deal found 9/6![WestJet logo]()
$328
This United deal was found by Cheapflights users on 9/5. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:30 am -
Nonstop5h 38m
Tue 10/611:35 am -
Nonstop5h 05m
Deal found 9/5![Multiple Airlines logo]()
$388
This Porter Airlines deal was found by Cheapflights users on 9/3. 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 10/265:55 pm -
2 stops21h 50m
Fri 10/301:45 pm -
1 stop7h 50m
Deal found 9/3![Porter Airlines logo]()
$393
This Justfly.com deal was found by Cheapflights users on 9/6. 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 9/228:40 pm -
1 stop18h 20m
Mon 9/286:00 am -
1 stop10h 50m
Deal found 9/6![WestJet logo]()
$334
This Air Canada deal was found by Cheapflights users on 9/5. 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.
Fri 9/187:45 pm -
1 stop17h 59m
Tue 9/228:30 am -
1 stop7h 32m
Deal found 9/5![Air Canada logo]()
$370
This United Airlines deal was found by Cheapflights users on 9/3. 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.
Sat 9/265:40 am -
1 stop9h 54m
Mon 10/510:51 pm -
1 stop7h 29m
Deal found 9/3![United Airlines logo]()
$427
This Delta deal was found by Cheapflights users on 9/4. 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 10/97:45 am -
1 stop12h 40m
Sun 10/189:25 pm -
1 stop11h 54m
Deal found 9/4![Delta logo]()
$397
This United deal was found by Cheapflights users on 9/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/236:30 am -
Nonstop6h 05m
Wed 12/306:30 am -
1 stop10h 27m
Deal found 9/7![Multiple Airlines logo]()
$405
This FlightHub deal was found by Cheapflights users on 9/5. 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 10/146:10 pm -
1 stop30h 45m
Sun 10/186:00 am -
1 stop8h 15m
Deal found 9/5![WestJet logo]()
$335
This Air Canada deal was found by Cheapflights users on 9/5. 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.
Thu 10/298:30 pm -
2 stops20h 21m
Sat 10/318:25 am -
2 stops22h 12m
Deal found 9/5![Air Canada logo]()
$384
This Porter Airlines deal was found by Cheapflights users on 9/5. 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.
Fri 10/239:45 am -
Nonstop5h 35m
Mon 11/21:45 pm -
Nonstop4h 54m
Deal found 9/5![Porter Airlines logo]()
$423
This United Airlines deal was found by Cheapflights users on 9/3. 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.
Sat 9/263:30 pm -
1 stop8h 29m
Sun 10/410:51 pm -
1 stop7h 29m
Deal found 9/3![United Airlines logo]()
$427
This Delta deal was found by Cheapflights users on 9/4. 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 10/49:45 am -
1 stop11h 24m
Mon 10/1910:55 pm -
1 stop6h 54m
Deal found 9/4![Delta logo]()
$397
This FlightHub deal was found by Cheapflights users on 9/5. 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 10/136:10 pm -
1 stop30h 45m
Sun 10/186:00 am -
1 stop8h 15m
Deal found 9/5![WestJet logo]()
$335
This United deal was found by Cheapflights users on 9/3. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:10 am -
1 stop8h 34m
Wed 9/304:40 pm -
Nonstop4h 56m
Deal found 9/3![Multiple Airlines logo]()
$411
This United Airlines deal was found by Cheapflights users on 9/3. 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 9/2510:05 am -
1 stop8h 19m
Mon 10/510:51 pm -
1 stop7h 29m
Deal found 9/3![United Airlines logo]()
$427
This deal was found by Cheapflights users on 9/7. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2710:45 am -
1 stop13h 02m
Sun 10/48:10 am -
1 stop10h 20m
Deal found 9/7![Air Canada logo]()
$393
This FlightHub deal was found by Cheapflights users on 9/5. 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 10/136:10 pm -
1 stop20h 50m
Fri 10/166:00 am -
1 stop8h 15m
Deal found 9/5![WestJet logo]()
$335
This Kiwi.com deal was found by Cheapflights users on 9/8. 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.
Fri 10/307:00 am -
1 stop8h 45m
Wed 11/47:25 pm -
2 stops25h 36m
Deal found 9/8![Multiple Airlines logo]()
$420
This Delta deal was found by Cheapflights users on 9/3. 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 10/166:50 am -
2 stops13h 35m
Tue 10/278:00 am -
2 stops13h 44m
Deal found 9/3![Delta logo]()
$421
This United Airlines deal was found by Cheapflights users on 9/3. 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 9/216:20 pm -
1 stop7h 44m
Mon 10/510:51 pm -
1 stop7h 29m
Deal found 9/3![United Airlines logo]()
$427
Last-minute flights from Ontario to San FranciscoDiscover last-minute flight deals from Ontario to San Francisco. Data last updated September 8, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to San Francisco. Data last updated September 8, 2026 and is based on user searches.
This Justfly.com deal was found by Cheapflights users on 9/3. 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.
Fri 9/112:50 pm -
1 stop10h 05m
Mon 9/146:00 am -
2 stops12h 35m
Deal found 9/3![WestJet logo]()
$291
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 9/226:10 am -
1 stop8h 50m
Thu 10/16:00 am -
1 stop7h 45m
Deal found 9/3![WestJet logo]()
$252
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 9/226:10 am -
1 stop8h 50m
Sat 10/31:00 pm -
1 stop13h 20m
Deal found 9/3![WestJet logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 9/223:50 pm -
1 stop9h 05m
Mon 9/286:00 am -
1 stop8h 10m
Deal found 9/3![WestJet logo]()
$296
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 10/112:40 pm -
2 stops12h 15m
Sun 10/46:00 am -
1 stop8h 10m
Deal found 9/3![WestJet logo]()
$297
This Cheapflightsfares deal was found by Cheapflights users on 9/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/143:50 pm -
1 stop9h 05m
Tue 10/201:00 pm -
1 stop8h 10m
Deal found 9/3![WestJet logo]()
$293
This Trip.com deal was found by Cheapflights users on 9/3. 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 10/1410:00 am -
1 stop9h 40m
Mon 10/196:00 am -
2 stops10h 55m
Deal found 9/3![WestJet logo]()
$294
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 -
1 stop9h 00m
Sun 10/186:00 am -
2 stops10h 35m
Deal found 9/3![WestJet logo]()
$292
This Kiwi.com deal was found by Cheapflights users on 9/3. 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 -
1 stop9h 00m
Mon 10/196:00 am -
2 stops10h 55m
Deal found 9/3![WestJet logo]()
$295
This Air Canada deal was found by Cheapflights users on 9/5. 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 10/2010:05 am -
2 stops13h 42m
Tue 10/278:25 am -
1 stop7h 20m
Deal found 9/5![Air Canada logo]()
$290
This Trip.com deal was found by Cheapflights users on 9/7. 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 10/246:10 am -
1 stop8h 50m
Sun 11/14:40 pm -
1 stop9h 55m
Deal found 9/7![WestJet logo]()
$280
This Air Canada deal was found by Cheapflights users on 9/3. 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.
Thu 10/299:15 am -
1 stop9h 25m
Sat 10/318:25 am -
1 stop8h 27m
Deal found 9/3![Air Canada logo]()
$295
One-way flights from Ontario to San FranciscoSearch for one-way flight options from Ontario to San Francisco. Find affordable one-way fares based on user searches. Data last updated September 8, 2026.
Search for one-way flight options from Ontario to San Francisco. Find affordable one-way fares based on user searches. Data last updated September 8, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/4. 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 10/14:00 pm -
1 stop8h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![WestJet logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 10/206:10 am -
1 stop8h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![WestJet logo]()
$168
This Air Canada deal was found by Cheapflights users on 9/5. 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.
Mon 11/99:15 am -
1 stop9h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Air Canada logo]()
$169
This Trip.com deal was found by Cheapflights users on 9/7. 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.
Mon 10/196:10 am -
1 stop8h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![WestJet logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 9/4. 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 10/112:25 pm -
2 stops12h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![WestJet logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 9/3. 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.
Fri 10/212:25 pm -
2 stops12h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![WestJet logo]()
$177
This Air Canada deal was found by Cheapflights users on 9/7. 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 11/225:30 am -
1 stop8h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Air Canada logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 10/76:55 am -
2 stops12h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![WestJet logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 9/4. 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.
Fri 10/27:20 am -
2 stops35h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Multiple Airlines logo]()
$188
This Justfly.com deal was found by Cheapflights users on 9/5. 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.
Fri 9/186:10 pm -
1 stop20h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![WestJet logo]()
$193
This FlightHub deal was found by Cheapflights users on 9/6. 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 11/67:00 am -
1 stop8h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Air Transat logo]()
$193
This Booking.com deal was found by Cheapflights users on 9/4. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:10 pm -
1 stop30h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![WestJet logo]()
$195
Find flight deals from Ontario to San Francisco
Keep the following information in mind while searching for Ontario to San Francisco flight deals. Data was last updated September 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $252 (Kiwi.com) |
One-way from | $126 (Kiwi.com) |
Popular in | July |
Cheapest in | January |
Average price | $391 |
Good round-trip deal | $402 or less |
Good one-way deal | $257 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to San Francisco 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 7,457,451 searches. Data last updated September 8, 2026.
Use the filters below to find and compare flights from Ontario to San Francisco that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OttawaSan Francisco
YOW Ottawa - SFO San Francisco
YOWSFO
Ottawa
Thu 10/1
12:25 pm-9:55 pm
2 stops12h 30m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$178
LondonSan Francisco
YXU London - SFO San Francisco
YXUSFO
London
Sun 11/22
5:30 am-11:10 am
1 stop8h 40m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$178
OttawaSan Francisco
YOW Ottawa - SFO San Francisco
YOWSFO
Ottawa
Wed 10/7
6:55 am-4:40 pm
2 stops12h 45m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$186
WindsorSan Francisco
YQG Windsor - SFO San Francisco
YQGSFO
Windsor
Thu 10/1
4:00 pm-9:55 pm
1 stop8h 55m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$197
HamiltonSan Francisco
YHM Hamilton - SFO San Francisco
YHMSFO
Hamilton
Thu 12/10
3:25 pm-3:50 pm
1 stop27h 25m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$202
HamiltonSan Francisco
YHM Hamilton - SFO San Francisco
YHMSFO
Hamilton
Fri 10/16
6:10 pm-12:00 pm
1 stop20h 50m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$202
HamiltonSan Francisco
YHM Hamilton - SFO San Francisco
YHMSFO
Hamilton
Fri 10/2
6:10 pm-12:00 pm
1 stop20h 50m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$203
HamiltonSan Francisco
YHM Hamilton - SFO San Francisco
YHMSFO
Hamilton
Wed 10/21
6:10 pm-12:00 pm
1 stop20h 50m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$203
WindsorSan Francisco
YQG Windsor - SFO San Francisco
YQGSFO
Windsor
Wed 9/23
7:45 pm-10:44 am
1 stop17h 59m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$204
LondonSan Francisco
YXU London - SFO San Francisco
YXUSFO
London
Thu 12/10
5:30 am-1:10 pm
1 stop10h 40m
San Francisco
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$208
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to San Francisco
Have a flexible travel schedule? Discover the best time to fly to San Francisco from Ontario with our price prediction graph.
YXU-SFO
YQG-SFO
YYZ-SFO
YHM-SFO
YKF-SFO
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 Ontario to San Francisco
CAON-SFO
YXU-SFO
YQG-SFO
YYZ-SFO
YHM-SFO
What is the cheapest month to book a flight from Region of Ontario to San Francisco?
Currently, January is the cheapest month in which you can book a flight from Region of Ontario to San Francisco (average of $357). Flying from Region of Ontario to San Francisco in August is currently the most expensive (average of $491). 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 ON to SFO?
Find hourly flight availability from Ontario to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 8, 2026.
Unlike in the afternoon, when flights are generally more expensive, you can save up to 54% on flights from Region of Ontario to San Francisco by exploring options for tickets at noon.
Weekly flight availability from Region of Ontario to San Francisco
Explore weekly flight availability from Ontario to San Francisco. 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 September 8, 2026.
The most flights from CAON to SFO are scheduled on a Monday (27 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (5 on average).
How much does it cost to fly round-trip from Region of Ontario to San Francisco?
Airfare is below average for this route at the moment.
Region of Ontario to San Francisco flights typically cost between $326 and $473 in September.The cheapest round-trip price found within the last 5 days was $291 on WestJet (Sep 22-Oct 3).
How far ahead should I book a flight from Region of Ontario to San Francisco?
Booking 48 days in advance of your planned departure date is, on average, the best time to get cheap flights from Region of Ontario to San Francisco. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest day to fly from Region of Ontario to San Francisco?
Use this chart to determine the cheapest time to fly round-trip from Ontario to San Francisco. Price data was last updated on September 5, 2026.
Travelers seeking maximum savings on their Region of Ontario to San Francisco flight should consider departing on Friday at noon when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Related info for your journey
Find useful and relevant information for your journey from Ontario to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Francisco?
Book flights to San Francisco if you plan to visit one of these locationsSouth San Francisco
Santa Clara
Santa Cruz
Walnut Creek
Emeryville
San Bruno
Burlingame
Rancho Cordova
Roseville
Fairfield
Vallejo
Cupertino
Newark
Hayward
San Ramon
Redwood City
Manteca
San Carlos
Turlock
Davis
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.
Alternative routes
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Alternative routes for Ontario to San Francisco
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to San Francisco by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to San Francisco by cabin class
Find flights from Ontario to San Francisco, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and San Francisco flights
Browse other Ontario and San Francisco flight options. Last updated on September 8, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to San Francisco
Explore flights to San Francisco departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 8, 2026.
Ontario to San Francisco flights
Consider these flights traveling from Ontario to San Francisco.
Top 7 airlines flying from Ontario to San Francisco
Discover the top 7 airlines that operate flights from Ontario to San Francisco. 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 7,457,451 searches. Data last updated September 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$171 | Average$344 | FlexibilityNo cancel fee | On-time60% | |
| Cheapest$216 | Average$375 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$232 | Average$571 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$261 | Average$443 | FlexibilityNo cancel fee | On-time52% | |
| Cheapest$312 | Average$561 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$313 | Average$480 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$324 | Average$453 | FlexibilityNo cancel fee | On-time50% |