$91+ Cheap flights from Ontario to San Antonio (ONT - SAT)
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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SAT
Jun 17 — Jun 241
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to San Antonio 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 Antonio
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Cheapest flights from Ontario to San AntonioExplore the most affordable flight options available from Ontario to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 18, 2026.
Explore the most affordable flight options available from Ontario to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 18, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 5/17. 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.
Tue 6/96:00 am
ONT
- SAT
1 stop10h 56m
Frontier
Tue 6/98:56 pm
SAT
- ONT
1 stop20h 12m
Frontier
Deal found 5/17![Frontier logo]()
$188
This Cheapflightsfares deal was found by Cheapflights users on 5/13. 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 6/103:34 pm
ONT
- SAT
1 stop26h 37m
Frontier
Wed 6/178:56 pm
SAT
- ONT
1 stop24h 55m
Frontier
Deal found 5/13![Frontier logo]()
$189
This Expedia deal was found by Cheapflights users on 5/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:00 am
ONT
- SAT
1 stop10h 54m
Frontier
Tue 8/187:51 pm
SAT
- ONT
1 stop5h 58m
Frontier
Deal found 5/13![Frontier logo]()
$190
This Cheapflightsfares deal was found by Cheapflights users on 5/13. 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 7/110:50 am
ONT
- SAT
1 stop6h 06m
Frontier
Sun 7/57:51 pm
SAT
- ONT
1 stop5h 59m
Frontier
Deal found 5/13![Frontier logo]()
$199
This Frontier deal was found by Cheapflights users on 5/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/246:00 am
ONT
- SAT
1 stop10h 56m
Frontier
Sat 6/277:51 pm
SAT
- ONT
1 stop5h 58m
Frontier
Deal found 5/13![Frontier logo]()
$200
This Booking.com deal was found by Cheapflights users on 5/13. 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.
Tue 6/163:34 pm
ONT
- SAT
1 stop26h 37m
Frontier
Tue 6/237:51 pm
SAT
- ONT
1 stop16h 14m
Frontier
Deal found 5/13![Frontier logo]()
$201
This Cheapflightsfares deal was found by Cheapflights users on 5/14. 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 6/46:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Tue 6/98:56 pm
SAT
- ONT
1 stop24h 55m
Frontier
Deal found 5/14![Frontier logo]()
$203
This Expedia deal was found by Cheapflights users on 5/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/411:58 am
ONT
- SAT
1 stop6h 13m
Frontier
Tue 7/78:59 pm
SAT
- ONT
1 stop20h 08m
Frontier
Deal found 5/17![Frontier logo]()
$204
This Cheapflightsfares deal was found by Cheapflights users on 5/15. 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.
Tue 6/303:34 pm
ONT
- SAT
1 stop26h 37m
Frontier
Mon 7/68:59 pm
SAT
- ONT
1 stop20h 08m
Frontier
Deal found 5/15![Frontier logo]()
$207
This Cheapflightsfares deal was found by Cheapflights users on 5/16. 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.
Sun 6/76:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Tue 6/98:56 pm
SAT
- ONT
1 stop20h 12m
Frontier
Deal found 5/16![Frontier logo]()
$208
This Cheapflightsfares deal was found by Cheapflights users on 5/13. 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.
Fri 7/243:40 pm
ONT
- SAT
1 stop26h 34m
Frontier
Sun 7/268:59 pm
SAT
- ONT
1 stop20h 08m
Frontier
Deal found 5/13![Frontier logo]()
$209
This Frontier deal was found by Cheapflights users on 5/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/2511:58 am
ONT
- SAT
1 stop6h 13m
Frontier
Sat 6/277:51 pm
SAT
- ONT
1 stop5h 58m
Frontier
Deal found 5/13![Frontier logo]()
$210
Best flights from Ontario to San AntonioDiscover carefully curated flight deals from Ontario to San Antonio that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 18, 2026.
Discover carefully curated flight deals from Ontario to San Antonio that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 18, 2026.
This Southwest deal was found by Cheapflights users on 5/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/194:00 pm
ONT
- SAT
2 stops7h 35m
Southwest
Sun 6/217:40 pm
SAT
- ONT
1 stop6h 25m
Southwest
Deal found 5/13![Southwest logo]()
$452
This United Airlines deal was found by Cheapflights users on 5/17. 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 8/189:15 am
ONT
- SAT
1 stop6h 28m
United Airlines
Wed 8/1912:00 pm
SAT
- ONT
2 stops10h 01m
United Airlines
Deal found 5/17![United Airlines logo]()
$474
This Southwest deal was found by Cheapflights users on 5/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/125:15 pm
ONT
- SAT
1 stop6h 00m
Southwest
Sat 6/136:10 am
SAT
- ONT
2 stops8h 35m
Southwest
Deal found 5/16![Southwest logo]()
$458
This United Airlines deal was found by Cheapflights users on 5/14. 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 8/251:18 pm
ONT
- SAT
2 stops7h 26m
United Airlines
Sat 8/299:07 am
SAT
- ONT
1 stop5h 43m
United Airlines
Deal found 5/14![United Airlines logo]()
$474
This Southwest deal was found by Cheapflights users on 5/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/235:15 am
ONT
- SAT
2 stops6h 10m
Southwest
Sun 7/266:40 pm
SAT
- ONT
2 stops7h 25m
Southwest
Deal found 5/17![Southwest logo]()
$464
This United Airlines deal was found by Cheapflights users on 5/13. 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 11/71:00 pm
ONT
- SAT
1 stop6h 07m
United Airlines
Sun 11/154:45 pm
SAT
- ONT
1 stop5h 35m
United Airlines
Deal found 5/13![United Airlines logo]()
$503
This Southwest deal was found by Cheapflights users on 5/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/185:15 am
ONT
- SAT
2 stops6h 10m
Southwest
Mon 6/225:20 am
SAT
- ONT
2 stops8h 00m
Southwest
Deal found 5/15![Southwest logo]()
$474
This Southwest deal was found by Cheapflights users on 5/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/133:00 pm
ONT
- SAT
1 stop7h 15m
Southwest
Sun 6/286:15 pm
SAT
- ONT
2 stops7h 50m
Southwest
Deal found 5/17![Southwest logo]()
$481
This Southwest deal was found by Cheapflights users on 5/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/910:05 am
ONT
- SAT
2 stops8h 35m
Southwest
Sun 10/116:00 am
SAT
- ONT
1 stop5h 00m
Southwest
Deal found 5/13![Southwest logo]()
$492
This Southwest deal was found by Cheapflights users on 5/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/296:00 pm
ONT
- SAT
1 stop4h 30m
Southwest
Sun 5/316:55 pm
SAT
- ONT
2 stops7h 10m
Southwest
Deal found 5/15![Southwest logo]()
$492
This Southwest deal was found by Cheapflights users on 5/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2810:30 am
ONT
- SAT
2 stops7h 20m
Southwest
Sun 5/316:55 pm
SAT
- ONT
2 stops7h 10m
Southwest
Deal found 5/16![Southwest logo]()
$498
Last-minute flights from Ontario to San AntonioDiscover last-minute flight deals from Ontario to San Antonio. Data last updated May 18, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to San Antonio. Data last updated May 18, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 5/13. 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.
Fri 5/296:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Wed 6/107:51 pm
SAT
- ONT
1 stop5h 58m
Frontier
Deal found 5/13![Frontier logo]()
$209
This Cheapflightsfares deal was found by Cheapflights users on 5/13. 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.
Mon 6/16:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Fri 6/127:51 pm
SAT
- ONT
1 stop5h 58m
Frontier
Deal found 5/13![Frontier logo]()
$219
This Cheapflightsfares deal was found by Cheapflights users on 5/13. 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.
Tue 6/24:39 pm
ONT
- SAT
1 stop25h 35m
Frontier
Sun 6/77:54 pm
SAT
- ONT
1 stop16h 11m
Frontier
Deal found 5/13![Frontier logo]()
$214
This Cheapflightsfares deal was found by Cheapflights users on 5/13. 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 6/36:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Mon 6/87:54 pm
SAT
- ONT
1 stop5h 55m
Frontier
Deal found 5/13![Frontier logo]()
$199
This Cheapflightsfares deal was found by Cheapflights users on 5/14. 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 6/46:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Tue 6/98:56 pm
SAT
- ONT
1 stop24h 55m
Frontier
Deal found 5/14![Frontier logo]()
$203
This Cheapflightsfares deal was found by Cheapflights users on 5/16. 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.
Sun 6/76:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Tue 6/98:56 pm
SAT
- ONT
1 stop20h 12m
Frontier
Deal found 5/16![Frontier logo]()
$208
This Cheapflightsfares deal was found by Cheapflights users on 5/17. 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.
Tue 6/96:00 am
ONT
- SAT
1 stop10h 56m
Frontier
Tue 6/98:56 pm
SAT
- ONT
1 stop20h 12m
Frontier
Deal found 5/17![Frontier logo]()
$188
This Cheapflightsfares deal was found by Cheapflights users on 5/13. 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 6/103:34 pm
ONT
- SAT
1 stop26h 37m
Frontier
Wed 6/178:56 pm
SAT
- ONT
1 stop24h 55m
Frontier
Deal found 5/13![Frontier logo]()
$189
This Frontier deal was found by Cheapflights users on 5/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/1311:58 am
ONT
- SAT
1 stop6h 13m
Frontier
Sat 6/277:51 pm
SAT
- ONT
1 stop5h 58m
Frontier
Deal found 5/17![Frontier logo]()
$218
This Frontier deal was found by Cheapflights users on 5/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/246:00 am
ONT
- SAT
1 stop10h 56m
Frontier
Sat 6/277:51 pm
SAT
- ONT
1 stop5h 58m
Frontier
Deal found 5/13![Frontier logo]()
$200
This Frontier deal was found by Cheapflights users on 5/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/2511:58 am
ONT
- SAT
1 stop6h 13m
Frontier
Sat 6/277:51 pm
SAT
- ONT
1 stop5h 58m
Frontier
Deal found 5/13![Frontier logo]()
$210
This Cheapflightsfares deal was found by Cheapflights users on 5/15. 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.
Tue 6/303:34 pm
ONT
- SAT
1 stop26h 37m
Frontier
Mon 7/68:59 pm
SAT
- ONT
1 stop20h 08m
Frontier
Deal found 5/15![Frontier logo]()
$207
One-way flights from Ontario to San AntonioSearch for one-way flight options from Ontario to San Antonio. Find affordable one-way fares based on user searches. Data last updated May 18, 2026.
Search for one-way flight options from Ontario to San Antonio. Find affordable one-way fares based on user searches. Data last updated May 18, 2026.
This Super.com deal was found by Cheapflights users on 5/13. 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.
Wed 7/110:50 am
ONT
- SAT
1 stop6h 06m
Frontier
Deal found 5/13![Frontier logo]()
$91
This Cheapflightsfares deal was found by Cheapflights users on 5/15. 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 7/221:28 pm
ONT
- SAT
1 stop4h 46m
Frontier
Deal found 5/15![Frontier logo]()
$95
This Super.com deal was found by Cheapflights users on 5/13. 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 6/163:34 pm
ONT
- SAT
1 stop26h 37m
Frontier
Deal found 5/13![Frontier logo]()
$97
This Cheapflightsfares deal was found by Cheapflights users on 5/15. 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 7/153:40 pm
ONT
- SAT
1 stop26h 34m
Frontier
Deal found 5/15![Frontier logo]()
$99
This Cheapflightsfares deal was found by Cheapflights users on 5/13. 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.
Tue 6/236:00 am
ONT
- SAT
1 stop10h 56m
Frontier
Deal found 5/13![Frontier logo]()
$100
This Super.com deal was found by Cheapflights users on 5/14. 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.
Thu 6/410:50 am
ONT
- SAT
1 stop6h 09m
Frontier
Deal found 5/14![Frontier logo]()
$101
This Cheapflightsfares deal was found by Cheapflights users on 5/14. 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 10/82:58 pm
ONT
- SAT
1 stop4h 48m
Frontier
Deal found 5/14![Frontier logo]()
$103
This Cheapflightsfares deal was found by Cheapflights users on 5/13. 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.
Sat 6/2011:58 am
ONT
- SAT
1 stop6h 13m
Frontier
Deal found 5/13![Frontier logo]()
$104
This Super.com deal was found by Cheapflights users on 5/14. 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.
Sat 7/2511:43 am
ONT
- SAT
1 stop6h 31m
Frontier
Deal found 5/14![Frontier logo]()
$105
This Booking.com deal was found by Cheapflights users on 5/16. 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.
Tue 10/276:15 am
ONT
- SAT
1 stop25h 57m
Frontier
Deal found 5/16![Frontier logo]()
$106
This Cheapflightsfares deal was found by Cheapflights users on 5/17. 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.
Sat 7/410:50 am
ONT
- SAT
1 stop6h 06m
Frontier
Deal found 5/17![Frontier logo]()
$107
This Cheapflightsfares deal was found by Cheapflights users on 5/14. 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.
Sat 6/2711:58 am
ONT
- SAT
1 stop6h 13m
Frontier
Deal found 5/14![Frontier logo]()
$108
Find flight deals from Ontario to San Antonio
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to San Antonio (SAT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $188 (Cheapflightsfares) |
One-way from | $91 (Super.com) |
Popular in | March |
Cheapest in | October |
Average price | $390 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to San Antonio 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 May 18, 2026.
Use the filters below to find and compare flights from Ontario to San Antonio that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Fri 6/19
4:00 pm-1:35 am
2 stops7h 35m
San Antonio
Sun 6/21
7:40 pm-12:05 am
1 stop6h 25m
$452
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Fri 6/12
5:15 pm-1:15 am
1 stop6h 00m
San Antonio
Sat 6/13
6:10 am-12:45 pm
2 stops8h 35m
$458
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Thu 7/23
5:15 am-1:25 pm
2 stops6h 10m
San Antonio
Sun 7/26
6:40 pm-12:05 am
2 stops7h 25m
$464
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Tue 8/18
9:15 am-5:43 pm
1 stop6h 28m
San Antonio
Wed 8/19
12:00 pm-8:01 pm
2 stops10h 01m
$474
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Tue 8/25
1:18 pm-10:44 pm
2 stops7h 26m
San Antonio
Sat 8/29
9:07 am-12:50 pm
1 stop5h 43m
$474
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Thu 6/18
5:15 am-1:25 pm
2 stops6h 10m
San Antonio
Mon 6/22
5:20 am-11:20 am
2 stops8h 00m
$474
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Sat 6/13
3:00 pm-12:15 am
1 stop7h 15m
San Antonio
Sun 6/28
6:15 pm-12:05 am
2 stops7h 50m
$481
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Fri 10/9
10:05 am-8:40 pm
2 stops8h 35m
San Antonio
Sun 10/11
6:00 am-9:00 am
1 stop5h 00m
$492
Quickest round-trip
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Fri 5/29
6:00 pm-12:30 am
1 stop4h 30m
San Antonio
Sun 5/31
6:55 pm-12:05 am
2 stops7h 10m
$492
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Thu 5/28
10:30 am-7:50 pm
2 stops7h 20m
San Antonio
Sun 5/31
6:55 pm-12:05 am
2 stops7h 10m
$498
Showing 1-10 of 23 resultsSorted by cheapest first
Compare providers for flights from Ontario to San Antonio
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to San Antonio in May.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star |
- Most accurate provider: When it comes to deals on Ontario-San Antonio flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-San Antonio flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-San Antonio flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-San Antonio flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-San Antonio flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Ontario to San Antonio
Have a flexible travel schedule? Discover the best time to fly to San Antonio from Ontario with our price prediction graph.
ONT-SAT
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 Antonio
Prices
More
How far ahead should I book a flight from Ontario to San Antonio?
The best time to book flights from Ontario to San Antonio is 63 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from Ontario to San Antonio?
Currently, October is the cheapest month in which you can book a flight from Ontario to San Antonio (average of $216). Flying from Ontario to San Antonio in March is currently the most expensive (average of $406). 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.
How much does it cost to fly round-trip from Ontario to San Antonio?
What’s the top layover airport for flights from Ontario to San Antonio?
Share of 1-stop round-trip flights from Ontario to San Antonio chosen by Cheapflights users in the past 12 months, using the same layover each way.
Phoenix (PHX) – chosen by Cheapflights users on 67% of 1-stop itineraries from Ontario to San Antonio on Cheapflights.
What’s the cheapest layover airport for flights from Ontario to San Antonio?
Average round-trip fare for 1-stop flights from Ontario to San Antonio, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Phoenix (PHX) is the most affordable 1-stop option, with an average round-trip price of $225.
What’s the fastest layover option from Ontario to San Antonio?
Shortest average travel time for 1-stop one-way flights from Ontario to San Antonio, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Phoenix (PHX) have the shortest average one-way travel time for 1-stop routes: 4h 34m.
Which airport typically offers the quickest layover for flights from Ontario to San Antonio?
Average layover duration for 1-stop one-way flights from Ontario to San Antonio, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Phoenix (PHX) offer the fastest connection on this route, with an average layover time of 0h 52m.
Reviews of airlines servicing San Antonio
Get insights into the airlines that provide service to San Antonio. 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 San Antonio. Reviews last updated May 18, 2026.
See what other customers who have flown with Southwest,United Airlines, andAmerican Airlines from Ontario to San Antonio have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Related info for your journey
Find useful and relevant information for your journey from Ontario to San Antonio. 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 Antonio?
Book flights to San Antonio if you plan to visit one of these locationsNew Braunfels
Kerrville
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Ontario and San Antonio flights
Browse other Ontario and San Antonio flight options. Last updated on May 18, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on May 18, 2026.
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Top 6 airlines flying from Ontario to San Antonio
Discover the top 6 airlines that operate flights from Ontario to San Antonio. 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 May 18, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$104 | Average$174 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$110 | Average$261 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$200 | Average$369 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$226 | Average$389 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$392 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$270 | Average$336 | FlexibilityNo cancel fee | On-time69% |