$105+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SAT
Jun 7 — Jun 141
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
Cheapest
Best
Last-minute
One-way
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 8, 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 8, 2026.
This CheapOair deal was found by Cheapflights users on 5/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/196:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Tue 5/267:54 pm
SAT
- ONT
1 stop16h 11m
Frontier
Deal found 5/3![Frontier logo]()
$180
This Cheapflightsfares deal was found by Cheapflights users on 5/2. 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 5/246:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Sat 5/308:59 pm
SAT
- ONT
1 stop13h 05m
Frontier
Deal found 5/2![Frontier logo]()
$194
This Cheapflightsfares deal was found by Cheapflights users on 5/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/206:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Sat 5/237:54 pm
SAT
- ONT
1 stop5h 55m
Frontier
Deal found 5/4![Frontier logo]()
$199
This Expedia deal was found by Cheapflights users on 5/3. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/196:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Sat 5/237:54 pm
SAT
- ONT
1 stop16h 11m
Frontier
Deal found 5/3![Frontier logo]()
$200
This Kiwi.com deal was found by Cheapflights users on 5/3. 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.
Wed 8/126:00 am
ONT
- SAT
1 stop10h 54m
Frontier
Sat 8/157:51 pm
SAT
- ONT
1 stop5h 59m
Frontier
Deal found 5/3![Frontier logo]()
$204
This Cheapflightsfares deal was found by Cheapflights users on 5/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Thu 5/289:09 pm
SAT
- ONT
1 stop12h 55m
Frontier
Deal found 5/4![Frontier logo]()
$213
This Cheapflightsfares deal was found by Cheapflights users on 5/5. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3011:51 am
ONT
- SAT
1 stop6h 23m
Frontier
Tue 6/28:59 pm
SAT
- ONT
1 stop24h 33m
Frontier
Deal found 5/5![Frontier logo]()
$217
This Frontier deal was found by Cheapflights users on 5/5. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/26:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Wed 6/37:54 pm
SAT
- ONT
1 stop5h 55m
Frontier
Deal found 5/5![Frontier logo]()
$218
This Frontier deal was found by Cheapflights users on 5/3. 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 Frontier 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
Sat 6/137:51 pm
SAT
- ONT
1 stop5h 58m
Frontier
Deal found 5/3![Frontier logo]()
$219
This Cheapflightsfares deal was found by Cheapflights users on 5/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Sun 5/317:54 pm
SAT
- ONT
1 stop16h 11m
Frontier
Deal found 5/4![Frontier logo]()
$220
This Frontier deal was found by Cheapflights users on 5/3. 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 Frontier 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
Sun 6/77:54 pm
SAT
- ONT
1 stop5h 55m
Frontier
Deal found 5/3![Frontier logo]()
$221
This Cheapflightsfares deal was found by Cheapflights users on 5/3. 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.
Tue 6/24:39 pm
ONT
- SAT
1 stop25h 35m
Frontier
Sat 6/67:54 pm
SAT
- ONT
1 stop16h 11m
Frontier
Deal found 5/3![Frontier logo]()
$223
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 8, 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 8, 2026.
This United Airlines deal was found by Cheapflights users on 5/5. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/301:18 pm
ONT
- SAT
1 stop5h 36m
United Airlines
Sat 6/135:57 pm
SAT
- ONT
1 stop5h 58m
United Airlines
Deal found 5/5![United Airlines logo]()
$426
This Southwest deal was found by Cheapflights users on 5/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3011:50 am
ONT
- SAT
1 stop7h 40m
Southwest
Sat 6/137:50 am
SAT
- ONT
2 stops7h 50m
Southwest
Deal found 5/5![Southwest logo]()
$431
This Delta deal was found by Cheapflights users on 5/7. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/224:57 pm
ONT
- SAT
1 stop5h 16m
Delta
Thu 6/45:55 pm
SAT
- ONT
1 stop7h 39m
Delta
Deal found 5/7![Delta logo]()
$471
This Southwest deal was found by Cheapflights users on 5/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/55:15 am
ONT
- SAT
2 stops6h 05m
Southwest
Mon 7/62:40 pm
SAT
- ONT
1 stop7h 30m
Southwest
Deal found 5/6![Southwest logo]()
$448
This United Airlines deal was found by Cheapflights users on 5/3. 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.
Tue 6/25:45 am
ONT
- SAT
1 stop7h 54m
United Airlines
Sat 6/61:39 pm
SAT
- ONT
2 stops11h 11m
United Airlines
Deal found 5/3![United Airlines logo]()
$481
This Southwest deal was found by Cheapflights users on 5/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/204:00 pm
ONT
- SAT
2 stops7h 35m
Southwest
Sat 7/255:20 pm
SAT
- ONT
2 stops6h 40m
Southwest
Deal found 5/6![Southwest logo]()
$457
This Delta deal was found by Cheapflights users on 5/7. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/1910:00 pm
ONT
- SAT
1 stop9h 52m
Delta
Mon 6/226:30 am
SAT
- ONT
1 stop7h 40m
Delta
Deal found 5/7![Delta logo]()
$503
This Southwest deal was found by Cheapflights users on 5/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/224:00 pm
ONT
- SAT
2 stops7h 35m
Southwest
Sat 6/276:10 am
SAT
- ONT
2 stops8h 35m
Southwest
Deal found 5/6![Southwest logo]()
$457
This Southwest deal was found by Cheapflights users on 5/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/212:45 pm
ONT
- SAT
1 stop5h 50m
Southwest
Sun 7/55:55 am
SAT
- ONT
2 stops7h 20m
Southwest
Deal found 5/7![Southwest logo]()
$462
This Southwest deal was found by Cheapflights users on 5/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/131:25 pm
ONT
- SAT
2 stops8h 50m
Southwest
Mon 6/225:20 am
SAT
- ONT
2 stops8h 00m
Southwest
Deal found 5/7![Southwest logo]()
$486
This Southwest deal was found by Cheapflights users on 5/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2010:30 am
ONT
- SAT
2 stops5h 45m
Southwest
Fri 6/55:20 am
SAT
- ONT
2 stops8h 00m
Southwest
Deal found 5/6![Southwest logo]()
$498
This Southwest deal was found by Cheapflights users on 5/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/2610:30 am
ONT
- SAT
2 stops5h 45m
Southwest
Sun 5/316:55 pm
SAT
- ONT
2 stops7h 10m
Southwest
Deal found 5/7![Southwest logo]()
$508
Last-minute flights from Ontario to San AntonioDiscover last-minute flight deals from Ontario to San Antonio. Data last updated May 8, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to San Antonio. Data last updated May 8, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 5/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/196:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Tue 5/267:54 pm
SAT
- ONT
1 stop16h 11m
Frontier
Deal found 5/3![Frontier logo]()
$180
This Expedia deal was found by Cheapflights users on 5/3. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/196:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Sat 5/237:54 pm
SAT
- ONT
1 stop16h 11m
Frontier
Deal found 5/3![Frontier logo]()
$200
This Cheapflightsfares deal was found by Cheapflights users on 5/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/206:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Sat 5/237:54 pm
SAT
- ONT
1 stop5h 55m
Frontier
Deal found 5/4![Frontier logo]()
$199
This Cheapflightsfares deal was found by Cheapflights users on 5/2. 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 5/246:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Sat 5/308:59 pm
SAT
- ONT
1 stop13h 05m
Frontier
Deal found 5/2![Frontier logo]()
$194
This Cheapflightsfares deal was found by Cheapflights users on 5/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Sun 5/317:54 pm
SAT
- ONT
1 stop16h 11m
Frontier
Deal found 5/4![Frontier logo]()
$220
This Cheapflightsfares deal was found by Cheapflights users on 5/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Thu 5/289:09 pm
SAT
- ONT
1 stop12h 55m
Frontier
Deal found 5/4![Frontier logo]()
$213
This Cheapflightsfares deal was found by Cheapflights users on 5/5. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3011:51 am
ONT
- SAT
1 stop6h 23m
Frontier
Tue 6/28:59 pm
SAT
- ONT
1 stop24h 33m
Frontier
Deal found 5/5![Frontier logo]()
$217
This Frontier deal was found by Cheapflights users on 5/3. 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 Frontier 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
Sun 6/77:54 pm
SAT
- ONT
1 stop5h 55m
Frontier
Deal found 5/3![Frontier logo]()
$221
This Frontier deal was found by Cheapflights users on 5/5. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/26:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Wed 6/37:54 pm
SAT
- ONT
1 stop5h 55m
Frontier
Deal found 5/5![Frontier logo]()
$218
This Cheapflightsfares deal was found by Cheapflights users on 5/3. 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.
Tue 6/24:39 pm
ONT
- SAT
1 stop25h 35m
Frontier
Sat 6/67:54 pm
SAT
- ONT
1 stop16h 11m
Frontier
Deal found 5/3![Frontier logo]()
$223
This Cheapflightsfares deal was found by Cheapflights users on 5/3. 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.
Fri 6/53:30 pm
ONT
- SAT
1 stop26h 44m
Frontier
Sat 6/137:51 pm
SAT
- ONT
1 stop5h 58m
Frontier
Deal found 5/3![Frontier logo]()
$224
This Frontier deal was found by Cheapflights users on 5/3. 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 Frontier 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
Sat 6/137:51 pm
SAT
- ONT
1 stop5h 58m
Frontier
Deal found 5/3![Frontier logo]()
$219
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 8, 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 8, 2026.
This Super.com deal was found by Cheapflights users on 5/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/196:00 am
ONT
- SAT
1 stop10h 59m
Frontier
Deal found 5/4![Frontier logo]()
$105
This Super.com deal was found by Cheapflights users on 5/6. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/310:50 am
ONT
- SAT
1 stop6h 09m
Frontier
Deal found 5/6![Frontier logo]()
$108
This Frontier deal was found by Cheapflights users on 5/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3011:51 am
ONT
- SAT
1 stop6h 23m
Frontier
Deal found 5/7![Frontier logo]()
$109
This Super.com deal was found by Cheapflights users on 5/7. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/173:34 pm
ONT
- SAT
1 stop26h 37m
Frontier
Deal found 5/7![Frontier logo]()
$113
This Frontier deal was found by Cheapflights users on 5/4. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/2310:50 am
ONT
- SAT
1 stop6h 09m
Frontier
Deal found 5/4![Frontier logo]()
$115
This Flightnetwork deal was found by Cheapflights users on 5/6. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/13:34 pm
ONT
- SAT
1 stop26h 37m
Frontier
Deal found 5/6![Frontier logo]()
$118
This Cheapflightsfares deal was found by Cheapflights users on 5/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/83:30 pm
ONT
- SAT
1 stop26h 41m
Frontier
Deal found 5/4![Frontier logo]()
$120
This Super.com deal was found by Cheapflights users on 5/5. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/1811:58 am
ONT
- SAT
1 stop6h 13m
Frontier
Deal found 5/5![Frontier logo]()
$128
This Super.com deal was found by Cheapflights users on 5/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/1010:50 am
ONT
- SAT
1 stop6h 09m
Frontier
Deal found 5/3![Frontier logo]()
$129
This Super.com deal was found by Cheapflights users on 5/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/296:00 am
ONT
- SAT
1 stop10h 56m
Frontier
Deal found 5/3![Frontier logo]()
$133
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 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $180 (CheapOair) |
One-way from | $105 (Super.com) |
Popular in | March |
Cheapest in | October |
Average price | $391 |
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 8, 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
Quickest round-trip
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Sat 5/30
1:18 pm-8:54 pm
1 stop5h 36m
San Antonio
Sat 6/13
5:57 pm-9:55 pm
1 stop5h 58m
$426
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Sat 5/30
11:50 am-9:30 pm
1 stop7h 40m
San Antonio
Sat 6/13
7:50 am-1:40 pm
2 stops7h 50m
$431
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Sun 7/5
5:15 am-1:20 pm
2 stops6h 05m
San Antonio
Mon 7/6
2:40 pm-8:10 pm
1 stop7h 30m
$448
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Mon 7/20
4:00 pm-1:35 am
2 stops7h 35m
San Antonio
Sat 7/25
5:20 pm-10:00 pm
2 stops6h 40m
$457
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Mon 6/22
4:00 pm-1:35 am
2 stops7h 35m
San Antonio
Sat 6/27
6:10 am-12:45 pm
2 stops8h 35m
$457
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Thu 7/2
12:45 pm-8:35 pm
1 stop5h 50m
San Antonio
Sun 7/5
5:55 am-11:15 am
2 stops7h 20m
$462
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Fri 5/22
4:57 pm-12:13 am
1 stop5h 16m
San Antonio
Thu 6/4
5:55 pm-11:34 pm
1 stop7h 39m
$471
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Tue 6/2
5:45 am-3:39 pm
1 stop7h 54m
San Antonio
Sat 6/6
1:39 pm-10:50 pm
2 stops11h 11m
$481
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Sat 6/13
1:25 pm-12:15 am
2 stops8h 50m
San Antonio
Mon 6/22
5:20 am-11:20 am
2 stops8h 00m
$486
OntarioSan Antonio
ONT - SAT
ONTSAT
Ontario
Wed 5/20
10:30 am-6:15 pm
2 stops5h 45m
San Antonio
Fri 6/5
5:20 am-11:20 am
2 stops8h 00m
$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 $228). 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 8, 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.
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Entertainment
7.5
Crew
8.6
Comfort
8.0
Food
7.0
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
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
Complete your trip
Flights by cabin class
Other flight options
Other flights from Ontario
Popular flights
San Antonio flight routes
Alternative routes for Ontario to San Antonio
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to San Antonio by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to San Antonio by cabin class
Find flights from Ontario to San Antonio, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and San Antonio flights
Browse other Ontario and San Antonio flight options. Last updated on May 8, 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 8, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to San Antonio
Explore flights to San Antonio departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on May 8, 2026.
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 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$104 | Average$174 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$110 | Average$244 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$200 | Average$369 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$236 | Average$388 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$389 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$270 | Average$336 | FlexibilityNo cancel fee | On-time69% |