$94+ Cheap flights from Ontario (ONT) to Missouri
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 9/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — MCI
Jun 27 — Jul 41
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Missouri 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
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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 Missouri
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Cheapest flights from Ontario to MissouriExplore the most affordable flight options available from Ontario to Missouri. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 28, 2026.
Explore the most affordable flight options available from Ontario to Missouri. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 28, 2026.
This Frontier deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Wed 9/21:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 5/24![Frontier logo]()
$270
This CheapOair deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/83:40 pm
ONT
- MCI
1 stop22h 07m
Frontier
Wed 7/151:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Deal found 5/27![Frontier logo]()
$280
This Frontier deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/156:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Sat 7/181:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 5/27![Frontier logo]()
$284
This Frontier deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/76:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Thu 7/161:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 5/26![Frontier logo]()
$289
This Expedia deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/16:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Sun 7/54:32 pm
MCI
- ONT
1 stop25h 22m
Frontier
Deal found 5/27![Frontier logo]()
$290
This CheapOair deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/410:50 am
ONT
- MCI
1 stop24h 10m
Frontier
Tue 7/71:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Deal found 5/26![Frontier logo]()
$294
This Frontier deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/316:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Sat 9/122:17 pm
MCI
- ONT
1 stop11h 38m
Frontier
Deal found 5/23![Frontier logo]()
$298
This CheapOair deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/510:49 am
ONT
- MCI
1 stop24h 11m
Frontier
Sun 8/94:32 pm
MCI
- ONT
1 stop25h 22m
Frontier
Deal found 5/26![Frontier logo]()
$299
This CheapOair deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/72:55 pm
ONT
- MCI
1 stop20h 27m
Frontier
Sun 10/112:17 pm
MCI
- ONT
1 stop22h 26m
Frontier
Deal found 5/27![Frontier logo]()
$300
This Frontier deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/186:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Thu 7/231:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 5/27![Frontier logo]()
$303
This Frontier deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/216:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Thu 8/131:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 5/27![Frontier logo]()
$304
This Frontier deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/256:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Thu 7/21:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 5/26![Frontier logo]()
$308
Best flights from Ontario to MissouriDiscover carefully curated flight deals from Ontario to Missouri that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 28, 2026.
Discover carefully curated flight deals from Ontario to Missouri that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 28, 2026.
This United Airlines deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/15:00 am
ONT
- SGF
1 stop5h 56m
United Airlines
Wed 9/95:30 am
SGF
- ONT
2 stops8h 42m
United Airlines
Deal found 5/24![United Airlines logo]()
$334
This Booking.com deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/2310:49 am
ONT
- STL
1 stop6h 34m
Frontier
Tue 7/287:03 pm
STL
- ONT
1 stop15h 00m
Frontier
Deal found 5/24![Frontier logo]()
$338
This Southwest deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1612:45 pm
ONT
- MCI
2 stops8h 35m
Southwest
Tue 7/217:05 pm
MCI
- ONT
1 stop5h 15m
Southwest
Deal found 5/24![Southwest logo]()
$424
This Alaska Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/222:05 pm
ONT
- MCI
1 stop7h 54m
Alaska Airlines
Sat 8/15:50 pm
MCI
- ONT
1 stop8h 02m
Alaska Airlines
Deal found 5/27![Alaska Airlines logo]()
$463
This Delta deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/135:05 pm
ONT
- STL
1 stop5h 31m
Delta
Thu 9/178:00 am
STL
- ONT
1 stop6h 10m
Delta
Deal found 5/24![Delta logo]()
$471
This United Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/291:18 pm
ONT
- COU
1 stop5h 41m
United Airlines
Tue 9/13:12 pm
COU
- ONT
1 stop9h 23m
United Airlines
Deal found 5/27![United Airlines logo]()
$408
This Southwest deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/141:15 pm
ONT
- STL
2 stops7h 50m
Southwest
Thu 9/178:25 am
STL
- ONT
1 stop5h 35m
Southwest
Deal found 5/24![Southwest logo]()
$448
This United Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/191:18 pm
ONT
- COU
1 stop5h 21m
United Airlines
Wed 6/2410:48 am
COU
- ONT
2 stops8h 40m
United Airlines
Deal found 5/26![United Airlines logo]()
$414
This Frontier deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/411:43 am
ONT
- STL
1 stop5h 53m
Frontier
Tue 9/88:08 pm
STL
- ONT
1 stop5h 41m
Frontier
Deal found 5/27![Frontier logo]()
$464
This Alaska Airlines deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:02 am
ONT
- STL
1 stop10h 36m
Alaska Airlines
Mon 8/316:00 am
STL
- ONT
1 stop10h 09m
Alaska Airlines
Deal found 5/25![Alaska Airlines logo]()
$465
This Alaska Airlines deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2112:00 pm
ONT
- MCI
1 stop9h 36m
Alaska Airlines
Tue 11/243:34 pm
MCI
- ONT
1 stop9h 05m
Alaska Airlines
Deal found 5/24![Alaska Airlines logo]()
$467
This Southwest deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/137:20 am
ONT
- STL
2 stops8h 50m
Southwest
Thu 9/178:30 am
STL
- ONT
2 stops7h 30m
Southwest
Deal found 5/26![Southwest logo]()
$472
This United Airlines deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/265:45 am
ONT
- STL
1 stop6h 31m
United Airlines
Tue 6/305:10 am
STL
- ONT
2 stops9h 02m
United Airlines
Deal found 5/23![United Airlines logo]()
$449
This Kiwi.com deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/116:47 pm
ONT
- MCI
2 stops20h 34m
Frontier
Mon 6/151:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 5/27![Frontier logo]()
$511
This Southwest deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/238:35 am
ONT
- STL
2 stops8h 25m
Southwest
Sun 7/264:45 pm
STL
- ONT
2 stops9h 00m
Southwest
Deal found 5/24![Southwest logo]()
$487
This Alaska Airlines deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/72:05 pm
ONT
- STL
1 stop7h 54m
Alaska Airlines
Wed 7/225:37 pm
STL
- ONT
1 stop8h 15m
Alaska Airlines
Deal found 5/23![Alaska Airlines logo]()
$501
This United Airlines deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/251:18 pm
ONT
- COU
1 stop5h 21m
United Airlines
Wed 7/293:25 pm
COU
- ONT
1 stop9h 26m
United Airlines
Deal found 5/25![United Airlines logo]()
$469
This Gotogate deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/1510:50 am
ONT
- MCI
1 stop24h 10m
Frontier
Mon 6/291:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 5/27![Frontier logo]()
$518
This Southwest deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/3112:45 pm
ONT
- MCI
2 stops8h 40m
Southwest
Thu 8/610:20 am
MCI
- ONT
2 stops6h 45m
Southwest
Deal found 5/26![Southwest logo]()
$523
This Alaska Airlines deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/157:23 am
ONT
- MCI
1 stop7h 55m
Alaska Airlines
Sun 10/186:12 pm
MCI
- ONT
2 stops21h 07m
Alaska Airlines
Deal found 5/24![Alaska Airlines logo]()
$525
This United Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/156:00 am
ONT
- SGF
1 stop6h 16m
United Airlines
Sat 9/194:58 pm
SGF
- ONT
1 stop7h 01m
United Airlines
Deal found 5/26![United Airlines logo]()
$479
This Alaska Airlines deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/247:12 am
ONT
- SGF
2 stops10h 08m
Alaska Airlines
Mon 9/2812:47 pm
SGF
- ONT
2 stops12h 37m
Alaska Airlines
Deal found 5/23![Alaska Airlines logo]()
$529
This United Airlines deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/239:01 am
ONT
- SGF
2 stops11h 01m
United Airlines
Mon 9/283:05 pm
SGF
- ONT
1 stop8h 53m
United Airlines
Deal found 5/23![United Airlines logo]()
$485
This United Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/239:01 am
ONT
- SGF
2 stops11h 01m
United Airlines
Sat 10/33:05 pm
SGF
- ONT
1 stop8h 53m
United Airlines
Deal found 5/26![United Airlines logo]()
$485
This United Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/195:00 am
ONT
- MCI
1 stop5h 37m
United Airlines
Thu 8/2010:00 am
MCI
- ONT
2 stops12h 01m
United Airlines
Deal found 5/26![United Airlines logo]()
$487
This United Airlines deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/86:10 am
ONT
- COU
1 stop6h 40m
United Airlines
Tue 8/119:00 am
COU
- ONT
1 stop5h 50m
United Airlines
Deal found 5/24![United Airlines logo]()
$489
This United Airlines deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/295:00 am
ONT
- SGF
1 stop5h 56m
United Airlines
Tue 9/15:30 am
SGF
- ONT
1 stop9h 20m
United Airlines
Deal found 5/23![United Airlines logo]()
$507
This United Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/201:40 pm
ONT
- MCI
1 stop6h 35m
United Airlines
Tue 6/235:10 pm
MCI
- ONT
1 stop7h 41m
United Airlines
Deal found 5/27![United Airlines logo]()
$517
This United Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/191:18 pm
ONT
- MCI
1 stop5h 25m
United Airlines
Sun 6/216:00 am
MCI
- ONT
2 stops8h 12m
United Airlines
Deal found 5/27![United Airlines logo]()
$522
This United Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/225:00 am
ONT
- SGF
1 stop5h 56m
United Airlines
Sat 9/263:05 pm
SGF
- ONT
1 stop8h 53m
United Airlines
Deal found 5/26![United Airlines logo]()
$540
Last-minute flights from Ontario to MissouriDiscover last-minute flight deals from Ontario to Missouri. Data last updated May 28, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Missouri. Data last updated May 28, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/1610:50 am
ONT
- MCI
1 stop24h 10m
Frontier
Tue 8/181:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 5/25![Frontier logo]()
$280
This Expedia deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/163:34 pm
ONT
- STL
1 stop25h 17m
Frontier
Wed 6/178:08 pm
STL
- ONT
1 stop15h 57m
Frontier
Deal found 5/26![Frontier logo]()
$310
This Frontier deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/176:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Wed 6/241:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 5/27![Frontier logo]()
$310
This Frontier deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/186:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Wed 6/241:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 5/27![Frontier logo]()
$289
This Frontier deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/216:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Thu 8/131:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 5/27![Frontier logo]()
$304
This Frontier deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/226:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Wed 6/241:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 5/26![Frontier logo]()
$309
This Frontier deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/236:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Sat 6/271:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 5/25![Frontier logo]()
$284
This Frontier deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/246:00 am
ONT
- STL
1 stop11h 23m
Frontier
Mon 6/292:56 pm
STL
- ONT
1 stop6h 55m
Frontier
Deal found 5/25![Frontier logo]()
$314
This Gotogate deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/256:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Tue 6/301:45 pm
MCI
- ONT
1 stop22h 20m
Frontier
Deal found 5/24![Frontier logo]()
$299
This Frontier deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/256:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Thu 7/21:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 5/26![Frontier logo]()
$308
This Frontier deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/2710:50 am
ONT
- STL
1 stop6h 03m
Frontier
Mon 6/292:56 pm
STL
- ONT
1 stop6h 55m
Frontier
Deal found 5/24![Frontier logo]()
$318
This CheapOair deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/2710:50 am
ONT
- MCI
1 stop24h 10m
Frontier
Mon 6/291:45 pm
MCI
- ONT
1 stop22h 20m
Frontier
Deal found 5/26![Frontier logo]()
$318
One-way flights from Ontario to MissouriSearch for one-way flight options from Ontario to Missouri. Find affordable one-way fares based on user searches. Data last updated May 28, 2026.
Search for one-way flight options from Ontario to Missouri. Find affordable one-way fares based on user searches. Data last updated May 28, 2026.
This deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:00 am
ONT
- MCI
1 stop5h 22m
Frontier
Deal found 5/26![Frontier logo]()
$94
This Trip.com deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/86:00 am
ONT
- STL
1 stop11h 23m
Frontier
Deal found 5/25![Frontier logo]()
$117
This Super.com deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/216:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 5/26![Frontier logo]()
$134
This Frontier deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/16:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 5/27![Frontier logo]()
$135
This Trip.com deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:00 am
ONT
- STL
1 stop11h 23m
Frontier
Deal found 5/23![Frontier logo]()
$137
This Trip.com deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/196:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 5/26![Frontier logo]()
$140
This Trip.com deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/16:00 am
ONT
- STL
1 stop11h 23m
Frontier
Deal found 5/26![Frontier logo]()
$141
This Kissandfly.com deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/2410:50 am
ONT
- MCI
1 stop24h 10m
Frontier
Deal found 5/24![Frontier logo]()
$144
This Trip.com deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/92:55 pm
ONT
- MCI
1 stop20h 27m
Frontier
Deal found 5/26![Frontier logo]()
$145
This Trip.com deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/46:00 am
ONT
- STL
1 stop11h 23m
Frontier
Deal found 5/26![Frontier logo]()
$146
This CheapOair deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/221:38 pm
ONT
- MCI
1 stop24h 09m
Frontier
Deal found 5/27![Frontier logo]()
$146
This Super.com deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 5/27![Frontier logo]()
$148
Find flight deals from Ontario to Missouri
Keep the following information in mind while searching for Ontario to Missouri flight deals. Data was last updated May 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $270 (Frontier) |
One-way from | $94 |
Popular in | March |
Cheapest in | October |
Average price | $469 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Missouri 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 28, 2026.
Use the filters below to find and compare flights from Ontario to Missouri that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSpringfield
ONT - SGF
ONTSGF
Ontario
Tue 9/1
5:00 am-12:56 pm
1 stop5h 56m
Springfield-Branson
Wed 9/9
5:30 am-12:12 pm
2 stops8h 42m
$334
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Thu 7/23
10:49 am-7:23 pm
1 stop6h 34m
Lambert-St Louis
Tue 7/28
7:03 pm-8:03 am
1 stop15h 00m
$338
OntarioColumbia
ONT - COU
ONTCOU
Ontario
Sat 8/29
1:18 pm-8:59 pm
1 stop5h 41m
Columbia Regional
Tue 9/1
3:12 pm-10:35 pm
1 stop9h 23m
$408
OntarioColumbia
ONT - COU
ONTCOU
Ontario
Fri 6/19
1:18 pm-8:39 pm
1 stop5h 21m
Columbia Regional
Wed 6/24
10:48 am-5:28 pm
2 stops8h 40m
$414
OntarioKansas City
ONT - MCI
ONTMCI
Ontario
Thu 7/16
12:45 pm-11:20 pm
2 stops8h 35m
Kansas City
Tue 7/21
7:05 pm-10:20 pm
1 stop5h 15m
$424
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Mon 9/14
1:15 pm-11:05 pm
2 stops7h 50m
Lambert-St Louis
Thu 9/17
8:25 am-12:00 pm
1 stop5h 35m
$448
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Fri 6/26
5:45 am-2:16 pm
1 stop6h 31m
Lambert-St Louis
Tue 6/30
5:10 am-12:12 pm
2 stops9h 02m
$449
OntarioKansas City
ONT - MCI
ONTMCI
Ontario
Wed 7/22
2:05 pm-11:59 pm
1 stop7h 54m
Kansas City
Sat 8/1
5:50 pm-11:52 pm
1 stop8h 02m
$463
Quickest round-trip
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Fri 9/4
11:43 am-7:36 pm
1 stop5h 53m
Lambert-St Louis
Tue 9/8
8:08 pm-11:49 pm
1 stop5h 41m
$464
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Thu 8/27
6:02 am-6:38 pm
1 stop10h 36m
Lambert-St Louis
Mon 8/31
6:00 am-2:09 pm
1 stop10h 09m
$465
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to Missouri
Have a flexible travel schedule? Discover the best time to fly to Missouri from Ontario with our price prediction graph.
ONT-SGF
ONT-STL
ONT-MCI
ONT-COU
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 Missouri
ONT-USMO
ONT-SGF
ONT-STL
ONT-MCI
ONT-COU
What is the cheapest month to book a flight from Ontario to Missouri?
Currently, September is the cheapest month in which you can book a flight from Ontario to Missouri (average of $71). Flying from Ontario to Missouri in March is currently the most expensive (average of $252). 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 Missouri?
How far ahead should I book a flight from Ontario to Missouri?
Booking 74 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Missouri. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Reviews of airlines servicing Missouri
Get insights into the airlines that provide service to Missouri. 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 Missouri. Reviews last updated May 28, 2026.
See what other customers who have flown with Southwest,Delta, andUnited Airlines from Ontario to Missouri have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Boarding
8.1
Food
7.0
Overall
7.9
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Boarding
8.1
Food
7.0
Overall
7.9
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Boarding
8.1
Food
7.0
Overall
7.9
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Boarding
8.1
Food
7.0
Overall
7.9
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Boarding
8.1
Food
7.0
Overall
7.9
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Boarding
8.1
Food
7.0
Overall
7.9
Entertainment
7.5
Comfort
8.0
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 Missouri. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Ontario to Missouri
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Missouri by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Missouri by cabin class
Find flights from Ontario to Missouri, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Missouri flights
Browse other Ontario and Missouri flight options. Last updated on May 28, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to Missouri flights
Consider these flights traveling from Ontario to Missouri.
Top 5 airlines flying from Ontario to Missouri
Discover the top 5 airlines that operate flights from Ontario to Missouri. 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 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$98 | Average$383 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$121 | Average$240 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$246 | Average$452 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$249 | Average$462 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$259 | Average$453 | FlexibilityNo cancel fee | On-time71% |