$80+ 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 5/26. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STL
Apr 28 — May 51
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Missouri with Cheapflights
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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 March 29, 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 March 29, 2026.
This Expedia deal was found by Cheapflights users on 3/24. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/175:33 pm
ONT
- STL
1 stop23h 59m
Frontier
Fri 4/249:58 pm
STL
- ONT
1 stop22h 51m
Frontier
Deal found 3/24![Frontier logo]()
$160
This Frontier deal was found by Cheapflights users on 3/27. 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 5/66:00 am
ONT
- MCI
1 stop5h 49m
Frontier
Sat 5/92:34 pm
MCI
- ONT
1 stop11h 15m
Frontier
Deal found 3/27![Frontier logo]()
$160
This Frontier deal was found by Cheapflights users on 3/24. 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.
Mon 5/48:59 pm
ONT
- STL
1 stop19h 07m
Frontier
Mon 5/119:18 pm
STL
- ONT
1 stop24h 14m
Frontier
Deal found 3/24![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:00 am
ONT
- MCI
1 stop5h 49m
Frontier
Tue 6/91:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 3/27![Frontier logo]()
$164
This Booking.com deal was found by Cheapflights users on 3/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/2311:47 am
ONT
- STL
1 stop7h 13m
Frontier
Sun 4/269:55 pm
STL
- ONT
1 stop12h 29m
Frontier
Deal found 3/25![Frontier logo]()
$167
This CheapOair deal was found by Cheapflights users on 3/27. 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 5/64:39 pm
ONT
- STL
1 stop16h 42m
Frontier
Fri 5/89:18 pm
STL
- ONT
1 stop19h 51m
Frontier
Deal found 3/27![Frontier logo]()
$171
This Booking.com deal was found by Cheapflights users on 3/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:44 pm
ONT
- STL
1 stop23h 16m
Frontier
Mon 4/279:55 pm
STL
- ONT
1 stop14h 49m
Frontier
Deal found 3/25![Frontier logo]()
$172
This Frontier deal was found by Cheapflights users on 3/26. 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.
Fri 5/86:00 am
ONT
- STL
1 stop11h 23m
Frontier
Sat 5/98:08 pm
STL
- ONT
1 stop5h 41m
Frontier
Deal found 3/26![Frontier logo]()
$185
This Frontier deal was found by Cheapflights users on 3/24. 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 5/212:59 am
ONT
- MCI
1 stop10h 31m
Frontier
Wed 5/62:34 pm
MCI
- ONT
1 stop11h 15m
Frontier
Deal found 3/24![Frontier logo]()
$185
This Booking.com deal was found by Cheapflights users on 3/24. 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.
Wed 4/297:44 pm
ONT
- STL
1 stop23h 16m
Frontier
Mon 5/49:55 pm
STL
- ONT
1 stop23h 37m
Frontier
Deal found 3/24![Frontier logo]()
$187
This Booking.com deal was found by Cheapflights users on 3/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/48:59 pm
ONT
- STL
1 stop19h 07m
Frontier
Thu 5/78:08 pm
STL
- ONT
1 stop5h 41m
Frontier
Deal found 3/25![Frontier logo]()
$192
This CheapOair deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” 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.
Fri 5/18:20 pm
ONT
- STL
1 stop17h 01m
Frontier
Mon 5/48:17 pm
STL
- ONT
1 stop15h 48m
Frontier
Deal found 3/28![Frontier logo]()
$196
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 March 29, 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 March 29, 2026.
This United Airlines deal was found by Cheapflights users on 3/27. 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.
Wed 5/275:45 am
ONT
- SGF
1 stop6h 33m
United Airlines
Sat 6/64:59 pm
SGF
- ONT
1 stop6h 56m
United Airlines
Deal found 3/27![United Airlines logo]()
$335
This Delta deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/286:00 am
ONT
- STL
1 stop5h 23m
Delta
Thu 4/307:00 am
STL
- ONT
1 stop7h 14m
Delta
Deal found 3/26![Delta logo]()
$369
This CheapOair deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” 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.
Thu 5/144:04 pm
ONT
- STL
1 stop26h 19m
Frontier
Sun 5/1712:16 pm
STL
- ONT
1 stop21h 33m
Frontier
Deal found 3/28![Frontier logo]()
$376
This American Airlines deal was found by Cheapflights users on 3/24. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/810:59 am
ONT
- COU
1 stop6h 14m
American Airlines
Sun 4/127:43 pm
COU
- ONT
1 stop6h 03m
American Airlines
Deal found 3/24![American Airlines logo]()
$388
This Alaska Airlines deal was found by Cheapflights users on 3/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/267:00 am
ONT
- MCI
1 stop7h 17m
Alaska Airlines
Wed 4/297:00 am
MCI
- ONT
1 stop9h 32m
Alaska Airlines
Deal found 3/26![Alaska Airlines logo]()
$451
This Southwest deal was found by Cheapflights users on 3/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/48:35 am
ONT
- STL
2 stops8h 25m
Southwest
Sun 6/74:45 pm
STL
- ONT
2 stops8h 55m
Southwest
Deal found 3/27![Southwest logo]()
$470
This United Airlines deal was found by Cheapflights users on 3/27. 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.
Wed 4/226:49 pm
ONT
- COU
2 stops14h 06m
United Airlines
Sat 4/253:23 pm
COU
- ONT
1 stop9h 08m
United Airlines
Deal found 3/27![United Airlines logo]()
$344
This Delta deal was found by Cheapflights users on 3/24. 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.
Mon 4/205:05 pm
ONT
- MCI
1 stop5h 33m
Delta
Tue 4/285:40 am
MCI
- ONT
1 stop7h 56m
Delta
Deal found 3/24![Delta logo]()
$373
This American Airlines deal was found by Cheapflights users on 3/25. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/12:08 pm
ONT
- COU
1 stop6h 45m
American Airlines
Mon 5/45:21 pm
COU
- ONT
1 stop8h 25m
American Airlines
Deal found 3/25![American Airlines logo]()
$398
This Delta deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2010:15 pm
ONT
- STL
1 stop8h 15m
Delta
Sat 4/256:00 am
STL
- ONT
1 stop7h 36m
Delta
Deal found 3/26![Delta logo]()
$376
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/17:03 pm
ONT
- COU
2 stops13h 52m
United Airlines
Mon 5/49:00 am
COU
- ONT
1 stop5h 38m
United Airlines
Deal found 3/25![United Airlines logo]()
$394
This Alaska Airlines deal was found by Cheapflights users on 3/24. 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.
Fri 4/247:00 am
ONT
- MCI
1 stop7h 17m
Alaska Airlines
Sun 4/265:11 pm
MCI
- ONT
1 stop8h 37m
Alaska Airlines
Deal found 3/24![Alaska Airlines logo]()
$455
This Southwest deal was found by Cheapflights users on 3/24. 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.
Fri 4/179:25 am
ONT
- STL
2 stops9h 30m
Southwest
Fri 4/248:25 am
STL
- ONT
2 stops8h 35m
Southwest
Deal found 3/24![Southwest logo]()
$475
This United Airlines deal was found by Cheapflights users on 3/24. 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.
Thu 5/285:00 am
ONT
- SGF
1 stop5h 52m
United Airlines
Thu 6/411:25 am
SGF
- ONT
1 stop8h 03m
United Airlines
Deal found 3/24![United Airlines logo]()
$408
This Alaska Airlines deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” 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 4/227:00 am
ONT
- MCI
1 stop7h 17m
Alaska Airlines
Sun 4/267:00 am
MCI
- ONT
1 stop9h 32m
Alaska Airlines
Deal found 3/28![Alaska Airlines logo]()
$458
This Southwest deal was found by Cheapflights users on 3/24. 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.
Wed 4/88:05 am
ONT
- STL
2 stops7h 50m
Southwest
Mon 4/203:50 pm
STL
- ONT
2 stops9h 15m
Southwest
Deal found 3/24![Southwest logo]()
$475
This Delta deal was found by Cheapflights users on 3/29. Clicking the “Pick Dates” 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.
Mon 5/111:35 pm
ONT
- MCI
1 stop7h 35m
Delta
Sun 5/176:40 am
MCI
- ONT
1 stop7h 39m
Delta
Deal found 3/29![Delta logo]()
$436
This United Airlines deal was found by Cheapflights users on 3/24. 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.
Wed 5/65:00 am
ONT
- MCI
1 stop5h 43m
United Airlines
Sat 5/98:49 am
MCI
- ONT
2 stops11h 03m
United Airlines
Deal found 3/24![United Airlines logo]()
$411
This Alaska Airlines deal was found by Cheapflights users on 3/24. 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.
Wed 6/2412:02 pm
ONT
- MCI
1 stop9h 57m
Alaska Airlines
Fri 6/265:50 pm
MCI
- ONT
1 stop8h 04m
Alaska Airlines
Deal found 3/24![Alaska Airlines logo]()
$485
This Delta deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” 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.
Wed 4/812:57 pm
ONT
- SGF
1 stop6h 46m
Delta
Sat 4/116:00 am
SGF
- ONT
1 stop7h 47m
Delta
Deal found 3/28![Delta logo]()
$474
This United Airlines deal was found by Cheapflights users on 3/25. 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.
Mon 4/276:49 pm
ONT
- STL
1 stop9h 01m
United Airlines
Tue 4/284:49 pm
STL
- ONT
1 stop7h 01m
United Airlines
Deal found 3/25![United Airlines logo]()
$437
This United Airlines deal was found by Cheapflights users on 3/24. 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.
Wed 7/155:45 am
ONT
- SGF
1 stop6h 33m
United Airlines
Thu 7/304:59 pm
SGF
- ONT
1 stop6h 56m
United Airlines
Deal found 3/24![United Airlines logo]()
$438
This United Airlines deal was found by Cheapflights users on 3/25. 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.
Wed 4/221:34 pm
ONT
- STL
1 stop5h 20m
United Airlines
Wed 4/298:54 am
STL
- ONT
2 stops10h 53m
United Airlines
Deal found 3/25![United Airlines logo]()
$467
This United Airlines deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” 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 4/296:05 am
ONT
- SGF
1 stop8h 22m
United Airlines
Mon 5/44:50 pm
SGF
- ONT
1 stop7h 08m
United Airlines
Deal found 3/28![United Airlines logo]()
$469
This United Airlines deal was found by Cheapflights users on 3/24. 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.
Fri 5/17:03 pm
ONT
- MCI
2 stops11h 38m
United Airlines
Sat 5/25:17 pm
MCI
- ONT
1 stop5h 19m
United Airlines
Deal found 3/24![United Airlines logo]()
$470
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/176:45 pm
ONT
- STL
1 stop9h 05m
United Airlines
Tue 4/218:54 am
STL
- ONT
2 stops11h 08m
United Airlines
Deal found 3/25![United Airlines logo]()
$478
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/91:34 pm
ONT
- COU
2 stops8h 59m
United Airlines
Mon 4/133:23 pm
COU
- ONT
1 stop9h 08m
United Airlines
Deal found 3/25![United Airlines logo]()
$484
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/241:43 pm
ONT
- COU
2 stops8h 50m
United Airlines
Fri 5/13:10 pm
COU
- ONT
1 stop9h 25m
United Airlines
Deal found 3/25![United Airlines logo]()
$484
This United Airlines deal was found by Cheapflights users on 3/25. 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.
Sun 6/215:45 am
ONT
- SGF
1 stop8h 35m
United Airlines
Mon 6/293:07 pm
SGF
- ONT
1 stop9h 44m
United Airlines
Deal found 3/25![United Airlines logo]()
$487
This United Airlines deal was found by Cheapflights users on 3/26. 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.
Sat 4/111:34 pm
ONT
- SGF
1 stop5h 27m
United Airlines
Wed 4/153:10 pm
SGF
- ONT
1 stop9h 21m
United Airlines
Deal found 3/26![United Airlines logo]()
$489
Last-minute flights from Ontario to MissouriDiscover last-minute flight deals from Ontario to Missouri. Data last updated March 29, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Missouri. Data last updated March 29, 2026 and is based on user searches.
This Booking.com deal was found by Cheapflights users on 3/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/910:27 pm
ONT
- STL
1 stop11h 00m
Frontier
Sun 4/121:14 pm
STL
- ONT
1 stop20h 50m
Frontier
Deal found 3/25![Frontier logo]()
$207
This Expedia deal was found by Cheapflights users on 3/27. 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.
Fri 4/106:20 am
ONT
- STL
1 stop25h 28m
Frontier
Mon 4/1312:22 pm
STL
- ONT
1 stop9h 45m
Frontier
Deal found 3/27![Frontier logo]()
$200
This CheapOair deal was found by Cheapflights users on 3/27. 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.
Fri 4/106:20 am
ONT
- STL
1 stop25h 28m
Frontier
Sun 4/121:14 pm
STL
- ONT
1 stop20h 50m
Frontier
Deal found 3/27![Frontier logo]()
$205
This Frontier deal was found by Cheapflights users on 3/25. 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 4/1512:59 am
ONT
- MCI
1 stop10h 31m
Frontier
Sat 4/182:51 pm
MCI
- ONT
1 stop11h 04m
Frontier
Deal found 3/25![Frontier logo]()
$185
This Frontier deal was found by Cheapflights users on 3/25. 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.
Thu 4/1612:59 am
ONT
- MCI
1 stop10h 31m
Frontier
Sat 4/252:51 pm
MCI
- ONT
1 stop11h 04m
Frontier
Deal found 3/25![Frontier logo]()
$205
This Expedia deal was found by Cheapflights users on 3/24. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/175:33 pm
ONT
- STL
1 stop23h 59m
Frontier
Fri 4/249:58 pm
STL
- ONT
1 stop22h 51m
Frontier
Deal found 3/24![Frontier logo]()
$160
This Frontier deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” 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 4/1712:59 am
ONT
- MCI
1 stop11h 07m
Frontier
Sat 4/252:51 pm
MCI
- ONT
1 stop11h 04m
Frontier
Deal found 3/28![Frontier logo]()
$206
This Booking.com deal was found by Cheapflights users on 3/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:44 pm
ONT
- STL
1 stop23h 16m
Frontier
Mon 4/279:55 pm
STL
- ONT
1 stop14h 49m
Frontier
Deal found 3/25![Frontier logo]()
$172
This Booking.com deal was found by Cheapflights users on 3/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/2311:47 am
ONT
- STL
1 stop7h 13m
Frontier
Sun 4/269:55 pm
STL
- ONT
1 stop12h 29m
Frontier
Deal found 3/25![Frontier logo]()
$167
This CheapOair deal was found by Cheapflights users on 3/27. 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.
Thu 4/235:33 pm
ONT
- STL
1 stop23h 48m
Frontier
Mon 4/279:55 pm
STL
- ONT
1 stop22h 54m
Frontier
Deal found 3/27![Frontier logo]()
$196
This CheapOair deal was found by Cheapflights users on 3/26. 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.
Fri 4/249:59 pm
ONT
- STL
1 stop15h 22m
Frontier
Sun 4/269:55 pm
STL
- ONT
1 stop12h 29m
Frontier
Deal found 3/26![Frontier logo]()
$171
This Booking.com deal was found by Cheapflights users on 3/24. 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.
Wed 4/297:44 pm
ONT
- STL
1 stop23h 16m
Frontier
Mon 5/49:55 pm
STL
- ONT
1 stop23h 37m
Frontier
Deal found 3/24![Frontier logo]()
$187
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 March 29, 2026.
Search for one-way flight options from Ontario to Missouri. Find affordable one-way fares based on user searches. Data last updated March 29, 2026.
This Frontier deal was found by Cheapflights users on 3/26. 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 5/266:00 am
ONT
- MCI
1 stop5h 49m
Frontier
Deal found 3/26![Frontier logo]()
$80
This Frontier deal was found by Cheapflights users on 3/25. 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.
Mon 5/116:00 am
ONT
- STL
1 stop11h 23m
Frontier
Deal found 3/25![Frontier logo]()
$86
This Booking.com deal was found by Cheapflights users on 3/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1512:59 am
ONT
- MCI
1 stop10h 31m
Frontier
Deal found 3/25![Frontier logo]()
$86
This Trip.com deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/2412:59 am
ONT
- STL
1 stop16h 33m
Frontier
Deal found 3/28![Frontier logo]()
$91
This CheapOair deal was found by Cheapflights users on 3/24. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/175:33 pm
ONT
- STL
1 stop23h 59m
Frontier
Deal found 3/24![Frontier logo]()
$92
This CheapOair deal was found by Cheapflights users on 3/24. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/175:33 pm
ONT
- MCI
1 stop18h 33m
Frontier
Deal found 3/24![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/26:00 am
ONT
- STL
1 stop11h 23m
Frontier
Deal found 3/25![Frontier logo]()
$96
This Booking.com deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” 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 4/1611:47 am
ONT
- STL
1 stop7h 13m
Frontier
Deal found 3/28![Frontier logo]()
$100
This Super.com deal was found by Cheapflights users on 3/25. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/910:27 pm
ONT
- STL
1 stop11h 00m
Frontier
Deal found 3/25![Frontier logo]()
$104
This Super.com deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” 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 4/157:44 pm
ONT
- STL
1 stop23h 16m
Frontier
Deal found 3/28![Frontier logo]()
$105
This Frontier deal was found by Cheapflights users on 3/25. 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 5/136:00 am
ONT
- MCI
1 stop5h 49m
Frontier
Deal found 3/25![Frontier logo]()
$105
This Super.com deal was found by Cheapflights users on 3/23. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/249:59 pm
ONT
- STL
1 stop15h 22m
Frontier
Deal found 3/23![Frontier logo]()
$110
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 March 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $160 (Expedia) |
One-way from | $80 (Frontier) |
Popular in | March |
Cheapest in | October |
Average price | $483 |
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 March 29, 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
Wed 5/27
5:45 am-2:18 pm
1 stop6h 33m
Springfield-Branson
Sat 6/6
4:59 pm-9:55 pm
1 stop6h 56m
$335
OntarioColumbia
ONT - COU
ONTCOU
Ontario
Wed 4/22
6:49 pm-10:55 am
2 stops14h 06m
Columbia Regional
Sat 4/25
3:23 pm-10:31 pm
1 stop9h 08m
$344
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Tue 4/28
6:00 am-1:23 pm
1 stop5h 23m
Lambert-St Louis
Thu 4/30
7:00 am-12:14 pm
1 stop7h 14m
$369
OntarioKansas City
ONT - MCI
ONTMCI
Ontario
Mon 4/20
5:05 pm-12:38 am
1 stop5h 33m
Kansas City
Tue 4/28
5:40 am-11:36 am
1 stop7h 56m
$373
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Thu 5/14
4:04 pm-8:23 pm
1 stop26h 19m
Lambert-St Louis
Sun 5/17
12:16 pm-7:49 am
1 stop21h 33m
$376
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Mon 4/20
10:15 pm-8:30 am
1 stop8h 15m
Lambert-St Louis
Sat 4/25
6:00 am-11:36 am
1 stop7h 36m
$376
Quickest round-trip
OntarioColumbia
ONT - COU
ONTCOU
Ontario
Wed 4/8
10:59 am-7:13 pm
1 stop6h 14m
Columbia Regional
Sun 4/12
7:43 pm-11:46 pm
1 stop6h 03m
$388
OntarioColumbia
ONT - COU
ONTCOU
Ontario
Fri 5/1
7:03 pm-10:55 am
2 stops13h 52m
Columbia Regional
Mon 5/4
9:00 am-12:38 pm
1 stop5h 38m
$394
OntarioColumbia
ONT - COU
ONTCOU
Ontario
Fri 5/1
2:08 pm-10:53 pm
1 stop6h 45m
Columbia Regional
Mon 5/4
5:21 pm-11:46 pm
1 stop8h 25m
$398
OntarioSpringfield
ONT - SGF
ONTSGF
Ontario
Thu 5/28
5:00 am-12:52 pm
1 stop5h 52m
Springfield-Branson
Thu 6/4
11:25 am-5:28 pm
1 stop8h 03m
$408
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-STL
ONT-MCI
ONT-SGF
ONT-COU
ONT-JLN
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-STL
ONT-MCI
ONT-SGF
ONT-COU
What is the cheapest month to book a flight from Ontario to Missouri?
Currently, June is the cheapest month in which you can book a flight from Ontario to Missouri (average of $60). Flying from Ontario to Missouri in February is currently the most expensive (average of $158). 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?
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 March 29, 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.
Overall
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Comfort
8.0
Entertainment
7.5
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
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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 March 29, 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 March 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$98 | Average$364 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$115 | Average$222 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$236 | Average$474 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$247 | Average$430 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$268 | Average$454 | FlexibilityNo cancel fee | On-time71% |