$100+ 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 6/30. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — MCI
Jul 11 — Jul 181
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 June 11, 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 June 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/223:40 pm
ONT
- MCI
1 stop22h 07m
Frontier
Tue 7/281:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 6/10![Frontier logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/153:40 pm
ONT
- MCI
1 stop22h 07m
Frontier
Wed 7/221:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 6/10![Frontier logo]()
$213
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 8/51:38 pm
ONT
- MCI
1 stop24h 09m
Frontier
Mon 8/174:32 pm
MCI
- ONT
1 stop24h 37m
Frontier
Deal found 6/10![Frontier logo]()
$224
This Kiwi.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 7/216:00 am
ONT
- MCI
1 stop29h 00m
Frontier
Tue 7/281:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Deal found 6/11![Frontier logo]()
$225
This Frontier deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 6/9![Frontier logo]()
$240
This Expedia deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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.
Thu 8/206:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Tue 8/251:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 6/9![Frontier logo]()
$242
This Expedia deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/41:38 pm
ONT
- STL
1 stop26h 27m
Frontier
Tue 8/117:03 pm
STL
- ONT
1 stop15h 00m
Frontier
Deal found 6/10![Frontier logo]()
$244
This Expedia deal was found by Cheapflights users on 6/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/125:08 pm
ONT
- MCI
1 stop20h 39m
Frontier
Sat 8/151:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Deal found 6/6![Frontier logo]()
$244
This Expedia deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/46:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Tue 8/181:45 pm
MCI
- ONT
1 stop22h 20m
Frontier
Deal found 6/10![Frontier logo]()
$245
This Booking.com deal was found by Cheapflights users on 6/6. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/710:49 am
ONT
- MCI
1 stop24h 11m
Frontier
Sat 7/111:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Deal found 6/6![Frontier logo]()
$246
This Frontier deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 8/66:00 am
ONT
- STL
1 stop11h 23m
Frontier
Wed 8/128:08 pm
STL
- ONT
1 stop5h 42m
Frontier
Deal found 6/10![Frontier logo]()
$247
This Frontier deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/64:34 pm
ONT
- STL
1 stop23h 41m
Frontier
Thu 8/137:10 pm
STL
- ONT
1 stop14h 53m
Frontier
Deal found 6/11![Frontier logo]()
$249
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 June 11, 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 June 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/223:40 pm
ONT
- MCI
1 stop22h 07m
Frontier
Tue 7/281:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 6/10![Frontier logo]()
$197
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/45:05 pm
ONT
- STL
1 stop5h 36m
Delta
Tue 8/117:45 pm
STL
- ONT
1 stop5h 49m
Delta
Deal found 6/11![Delta logo]()
$277
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/261:50 pm
ONT
- MCI
1 stop5h 20m
Southwest
Sat 8/291:10 pm
MCI
- ONT
2 stops8h 35m
Southwest
Deal found 6/8![Southwest logo]()
$307
This United Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 9/26:00 am
ONT
- MCI
2 stops8h 11m
United Airlines
Sat 9/51:43 pm
MCI
- ONT
2 stops8h 18m
United Airlines
Deal found 6/9![United Airlines logo]()
$315
This American Airlines deal was found by Cheapflights users on 6/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1212:59 pm
ONT
- MCI
2 stops9h 36m
American Airlines
Sat 8/156:20 am
MCI
- ONT
2 stops7h 43m
American Airlines
Deal found 6/6![American Airlines logo]()
$393
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 8/45:05 pm
ONT
- STL
1 stop5h 36m
Delta
Thu 8/137:45 pm
STL
- ONT
1 stop5h 49m
Delta
Deal found 6/11![Delta logo]()
$296
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/312:00 pm
ONT
- STL
2 stops9h 05m
Southwest
Tue 9/85:30 pm
STL
- ONT
1 stop6h 35m
Southwest
Deal found 6/8![Southwest logo]()
$322
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 9/95:05 pm
ONT
- STL
1 stop5h 31m
Delta
Thu 9/178:00 am
STL
- ONT
1 stop6h 10m
Delta
Deal found 6/10![Delta logo]()
$296
This Alaska Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 7/165:26 pm
ONT
- SGF
2 stops13h 25m
Alaska Airlines
Tue 7/2112:46 pm
SGF
- ONT
2 stops12h 25m
Alaska Airlines
Deal found 6/9![Alaska Airlines logo]()
$748
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/189:15 am
ONT
- STL
1 stop6h 49m
United Airlines
Wed 8/195:10 am
STL
- ONT
2 stops9h 02m
United Airlines
Deal found 6/10![United Airlines logo]()
$382
This Southwest deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 10/1311:15 am
ONT
- MCI
2 stops6h 30m
Southwest
Tue 10/201:55 pm
MCI
- ONT
2 stops10h 05m
Southwest
Deal found 6/10![Southwest logo]()
$349
This Booking.com deal was found by Cheapflights users on 6/6. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/22:55 pm
ONT
- MCI
1 stop20h 27m
Frontier
Sun 10/42:17 pm
MCI
- ONT
1 stop22h 26m
Frontier
Deal found 6/6![Frontier logo]()
$418
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 8/199:01 am
ONT
- MCI
2 stops12h 29m
United Airlines
Wed 8/263:29 pm
MCI
- ONT
1 stop6h 32m
United Airlines
Deal found 6/10![United Airlines logo]()
$393
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/315:10 pm
ONT
- STL
1 stop5h 31m
Delta
Tue 8/47:45 pm
STL
- ONT
1 stop5h 49m
Delta
Deal found 6/10![Delta logo]()
$377
This American Airlines deal was found by Cheapflights users on 6/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/32:15 pm
ONT
- COU
1 stop6h 05m
American Airlines
Sat 7/117:26 pm
COU
- ONT
1 stop6h 33m
American Airlines
Deal found 6/6![American Airlines logo]()
$479
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:15 am
ONT
- STL
1 stop6h 49m
United Airlines
Wed 8/261:36 pm
STL
- ONT
2 stops8h 25m
United Airlines
Deal found 6/8![United Airlines logo]()
$410
This Southwest deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 9/1310:10 am
ONT
- STL
2 stops7h 45m
Southwest
Thu 9/173:45 pm
STL
- ONT
1 stop6h 35m
Southwest
Deal found 6/9![Southwest logo]()
$429
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 6/10![Delta logo]()
$396
This American Airlines deal was found by Cheapflights users on 6/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/21:11 pm
ONT
- COU
2 stops7h 09m
American Airlines
Sat 7/117:26 pm
COU
- ONT
1 stop6h 33m
American Airlines
Deal found 6/6![American Airlines logo]()
$484
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 9/16:00 am
ONT
- MCI
1 stop6h 33m
United Airlines
Wed 9/210:00 am
MCI
- ONT
2 stops12h 01m
United Airlines
Deal found 6/10![United Airlines logo]()
$414
This Southwest deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 10/151:15 pm
ONT
- STL
2 stops8h 25m
Southwest
Sun 10/188:30 am
STL
- ONT
1 stop7h 10m
Southwest
Deal found 6/9![Southwest logo]()
$429
This American Airlines deal was found by Cheapflights users on 6/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/56:11 am
ONT
- COU
2 stops10h 45m
American Airlines
Sat 7/117:26 pm
COU
- ONT
1 stop6h 33m
American Airlines
Deal found 6/6![American Airlines logo]()
$484
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 9/227:00 am
ONT
- JLN
1 stop9h 46m
United Airlines
Sat 9/261:53 pm
JLN
- ONT
2 stops11h 06m
United Airlines
Deal found 6/10![United Airlines logo]()
$424
This Delta deal was found by Cheapflights users on 6/7. 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.
Wed 11/255:05 pm
ONT
- MCI
1 stop5h 16m
Delta
Mon 11/307:40 pm
MCI
- ONT
1 stop6h 08m
Delta
Deal found 6/7![Delta logo]()
$425
This American Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/222:15 pm
ONT
- COU
1 stop6h 05m
American Airlines
Tue 8/45:19 pm
COU
- ONT
1 stop8h 40m
American Airlines
Deal found 6/8![American Airlines logo]()
$494
This United Airlines deal was found by Cheapflights users on 6/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:00 am
ONT
- SGF
2 stops12h 47m
United Airlines
Wed 9/95:30 am
SGF
- ONT
2 stops8h 42m
United Airlines
Deal found 6/6![United Airlines logo]()
$439
This United Airlines deal was found by Cheapflights users on 6/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/206:05 am
ONT
- COU
1 stop6h 44m
United Airlines
Tue 6/239:14 am
COU
- ONT
1 stop5h 33m
United Airlines
Deal found 6/6![United Airlines logo]()
$444
This Delta deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/235:05 pm
ONT
- MCI
1 stop5h 16m
Delta
Sat 11/287:40 pm
MCI
- ONT
1 stop6h 08m
Delta
Deal found 6/6![Delta logo]()
$497
This United Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 7/116:10 am
ONT
- MCI
1 stop9h 26m
United Airlines
Sun 7/129:10 am
MCI
- ONT
1 stop5h 37m
United Airlines
Deal found 6/9![United Airlines logo]()
$466
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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.
Thu 9/2411:59 am
ONT
- SGF
1 stop27h 00m
Delta
Sun 9/273:19 pm
SGF
- ONT
1 stop9h 07m
Delta
Deal found 6/11![Delta logo]()
$548
Last-minute flights from Ontario to MissouriDiscover last-minute flight deals from Ontario to Missouri. Data last updated June 11, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Missouri. Data last updated June 11, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 6/306:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Wed 7/11:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 6/9![Frontier logo]()
$270
This Booking.com deal was found by Cheapflights users on 6/6. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/710:49 am
ONT
- MCI
1 stop24h 11m
Frontier
Sat 7/111:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Deal found 6/6![Frontier logo]()
$246
This Booking.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/81:38 pm
ONT
- STL
1 stop26h 37m
Frontier
Tue 7/147:03 pm
STL
- ONT
1 stop22h 11m
Frontier
Deal found 6/8![Frontier logo]()
$266
This Expedia deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/146:00 am
ONT
- STL
1 stop11h 23m
Frontier
Tue 7/217:03 pm
STL
- ONT
1 stop15h 00m
Frontier
Deal found 6/10![Frontier logo]()
$264
This Booking.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/146:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Tue 7/211:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 6/9![Frontier logo]()
$272
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/153:40 pm
ONT
- MCI
1 stop22h 07m
Frontier
Wed 7/221:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 6/10![Frontier logo]()
$213
This Frontier deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 6/11![Frontier logo]()
$257
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/153:40 pm
ONT
- STL
1 stop24h 35m
Frontier
Sun 7/197:10 pm
STL
- ONT
1 stop22h 44m
Frontier
Deal found 6/10![Frontier logo]()
$262
This Kiwi.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” 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 7/216:00 am
ONT
- MCI
1 stop29h 00m
Frontier
Tue 7/281:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Deal found 6/11![Frontier logo]()
$225
This Kiwi.com deal was found by Cheapflights users on 6/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/211:38 pm
ONT
- STL
1 stop26h 27m
Frontier
Wed 7/298:08 pm
STL
- ONT
1 stop15h 56m
Frontier
Deal found 6/6![Frontier logo]()
$265
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 7/223:40 pm
ONT
- MCI
1 stop22h 07m
Frontier
Tue 7/281:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 6/10![Frontier logo]()
$197
This Flightnetwork deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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.
Thu 7/3011:52 am
ONT
- MCI
1 stop25h 55m
Frontier
Wed 8/51:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Deal found 6/10![Frontier logo]()
$275
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 June 11, 2026.
Search for one-way flight options from Ontario to Missouri. Find affordable one-way fares based on user searches. Data last updated June 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 6/303:34 pm
ONT
- STL
1 stop25h 17m
Frontier
Deal found 6/9![Frontier logo]()
$100
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/13:34 pm
ONT
- STL
1 stop17h 44m
Frontier
Deal found 6/7![Frontier logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 6/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/46:00 am
ONT
- MCI
1 stop29h 00m
Frontier
Deal found 6/6![Frontier logo]()
$103
This Trip.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/303:40 pm
ONT
- STL
1 stop24h 35m
Frontier
Deal found 6/8![Frontier logo]()
$106
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 8/51:38 pm
ONT
- STL
1 stop26h 37m
Frontier
Deal found 6/10![Frontier logo]()
$111
This Frontier deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 8/116:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/9![Frontier logo]()
$120
This Super.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/126:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/8![Frontier logo]()
$121
This Frontier deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 8/156:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/9![Frontier logo]()
$122
This Super.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 9/21:27 pm
ONT
- MCI
1 stop21h 28m
Frontier
Deal found 6/9![Frontier logo]()
$125
This Super.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” 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 9/229:49 pm
ONT
- STL
1 stop12h 02m
Frontier
Deal found 6/10![Frontier logo]()
$126
This Trip.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/9![Frontier logo]()
$126
This Super.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/273:34 pm
ONT
- MCI
1 stop19h 21m
Frontier
Deal found 6/8![Frontier logo]()
$127
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 June 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $197 (Kiwi.com) |
One-way from | $100 (Kiwi.com) |
Popular in | March |
Cheapest in | October |
Average price | $467 |
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 June 11, 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
OntarioKansas City
ONT - MCI
ONTMCI
Ontario
Wed 7/22
3:40 pm-3:47 pm
1 stop22h 07m
Kansas City
Tue 7/28
1:45 pm-11:50 pm
1 stop12h 05m
$197
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Tue 8/4
5:05 pm-12:41 am
1 stop5h 36m
Lambert-St Louis
Tue 8/11
7:45 pm-11:34 pm
1 stop5h 49m
$277
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Tue 8/4
5:05 pm-12:41 am
1 stop5h 36m
Lambert-St Louis
Thu 8/13
7:45 pm-11:34 pm
1 stop5h 49m
$296
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Wed 9/9
5:05 pm-12:36 am
1 stop5h 31m
Lambert-St Louis
Thu 9/17
8:00 am-12:10 pm
1 stop6h 10m
$296
OntarioKansas City
ONT - MCI
ONTMCI
Ontario
Wed 8/26
1:50 pm-9:10 pm
1 stop5h 20m
Kansas City
Sat 8/29
1:10 pm-7:45 pm
2 stops8h 35m
$307
OntarioKansas City
ONT - MCI
ONTMCI
Ontario
Wed 9/2
6:00 am-4:11 pm
2 stops8h 11m
Kansas City
Sat 9/5
1:43 pm-8:01 pm
2 stops8h 18m
$315
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Thu 9/3
12:00 pm-11:05 pm
2 stops9h 05m
Lambert-St Louis
Tue 9/8
5:30 pm-10:05 pm
1 stop6h 35m
$322
OntarioKansas City
ONT - MCI
ONTMCI
Ontario
Tue 10/13
11:15 am-7:45 pm
2 stops6h 30m
Kansas City
Tue 10/20
1:55 pm-10:00 pm
2 stops10h 05m
$349
Quickest round-trip
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Fri 7/31
5:10 pm-12:41 am
1 stop5h 31m
Lambert-St Louis
Tue 8/4
7:45 pm-11:34 pm
1 stop5h 49m
$377
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Tue 8/18
9:15 am-6:04 pm
1 stop6h 49m
Lambert-St Louis
Wed 8/19
5:10 am-12:12 pm
2 stops9h 02m
$382
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, 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 76 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 June 11, 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.
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Food
7.0
Crew
8.6
Entertainment
7.5
Overall
7.9
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
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 June 11, 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 June 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$98 | Average$347 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$130 | Average$259 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$246 | Average$467 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$249 | Average$462 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$259 | Average$416 | FlexibilityNo cancel fee | On-time71% |