$120+ 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 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — MCI
Aug 10 — Aug 171
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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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 July 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 July 11, 2026.
This Frontier deal was found by Cheapflights users on 7/9. 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
Sat 8/151:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 7/9![Frontier logo]()
$244
This Frontier deal was found by Cheapflights users on 7/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:00 am
ONT
- MCI
1 stop4h 53m
Frontier
Sat 8/291:38 pm
MCI
- ONT
1 stop12h 12m
Frontier
Deal found 7/8![Frontier logo]()
$245
This Frontier deal was found by Cheapflights users on 7/10. 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.
Tue 9/226:00 am
ONT
- MCI
1 stop5h 22m
Frontier
Sat 10/102:17 pm
MCI
- ONT
1 stop11h 38m
Frontier
Deal found 7/10![Frontier logo]()
$246
This Frontier deal was found by Cheapflights users on 7/8. 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 Frontier 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 8/111:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 7/8![Frontier logo]()
$247
This American Airlines deal was found by Cheapflights users on 7/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/292:43 pm
ONT
- MCI
1 stop6h 07m
American Airlines
Mon 8/315:30 am
MCI
- ONT
1 stop6h 04m
American Airlines
Deal found 7/9![American Airlines logo]()
$249
This Southwest deal was found by Cheapflights users on 7/10. 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.
Sat 8/2910:35 am
ONT
- MCI
2 stops7h 55m
Southwest
Tue 9/112:35 pm
MCI
- ONT
1 stop5h 30m
Southwest
Deal found 7/10![Southwest logo]()
$250
This United Airlines deal was found by Cheapflights users on 7/9. 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 8/81:50 pm
ONT
- MCI
1 stop6h 41m
United Airlines
Sat 8/2211:22 am
MCI
- ONT
2 stops10h 39m
United Airlines
Deal found 7/9![United Airlines logo]()
$254
This Jettzy deal was found by Cheapflights users on 7/10. 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 Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/232:58 pm
ONT
- MCI
1 stop19h 57m
Frontier
Wed 10/72:17 pm
MCI
- ONT
1 stop22h 26m
Frontier
Deal found 7/10![Frontier logo]()
$255
This Delta deal was found by Cheapflights users on 7/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/215:15 pm
ONT
- MCI
1 stop5h 00m
Delta
Thu 9/247:00 am
MCI
- ONT
1 stop7h 14m
Delta
Deal found 7/8![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 7/9. 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 8/295:00 am
ONT
- MCI
2 stops10h 30m
United Airlines
Wed 9/21:43 pm
MCI
- ONT
2 stops8h 18m
United Airlines
Deal found 7/9![United Airlines logo]()
$259
This Frontier deal was found by Cheapflights users on 7/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/296:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Tue 8/41:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 7/6![Frontier logo]()
$260
This Kiwi.com deal was found by Cheapflights users on 7/10. 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.
Tue 8/46:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Sun 8/94:32 pm
MCI
- ONT
1 stop17h 31m
Frontier
Deal found 7/10![Frontier logo]()
$261
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 July 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 July 11, 2026.
This United Airlines deal was found by Cheapflights users on 7/9. 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.
Tue 8/255:00 am
ONT
- MCI
1 stop5h 37m
United Airlines
Sat 8/293:29 pm
MCI
- ONT
1 stop6h 32m
United Airlines
Deal found 7/9![United Airlines logo]()
$249
This Southwest deal was found by Cheapflights users on 7/10. 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.
Sat 8/2910:35 am
ONT
- MCI
2 stops7h 55m
Southwest
Tue 9/112:35 pm
MCI
- ONT
1 stop5h 30m
Southwest
Deal found 7/10![Southwest logo]()
$250
This Delta deal was found by Cheapflights users on 7/9. 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 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
Mon 8/107:45 pm
STL
- ONT
1 stop5h 49m
Delta
Deal found 7/9![Delta logo]()
$277
This Alaska Airlines deal was found by Cheapflights users on 7/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/242:13 pm
ONT
- MCI
1 stop7h 46m
Alaska Airlines
Mon 10/266:13 am
MCI
- ONT
1 stop9h 08m
Alaska Airlines
Deal found 7/10![Alaska Airlines logo]()
$299
This Booking.com deal was found by Cheapflights users on 7/6. 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.
Thu 10/19:12 pm
ONT
- MCI
1 stop13h 43m
Frontier
Sun 10/42:17 pm
MCI
- ONT
1 stop22h 26m
Frontier
Deal found 7/6![Frontier logo]()
$314
This American Airlines deal was found by Cheapflights users on 7/8. 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.
Fri 7/241:11 pm
ONT
- COU
2 stops7h 09m
American Airlines
Sun 7/267:26 pm
COU
- ONT
1 stop6h 33m
American Airlines
Deal found 7/8![American Airlines logo]()
$394
This Southwest deal was found by Cheapflights users on 7/8. 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.
Tue 8/117:25 am
ONT
- STL
1 stop7h 20m
Southwest
Tue 8/257:00 am
STL
- ONT
1 stop5h 15m
Southwest
Deal found 7/8![Southwest logo]()
$262
This Delta deal was found by Cheapflights users on 7/9. 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 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
Sat 8/85:00 pm
STL
- ONT
1 stop7h 23m
Delta
Deal found 7/9![Delta logo]()
$277
This Southwest deal was found by Cheapflights users on 7/9. 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.
Wed 9/92:10 pm
ONT
- STL
1 stop6h 35m
Southwest
Wed 9/165:35 am
STL
- ONT
1 stop5h 20m
Southwest
Deal found 7/9![Southwest logo]()
$262
This Delta deal was found by Cheapflights users on 7/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/291:06 pm
ONT
- STL
1 stop5h 54m
Delta
Sat 9/55:00 pm
STL
- ONT
1 stop7h 23m
Delta
Deal found 7/9![Delta logo]()
$277
This Southwest deal was found by Cheapflights users on 7/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/117:25 am
ONT
- STL
1 stop7h 20m
Southwest
Tue 8/1811:55 am
STL
- ONT
2 stops10h 10m
Southwest
Deal found 7/6![Southwest logo]()
$267
This United Airlines deal was found by Cheapflights users on 7/10. 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.
Sat 10/245:00 am
ONT
- MCI
1 stop5h 42m
United Airlines
Mon 10/265:57 pm
MCI
- ONT
1 stop6h 56m
United Airlines
Deal found 7/10![United Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 7/10. 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 9/255:15 pm
ONT
- MCI
1 stop5h 00m
Delta
Tue 10/66:05 pm
MCI
- ONT
1 stop7h 41m
Delta
Deal found 7/10![Delta logo]()
$286
This Southwest deal was found by Cheapflights users on 7/10. 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.
Mon 8/315:15 am
ONT
- STL
2 stops10h 05m
Southwest
Mon 10/195:05 am
STL
- ONT
1 stop6h 20m
Southwest
Deal found 7/10![Southwest logo]()
$268
This United Airlines deal was found by Cheapflights users on 7/10. 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.
Sat 9/268:03 am
ONT
- MCI
1 stop6h 29m
United Airlines
Tue 10/61:48 pm
MCI
- ONT
2 stops8h 43m
United Airlines
Deal found 7/10![United Airlines logo]()
$344
This Alaska Airlines deal was found by Cheapflights users on 7/7. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/112:00 pm
ONT
- MCI
1 stop9h 59m
Alaska Airlines
Wed 9/167:00 am
MCI
- ONT
1 stop9h 16m
Alaska Airlines
Deal found 7/7![Alaska Airlines logo]()
$383
This American Airlines deal was found by Cheapflights users on 7/7. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/221:11 pm
ONT
- COU
2 stops7h 09m
American Airlines
Sun 7/267:26 pm
COU
- ONT
1 stop6h 33m
American Airlines
Deal found 7/7![American Airlines logo]()
$394
This Delta deal was found by Cheapflights users on 7/9. 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 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 8/67:45 pm
STL
- ONT
1 stop5h 49m
Delta
Deal found 7/9![Delta logo]()
$304
This Southwest deal was found by Cheapflights users on 7/10. 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.
Fri 8/711:55 pm
ONT
- MCI
1 stop7h 20m
Southwest
Mon 8/107:00 pm
MCI
- ONT
1 stop4h 45m
Southwest
Deal found 7/10![Southwest logo]()
$282
This United Airlines deal was found by Cheapflights users on 7/6. 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.
Thu 8/271:18 pm
ONT
- SGF
1 stop5h 29m
United Airlines
Sun 8/305:30 am
SGF
- ONT
2 stops8h 42m
United Airlines
Deal found 7/6![United Airlines logo]()
$372
This Southwest deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/62:40 pm
ONT
- STL
1 stop7h 10m
Southwest
Thu 8/136:25 pm
STL
- ONT
1 stop5h 20m
Southwest
Deal found 7/7![Southwest logo]()
$306
This United Airlines deal was found by Cheapflights users on 7/10. 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 9/298:03 am
ONT
- MCI
1 stop6h 29m
United Airlines
Wed 9/301:07 pm
MCI
- ONT
2 stops11h 52m
United Airlines
Deal found 7/10![United Airlines logo]()
$385
This United Airlines deal was found by Cheapflights users on 7/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/205:00 am
ONT
- SGF
1 stop5h 56m
United Airlines
Thu 8/273:05 pm
SGF
- ONT
1 stop8h 54m
United Airlines
Deal found 7/7![United Airlines logo]()
$389
This KAYAK deal was found by Cheapflights users on 7/9. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/96:00 am
ONT
- SGF
1 stop5h 56m
American Airlines
Thu 8/131:13 pm
SGF
- ONT
1 stop7h 34m
American Airlines
Deal found 7/9![American Airlines logo]()
$580
This Southwest deal was found by Cheapflights users on 7/8. 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.
Sat 8/810:15 am
ONT
- MCI
2 stops7h 45m
Southwest
Sat 8/225:40 am
MCI
- ONT
2 stops7h 35m
Southwest
Deal found 7/8![Southwest logo]()
$379
This United Airlines deal was found by Cheapflights users on 7/6. 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 10/248:03 am
ONT
- COU
2 stops12h 52m
United Airlines
Wed 10/2811:15 am
COU
- ONT
2 stops13h 38m
United Airlines
Deal found 7/6![United Airlines logo]()
$419
This United Airlines deal was found by Cheapflights users on 7/8. 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.
Sat 8/291:18 pm
ONT
- SGF
1 stop5h 29m
United Airlines
Thu 9/311:20 am
SGF
- ONT
2 stops10h 41m
United Airlines
Deal found 7/8![United Airlines logo]()
$424
This United Airlines deal was found by Cheapflights users on 7/6. 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 9/227:00 am
ONT
- JLN
1 stop9h 46m
United Airlines
Thu 10/11:30 pm
JLN
- ONT
2 stops9h 01m
United Airlines
Deal found 7/6![United Airlines logo]()
$459
This United Airlines deal was found by Cheapflights users on 7/8. 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.
Wed 8/55:45 am
ONT
- SGF
1 stop8h 35m
United Airlines
Wed 8/129:00 am
SGF
- ONT
1 stop5h 50m
United Airlines
Deal found 7/8![United Airlines logo]()
$473
This United Airlines deal was found by Cheapflights users on 7/10. 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.
Thu 9/245:00 am
ONT
- SGF
1 stop5h 56m
United Airlines
Mon 9/283:05 pm
SGF
- ONT
1 stop8h 54m
United Airlines
Deal found 7/10![United Airlines logo]()
$479
Last-minute flights from Ontario to MissouriDiscover last-minute flight deals from Ontario to Missouri. Data last updated July 11, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Missouri. Data last updated July 11, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 7/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/296:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Tue 8/41:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 7/6![Frontier logo]()
$260
This Expedia deal was found by Cheapflights users on 7/7. 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 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 8/111:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Deal found 7/7![Frontier logo]()
$247
This Kiwi.com deal was found by Cheapflights users on 7/10. 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.
Tue 8/46:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Sun 8/94:32 pm
MCI
- ONT
1 stop17h 31m
Frontier
Deal found 7/10![Frontier logo]()
$261
This Delta deal was found by Cheapflights users on 7/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/65:05 pm
ONT
- MCI
1 stop5h 08m
Delta
Wed 8/127:00 am
MCI
- ONT
1 stop7h 16m
Delta
Deal found 7/8![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 7/9. 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 8/81:50 pm
ONT
- MCI
1 stop6h 41m
United Airlines
Sat 8/2211:22 am
MCI
- ONT
2 stops10h 39m
United Airlines
Deal found 7/9![United Airlines logo]()
$254
This Frontier deal was found by Cheapflights users on 7/9. 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
Sat 8/151:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 7/9![Frontier logo]()
$244
This Southwest deal was found by Cheapflights users on 7/8. 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.
Tue 8/117:25 am
ONT
- STL
1 stop7h 20m
Southwest
Tue 8/257:00 am
STL
- ONT
1 stop5h 15m
Southwest
Deal found 7/8![Southwest logo]()
$262
This American Airlines deal was found by Cheapflights users on 7/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/152:43 pm
ONT
- STL
1 stop6h 59m
American Airlines
Sat 8/228:00 am
STL
- ONT
1 stop6h 03m
American Airlines
Deal found 7/9![American Airlines logo]()
$263
This Frontier deal was found by Cheapflights users on 7/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:00 am
ONT
- MCI
1 stop4h 53m
Frontier
Sat 8/291:38 pm
MCI
- ONT
1 stop12h 12m
Frontier
Deal found 7/8![Frontier logo]()
$245
This American Airlines deal was found by Cheapflights users on 7/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/292:43 pm
ONT
- MCI
1 stop6h 07m
American Airlines
Mon 8/315:30 am
MCI
- ONT
1 stop6h 04m
American Airlines
Deal found 7/9![American Airlines logo]()
$249
This Southwest deal was found by Cheapflights users on 7/10. 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.
Sat 8/2910:35 am
ONT
- MCI
2 stops7h 55m
Southwest
Tue 9/112:35 pm
MCI
- ONT
1 stop5h 30m
Southwest
Deal found 7/10![Southwest logo]()
$250
This United Airlines deal was found by Cheapflights users on 7/9. 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 8/295:00 am
ONT
- MCI
2 stops10h 30m
United Airlines
Wed 9/21:43 pm
MCI
- ONT
2 stops8h 18m
United Airlines
Deal found 7/9![United Airlines logo]()
$259
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 July 11, 2026.
Search for one-way flight options from Ontario to Missouri. Find affordable one-way fares based on user searches. Data last updated July 11, 2026.
This Super.com deal was found by Cheapflights users on 7/10. 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.
Sat 8/156:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 7/10![Frontier logo]()
$120
This Frontier deal was found by Cheapflights users on 7/8. 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 Frontier 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 7/8![Frontier logo]()
$122
This Frontier deal was found by Cheapflights users on 7/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:15 am
ONT
- MCI
1 stop5h 07m
Frontier
Deal found 7/8![Frontier logo]()
$125
This Booking.com deal was found by Cheapflights users on 7/9. 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.
Wed 8/197:56 pm
ONT
- MCI
1 stop15h 24m
Frontier
Deal found 7/9![Frontier logo]()
$128
This Delta deal was found by Cheapflights users on 7/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:00 am
ONT
- MCI
1 stop6h 08m
Delta
Deal found 7/8![Delta logo]()
$129
This Super.com deal was found by Cheapflights users on 7/10. 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.
Wed 8/1210:49 am
ONT
- STL
1 stop6h 34m
Frontier
Deal found 7/10![Frontier logo]()
$130
This Southwest deal was found by Cheapflights users on 7/9. 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.
Sat 9/57:05 am
ONT
- STL
1 stop7h 45m
Southwest
Deal found 7/9![Southwest logo]()
$131
This Booking.com deal was found by Cheapflights users on 7/7. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/55:08 pm
ONT
- MCI
1 stop20h 39m
Frontier
Deal found 7/7![Frontier logo]()
$131
This Trip.com deal was found by Cheapflights users on 7/9. 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.
Tue 10/2011:38 am
ONT
- MCI
1 stop23h 44m
Frontier
Deal found 7/9![Frontier logo]()
$132
This CheapOair deal was found by Cheapflights users on 7/8. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/232:55 pm
ONT
- MCI
1 stop20h 27m
Frontier
Deal found 7/8![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 7/9. 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.
Sat 9/510:59 am
ONT
- STL
2 stops28h 23m
Frontier
Deal found 7/9![Frontier logo]()
$134
This Frontier deal was found by Cheapflights users on 7/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/286:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 7/6![Frontier logo]()
$135
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 July 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $244 (Frontier) |
One-way from | $120 (Super.com) |
Popular in | March |
Cheapest in | October |
Average price | $444 |
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 July 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
Tue 8/25
5:00 am-12:37 pm
1 stop5h 37m
Kansas City
Sat 8/29
3:29 pm-8:01 pm
1 stop6h 32m
$249
OntarioKansas City
ONT - MCI
ONTMCI
Ontario
Sat 8/29
10:35 am-8:30 pm
2 stops7h 55m
Kansas City
Tue 9/1
12:35 pm-4:05 pm
1 stop5h 30m
$250
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Tue 8/11
7:25 am-4:45 pm
1 stop7h 20m
Lambert-St Louis
Tue 8/25
7:00 am-10:15 am
1 stop5h 15m
$262
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Wed 9/9
2:10 pm-10:45 pm
1 stop6h 35m
Lambert-St Louis
Wed 9/16
5:35 am-8:55 am
1 stop5h 20m
$262
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Tue 8/11
7:25 am-4:45 pm
1 stop7h 20m
Lambert-St Louis
Tue 8/18
11:55 am-8:05 pm
2 stops10h 10m
$267
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Mon 8/31
5:15 am-5:20 pm
2 stops10h 05m
Lambert-St Louis
Mon 10/19
5:05 am-9:25 am
1 stop6h 20m
$268
Quickest round-trip
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Tue 8/4
5:05 pm-12:41 am
1 stop5h 36m
Lambert-St Louis
Mon 8/10
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
Sat 8/8
5:00 pm-10:23 pm
1 stop7h 23m
$277
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Sat 8/29
1:06 pm-9:00 pm
1 stop5h 54m
Lambert-St Louis
Sat 9/5
5:00 pm-10:23 pm
1 stop7h 23m
$277
OntarioKansas City
ONT - MCI
ONTMCI
Ontario
Fri 8/7
11:55 pm-9:15 am
1 stop7h 20m
Kansas City
Mon 8/10
7:00 pm-9:45 pm
1 stop4h 45m
$282
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-MCI
ONT-STL
ONT-COU
ONT-SGF
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-MCI
ONT-STL
ONT-COU
ONT-SGF
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 July 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.
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Food
7.0
Entertainment
7.5
Overall
7.9
Boarding
8.1
Crew
8.6
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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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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 July 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 July 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$98 | Average$422 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$158 | Average$265 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$236 | Average$563 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$241 | Average$471 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$259 | Average$466 | FlexibilityNo cancel fee | On-time71% |