$191+ Cheap flights from Ontario 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 7/8. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — MCI
Jul 16 — Jul 231
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Missouri with Cheapflights
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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 June 16, 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 16, 2026.
This American Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 9/91:15 pm
YYZ
- STL
1 stop12h 12m
American Airlines
Tue 9/225:00 am
STL
- YYZ
1 stop8h 32m
American Airlines
Deal found 6/15![American Airlines logo]()
$312
This American Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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 7/157:17 am
YYZ
- STL
1 stop7h 36m
American Airlines
Wed 7/226:55 am
STL
- YYZ
1 stop9h 39m
American Airlines
Deal found 6/14![American Airlines logo]()
$324
This American Airlines deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” 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 7/87:17 am
YYZ
- STL
1 stop7h 36m
American Airlines
Wed 7/156:55 am
STL
- YYZ
1 stop9h 39m
American Airlines
Deal found 6/13![American Airlines logo]()
$335
This American Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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 7/297:17 am
YYZ
- STL
1 stop10h 23m
American Airlines
Wed 8/56:00 am
STL
- YYZ
1 stop7h 33m
American Airlines
Deal found 6/14![American Airlines logo]()
$338
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/146:00 pm
YOW
- STL
1 stop6h 25m
United Airlines
Tue 12/1510:23 am
STL
- YOW
1 stop5h 51m
United Airlines
Deal found 6/11![United Airlines logo]()
$375
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/182:35 pm
YOW
- STL
1 stop5h 07m
Air Canada
Sat 11/74:15 pm
STL
- YOW
1 stop6h 33m
Air Canada
Deal found 6/11![Air Canada logo]()
$382
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:05 am
YOW
- STL
2 stops10h 33m
United Airlines
Sat 11/79:23 am
STL
- YOW
1 stop11h 11m
United Airlines
Deal found 6/11![United Airlines logo]()
$383
This Air Canada deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/289:00 am
YOW
- STL
1 stop6h 02m
Air Canada
Tue 8/412:10 pm
STL
- YOW
1 stop6h 35m
Air Canada
Deal found 6/13![Air Canada logo]()
$389
This United Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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 7/205:50 pm
YOW
- STL
1 stop6h 54m
United Airlines
Fri 7/241:13 pm
STL
- YOW
1 stop7h 22m
United Airlines
Deal found 6/14![United Airlines logo]()
$390
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 7/33:10 pm
YOW
- STL
1 stop9h 34m
United Airlines
Tue 7/711:25 am
STL
- YOW
1 stop4h 42m
United Airlines
Deal found 6/15![United Airlines logo]()
$393
This American Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 7/167:27 am
YYZ
- STL
1 stop8h 23m
American Airlines
Tue 7/219:08 am
STL
- YYZ
1 stop7h 26m
American Airlines
Deal found 6/15![American Airlines logo]()
$408
This American Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 8/1212:30 pm
YUL
- STL
1 stop12h 44m
American Airlines
Tue 8/186:00 am
STL
- YUL
1 stop9h 53m
American Airlines
Deal found 6/15![American Airlines logo]()
$414
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 16, 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 16, 2026.
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 10/2711:00 am
YOW
- STL
1 stop5h 38m
United Airlines
Wed 10/289:23 am
STL
- YOW
1 stop6h 51m
United Airlines
Deal found 6/15![United Airlines logo]()
$375
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/182:35 pm
YOW
- STL
1 stop5h 07m
Air Canada
Sat 11/74:15 pm
STL
- YOW
1 stop6h 33m
Air Canada
Deal found 6/11![Air Canada logo]()
$382
This Delta deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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 7/412:47 pm
YUL
- MCI
1 stop9h 04m
Delta
Sat 7/111:17 pm
MCI
- YUL
1 stop9h 35m
Delta
Deal found 6/14![Delta logo]()
$453
This United deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/228:45 am
YYZ
- STL
1 stop4h 26m
Multiple Airlines
Mon 7/272:40 pm
STL
- YYZ
Nonstop1h 57m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$484
This American Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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 8/77:20 am
YYZ
- SGF
1 stop16h 23m
American Airlines
Sun 8/97:15 am
SGF
- YYZ
1 stop15h 14m
American Airlines
Deal found 6/14![American Airlines logo]()
$595
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:05 am
YOW
- STL
2 stops10h 33m
United Airlines
Sat 11/79:23 am
STL
- YOW
1 stop11h 11m
United Airlines
Deal found 6/11![United Airlines logo]()
$383
This United Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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 7/205:50 pm
YOW
- STL
1 stop6h 54m
United Airlines
Fri 7/241:13 pm
STL
- YOW
1 stop7h 22m
United Airlines
Deal found 6/14![United Airlines logo]()
$390
This Air Canada deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/279:55 am
YOW
- STL
2 stops6h 43m
Air Canada
Wed 10/288:00 am
STL
- YOW
1 stop12h 34m
Air Canada
Deal found 6/15![Air Canada logo]()
$435
This United Airlines deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” 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 7/286:25 am
YOW
- STL
1 stop10h 21m
United Airlines
Tue 8/41:13 pm
STL
- YOW
2 stops9h 41m
United Airlines
Deal found 6/13![United Airlines logo]()
$390
This Delta deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 7/277:00 am
YUL
- MCI
1 stop9h 14m
Delta
Wed 7/2910:40 am
MCI
- YUL
1 stop7h 14m
Delta
Deal found 6/15![Delta logo]()
$476
This United deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/91:00 pm
YYZ
- STL
1 stop11h 29m
Multiple Airlines
Mon 7/132:40 pm
STL
- YYZ
Nonstop1h 57m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$484
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/275:50 pm
YOW
- STL
1 stop6h 54m
United Airlines
Mon 8/34:53 pm
STL
- YOW
1 stop15h 18m
United Airlines
Deal found 6/11![United Airlines logo]()
$390
This Delta deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 8/317:00 am
YUL
- MCI
1 stop10h 13m
Delta
Tue 9/15:18 pm
MCI
- YUL
1 stop5h 34m
Delta
Deal found 6/15![Delta logo]()
$476
This United deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/2511:00 am
YYZ
- STL
1 stop5h 46m
Multiple Airlines
Sun 8/92:40 pm
STL
- YYZ
Nonstop1h 57m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$485
This United Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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 7/35:50 pm
YOW
- STL
1 stop6h 54m
United Airlines
Tue 7/79:20 am
STL
- YOW
1 stop6h 47m
United Airlines
Deal found 6/14![United Airlines logo]()
$393
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” 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 9/257:00 am
YUL
- MCI
1 stop9h 06m
Delta
Tue 9/297:00 am
MCI
- YUL
1 stop9h 38m
Delta
Deal found 6/12![Delta logo]()
$476
This United deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/17:30 pm
YYZ
- STL
1 stop5h 14m
Multiple Airlines
Sat 8/82:40 pm
STL
- YYZ
Nonstop1h 57m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$485
This American Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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.
Mon 7/136:00 am
YYZ
- SGF
1 stop5h 54m
American Airlines
Fri 7/177:53 pm
SGF
- YYZ
1 stop15h 44m
American Airlines
Deal found 6/14![American Airlines logo]()
$638
This United deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/137:00 pm
YYZ
- STL
1 stop5h 44m
Multiple Airlines
Mon 7/208:55 am
STL
- YYZ
Nonstop1h 57m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$485
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” 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 11/47:00 am
YUL
- STL
1 stop6h 56m
Delta
Sat 11/76:00 am
STL
- YUL
1 stop6h 36m
Delta
Deal found 6/12![Delta logo]()
$491
This United deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/38:45 am
YYZ
- STL
1 stop4h 26m
Multiple Airlines
Mon 7/62:40 pm
STL
- YYZ
Nonstop1h 57m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$487
This Delta deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” 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 10/157:00 am
YUL
- STL
1 stop6h 56m
Delta
Mon 10/197:20 am
STL
- YUL
1 stop8h 43m
Delta
Deal found 6/13![Delta logo]()
$491
This United Airlines deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” 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 7/112:20 pm
YUL
- MCI
2 stops19h 22m
United Airlines
Sat 7/186:41 pm
MCI
- YUL
1 stop14h 59m
United Airlines
Deal found 6/13![United Airlines logo]()
$454
This United 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/39:45 am
YUL
- STL
1 stop5h 32m
Multiple Airlines
Sat 10/1012:10 pm
STL
- YUL
Nonstop2h 31m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$493
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.
Sat 10/35:10 pm
YUL
- STL
1 stop4h 25m
Delta
Sat 10/105:30 pm
STL
- YUL
1 stop5h 21m
Delta
Deal found 6/11![Delta logo]()
$493
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 10/276:10 am
YUL
- STL
1 stop9h 08m
United Airlines
Wed 10/288:00 am
STL
- YUL
1 stop10h 00m
United Airlines
Deal found 6/15![United Airlines logo]()
$471
This Delta deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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 8/176:47 pm
YUL
- MCI
1 stop6h 11m
Delta
Mon 8/247:07 am
MCI
- YUL
1 stop9h 35m
Delta
Deal found 6/14![Delta logo]()
$498
This United Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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 7/166:10 am
YUL
- MCI
1 stop5h 19m
United Airlines
Sat 7/183:26 pm
MCI
- YUL
1 stop5h 40m
United Airlines
Deal found 6/14![United Airlines logo]()
$476
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” 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 7/256:00 am
YUL
- MCI
1 stop4h 44m
Delta
Sun 7/267:57 pm
MCI
- YUL
2 stops26h 43m
Delta
Deal found 6/12![Delta logo]()
$518
This United Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” 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 7/97:00 pm
YYZ
- STL
1 stop5h 44m
United Airlines
Sat 7/116:00 am
STL
- YYZ
2 stops12h 02m
United Airlines
Deal found 6/12![United Airlines logo]()
$484
Last-minute flights from Ontario to MissouriDiscover last-minute flight deals from Ontario to Missouri. Data last updated June 16, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Missouri. Data last updated June 16, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 7/33:10 pm
YOW
- STL
1 stop9h 34m
United Airlines
Tue 7/711:25 am
STL
- YOW
1 stop4h 42m
United Airlines
Deal found 6/15![United Airlines logo]()
$393
This American Airlines deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” 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 7/87:17 am
YYZ
- STL
1 stop7h 36m
American Airlines
Wed 7/156:55 am
STL
- YYZ
1 stop9h 39m
American Airlines
Deal found 6/13![American Airlines logo]()
$335
This Kiwi.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” 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 7/117:00 am
YYZ
- STL
1 stop12h 15m
Multiple Airlines
Tue 7/147:03 pm
STL
- YYZ
2 stops33h 07m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$425
This Kiwi.com deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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 7/146:30 am
YYZ
- STL
2 stops27h 27m
Multiple Airlines
Tue 7/217:03 pm
STL
- YYZ
1 stop10h 36m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$421
This American Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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 7/157:17 am
YYZ
- STL
1 stop7h 36m
American Airlines
Tue 7/219:08 am
STL
- YYZ
1 stop7h 26m
American Airlines
Deal found 6/14![American Airlines logo]()
$324
This Kiwi.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” 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 7/153:50 pm
YYZ
- STL
2 stops27h 25m
Multiple Airlines
Wed 7/227:03 pm
STL
- YYZ
1 stop10h 36m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$420
This American Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 7/167:27 am
YYZ
- STL
1 stop8h 23m
American Airlines
Tue 7/219:08 am
STL
- YYZ
1 stop7h 26m
American Airlines
Deal found 6/15![American Airlines logo]()
$408
This United Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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 7/205:50 pm
YOW
- STL
1 stop6h 54m
United Airlines
Fri 7/241:13 pm
STL
- YOW
1 stop7h 22m
United Airlines
Deal found 6/14![United Airlines logo]()
$390
This American Airlines deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” 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 7/227:17 am
YYZ
- STL
1 stop7h 36m
American Airlines
Mon 7/275:48 pm
STL
- YYZ
1 stop5h 02m
American Airlines
Deal found 6/16![American Airlines logo]()
$414
This Kiwi.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” 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 7/222:50 pm
YYZ
- STL
2 stops28h 25m
Multiple Airlines
Mon 7/277:10 pm
STL
- YYZ
1 stop20h 59m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$418
This Air Canada deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/289:00 am
YOW
- STL
1 stop6h 02m
Air Canada
Tue 8/412:10 pm
STL
- YOW
1 stop6h 35m
Air Canada
Deal found 6/13![Air Canada logo]()
$389
This American Airlines deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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 7/297:17 am
YYZ
- STL
1 stop10h 23m
American Airlines
Wed 8/56:00 am
STL
- YYZ
1 stop7h 33m
American Airlines
Deal found 6/14![American Airlines logo]()
$338
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 16, 2026.
Search for one-way flight options from Ontario to Missouri. Find affordable one-way fares based on user searches. Data last updated June 16, 2026.
This American Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” 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 7/81:17 pm
YYZ
- STL
1 stop11h 59m
American Airlines
Deal found 6/12![American Airlines logo]()
$191
This American Airlines deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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.
Tue 7/143:14 pm
YYZ
- STL
1 stop10h 02m
American Airlines
Deal found 6/15![American Airlines logo]()
$196
This Air Canada deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/62:35 pm
YOW
- STL
1 stop5h 06m
Air Canada
Deal found 6/14![Air Canada logo]()
$211
This Kiwi.com deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” 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 7/148:00 am
YYZ
- STL
3 stops35h 05m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$211
This Kiwi.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” 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 7/146:30 am
YYZ
- MCI
2 stops35h 40m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$216
This Kiwi.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” 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.
Fri 7/102:50 pm
YYZ
- STL
2 stops28h 25m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$216
This Kiwi.com deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/612:00 pm
YYZ
- MCI
3 stops28h 47m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$218
This Kiwi.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” 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 7/810:00 am
YYZ
- MCI
3 stops30h 47m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$219
This Kiwi.com deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” 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.
Sun 7/268:00 am
YYZ
- STL
3 stops35h 15m
Multiple Airlines
Deal found 6/14![Multiple Airlines logo]()
$219
This Kiwi.com deal was found by Cheapflights users on 6/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1612:00 pm
YYZ
- MCI
3 stops28h 47m
Multiple Airlines
Deal found 6/16![Multiple Airlines logo]()
$220
This Kiwi.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” 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 7/152:50 pm
YYZ
- STL
2 stops28h 25m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$222
This Kiwi.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” 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.
Sun 7/127:30 am
YYZ
- MCI
2 stops34h 40m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$235
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 16, 2026.
Round-trip from | $312 (American Airlines) |
|---|---|
One-way from | $191 (American Airlines) |
Popular in | March |
Cheapest in | January |
Average price | $454 |
Good round-trip deal | $451 or less |
Good one-way deal | $252 or less |
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 16, 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
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Tue 10/27
11:00 am-3:38 pm
1 stop5h 38m
Lambert-St Louis
Wed 10/28
9:23 am-5:14 pm
1 stop6h 51m
$375
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Tue 8/18
2:35 pm-6:42 pm
1 stop5h 07m
Lambert-St Louis
Sat 11/7
4:15 pm-11:48 pm
1 stop6h 33m
$382
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Tue 8/18
6:05 am-3:38 pm
2 stops10h 33m
Lambert-St Louis
Sat 11/7
9:23 am-9:34 pm
1 stop11h 11m
$383
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Mon 7/20
5:50 pm-11:44 pm
1 stop6h 54m
Lambert-St Louis
Fri 7/24
1:13 pm-9:35 pm
1 stop7h 22m
$390
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Tue 7/28
6:25 am-3:46 pm
1 stop10h 21m
Lambert-St Louis
Tue 8/4
1:13 pm-11:54 pm
2 stops9h 41m
$390
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Mon 7/27
5:50 pm-11:44 pm
1 stop6h 54m
Lambert-St Louis
Mon 8/3
4:53 pm-9:11 am
1 stop15h 18m
$390
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Fri 7/3
5:50 pm-11:44 pm
1 stop6h 54m
Lambert-St Louis
Tue 7/7
9:20 am-5:07 pm
1 stop6h 47m
$393
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Tue 10/27
9:55 am-3:38 pm
2 stops6h 43m
Lambert-St Louis
Wed 10/28
8:00 am-9:34 pm
1 stop12h 34m
$435
MontrealKansas City
YUL - MCI
YULMCI
Montreal Pierre Elliott Trudeau Intl
Sat 7/4
12:47 pm-8:51 pm
1 stop9h 04m
Kansas City
Sat 7/11
1:17 pm-11:52 pm
1 stop9h 35m
$453
MontrealKansas City
YUL - MCI
YULMCI
Montreal Pierre Elliott Trudeau Intl
Sat 7/11
2:20 pm-8:42 am
2 stops19h 22m
Kansas City
Sat 7/18
6:41 pm-10:40 am
1 stop14h 59m
$454
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.
YOW-STL
YUL-MCI
YYZ-STL
YYZ-SGF
YUL-STL
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
CAON-USMO
YOW-STL
YUL-MCI
YYZ-STL
YYZ-SGF
What is the cheapest month to book a flight from Region of Ontario to Missouri?
Currently, December is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of $168). Flying from Region of Ontario to Missouri in April is currently the most expensive (average of $356). 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.
What is the cheapest time of day to fly from ON to MO?
Find hourly flight availability from Ontario to Missouri. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 16, 2026.
Unlike in the evening, when flights are generally more expensive, you can save up to 35% on flights from Region of Ontario to Missouri by exploring options for tickets in the morning.
How much does it cost to fly round-trip from Region of Ontario to Missouri?
How far ahead should I book a flight from Region of Ontario to Missouri?
To ensure you get the cheapest price possible for a flight from Region of Ontario to Missouri, you should look to book at least 70 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
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 16, 2026.
Peruse reviews from past customers who have flown with Delta,United Airlines, andWestJet from Ontario to Missouri to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.9
Food
7.2
Boarding
8.1
Crew
8.5
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentRakshith,May 2026
TPE - SEA
Overall
7.9
Food
7.2
Boarding
8.1
Crew
8.5
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentRakshith,May 2026
TPE - SEA
Overall
7.9
Food
7.2
Boarding
8.1
Crew
8.5
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentRakshith,May 2026
TPE - SEA
Overall
7.9
Food
7.2
Boarding
8.1
Crew
8.5
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentRakshith,May 2026
TPE - SEA
Overall
7.9
Food
7.2
Boarding
8.1
Crew
8.5
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentRakshith,May 2026
TPE - SEA
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
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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 16, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Missouri
Find the right flight back to Ontario after your stay in Missouri
Ontario to Missouri flights
Consider these flights traveling from Ontario to Missouri.
Top 4 airlines flying from Ontario to Missouri
Discover the top 4 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 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$256 | Average$432 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$428 | Average$725 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$443 | Average$587 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$530 | Average$758 | FlexibilityNo cancel fee | On-time60% |