$181+ 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 9/16. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STL
Aug 27 — Sep 31
Round-trip
1 adult, Economy
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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 28, 2026.
Explore the most affordable flight options available from Ontario to Missouri. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 28, 2026.
This American Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/143:13 pm
YYZ
- STL
1 stop10h 14m
American Airlines
Mon 9/217:21 am
STL
- YYZ
1 stop10h 14m
American Airlines
Deal found 7/26![American Airlines logo]()
$324
This American Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/81:15 pm
YYZ
- STL
1 stop11h 59m
American Airlines
Fri 9/115:00 am
STL
- YYZ
1 stop8h 32m
American Airlines
Deal found 7/26![American Airlines logo]()
$329
This American Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:30 am
YYZ
- STL
1 stop7h 46m
American Airlines
Thu 9/175:00 am
STL
- YYZ
1 stop8h 32m
American Airlines
Deal found 7/26![American Airlines logo]()
$334
This American Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:30 am
YYZ
- STL
1 stop7h 46m
American Airlines
Mon 9/217:21 am
STL
- YYZ
1 stop10h 14m
American Airlines
Deal found 7/27![American Airlines logo]()
$335
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/28:10 am
YYZ
- MCI
2 stops10h 06m
Multiple Airlines
Mon 10/59:16 am
MCI
- YYZ
1 stop30h 39m
Multiple Airlines
Deal found 7/23![Multiple Airlines logo]()
$346
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/46:30 am
YYZ
- MCI
1 stop26h 56m
Multiple Airlines
Fri 10/99:16 am
MCI
- YYZ
1 stop10h 39m
Multiple Airlines
Deal found 7/26![Multiple Airlines logo]()
$353
This American Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/223:13 pm
YYZ
- STL
1 stop9h 45m
American Airlines
Sat 8/295:00 am
STL
- YYZ
1 stop8h 33m
American Airlines
Deal found 7/23![American Airlines logo]()
$354
This American Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/201:15 pm
YYZ
- STL
1 stop11h 59m
American Airlines
Sat 8/295:00 am
STL
- YYZ
1 stop12h 30m
American Airlines
Deal found 7/25![American Airlines logo]()
$365
This American Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/171:15 pm
YYZ
- STL
1 stop11h 59m
American Airlines
Wed 8/196:00 am
STL
- YYZ
1 stop7h 33m
American Airlines
Deal found 7/27![American Airlines logo]()
$373
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:15 pm
YYZ
- STL
1 stop27h 24m
Multiple Airlines
Tue 11/310:35 am
STL
- YYZ
2 stops12h 35m
Multiple Airlines
Deal found 7/23![Multiple Airlines logo]()
$399
This American Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1512:31 pm
YUL
- STL
1 stop12h 56m
American Airlines
Sat 9/197:27 am
STL
- YUL
1 stop8h 26m
American Airlines
Deal found 7/23![American Airlines logo]()
$407
This Delta deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/156:00 am
YYZ
- MCI
1 stop4h 51m
Delta
Wed 9/1610:28 am
MCI
- YYZ
1 stop6h 41m
Delta
Deal found 7/26![Delta logo]()
$411
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 28, 2026.
Discover carefully curated flight deals from Ontario to Missouri that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 28, 2026.
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1810:00 am
YYZ
- MCI
1 stop9h 04m
Delta
Tue 8/252:58 pm
MCI
- YYZ
1 stop7h 59m
Delta
Deal found 7/27![Delta logo]()
$411
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:10 am
YUL
- MCI
1 stop5h 15m
United Airlines
Tue 9/87:32 am
MCI
- YUL
2 stops11h 13m
United Airlines
Deal found 7/26![United Airlines logo]()
$413
This Air Canada deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/149:00 am
YOW
- STL
1 stop6h 04m
Air Canada
Sat 8/2212:10 pm
STL
- YOW
1 stop6h 35m
Air Canada
Deal found 7/24![Air Canada logo]()
$467
This Delta deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/156:00 am
YYZ
- MCI
1 stop4h 51m
Delta
Wed 9/1610:28 am
MCI
- YYZ
1 stop6h 41m
Delta
Deal found 7/26![Delta logo]()
$411
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:00 am
YUL
- MCI
1 stop9h 23m
United Airlines
Wed 11/116:10 am
MCI
- YUL
1 stop6h 18m
United Airlines
Deal found 7/26![United Airlines logo]()
$413
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1210:00 am
YYZ
- MCI
1 stop9h 04m
Delta
Sat 8/224:04 pm
MCI
- YYZ
1 stop6h 06m
Delta
Deal found 7/27![Delta logo]()
$411
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/159:15 am
YUL
- MCI
1 stop6h 35m
United Airlines
Sat 8/2212:10 pm
MCI
- YUL
1 stop6h 35m
United Airlines
Deal found 7/26![United Airlines logo]()
$413
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/176:15 am
YYZ
- MCI
1 stop5h 54m
Delta
Tue 10/203:36 pm
MCI
- YYZ
1 stop5h 23m
Delta
Deal found 7/24![Delta logo]()
$412
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/103:00 pm
YUL
- MCI
1 stop6h 39m
United Airlines
Wed 11/1811:33 am
MCI
- YUL
1 stop7h 15m
United Airlines
Deal found 7/27![United Airlines logo]()
$413
This Air Canada deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/154:55 pm
YUL
- STL
Nonstop2h 46m
Air Canada
Mon 10/1912:10 pm
STL
- YUL
Nonstop2h 31m
Air Canada
Deal found 7/27![Air Canada logo]()
$500
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/129:45 am
YYZ
- MCI
1 stop4h 33m
Delta
Tue 9/156:30 am
MCI
- YYZ
1 stop3h 48m
Delta
Deal found 7/25![Delta logo]()
$412
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/113:00 pm
YUL
- MCI
1 stop6h 39m
United Airlines
Tue 11/176:10 am
MCI
- YUL
1 stop6h 18m
United Airlines
Deal found 7/27![United Airlines logo]()
$413
This Air Canada deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2110:15 am
YYZ
- STL
1 stop6h 23m
Air Canada
Fri 8/2810:53 am
STL
- YYZ
1 stop5h 08m
Air Canada
Deal found 7/24![Air Canada logo]()
$531
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/36:00 am
YUL
- MCI
1 stop8h 18m
Delta
Wed 10/74:23 pm
MCI
- YUL
1 stop6h 36m
Delta
Deal found 7/25![Delta logo]()
$413
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/142:13 pm
YUL
- MCI
1 stop6h 42m
United Airlines
Tue 11/176:10 am
MCI
- YUL
1 stop6h 18m
United Airlines
Deal found 7/27![United Airlines logo]()
$413
This Air Canada deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1512:55 pm
YYZ
- STL
Nonstop2h 05m
Air Canada
Wed 9/168:55 am
STL
- YYZ
Nonstop1h 54m
Air Canada
Deal found 7/27![Air Canada logo]()
$536
This United Airlines deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/92:20 pm
YUL
- MCI
2 stops8h 27m
United Airlines
Sat 9/1211:22 am
MCI
- YUL
2 stops9h 44m
United Airlines
Deal found 7/24![United Airlines logo]()
$414
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/246:15 pm
YUL
- MCI
1 stop6h 43m
Delta
Sat 11/283:30 pm
MCI
- YUL
1 stop7h 07m
Delta
Deal found 7/24![Delta logo]()
$414
This Air Canada deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/202:00 pm
YYZ
- STL
1 stop5h 42m
Air Canada
Thu 8/278:55 am
STL
- YYZ
Nonstop2h 01m
Air Canada
Deal found 7/23![Air Canada logo]()
$540
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/122:31 pm
YYZ
- MCI
1 stop8h 18m
Delta
Fri 8/2110:31 am
MCI
- YYZ
1 stop5h 53m
Delta
Deal found 7/27![Delta logo]()
$424
This Air Canada deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/232:00 pm
YYZ
- STL
1 stop5h 42m
Air Canada
Sun 8/302:40 pm
STL
- YYZ
Nonstop1h 57m
Air Canada
Deal found 7/25![Air Canada logo]()
$540
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1511:00 am
YYZ
- STL
1 stop12h 00m
United Airlines
Wed 9/168:30 am
STL
- YYZ
1 stop7h 31m
United Airlines
Deal found 7/23![United Airlines logo]()
$457
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:10 am
YYZ
- MCI
1 stop8h 16m
Delta
Sat 8/222:07 pm
MCI
- YYZ
1 stop7h 52m
Delta
Deal found 7/27![Delta logo]()
$424
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1410:04 am
YYZ
- MCI
1 stop8h 30m
Delta
Mon 10/195:26 pm
MCI
- YYZ
1 stop5h 33m
Delta
Deal found 7/25![Delta logo]()
$425
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/226:10 am
YUL
- STL
1 stop10h 28m
United Airlines
Wed 9/308:00 am
STL
- YUL
1 stop9h 55m
United Airlines
Deal found 7/23![United Airlines logo]()
$483
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/266:00 am
YYZ
- MCI
1 stop6h 17m
Delta
Sun 8/307:07 am
MCI
- YYZ
1 stop9h 12m
Delta
Deal found 7/27![Delta logo]()
$425
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/159:15 am
YUL
- STL
2 stops13h 45m
United Airlines
Sat 9/1912:59 pm
STL
- YUL
2 stops21h 24m
United Airlines
Deal found 7/23![United Airlines logo]()
$483
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:51 pm
YUL
- MCI
1 stop6h 07m
Delta
Mon 8/245:18 pm
MCI
- YUL
1 stop5h 34m
Delta
Deal found 7/25![Delta logo]()
$433
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:30 pm
YUL
- STL
1 stop21h 27m
United Airlines
Wed 9/98:30 am
STL
- YUL
1 stop9h 31m
United Airlines
Deal found 7/26![United Airlines logo]()
$503
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/151:15 pm
YUL
- STL
1 stop9h 06m
United Airlines
Mon 10/195:36 pm
STL
- YUL
1 stop16h 04m
United Airlines
Deal found 7/23![United Airlines logo]()
$504
Last-minute flights from Ontario to MissouriDiscover last-minute flight deals from Ontario to Missouri. Data last updated July 28, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Missouri. Data last updated July 28, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/126:34 pm
YYZ
- MCI
1 stop6h 24m
Delta
Wed 8/1910:31 am
MCI
- YYZ
1 stop5h 53m
Delta
Deal found 7/24![Delta logo]()
$412
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/122:31 pm
YYZ
- MCI
1 stop8h 18m
Delta
Thu 8/201:31 pm
MCI
- YYZ
1 stop9h 26m
Delta
Deal found 7/27![Delta logo]()
$424
This Delta deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:10 am
YYZ
- MCI
1 stop4h 35m
Delta
Tue 8/189:59 am
MCI
- YYZ
2 stops12h 04m
Delta
Deal found 7/26![Delta logo]()
$417
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:10 am
YYZ
- MCI
1 stop4h 35m
Delta
Sat 8/224:04 pm
MCI
- YYZ
1 stop6h 06m
Delta
Deal found 7/27![Delta logo]()
$425
This American Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/135:25 pm
YYZ
- MCI
1 stop5h 20m
American Airlines
Sat 8/225:00 am
MCI
- YYZ
1 stop6h 33m
American Airlines
Deal found 7/27![American Airlines logo]()
$430
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/159:15 am
YUL
- MCI
1 stop6h 35m
United Airlines
Sat 8/2212:10 pm
MCI
- YUL
1 stop6h 35m
United Airlines
Deal found 7/26![United Airlines logo]()
$413
This American Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/171:15 pm
YYZ
- STL
1 stop11h 59m
American Airlines
Wed 8/196:00 am
STL
- YYZ
1 stop7h 33m
American Airlines
Deal found 7/27![American Airlines logo]()
$373
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1810:00 am
YYZ
- MCI
1 stop9h 04m
Delta
Tue 8/252:58 pm
MCI
- YYZ
1 stop7h 59m
Delta
Deal found 7/27![Delta logo]()
$411
This American Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/198:00 am
YYZ
- MCI
1 stop6h 32m
American Airlines
Wed 9/26:15 am
MCI
- YYZ
1 stop9h 30m
American Airlines
Deal found 7/23![American Airlines logo]()
$416
This American Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/201:15 pm
YYZ
- STL
1 stop11h 59m
American Airlines
Sat 8/295:00 am
STL
- YYZ
1 stop12h 30m
American Airlines
Deal found 7/25![American Airlines logo]()
$365
This American Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:20 am
YYZ
- STL
1 stop10h 03m
American Airlines
Thu 8/276:00 am
STL
- YYZ
1 stop9h 45m
American Airlines
Deal found 7/23![American Airlines logo]()
$414
This American Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/223:13 pm
YYZ
- STL
1 stop9h 45m
American Airlines
Sat 8/295:00 am
STL
- YYZ
1 stop8h 33m
American Airlines
Deal found 7/23![American Airlines logo]()
$354
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 28, 2026.
Search for one-way flight options from Ontario to Missouri. Find affordable one-way fares based on user searches. Data last updated July 28, 2026.
This American Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:30 am
YYZ
- STL
1 stop7h 46m
American Airlines
Deal found 7/23![American Airlines logo]()
$181
This American Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/37:20 am
YYZ
- STL
1 stop10h 00m
American Airlines
Deal found 7/23![American Airlines logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/136:30 am
YYZ
- STL
2 stops31h 40m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$192
This American Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/73:14 pm
YYZ
- STL
1 stop10h 00m
American Airlines
Deal found 7/26![American Airlines logo]()
$197
This American Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/313:14 pm
YYZ
- STL
1 stop10h 00m
American Airlines
Deal found 7/23![American Airlines logo]()
$202
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:30 am
YYZ
- STL
2 stops31h 40m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$203
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:30 am
YYZ
- STL
2 stops31h 40m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$206
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/244:45 pm
YYZ
- STL
2 stops21h 46m
Multiple Airlines
Deal found 7/26![Multiple Airlines logo]()
$207
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/314:45 pm
YYZ
- STL
2 stops21h 46m
Multiple Airlines
Deal found 7/23![Multiple Airlines logo]()
$208
This Kiwi.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/111:30 pm
YYZ
- MCI
2 stops28h 46m
Multiple Airlines
Deal found 7/23![Multiple Airlines logo]()
$209
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/74:45 pm
YYZ
- STL
2 stops21h 36m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$209
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/214:45 pm
YYZ
- MCI
2 stops27h 52m
Multiple Airlines
Deal found 7/25![Multiple Airlines logo]()
$210
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 28, 2026.
Round-trip from | $324 (American Airlines) |
|---|---|
One-way from | $181 (American Airlines) |
Popular in | March |
Cheapest in | January |
Average price | $470 |
Good round-trip deal | $470 or less |
Good one-way deal | $298 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 July 28, 2026.
Use the filters below to find and compare flights from Ontario to Missouri that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
TorontoKansas City
YYZ - MCI
YYZMCI
Toronto Pearson Intl
Tue 8/18
10:00 am-6:04 pm
1 stop9h 04m
Kansas City
Tue 8/25
2:58 pm-11:57 pm
1 stop7h 59m
$411
TorontoKansas City
YYZ - MCI
YYZMCI
Toronto Pearson Intl
Tue 9/15
6:00 am-9:51 am
1 stop4h 51m
Kansas City
Wed 9/16
10:28 am-6:09 pm
1 stop6h 41m
$411
TorontoKansas City
YYZ - MCI
YYZMCI
Toronto Pearson Intl
Wed 8/12
10:00 am-6:04 pm
1 stop9h 04m
Kansas City
Sat 8/22
4:04 pm-11:10 pm
1 stop6h 06m
$411
TorontoKansas City
YYZ - MCI
YYZMCI
Toronto Pearson Intl
Sat 10/17
6:15 am-11:09 am
1 stop5h 54m
Kansas City
Tue 10/20
3:36 pm-9:59 pm
1 stop5h 23m
$412
TorontoKansas City
YYZ - MCI
YYZMCI
Toronto Pearson Intl
Sat 9/12
9:45 am-1:18 pm
1 stop4h 33m
Kansas City
Tue 9/15
6:30 am-11:18 am
1 stop3h 48m
$412
MontrealKansas City
YUL - MCI
YULMCI
Montreal Pierre Elliott Trudeau Intl
Tue 9/1
6:10 am-10:25 am
1 stop5h 15m
Kansas City
Tue 9/8
7:32 am-7:45 pm
2 stops11h 13m
$413
MontrealKansas City
YUL - MCI
YULMCI
Montreal Pierre Elliott Trudeau Intl
Tue 11/3
6:00 am-2:23 pm
1 stop9h 23m
Kansas City
Wed 11/11
6:10 am-1:28 pm
1 stop6h 18m
$413
MontrealKansas City
YUL - MCI
YULMCI
Montreal Pierre Elliott Trudeau Intl
Sat 8/15
9:15 am-2:50 pm
1 stop6h 35m
Kansas City
Sat 8/22
12:10 pm-7:45 pm
1 stop6h 35m
$413
MontrealKansas City
YUL - MCI
YULMCI
Montreal Pierre Elliott Trudeau Intl
Tue 11/10
3:00 pm-8:39 pm
1 stop6h 39m
Kansas City
Wed 11/18
11:33 am-7:48 pm
1 stop7h 15m
$413
MontrealKansas City
YUL - MCI
YULMCI
Montreal Pierre Elliott Trudeau Intl
Wed 11/11
3:00 pm-8:39 pm
1 stop6h 39m
Kansas City
Tue 11/17
6:10 am-1:28 pm
1 stop6h 18m
$413
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.
YYZ-STL
YYZ-MCI
YUL-MCI
YOW-STL
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
YYZ-STL
YYZ-MCI
YUL-MCI
YOW-STL
What is the cheapest month to book a flight from Region of Ontario to Missouri?
Currently, January is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of $421). Flying from Region of Ontario to Missouri in July is currently the most expensive (average of $958). 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 July 28, 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.
Weekly flight availability from Region of Ontario to Missouri
Explore weekly flight availability from Ontario to Missouri. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 28, 2026.
The most flights from CAON to USMO are scheduled on a Monday (4 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (4 on average).
How much does it cost to fly round-trip from Region of Ontario to Missouri?
Airfare is below average for this route at the moment.
Region of Ontario to Missouri flights typically cost between $421 and $634 in September.The cheapest round-trip price found within the last 5 days was $324 on American Airlines (Sep 14-Sep 21).
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 71 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 July 28, 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.
Food
7.2
Crew
8.5
Overall
7.8
Boarding
8.1
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentRakshith,May 2026
TPE - SEA
Food
7.2
Crew
8.5
Overall
7.8
Boarding
8.1
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentRakshith,May 2026
TPE - SEA
Food
7.2
Crew
8.5
Overall
7.8
Boarding
8.1
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentRakshith,May 2026
TPE - SEA
Food
7.2
Crew
8.5
Overall
7.8
Boarding
8.1
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentRakshith,May 2026
TPE - SEA
Food
7.2
Crew
8.5
Overall
7.8
Boarding
8.1
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.
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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 28, 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 July 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$256 | Average$432 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$373 | Average$536 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$443 | Average$585 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$530 | Average$758 | FlexibilityNo cancel fee | On-time60% |