$184+ 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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STL
Apr 16 — Apr 231
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Ontario to Missouri
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to MissouriExplore the most affordable flight options available from Ontario to Missouri. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 17, 2026.
Explore the most affordable flight options available from Ontario to Missouri. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 17, 2026.
This United Airlines deal was found by Cheapflights users on 3/13. 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 4/112:40 pm
YOW
- STL
1 stop5h 42m
United Airlines
Tue 4/149:10 am
STL
- YOW
1 stop6h 57m
United Airlines
Deal found 3/13![United Airlines logo]()
$291
This United Airlines deal was found by Cheapflights users on 3/15. 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 5/225:20 pm
YOW
- STL
1 stop4h 56m
United Airlines
Sun 5/241:13 pm
STL
- YOW
2 stops9h 41m
United Airlines
Deal found 3/15![United Airlines logo]()
$308
This United Airlines deal was found by Cheapflights users on 3/14. 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.
Sat 4/115:25 pm
YOW
- STL
1 stop4h 48m
United Airlines
Sat 4/188:21 am
STL
- YOW
2 stops9h 34m
United Airlines
Deal found 3/14![United Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 3/13. 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 4/1410:44 am
YOW
- STL
1 stop11h 29m
United Airlines
Fri 4/177:45 am
STL
- YOW
1 stop5h 14m
United Airlines
Deal found 3/13![United Airlines logo]()
$341
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Mon 4/2710:44 am
YOW
- STL
1 stop11h 29m
United Airlines
Mon 5/47:45 am
STL
- YOW
1 stop5h 14m
United Airlines
Deal found 3/13![United Airlines logo]()
$344
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Thu 4/166:00 am
YOW
- MCI
2 stops9h 25m
United Airlines
Sat 4/186:15 am
MCI
- YOW
1 stop9h 52m
United Airlines
Deal found 3/13![United Airlines logo]()
$344
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Mon 4/1310:25 am
YOW
- STL
2 stops11h 48m
United Airlines
Thu 4/169:10 am
STL
- YOW
1 stop6h 57m
United Airlines
Deal found 3/13![United Airlines logo]()
$349
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Sun 4/126:25 am
YOW
- STL
1 stop5h 20m
United Airlines
Fri 4/1710:00 am
STL
- YOW
2 stops10h 16m
United Airlines
Deal found 3/13![United Airlines logo]()
$357
This United Airlines deal was found by Cheapflights users on 3/15. 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.
Wed 4/295:25 pm
YOW
- MCI
1 stop5h 39m
United Airlines
Sat 5/25:40 pm
MCI
- YOW
1 stop15h 23m
United Airlines
Deal found 3/15![United Airlines logo]()
$357
This United Airlines deal was found by Cheapflights users on 3/15. 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.
Wed 4/296:25 am
YOW
- MCI
1 stop9h 00m
United Airlines
Sun 5/36:17 am
MCI
- YOW
1 stop14h 18m
United Airlines
Deal found 3/15![United Airlines logo]()
$360
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Sun 4/1212:00 pm
YOW
- STL
2 stops10h 13m
United Airlines
Mon 4/207:45 am
STL
- YOW
2 stops12h 31m
United Airlines
Deal found 3/13![United Airlines logo]()
$366
This United Airlines deal was found by Cheapflights users on 3/15. 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.
Wed 6/35:20 pm
YOW
- STL
1 stop4h 56m
United Airlines
Sat 6/66:00 am
STL
- YOW
2 stops8h 11m
United Airlines
Deal found 3/15![United Airlines logo]()
$370
Best flights from Ontario to MissouriDiscover carefully curated flight deals from Ontario to Missouri that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 17, 2026.
Discover carefully curated flight deals from Ontario to Missouri that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 17, 2026.
This United Airlines deal was found by Cheapflights users on 3/13. 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 4/146:25 am
YOW
- STL
1 stop15h 48m
United Airlines
Mon 4/207:45 am
STL
- YOW
1 stop8h 22m
United Airlines
Deal found 3/13![United Airlines logo]()
$291
This Air Canada deal was found by Cheapflights users on 3/16. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/295:45 am
YOW
- MCI
2 stops9h 40m
Air Canada
Sat 5/29:45 am
MCI
- YOW
2 stops11h 26m
Air Canada
Deal found 3/16![Air Canada logo]()
$410
This Kiwi.com deal was found by Cheapflights users on 3/12. 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.
Sat 3/283:40 pm
YYZ
- MCI
1 stop20h 49m
Multiple Airlines
Thu 4/26:04 pm
MCI
- YYZ
1 stop12h 06m
Multiple Airlines
Deal found 3/12![Multiple Airlines logo]()
$460
This American Airlines deal was found by Cheapflights users on 3/14. 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.
Thu 6/47:20 am
YYZ
- STL
1 stop7h 46m
American Airlines
Mon 6/89:23 am
STL
- YYZ
1 stop8h 22m
American Airlines
Deal found 3/14![American Airlines logo]()
$466
This Delta deal was found by Cheapflights users on 3/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/159:30 am
YUL
- STL
1 stop10h 56m
Delta
Sat 4/185:59 pm
STL
- YUL
1 stop4h 09m
Delta
Deal found 3/16![Delta logo]()
$512
This Kiwi.com deal was found by Cheapflights users on 3/15. 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.
Sat 6/206:08 pm
YYZ
- MCI
1 stop4h 02m
WestJet
Sat 6/275:26 pm
MCI
- YYZ
1 stop5h 38m
WestJet
Deal found 3/15![WestJet logo]()
$528
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Wed 4/155:25 pm
YOW
- STL
1 stop5h 27m
United Airlines
Mon 4/207:45 am
STL
- YOW
1 stop8h 22m
United Airlines
Deal found 3/13![United Airlines logo]()
$291
This Alaska Airlines deal was found by Cheapflights users on 3/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/294:55 pm
YYZ
- MCI
2 stops24h 22m
Alaska Airlines
Wed 5/67:00 am
MCI
- YYZ
1 stop31h 45m
Alaska Airlines
Deal found 3/15![Alaska Airlines logo]()
$602
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Fri 4/175:50 pm
YOW
- STL
1 stop7h 07m
United Airlines
Sat 4/188:21 am
STL
- YOW
2 stops9h 34m
United Airlines
Deal found 3/13![United Airlines logo]()
$295
This United Airlines deal was found by Cheapflights users on 3/15. 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 5/225:20 pm
YOW
- STL
1 stop4h 56m
United Airlines
Sun 5/241:13 pm
STL
- YOW
1 stop7h 22m
United Airlines
Deal found 3/15![United Airlines logo]()
$308
This United Airlines deal was found by Cheapflights users on 3/15. 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.
Wed 6/310:44 am
YOW
- STL
1 stop11h 32m
United Airlines
Sat 6/69:23 am
STL
- YOW
1 stop11h 12m
United Airlines
Deal found 3/15![United Airlines logo]()
$308
This United Airlines deal was found by Cheapflights users on 3/14. 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.
Sat 4/116:00 am
YOW
- STL
2 stops9h 24m
United Airlines
Sat 4/189:16 am
STL
- YOW
2 stops8h 39m
United Airlines
Deal found 3/14![United Airlines logo]()
$309
This SmartFares deal was found by Cheapflights users on 3/12. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/2610:10 am
YUL
- STL
1 stop6h 15m
Air Canada
Sun 5/31:00 pm
STL
- YUL
Nonstop2h 35m
Air Canada
Deal found 3/12![Air Canada logo]()
$499
This American Airlines deal was found by Cheapflights users on 3/14. 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.
Tue 4/286:15 am
YYZ
- SGF
1 stop15h 50m
American Airlines
Tue 5/55:19 am
SGF
- YYZ
1 stop8h 14m
American Airlines
Deal found 3/14![American Airlines logo]()
$526
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
Thu 5/77:45 am
YYZ
- MCI
1 stop10h 38m
Multiple Airlines
Mon 5/114:47 pm
MCI
- YYZ
1 stop26h 13m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$533
This Delta deal was found by Cheapflights users on 3/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:59 pm
YYZ
- MCI
1 stop16h 51m
Delta
Wed 4/157:29 pm
MCI
- YYZ
1 stop12h 41m
Delta
Deal found 3/16![Delta logo]()
$533
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Mon 4/2710:44 am
YOW
- STL
1 stop11h 29m
United Airlines
Mon 5/47:45 am
STL
- YOW
1 stop5h 14m
United Airlines
Deal found 3/13![United Airlines logo]()
$344
This WestJet deal was found by Cheapflights users on 3/16. 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/128:00 am
YYZ
- MCI
2 stops9h 42m
WestJet
Mon 9/146:40 am
MCI
- YYZ
1 stop9h 05m
WestJet
Deal found 3/16![WestJet logo]()
$577
This Delta deal was found by Cheapflights users on 3/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/106:00 am
YUL
- STL
1 stop8h 10m
Delta
Sat 5/166:04 pm
STL
- YUL
1 stop4h 09m
Delta
Deal found 3/16![Delta logo]()
$533
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Thu 4/166:25 am
YOW
- MCI
1 stop9h 00m
United Airlines
Sat 4/1811:30 am
MCI
- YOW
1 stop4h 37m
United Airlines
Deal found 3/13![United Airlines logo]()
$344
This Delta deal was found by Cheapflights users on 3/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/206:45 pm
YUL
- STL
1 stop5h 51m
Delta
Sat 4/255:35 pm
STL
- YUL
1 stop4h 51m
Delta
Deal found 3/17![Delta logo]()
$534
This United Airlines deal was found by Cheapflights users on 3/12. 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.
Fri 6/57:30 pm
YOW
- MCI
2 stops15h 59m
United Airlines
Wed 6/106:00 am
MCI
- YOW
1 stop14h 35m
United Airlines
Deal found 3/12![United Airlines logo]()
$344
This Alaska Airlines deal was found by Cheapflights users on 3/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/284:55 pm
YYZ
- MCI
2 stops24h 22m
Alaska Airlines
Mon 5/45:11 pm
MCI
- YYZ
2 stops21h 34m
Alaska Airlines
Deal found 3/14![Alaska Airlines logo]()
$692
This American Airlines deal was found by Cheapflights users on 3/14. 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 6/196:00 am
YYZ
- SGF
1 stop12h 42m
American Airlines
Mon 6/227:39 pm
SGF
- YYZ
1 stop14h 20m
American Airlines
Deal found 3/14![American Airlines logo]()
$631
This Delta deal was found by Cheapflights users on 3/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/229:30 am
YUL
- MCI
2 stops12h 15m
Delta
Sat 4/255:41 pm
MCI
- YUL
1 stop4h 45m
Delta
Deal found 3/16![Delta logo]()
$551
This United Airlines deal was found by Cheapflights users on 3/12. 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.
Wed 4/2910:44 am
YOW
- MCI
1 stop6h 19m
United Airlines
Sat 5/25:40 pm
MCI
- YOW
1 stop15h 23m
United Airlines
Deal found 3/12![United Airlines logo]()
$344
This FlightHub deal was found by Cheapflights users on 3/12. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/36:10 pm
YYZ
- MCI
1 stop7h 02m
WestJet
Sun 4/126:05 am
MCI
- YYZ
2 stops8h 45m
WestJet
Deal found 3/12![WestJet logo]()
$694
This Alaska Airlines deal was found by Cheapflights users on 3/12. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/274:55 pm
YYZ
- MCI
2 stops24h 22m
Alaska Airlines
Thu 4/307:00 am
MCI
- YYZ
1 stop31h 45m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$716
This Delta deal was found by Cheapflights users on 3/15. 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.
Thu 4/92:29 pm
YUL
- MCI
1 stop9h 28m
Delta
Mon 4/136:30 am
MCI
- YUL
1 stop6h 09m
Delta
Deal found 3/15![Delta logo]()
$560
This United Airlines deal was found by Cheapflights users on 3/15. 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.
Wed 4/296:25 am
YOW
- MCI
1 stop9h 00m
United Airlines
Sun 5/36:17 am
MCI
- YOW
1 stop14h 18m
United Airlines
Deal found 3/15![United Airlines logo]()
$360
Last-minute flights from Ontario to MissouriDiscover last-minute flight deals from Ontario to Missouri. Data last updated March 17, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Missouri. Data last updated March 17, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 3/13. 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 4/112:40 pm
YOW
- STL
1 stop5h 42m
United Airlines
Tue 4/149:10 am
STL
- YOW
1 stop6h 57m
United Airlines
Deal found 3/13![United Airlines logo]()
$291
This United Airlines deal was found by Cheapflights users on 3/14. 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.
Sat 4/116:00 am
YOW
- STL
2 stops9h 24m
United Airlines
Sat 4/189:16 am
STL
- YOW
2 stops8h 39m
United Airlines
Deal found 3/14![United Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Sun 4/126:25 am
YOW
- STL
1 stop5h 20m
United Airlines
Fri 4/1710:00 am
STL
- YOW
2 stops10h 16m
United Airlines
Deal found 3/13![United Airlines logo]()
$357
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Sun 4/1212:00 pm
YOW
- STL
2 stops10h 13m
United Airlines
Mon 4/207:45 am
STL
- YOW
2 stops12h 31m
United Airlines
Deal found 3/13![United Airlines logo]()
$366
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Mon 4/1310:25 am
YOW
- STL
2 stops11h 48m
United Airlines
Mon 4/207:45 am
STL
- YOW
1 stop8h 22m
United Airlines
Deal found 3/13![United Airlines logo]()
$349
This Kiwi.com deal was found by Cheapflights users on 3/16. 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.
Mon 4/135:15 pm
YYZ
- STL
2 stops38h 35m
Multiple Airlines
Mon 4/204:59 pm
STL
- YYZ
1 stop20h 09m
Multiple Airlines
Deal found 3/16![Multiple Airlines logo]()
$393
This United Airlines deal was found by Cheapflights users on 3/13. 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 4/1410:44 am
YOW
- STL
1 stop11h 29m
United Airlines
Fri 4/177:45 am
STL
- YOW
1 stop5h 14m
United Airlines
Deal found 3/13![United Airlines logo]()
$341
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Thu 4/166:00 am
YOW
- MCI
2 stops9h 25m
United Airlines
Sat 4/186:15 am
MCI
- YOW
1 stop9h 52m
United Airlines
Deal found 3/13![United Airlines logo]()
$344
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Thu 4/166:25 am
YOW
- STL
1 stop5h 20m
United Airlines
Fri 4/177:45 am
STL
- YOW
1 stop5h 14m
United Airlines
Deal found 3/13![United Airlines logo]()
$392
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Mon 4/2710:44 am
YOW
- STL
1 stop11h 29m
United Airlines
Mon 5/47:45 am
STL
- YOW
1 stop5h 14m
United Airlines
Deal found 3/13![United Airlines logo]()
$344
This United Airlines deal was found by Cheapflights users on 3/15. 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.
Wed 4/295:25 pm
YOW
- MCI
1 stop5h 39m
United Airlines
Sat 5/25:40 pm
MCI
- YOW
1 stop15h 23m
United Airlines
Deal found 3/15![United Airlines logo]()
$357
This United Airlines deal was found by Cheapflights users on 3/15. 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.
Wed 4/296:25 am
YOW
- MCI
1 stop9h 00m
United Airlines
Sun 5/36:17 am
MCI
- YOW
1 stop14h 18m
United Airlines
Deal found 3/15![United Airlines logo]()
$360
One-way flights from Ontario to MissouriSearch for one-way flight options from Ontario to Missouri. Find affordable one-way fares based on user searches. Data last updated March 17, 2026.
Search for one-way flight options from Ontario to Missouri. Find affordable one-way fares based on user searches. Data last updated March 17, 2026.
This United Airlines deal was found by Cheapflights users on 3/13. 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 4/285:25 pm
YOW
- STL
1 stop5h 27m
United Airlines
Deal found 3/13![United Airlines logo]()
$184
This United Airlines deal was found by Cheapflights users on 3/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3010:00 am
YOW
- STL
2 stops13h 45m
United Airlines
Deal found 3/16![United Airlines logo]()
$189
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
Thu 4/238:00 pm
YYZ
- STL
2 stops35h 50m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 3/13. 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 4/286:30 am
YYZ
- STL
2 stops25h 20m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$201
This Mytrip deal was found by Cheapflights users on 3/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/77:10 am
YYZ
- MCI
1 stop17h 43m
Multiple Airlines
Deal found 3/17![Multiple Airlines logo]()
$206
This Kiwi.com deal was found by Cheapflights users on 3/15. 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.
Wed 4/296:30 am
YYZ
- STL
2 stops28h 56m
Multiple Airlines
Deal found 3/15![Multiple Airlines logo]()
$208
This United Airlines deal was found by Cheapflights users on 3/15. 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.
Wed 4/296:10 am
YOW
- MCI
2 stops10h 53m
United Airlines
Deal found 3/15![United Airlines logo]()
$208
This United Airlines deal was found by Cheapflights users on 3/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:25 pm
YOW
- MCI
1 stop7h 06m
United Airlines
Deal found 3/17![United Airlines logo]()
$209
This Kiwi.com deal was found by Cheapflights users on 3/15. 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.
Mon 5/48:10 am
YYZ
- STL
2 stops34h 26m
Multiple Airlines
Deal found 3/15![Multiple Airlines logo]()
$210
This Kiwi.com deal was found by Cheapflights users on 3/15. 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.
Sun 5/38:10 am
YYZ
- STL
2 stops23h 40m
Multiple Airlines
Deal found 3/15![Multiple Airlines logo]()
$214
This Kiwi.com deal was found by Cheapflights users on 3/12. 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.
Sun 4/268:00 am
YUL
- STL
2 stops23h 50m
Multiple Airlines
Deal found 3/12![Multiple Airlines logo]()
$216
This Kiwi.com deal was found by Cheapflights users on 3/14. 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 4/196:30 am
YYZ
- STL
2 stops25h 20m
Multiple Airlines
Deal found 3/14![Multiple Airlines logo]()
$216
Find flight deals from Ontario to Missouri
Keep the following information in mind while searching for Ontario to Missouri flight deals. Data was last updated March 17, 2026.
Round-trip from | $291 (United Airlines) |
|---|---|
One-way from | $184 (United Airlines) |
Popular in | March |
Cheapest in | June |
Average price | $925 |
Good round-trip deal | $440 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 March 17, 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 4/14
6:25 am-9:13 pm
1 stop15h 48m
Lambert-St Louis
Mon 4/20
7:45 am-5:07 pm
1 stop8h 22m
$291
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Wed 4/15
5:25 pm-9:52 pm
1 stop5h 27m
Lambert-St Louis
Mon 4/20
7:45 am-5:07 pm
1 stop8h 22m
$291
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Fri 4/17
5:50 pm-11:57 pm
1 stop7h 07m
Lambert-St Louis
Sat 4/18
8:21 am-6:55 pm
2 stops9h 34m
$295
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Fri 5/22
5:20 pm-9:16 pm
1 stop4h 56m
Lambert-St Louis
Sun 5/24
1:13 pm-9:35 pm
1 stop7h 22m
$308
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Wed 6/3
10:44 am-9:16 pm
1 stop11h 32m
Lambert-St Louis
Sat 6/6
9:23 am-9:35 pm
1 stop11h 12m
$308
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Sat 4/11
6:00 am-2:24 pm
2 stops9h 24m
Lambert-St Louis
Sat 4/18
9:16 am-6:55 pm
2 stops8h 39m
$309
OttawaSt. Louis
YOW - STL
YOWSTL
Ottawa
Mon 4/27
10:44 am-9:13 pm
1 stop11h 29m
Lambert-St Louis
Mon 5/4
7:45 am-1:59 pm
1 stop5h 14m
$344
OttawaKansas City
YOW - MCI
YOWMCI
Ottawa
Thu 4/16
6:25 am-2:25 pm
1 stop9h 00m
Kansas City
Sat 4/18
11:30 am-5:07 pm
1 stop4h 37m
$344
OttawaKansas City
YOW - MCI
YOWMCI
Ottawa
Fri 6/5
7:30 pm-10:29 am
2 stops15h 59m
Kansas City
Wed 6/10
6:00 am-9:35 pm
1 stop14h 35m
$344
OttawaKansas City
YOW - MCI
YOWMCI
Ottawa
Wed 4/29
10:44 am-4:03 pm
1 stop6h 19m
Kansas City
Sat 5/2
5:40 pm-10:03 am
1 stop15h 23m
$344
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
YOW-MCI
YYZ-MCI
YYZ-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
YOW-STL
YOW-MCI
YYZ-MCI
YYZ-STL
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 $247). Flying from Region of Ontario to Missouri in April is currently the most expensive (average of $370). 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 March 17, 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Region of Ontario to Missouri as you normally would.
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 March 17, 2026.
The most flights from CAON to USMO are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).
Reviews of airlines servicing Missouri
Get insights into the airlines that provide service to Missouri. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Missouri. Reviews last updated March 17, 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
Entertainment
7.8
Comfort
7.9
Boarding
8.1
Overall
7.9
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Entertainment
7.8
Comfort
7.9
Boarding
8.1
Overall
7.9
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Entertainment
7.8
Comfort
7.9
Boarding
8.1
Overall
7.9
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Entertainment
7.8
Comfort
7.9
Boarding
8.1
Overall
7.9
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Entertainment
7.8
Comfort
7.9
Boarding
8.1
Overall
7.9
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
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.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Return Flight Options
Top destinations
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 March 17, 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 March 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$323 | Average$553 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$428 | Average$672 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$443 | Average$581 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$524 | Average$735 | FlexibilityNo cancel fee | On-time60% |