$67+ Cheap flights from Missouri to Ontario (ONT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ONT
Oct 28 — Nov 41
Round-trip
1 adult, Economy
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Find cheap flights from Missouri to Ontario with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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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 Missouri to Ontario
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Cheapest flights from Missouri to OntarioExplore the most affordable flight options available from Missouri to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 28, 2026.
Explore the most affordable flight options available from Missouri to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 28, 2026.
This Mytrip deal was found by Cheapflights users on 9/24. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/248:43 pm -
1 stop5h 07m
Sat 10/3111:52 am -
1 stop5h 55m
Deal found 9/24![Frontier logo]()
$147
This Mytrip deal was found by Cheapflights users on 9/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/218:43 pm -
1 stop5h 07m
Wed 10/286:25 am -
1 stop11h 22m
Deal found 9/23![Frontier logo]()
$159
This Mytrip deal was found by Cheapflights users on 9/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:42 pm -
1 stop6h 08m
Sat 11/146:25 am -
1 stop10h 49m
Deal found 9/23![Frontier logo]()
$162
This Booking.com deal was found by Cheapflights users on 9/23. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/168:43 pm -
1 stop15h 52m
Wed 11/1811:52 am -
1 stop5h 55m
Deal found 9/23![Frontier logo]()
$165
This Mytrip deal was found by Cheapflights users on 9/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:42 pm -
1 stop6h 08m
Sat 10/316:25 am -
1 stop10h 49m
Deal found 9/23![Frontier logo]()
$171
This Booking.com deal was found by Cheapflights users on 9/23. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/268:00 pm -
1 stop16h 35m
Tue 11/1711:52 am -
1 stop25h 31m
Deal found 9/23![Frontier logo]()
$176
This Trip.com deal was found by Cheapflights users on 9/25. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/317:59 pm -
1 stop5h 52m
Wed 11/46:25 am -
1 stop6h 58m
Deal found 9/25![Frontier logo]()
$179
This Trip.com deal was found by Cheapflights users on 9/23. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/108:32 pm -
1 stop5h 48m
Sat 12/126:00 am -
1 stop11h 35m
Deal found 9/23![Frontier logo]()
$180
This Trip.com deal was found by Cheapflights users on 9/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:42 pm -
1 stop6h 08m
Tue 12/16:00 am -
1 stop27h 06m
Deal found 9/27![Frontier logo]()
$184
This Trip.com deal was found by Cheapflights users on 9/24. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/18:29 pm -
1 stop16h 16m
Sat 12/126:00 am -
1 stop11h 35m
Deal found 9/24![Frontier logo]()
$192
This Booking.com deal was found by Cheapflights users on 9/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/307:59 pm -
1 stop16h 43m
Tue 11/311:52 am -
1 stop25h 31m
Deal found 9/27![Frontier logo]()
$193
This Booking.com deal was found by Cheapflights users on 9/26. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/108:43 pm -
1 stop5h 08m
Sat 11/1411:52 am -
1 stop5h 55m
Deal found 9/26![Frontier logo]()
$195
Best flights from Missouri to OntarioDiscover carefully curated flight deals from Missouri to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 28, 2026.
Discover carefully curated flight deals from Missouri to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 28, 2026.
This Booking.com deal was found by Cheapflights users on 9/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/307:59 pm -
1 stop16h 43m
Tue 11/311:52 am -
1 stop25h 31m
Deal found 9/27![Frontier logo]()
$193
This Southwest deal was found by Cheapflights users on 9/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/126:20 am -
1 stop5h 30m
Thu 12/174:00 pm -
1 stop6h 15m
Deal found 9/27![Southwest logo]()
$352
This Delta deal was found by Cheapflights users on 9/25. 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.
Mon 10/267:00 pm -
1 stop6h 55m
Thu 10/295:03 pm -
1 stop5h 41m
Deal found 9/25![Delta logo]()
$357
This United Airlines deal was found by Cheapflights users on 9/23. 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.
Wed 10/214:53 pm -
1 stop7h 06m
Wed 10/289:25 am -
2 stops10h 30m
Deal found 9/23![United Airlines logo]()
$364
This Alaska Airlines deal was found by Cheapflights users on 9/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/207:02 am -
1 stop8h 14m
Tue 10/272:13 pm -
1 stop7h 46m
Deal found 9/27![Alaska Airlines logo]()
$384
This American Airlines deal was found by Cheapflights users on 9/23. 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.
Fri 1/86:50 am -
2 stops10h 39m
Wed 1/137:00 am -
1 stop7h 36m
Deal found 9/23![American Airlines logo]()
$424
This Mytrip deal was found by Cheapflights users on 9/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:42 pm -
2 stops17h 34m
Sat 10/316:25 am -
1 stop10h 49m
Deal found 9/23![Frontier logo]()
$225
This Mytrip deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” 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.
Thu 10/228:43 pm -
2 stops16h 33m
Wed 10/2811:52 am -
1 stop5h 55m
Deal found 9/28![Frontier logo]()
$324
This Delta deal was found by Cheapflights users on 9/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:45 am -
1 stop6h 51m
Sat 10/3112:16 pm -
1 stop7h 43m
Deal found 9/23![Delta logo]()
$357
This Southwest deal was found by Cheapflights users on 9/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:30 am -
1 stop5h 15m
Tue 10/274:15 pm -
1 stop5h 25m
Deal found 9/27![Southwest logo]()
$371
This CheapOair deal was found by Cheapflights users on 9/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/147:54 pm -
1 stop28h 23m
Sat 12/1910:32 pm -
1 stop14h 25m
Deal found 9/25![Frontier logo]()
$335
This Delta deal was found by Cheapflights users on 9/24. 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.
Thu 10/157:45 am -
1 stop6h 51m
Wed 10/216:00 am -
1 stop6h 05m
Deal found 9/24![Delta logo]()
$370
This Delta deal was found by Cheapflights users on 9/24. 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 12/96:02 pm -
1 stop7h 55m
Sat 12/121:11 pm -
1 stop5h 31m
Deal found 9/24![Delta logo]()
$371
This United Airlines deal was found by Cheapflights users on 9/27. 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.
Thu 10/84:53 pm -
1 stop7h 06m
Thu 10/295:00 am -
2 stops11h 05m
Deal found 9/27![United Airlines logo]()
$454
This United Airlines deal was found by Cheapflights users on 9/23. 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.
Sat 11/1411:20 am -
1 stop9h 27m
Tue 11/179:25 am -
2 stops11h 33m
Deal found 9/23![United Airlines logo]()
$464
This Delta deal was found by Cheapflights users on 9/23. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/67:45 am -
1 stop6h 51m
Mon 11/911:10 pm -
1 stop7h 50m
Deal found 9/23![Delta logo]()
$394
This American Airlines deal was found by Cheapflights users on 9/23. 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 10/175:14 pm -
1 stop5h 57m
Fri 10/232:22 pm -
1 stop5h 31m
Deal found 9/23![American Airlines logo]()
$528
This United Airlines deal was found by Cheapflights users on 9/26. 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.
Fri 1/223:10 pm -
1 stop8h 30m
Fri 1/295:00 am -
1 stop5h 52m
Deal found 9/26![United Airlines logo]()
$469
This Delta deal was found by Cheapflights users on 9/25. 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 10/277:45 am -
1 stop6h 51m
Fri 10/309:45 am -
1 stop5h 59m
Deal found 9/25![Delta logo]()
$394
This Frontier deal was found by Cheapflights users on 9/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/228:43 pm -
1 stop5h 07m
Mon 10/268:00 am -
2 stops9h 48m
Deal found 9/26![Frontier logo]()
$469
This United Airlines deal was found by Cheapflights users on 9/26. 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.
Thu 1/74:53 pm -
1 stop6h 47m
Tue 1/126:00 am -
1 stop8h 03m
Deal found 9/26![United Airlines logo]()
$469
This Delta deal was found by Cheapflights users on 9/24. 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 12/96:02 pm -
1 stop7h 55m
Fri 12/1111:08 pm -
1 stop8h 21m
Deal found 9/24![Delta logo]()
$398
This United Airlines deal was found by Cheapflights users on 9/27. 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 11/145:02 pm -
1 stop5h 49m
Tue 11/177:00 am -
1 stop9h 05m
Deal found 9/27![United Airlines logo]()
$469
This Cheapflightsfares deal was found by Cheapflights users on 9/26. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/512:17 pm -
1 stop22h 52m
Sun 10/118:35 pm -
1 stop14h 00m
Deal found 9/26![Frontier logo]()
$505
This Delta deal was found by Cheapflights users on 9/24. 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 12/96:02 pm -
1 stop7h 55m
Sun 12/1311:08 pm -
1 stop8h 21m
Deal found 9/24![Delta logo]()
$424
This United Airlines deal was found by Cheapflights users on 9/27. 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 10/213:43 pm -
1 stop9h 06m
Sat 10/248:03 am -
2 stops10h 30m
Deal found 9/27![United Airlines logo]()
$499
This Delta deal was found by Cheapflights users on 9/27. 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 3/187:40 pm -
1 stop6h 08m
Sat 3/2712:00 pm -
1 stop9h 58m
Deal found 9/27![Delta logo]()
$435
This Delta deal was found by Cheapflights users on 9/25. 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 10/247:45 am -
1 stop6h 51m
Sun 10/255:03 pm -
1 stop5h 41m
Deal found 9/25![Delta logo]()
$476
This Delta deal was found by Cheapflights users on 9/27. 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 3/187:40 pm -
1 stop6h 08m
Sun 3/287:00 am -
1 stop8h 32m
Deal found 9/27![Delta logo]()
$477
This Delta deal was found by Cheapflights users on 9/27. 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.
Fri 3/195:40 am -
1 stop7h 47m
Sun 3/287:00 am -
1 stop8h 32m
Deal found 9/27![Delta logo]()
$477
Last-minute flights from Missouri to OntarioDiscover last-minute flight deals from Missouri to Ontario. Data last updated September 28, 2026 and is based on user searches.
Discover last-minute flight deals from Missouri to Ontario. Data last updated September 28, 2026 and is based on user searches.
This Booking.com deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/198:00 pm -
1 stop16h 29m
Wed 10/216:15 am -
1 stop7h 09m
Deal found 9/28![Frontier logo]()
$181
This Mytrip deal was found by Cheapflights users on 9/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/218:43 pm -
1 stop5h 07m
Wed 10/286:25 am -
1 stop11h 22m
Deal found 9/23![Frontier logo]()
$159
This Mytrip deal was found by Cheapflights users on 9/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/218:43 pm -
1 stop5h 07m
Mon 10/268:35 pm -
2 stops21h 12m
Deal found 9/23![Frontier logo]()
$204
This Mytrip deal was found by Cheapflights users on 9/24. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/248:43 pm -
1 stop5h 07m
Sat 10/3111:52 am -
1 stop5h 55m
Deal found 9/24![Frontier logo]()
$147
This Mytrip deal was found by Cheapflights users on 9/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:42 pm -
1 stop6h 08m
Sat 11/146:25 am -
1 stop10h 49m
Deal found 9/23![Frontier logo]()
$162
This Mytrip deal was found by Cheapflights users on 9/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:42 pm -
1 stop6h 08m
Wed 10/286:25 am -
1 stop6h 58m
Deal found 9/25![Frontier logo]()
$171
This Trip.com deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:42 pm -
1 stop6h 08m
Tue 12/16:00 am -
1 stop27h 06m
Deal found 9/28![Frontier logo]()
$184
This Booking.com deal was found by Cheapflights users on 9/23. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/268:00 pm -
1 stop16h 35m
Tue 11/1711:52 am -
1 stop25h 31m
Deal found 9/23![Frontier logo]()
$176
This Cheapflightsfares deal was found by Cheapflights users on 9/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/268:00 pm -
1 stop5h 50m
Wed 10/286:25 am -
1 stop6h 58m
Deal found 9/23![Frontier logo]()
$203
This Booking.com deal was found by Cheapflights users on 9/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/307:59 pm -
1 stop16h 43m
Tue 11/311:52 am -
1 stop25h 31m
Deal found 9/27![Frontier logo]()
$193
This Mytrip deal was found by Cheapflights users on 9/24. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/308:43 pm -
1 stop15h 59m
Mon 11/28:03 pm -
2 stops21h 44m
Deal found 9/24![Frontier logo]()
$218
This Trip.com deal was found by Cheapflights users on 9/25. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/317:59 pm -
1 stop5h 52m
Wed 11/46:25 am -
1 stop6h 58m
Deal found 9/25![Frontier logo]()
$179
One-way flights from Missouri to OntarioSearch for one-way flight options from Missouri to Ontario. Find affordable one-way fares based on user searches. Data last updated September 28, 2026.
Search for one-way flight options from Missouri to Ontario. Find affordable one-way fares based on user searches. Data last updated September 28, 2026.
This Trip.com deal was found by Cheapflights users on 9/23. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/208:43 pm -
1 stop15h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$67
This Mytrip deal was found by Cheapflights users on 9/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/108:43 pm -
1 stop15h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$75
This Super.com deal was found by Cheapflights users on 9/23. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/218:43 pm -
1 stop5h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$76
This Mytrip deal was found by Cheapflights users on 9/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/138:43 pm -
1 stop15h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$77
This Trip.com deal was found by Cheapflights users on 9/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/214:19 pm -
1 stop9h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$83
This Booking.com deal was found by Cheapflights users on 9/23. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/158:43 pm -
1 stop5h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$83
This Super.com deal was found by Cheapflights users on 9/24. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/178:43 pm -
1 stop5h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Frontier logo]()
$86
This Mytrip deal was found by Cheapflights users on 9/24. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/238:43 pm -
1 stop15h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 9/25. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/317:59 pm -
1 stop5h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Frontier logo]()
$91
This Trip.com deal was found by Cheapflights users on 9/24. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/18:29 pm -
1 stop16h 16m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Frontier logo]()
$91
This Super.com deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/213:04 pm -
1 stop11h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$97
This Mytrip deal was found by Cheapflights users on 9/26. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/248:43 pm -
1 stop5h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Frontier logo]()
$97
Find flight deals from Missouri to Ontario
Keep the following information in mind while searching for Missouri to Ontario flight deals. Data was last updated September 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $147 (Mytrip) |
One-way from | $67 (Trip.com) |
Popular in | August |
Cheapest in | February |
Average price | $430 |
Cheapflights Fare Finder
Customize your flight search to find flights from Missouri to Ontario 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 7,457,451 searches. Data last updated September 28, 2026.
Use the filters below to find and compare flights from Missouri to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisOntario
STL Lambert-St Louis - ONT Ontario
STLONT
Lambert-St Louis
Wed 10/21
4:19 pm-7:40 pm
2 stops29h 21m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$137
St. LouisOntario
STL Lambert-St Louis - ONT Ontario
STLONT
Lambert-St Louis
Wed 11/11
4:18 pm-11:16 am
2 stops20h 58m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$148
Kansas CityOntario
MCI Kansas City - ONT Ontario
MCIONT
Kansas City
Tue 11/24
8:29 pm-12:14 am
1 stop5h 45m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$154
St. LouisOntario
STL Lambert-St Louis - ONT Ontario
STLONT
Lambert-St Louis
Sat 11/21
3:04 pm-12:29 am
2 stops11h 25m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$169
Kansas CityOntario
MCI Kansas City - ONT Ontario
MCIONT
Kansas City
Fri 10/9
8:43 pm-10:29 am
1 stop15h 46m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$173
St. LouisOntario
STL Lambert-St Louis - ONT Ontario
STLONT
Lambert-St Louis
Mon 11/30
6:35 pm-10:45 am
2 stops18h 10m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$181
St. LouisOntario
STL Lambert-St Louis - ONT Ontario
STLONT
Lambert-St Louis
Wed 11/25
3:04 pm-10:45 am
1 stop21h 41m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$185
Kansas CityOntario
MCI Kansas City - ONT Ontario
MCIONT
Kansas City
Thu 2/25
5:40 am-11:27 am
1 stop7h 47m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$186
Kansas CityOntario
MCI Kansas City - ONT Ontario
MCIONT
Kansas City
Wed 12/2
7:00 am-12:17 pm
1 stop7h 17m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$186
Kansas CityOntario
MCI Kansas City - ONT Ontario
MCIONT
Kansas City
Thu 10/29
5:59 pm-11:55 pm
1 stop7h 56m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$186
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Missouri to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Missouri with our price prediction graph.
STL-ONT
MCI-ONT
SGF-ONT
COU-ONT
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 Missouri to Ontario
USMO-ONT
STL-ONT
MCI-ONT
SGF-ONT
COU-ONT
What is the cheapest month to book a flight from Missouri to Ontario?
Currently, October is the cheapest month in which you can book a flight from Missouri to Ontario (average of $322). Flying from Missouri to Ontario in June is currently the most expensive (average of $478). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from Missouri to Ontario?
Airfare is below average for this route at the moment.
Missouri to Ontario flights typically cost between $288 and $473 in October.The cheapest round-trip price found within the last 5 days was $162 on Frontier (Oct 24-Nov 14).
Related info for your journey
Find useful and relevant information for your journey from Missouri to Ontario. 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
Ontario flight routes
Other flight options
Popular flights
Top destinations
Alternative routes for Missouri to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Missouri to Ontario by cabin class
Find flights from Missouri to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 28, 2026.
Missouri and Ontario flights
Browse other Missouri and Ontario flight options. Last updated on September 28, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Missouri to Ontario flights
Consider these flights traveling from Missouri to Ontario.
Top 4 airlines flying from Missouri to Ontario
Discover the top 4 airlines that operate flights from Missouri to Ontario. 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 7,457,451 searches. Data last updated September 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$125 | Average$294 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$253 | Average$436 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$256 | Average$448 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$292 | Average$450 | FlexibilityNo cancel fee | On-time71% |