$62+ Cheap flights from Missouri to Ontario (ONT)
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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ONT
Sep 15 — Sep 221
Round-trip
1 adult, Economy
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Find cheap flights from Missouri to Ontario with Cheapflights
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Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from 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 August 16, 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 August 16, 2026.
This Expedia deal was found by Cheapflights users on 8/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/238:32 pm -
1 stop15h 58m
Tue 10/611:45 am -
1 stop5h 52m
Deal found 8/13![Frontier logo]()
$158
This Frontier deal was found by Cheapflights users on 8/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/268:32 pm -
1 stop5h 15m
Sat 10/311:45 am -
1 stop5h 52m
Deal found 8/12![Frontier logo]()
$159
This Frontier deal was found by Cheapflights users on 8/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1212:17 pm -
1 stop6h 17m
Sat 9/1911:45 am -
1 stop5h 32m
Deal found 8/13![Frontier logo]()
$168
This Booking.com deal was found by Cheapflights users on 8/12. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1512:17 pm -
1 stop6h 42m
Thu 9/178:00 am -
1 stop25h 27m
Deal found 8/12![Frontier logo]()
$174
This CheapOair deal was found by Cheapflights users on 8/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1010:20 am -
1 stop10h 19m
Thu 9/248:00 am -
1 stop25h 17m
Deal found 8/12![Frontier logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 8/16. 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.
Tue 10/272:17 pm -
1 stop25h 23m
Tue 11/172:35 pm -
1 stop20h 47m
Deal found 8/16![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 8/12. 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 9/51:38 pm -
1 stop12h 12m
Fri 9/1112:07 pm -
2 stops29h 30m
Deal found 8/12![Frontier logo]()
$181
This Frontier deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/18:32 pm -
1 stop5h 15m
Tue 10/66:15 am -
1 stop11h 22m
Deal found 8/11![Frontier logo]()
$182
This Frontier deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1710:30 pm -
1 stop10h 34m
Sat 9/1911:45 am -
1 stop5h 52m
Deal found 8/11![Frontier logo]()
$183
This Booking.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1512:17 pm -
1 stop6h 42m
Tue 9/2210:04 am -
1 stop23h 28m
Deal found 8/11![Frontier logo]()
$184
This Trip.com deal was found by Cheapflights users on 8/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:45 pm -
1 stop15h 18m
Tue 9/87:56 pm -
1 stop21h 21m
Deal found 8/12![Frontier logo]()
$186
This Booking.com deal was found by Cheapflights users on 8/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/268:32 pm -
1 stop5h 15m
Thu 10/16:15 am -
1 stop11h 22m
Deal found 8/14![Frontier logo]()
$188
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 August 16, 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 August 16, 2026.
This Southwest deal was found by Cheapflights users on 8/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/234:30 pm -
1 stop7h 35m
Sat 10/311:50 am -
1 stop5h 45m
Deal found 8/13![Southwest logo]()
$256
This Frontier deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/128:10 pm -
1 stop5h 45m
Sun 11/156:15 am -
1 stop11h 00m
Deal found 8/11![Frontier logo]()
$270
This Delta deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/28:00 am -
1 stop6h 16m
Sun 9/67:05 am -
1 stop7h 12m
Deal found 8/11![Delta logo]()
$357
This United Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/13:05 pm -
1 stop8h 54m
Sat 10/315:00 am -
1 stop5h 41m
Deal found 8/12![United Airlines logo]()
$366
This Alaska Airlines deal was found by Cheapflights users on 8/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:35 am -
1 stop9h 34m
Fri 9/117:12 am -
1 stop7h 58m
Deal found 8/16![Alaska Airlines logo]()
$395
This KAYAK deal was found by Cheapflights users on 8/13. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/25:42 am -
2 stops8h 21m
Sat 9/512:59 pm -
2 stops8h 43m
Deal found 8/13![American Airlines logo]()
$429
This Southwest deal was found by Cheapflights users on 8/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/225:05 am -
1 stop6h 20m
Mon 10/2611:55 pm -
1 stop8h 55m
Deal found 8/13![Southwest logo]()
$267
This Frontier deal was found by Cheapflights users on 8/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/188:10 pm -
1 stop5h 45m
Tue 10/206:00 am -
1 stop11h 15m
Deal found 8/13![Frontier logo]()
$293
This Southwest deal was found by Cheapflights users on 8/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/155:05 am -
1 stop6h 20m
Mon 10/1911:55 pm -
1 stop7h 20m
Deal found 8/13![Southwest logo]()
$267
This Frontier deal was found by Cheapflights users on 8/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/128:43 pm -
1 stop5h 07m
Mon 10/2611:52 am -
1 stop5h 56m
Deal found 8/15![Frontier logo]()
$326
This Delta deal was found by Cheapflights users on 8/16. 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.
Tue 9/18:00 am -
1 stop6h 16m
Wed 9/96:00 am -
1 stop5h 30m
Deal found 8/16![Delta logo]()
$377
This United Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/85:13 pm -
1 stop5h 40m
Tue 9/155:00 am -
1 stop5h 37m
Deal found 8/11![United Airlines logo]()
$383
This Delta deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/197:00 pm -
1 stop6h 55m
Thu 10/229:45 am -
1 stop5h 59m
Deal found 8/15![Delta logo]()
$377
This Alaska Airlines deal was found by Cheapflights users on 8/14. 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.
Sun 10/187:02 am -
1 stop8h 14m
Thu 10/222:13 pm -
1 stop7h 46m
Deal found 8/14![Alaska Airlines logo]()
$432
This United Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/103:05 pm -
1 stop8h 54m
Wed 9/165:00 am -
1 stop5h 56m
Deal found 8/11![United Airlines logo]()
$400
This Delta deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:00 pm -
1 stop7h 04m
Sun 9/2010:00 pm -
1 stop9h 00m
Deal found 8/12![Delta logo]()
$382
This Southwest deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/25:20 am -
2 stops9h 30m
Fri 10/162:40 pm -
2 stops7h 10m
Deal found 8/11![Southwest logo]()
$402
This Alaska Airlines deal was found by Cheapflights users on 8/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:35 am -
1 stop9h 34m
Thu 9/106:02 am -
1 stop10h 36m
Deal found 8/16![Alaska Airlines logo]()
$445
This United Airlines deal was found by Cheapflights users on 8/16. 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.
Sat 10/109:00 am -
1 stop5h 46m
Wed 10/141:24 pm -
1 stop5h 09m
Deal found 8/16![United Airlines logo]()
$418
This United Airlines deal was found by Cheapflights users on 8/16. 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.
Sat 10/103:19 pm -
1 stop9h 30m
Tue 10/131:22 pm -
1 stop5h 11m
Deal found 8/16![United Airlines logo]()
$418
This United Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/13:05 pm -
1 stop8h 54m
Mon 10/55:00 am -
1 stop5h 56m
Deal found 8/11![United Airlines logo]()
$423
This Southwest deal was found by Cheapflights users on 8/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2511:10 am -
2 stops6h 55m
Tue 9/18:30 am -
1 stop6h 55m
Deal found 8/16![Southwest logo]()
$469
This United Airlines deal was found by Cheapflights users on 8/12. 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 10/211:15 am -
2 stops13h 36m
Sat 10/31:22 pm -
1 stop5h 11m
Deal found 8/12![United Airlines logo]()
$424
This United Airlines deal was found by Cheapflights users on 8/14. 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 11/149:01 am -
1 stop5h 32m
Tue 11/179:25 am -
2 stops10h 12m
Deal found 8/14![United Airlines logo]()
$424
This United Airlines deal was found by Cheapflights users on 8/15. 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.
Sat 9/53:03 pm -
1 stop9h 32m
Sun 9/67:00 am -
1 stop9h 02m
Deal found 8/15![United Airlines logo]()
$429
This United Airlines deal was found by Cheapflights users on 8/13. 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 10/243:05 pm -
1 stop9h 46m
Wed 10/286:00 am -
1 stop6h 07m
Deal found 8/13![United Airlines logo]()
$429
This United Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/225:24 pm -
1 stop5h 34m
Sat 10/2411:10 am -
2 stops10h 05m
Deal found 8/12![United Airlines logo]()
$462
This United Airlines deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/253:05 pm -
1 stop8h 54m
Sun 10/46:00 am -
1 stop6h 16m
Deal found 8/14![United Airlines logo]()
$464
This United Airlines deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/171:53 pm -
2 stops10h 58m
Tue 9/227:00 am -
1 stop9h 46m
Deal found 8/14![United Airlines logo]()
$465
This United Airlines deal was found by Cheapflights users on 8/15. 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.
Mon 9/145:13 pm -
1 stop5h 40m
Tue 9/159:01 am -
2 stops12h 29m
Deal found 8/15![United Airlines logo]()
$466
Last-minute flights from Missouri to OntarioDiscover last-minute flight deals from Missouri to Ontario. Data last updated August 16, 2026 and is based on user searches.
Discover last-minute flight deals from Missouri to Ontario. Data last updated August 16, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/12. 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 9/51:38 pm -
1 stop12h 12m
Fri 9/1112:07 pm -
2 stops29h 30m
Deal found 8/12![Frontier logo]()
$181
This Trip.com deal was found by Cheapflights users on 8/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/56:45 pm -
1 stop15h 18m
Tue 9/87:56 pm -
1 stop21h 21m
Deal found 8/12![Frontier logo]()
$186
This CheapOair deal was found by Cheapflights users on 8/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1010:20 am -
1 stop10h 19m
Thu 9/248:00 am -
1 stop25h 17m
Deal found 8/12![Frontier logo]()
$178
This Frontier deal was found by Cheapflights users on 8/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/118:10 pm -
1 stop5h 37m
Sat 9/1911:45 am -
1 stop5h 32m
Deal found 8/12![Frontier logo]()
$204
This Frontier deal was found by Cheapflights users on 8/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1212:17 pm -
1 stop6h 17m
Sat 9/1911:45 am -
1 stop5h 32m
Deal found 8/13![Frontier logo]()
$168
This Booking.com deal was found by Cheapflights users on 8/12. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1512:17 pm -
1 stop6h 42m
Thu 9/178:00 am -
1 stop25h 27m
Deal found 8/12![Frontier logo]()
$174
This Frontier deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1710:30 pm -
1 stop10h 34m
Sat 9/1911:45 am -
1 stop5h 52m
Deal found 8/11![Frontier logo]()
$183
This Expedia deal was found by Cheapflights users on 8/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/238:32 pm -
1 stop15h 58m
Tue 10/611:45 am -
1 stop5h 52m
Deal found 8/13![Frontier logo]()
$158
This Kiwi.com deal was found by Cheapflights users on 8/15. 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.
Thu 9/248:32 pm -
1 stop15h 58m
Tue 9/296:15 am -
1 stop11h 22m
Deal found 8/15![Frontier logo]()
$198
This Frontier deal was found by Cheapflights users on 8/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/268:32 pm -
1 stop5h 15m
Sat 10/311:45 am -
1 stop5h 52m
Deal found 8/12![Frontier logo]()
$159
This Booking.com deal was found by Cheapflights users on 8/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/268:32 pm -
1 stop5h 15m
Thu 10/16:15 am -
1 stop11h 22m
Deal found 8/14![Frontier logo]()
$188
This Frontier deal was found by Cheapflights users on 8/13. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/298:32 pm -
1 stop5h 15m
Mon 10/1211:52 am -
1 stop5h 56m
Deal found 8/13![Frontier logo]()
$194
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 August 16, 2026.
Search for one-way flight options from Missouri to Ontario. Find affordable one-way fares based on user searches. Data last updated August 16, 2026.
This Trip.com deal was found by Cheapflights users on 8/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/182:17 pm -
1 stop11h 38m
Deal found 8/15![Frontier logo]()
$62
This Trip.com deal was found by Cheapflights users on 8/13. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/108:32 pm -
1 stop15h 58m
Deal found 8/13![Frontier logo]()
$65
This Trip.com deal was found by Cheapflights users on 8/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/298:32 pm -
1 stop15h 58m
Deal found 8/14![Frontier logo]()
$66
This Kiwi.com deal was found by Cheapflights users on 8/16. 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.
Sat 10/107:42 pm -
1 stop6h 08m
Deal found 8/16![Frontier logo]()
$75
This Trip.com deal was found by Cheapflights users on 8/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/312:17 pm -
1 stop11h 38m
Deal found 8/15![Frontier logo]()
$77
This Super.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/198:32 pm -
1 stop5h 15m
Deal found 8/11![Frontier logo]()
$78
This Frontier deal was found by Cheapflights users on 8/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/68:32 pm -
1 stop5h 15m
Deal found 8/12![Frontier logo]()
$79
This Trip.com deal was found by Cheapflights users on 8/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/238:32 pm -
1 stop15h 58m
Deal found 8/14![Frontier logo]()
$81
This Super.com deal was found by Cheapflights users on 8/12. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/238:10 pm -
1 stop5h 37m
Deal found 8/12![Frontier logo]()
$83
This Frontier deal was found by Cheapflights users on 8/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/912:17 pm -
1 stop6h 42m
Deal found 8/12![Frontier logo]()
$84
This Super.com deal was found by Cheapflights users on 8/13. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/112:17 pm -
1 stop22h 26m
Deal found 8/13![Frontier logo]()
$84
This Frontier deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/282:17 pm -
1 stop11h 38m
Deal found 8/11![Frontier logo]()
$85
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 August 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $158 (Expedia) |
One-way from | $62 (Trip.com) |
Popular in | June |
Cheapest in | September |
Average price | $379 |
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 2,558,603 searches. Data last updated August 16, 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
Kansas CityOntario
MCI Kansas City - ONT Ontario
MCIONT
Kansas City
Wed 9/23
4:30 pm-10:05 pm
1 stop7h 35m
Ontario
Sat 10/3
11:50 am-7:35 pm
1 stop5h 45m
$256
St. LouisOntario
STL Lambert-St Louis - ONT Ontario
STLONT
Lambert-St Louis
Thu 10/22
5:05 am-9:25 am
1 stop6h 20m
Ontario
Mon 10/26
11:55 pm-10:50 am
1 stop8h 55m
$267
St. LouisOntario
STL Lambert-St Louis - ONT Ontario
STLONT
Lambert-St Louis
Thu 10/15
5:05 am-9:25 am
1 stop6h 20m
Ontario
Mon 10/19
11:55 pm-9:15 am
1 stop7h 20m
$267
St. LouisOntario
STL Lambert-St Louis - ONT Ontario
STLONT
Lambert-St Louis
Thu 11/12
8:10 pm-11:55 pm
1 stop5h 45m
Ontario
Sun 11/15
6:15 am-7:15 pm
1 stop11h 00m
$270
St. LouisOntario
STL Lambert-St Louis - ONT Ontario
STLONT
Lambert-St Louis
Sun 10/18
8:10 pm-11:55 pm
1 stop5h 45m
Ontario
Tue 10/20
6:00 am-7:15 pm
1 stop11h 15m
$293
Kansas CityOntario
MCI Kansas City - ONT Ontario
MCIONT
Kansas City
Mon 10/12
8:43 pm-11:50 pm
1 stop5h 07m
Ontario
Mon 10/26
11:52 am-7:48 pm
1 stop5h 56m
$326
St. LouisOntario
STL Lambert-St Louis - ONT Ontario
STLONT
Lambert-St Louis
Wed 9/2
8:00 am-12:16 pm
1 stop6h 16m
Ontario
Sun 9/6
7:05 am-4:17 pm
1 stop7h 12m
$357
SpringfieldOntario
SGF Springfield-Branson - ONT Ontario
SGFONT
Springfield-Branson
Thu 10/1
3:05 pm-9:59 pm
1 stop8h 54m
Ontario
Sat 10/31
5:00 am-12:41 pm
1 stop5h 41m
$366
St. LouisOntario
STL Lambert-St Louis - ONT Ontario
STLONT
Lambert-St Louis
Tue 9/1
8:00 am-12:16 pm
1 stop6h 16m
Ontario
Wed 9/9
6:00 am-1:30 pm
1 stop5h 30m
$377
St. LouisOntario
STL Lambert-St Louis - ONT Ontario
STLONT
Lambert-St Louis
Mon 10/19
7:00 pm-11:55 pm
1 stop6h 55m
Ontario
Thu 10/22
9:45 am-5:44 pm
1 stop5h 59m
$377
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.
MCI-ONT
STL-ONT
SGF-ONT
COU-ONT
JLN-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
MCI-ONT
STL-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 $335). Flying from Missouri to Ontario in June is currently the most expensive (average of $481). 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 $284 and $436 in September.The cheapest round-trip price found within the last 5 days was $168 on Frontier (Sep 12-Sep 19).
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
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Ontario flight routes
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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 August 16, 2026.
Missouri and Ontario flights
Browse other Missouri and Ontario flight options. Last updated on August 16, 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 2,558,603 searches. Data last updated August 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$125 | Average$290 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$201 | Average$421 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$248 | Average$454 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$292 | Average$436 | FlexibilityNo cancel fee | On-time63% |