$84+ Cheap flights from Ontario (ONT) to Missouri
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STL
Sep 24 — Oct 11
Round-trip
1 adult, Economy
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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
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Cheapest flights from Ontario to MissouriExplore the most affordable flight options available from Ontario to Missouri. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 25, 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 August 25, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” 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 9/166:15 am -
1 stop11h 02m
Wed 9/238:10 pm -
1 stop16h 20m
Deal found 8/21![Frontier logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” 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 10/286:25 am -
1 stop6h 58m
Wed 11/44:18 pm -
1 stop9h 33m
Deal found 8/21![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” 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 10/76:15 am -
1 stop11h 02m
Wed 10/144:19 pm -
1 stop9h 31m
Deal found 8/21![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2911:45 am -
1 stop5h 52m
Wed 9/308:32 pm -
1 stop15h 58m
Deal found 8/21![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1511:52 am -
1 stop29h 23m
Mon 10/198:00 pm -
1 stop16h 29m
Deal found 8/20![Frontier logo]()
$183
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” 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 10/286:25 am -
1 stop6h 58m
Fri 10/307:59 pm -
1 stop29h 52m
Deal found 8/21![Frontier logo]()
$184
This Kiwi.com deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:15 am -
1 stop11h 33m
Tue 10/138:43 pm -
1 stop29h 07m
Deal found 8/22![Frontier logo]()
$184
This Kiwi.com deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:15 am -
1 stop11h 33m
Mon 10/128:43 pm -
1 stop15h 46m
Deal found 8/22![Frontier logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1511:45 am -
2 stops23h 25m
Fri 9/188:10 pm -
1 stop29h 37m
Deal found 8/25![Frontier logo]()
$195
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/226:15 am -
1 stop11h 22m
Thu 9/248:32 pm -
1 stop15h 58m
Deal found 8/23![Frontier logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1611:52 am -
1 stop5h 56m
Mon 10/198:43 pm -
1 stop15h 46m
Deal found 8/21![Frontier logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2211:45 am -
2 stops21h 47m
Mon 9/288:10 pm -
1 stop16h 20m
Deal found 8/20![Frontier logo]()
$205
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 August 25, 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 August 25, 2026.
This Frontier deal was found by Cheapflights users on 8/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:15 am -
1 stop11h 22m
Wed 9/238:32 pm -
1 stop5h 15m
Deal found 8/25![Frontier logo]()
$272
This United Airlines deal was found by Cheapflights users on 8/23. 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 10/248:03 am -
2 stops10h 30m
Tue 11/38:00 am -
2 stops14h 15m
Deal found 8/23![United Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1112:17 pm -
1 stop7h 51m
Wed 9/236:08 am -
1 stop7h 01m
Deal found 8/21![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” 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 10/76:50 am -
2 stops8h 55m
Wed 10/142:25 pm -
2 stops8h 20m
Deal found 8/21![Southwest logo]()
$377
This Alaska Airlines deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” 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.
Fri 10/95:45 pm -
2 stops21h 33m
Tue 10/136:14 pm -
1 stop18h 35m
Deal found 8/21![Alaska Airlines logo]()
$462
This Frontier deal was found by Cheapflights users on 8/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1711:45 am -
1 stop5h 52m
Wed 9/238:32 pm -
1 stop5h 15m
Deal found 8/25![Frontier logo]()
$272
This Frontier deal was found by Cheapflights users on 8/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:15 am -
1 stop11h 22m
Tue 9/228:32 pm -
1 stop5h 15m
Deal found 8/25![Frontier logo]()
$272
This American Airlines deal was found by Cheapflights users on 8/24. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/147:34 pm -
2 stops12h 27m
Mon 10/195:14 pm -
2 stops7h 39m
Deal found 8/24![American Airlines logo]()
$618
This Frontier deal was found by Cheapflights users on 8/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1511:45 am -
1 stop5h 52m
Wed 9/238:32 pm -
1 stop5h 15m
Deal found 8/25![Frontier logo]()
$272
This Delta deal was found by Cheapflights users on 8/24. 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.
Mon 10/125:03 pm -
1 stop5h 41m
Thu 10/157:00 pm -
1 stop6h 55m
Deal found 8/24![Delta logo]()
$357
This Frontier deal was found by Cheapflights users on 8/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1811:45 am -
1 stop5h 52m
Wed 9/238:32 pm -
1 stop5h 15m
Deal found 8/25![Frontier logo]()
$288
This Southwest deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” 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.
Mon 9/144:50 pm -
1 stop5h 05m
Fri 9/255:15 am -
1 stop6h 00m
Deal found 8/21![Southwest logo]()
$395
This Delta deal was found by Cheapflights users on 8/24. 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.
Mon 11/235:04 pm -
1 stop5h 13m
Tue 12/16:02 pm -
1 stop7h 56m
Deal found 8/24![Delta logo]()
$371
This United Airlines deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” 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 10/311:29 pm -
1 stop5h 12m
Wed 11/48:00 am -
2 stops14h 15m
Deal found 8/21![United Airlines logo]()
$424
This Southwest deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” 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 10/286:50 am -
2 stops8h 55m
Fri 10/302:25 pm -
2 stops8h 55m
Deal found 8/20![Southwest logo]()
$395
This Frontier deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” 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 10/2911:52 am -
1 stop5h 55m
Sun 11/18:43 pm -
1 stop5h 08m
Deal found 8/22![Frontier logo]()
$305
This Alaska Airlines deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” 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 10/137:25 am -
2 stops14h 21m
Mon 10/193:20 pm -
2 stops20h 57m
Deal found 8/22![Alaska Airlines logo]()
$468
This United Airlines deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/61:00 pm -
1 stop5h 34m
Tue 2/93:10 pm -
1 stop8h 11m
Deal found 8/24![United Airlines logo]()
$429
This Delta deal was found by Cheapflights users on 8/23. 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.
Tue 9/2212:17 pm -
1 stop9h 25m
Fri 9/256:55 pm -
1 stop6h 52m
Deal found 8/23![Delta logo]()
$396
This Southwest deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” 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.
Mon 10/126:10 am -
2 stops8h 50m
Thu 10/155:05 am -
1 stop6h 20m
Deal found 8/20![Southwest logo]()
$440
This United Airlines deal was found by Cheapflights users on 8/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:00 am -
1 stop6h 10m
Mon 10/53:12 pm -
1 stop8h 47m
Deal found 8/24![United Airlines logo]()
$457
This Delta deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” 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 9/2312:19 pm -
1 stop7h 49m
Tue 9/293:19 pm -
1 stop7h 05m
Deal found 8/22![Delta logo]()
$419
This Southwest deal was found by Cheapflights users on 8/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1410:55 am -
2 stops6h 50m
Sun 10/185:00 am -
2 stops9h 05m
Deal found 8/23![Southwest logo]()
$459
This United Airlines deal was found by Cheapflights users on 8/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/141:33 pm -
1 stop6h 41m
Mon 1/184:30 pm -
1 stop6h 51m
Deal found 8/25![United Airlines logo]()
$461
This Delta deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” 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 10/911:15 pm -
1 stop9h 36m
Sun 10/116:00 am -
1 stop7h 06m
Deal found 8/21![Delta logo]()
$450
This United Airlines deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/221:18 pm -
1 stop5h 20m
Wed 9/239:43 am -
2 stops12h 18m
Deal found 8/23![United Airlines logo]()
$462
This United Airlines deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” 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 10/248:03 am -
2 stops12h 32m
Thu 10/299:49 am -
2 stops12h 26m
Deal found 8/22![United Airlines logo]()
$472
This United Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” 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 9/105:00 am -
1 stop5h 38m
Fri 9/119:52 am -
2 stops12h 09m
Deal found 8/20![United Airlines logo]()
$477
This United Airlines deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” 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 9/191:18 pm -
1 stop5h 11m
Sat 9/263:05 pm -
1 stop8h 54m
Deal found 8/22![United Airlines logo]()
$529
This United Airlines deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” 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 10/101:52 pm -
2 stops7h 50m
Thu 10/155:30 am -
2 stops8h 48m
Deal found 8/22![United Airlines logo]()
$530
Last-minute flights from Ontario to MissouriDiscover last-minute flight deals from Ontario to Missouri. Data last updated August 25, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Missouri. Data last updated August 25, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” 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 9/126:15 am -
1 stop11h 02m
Sat 9/198:10 pm -
1 stop5h 37m
Deal found 8/21![Frontier logo]()
$228
This Vliegwinkel deal was found by Cheapflights users on 8/24. 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 Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/146:15 am -
1 stop11h 22m
Tue 9/228:32 pm -
1 stop5h 15m
Deal found 8/24![Frontier logo]()
$219
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/146:15 am -
1 stop11h 02m
Fri 9/258:10 pm -
1 stop16h 20m
Deal found 8/21![Frontier logo]()
$233
This Kiwi.com deal was found by Cheapflights users on 8/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1511:45 am -
2 stops23h 25m
Fri 9/188:10 pm -
1 stop29h 37m
Deal found 8/25![Frontier logo]()
$195
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” 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 9/166:15 am -
1 stop11h 02m
Wed 9/238:10 pm -
1 stop16h 20m
Deal found 8/21![Frontier logo]()
$156
This Vliegwinkel deal was found by Cheapflights users on 8/25. 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 Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:15 am -
1 stop11h 22m
Wed 9/238:32 pm -
1 stop5h 15m
Deal found 8/25![Frontier logo]()
$240
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:15 am -
1 stop11h 22m
Tue 9/228:32 pm -
2 stops22h 27m
Deal found 8/23![Frontier logo]()
$228
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/226:15 am -
1 stop11h 22m
Thu 9/248:32 pm -
1 stop15h 58m
Deal found 8/23![Frontier logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2211:45 am -
2 stops21h 47m
Mon 9/288:10 pm -
1 stop16h 20m
Deal found 8/20![Frontier logo]()
$205
This Trip.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” 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 9/236:15 am -
1 stop11h 02m
Mon 9/288:10 pm -
1 stop16h 20m
Deal found 8/21![Frontier logo]()
$234
This Trip.com deal was found by Cheapflights users on 8/24. 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.
Wed 9/236:15 am -
1 stop11h 02m
Sat 9/268:10 pm -
1 stop5h 37m
Deal found 8/24![Frontier logo]()
$235
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2911:45 am -
1 stop5h 52m
Wed 9/308:32 pm -
1 stop15h 58m
Deal found 8/21![Frontier logo]()
$180
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 August 25, 2026.
Search for one-way flight options from Ontario to Missouri. Find affordable one-way fares based on user searches. Data last updated August 25, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/146:15 am -
1 stop11h 02m
Deal found 8/23![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” 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 9/196:15 am -
1 stop11h 22m
Deal found 8/22![Frontier logo]()
$89
This Trip.com deal was found by Cheapflights users on 8/24. 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.
Wed 9/306:15 am -
1 stop11h 22m
Deal found 8/24![Frontier logo]()
$92
This Trip.com deal was found by Cheapflights users on 8/24. 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.
Sat 11/76:25 am -
1 stop11h 22m
Deal found 8/24![Frontier logo]()
$93
This Trip.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” 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 9/296:15 am -
1 stop11h 22m
Deal found 8/21![Frontier logo]()
$94
This Trip.com deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” 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 10/16:15 am -
1 stop11h 22m
Deal found 8/22![Frontier logo]()
$97
This Trip.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” 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 9/236:15 am -
1 stop11h 22m
Deal found 8/20![Frontier logo]()
$98
This Trip.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” 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 10/106:15 am -
1 stop11h 33m
Deal found 8/20![Frontier logo]()
$103
This Trip.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” 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 11/106:25 am -
1 stop11h 22m
Deal found 8/20![Frontier logo]()
$104
This Trip.com deal was found by Cheapflights users on 8/24. 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 10/206:15 am -
1 stop11h 33m
Deal found 8/24![Frontier logo]()
$109
This Trip.com deal was found by Cheapflights users on 8/22. Clicking the “Pick Dates” 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 9/266:15 am -
1 stop11h 22m
Deal found 8/22![Frontier logo]()
$110
This Kiwi.com deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2211:45 am -
2 stops23h 25m
Deal found 8/21![Frontier logo]()
$115
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 August 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $156 (Kiwi.com) |
One-way from | $84 (Kiwi.com) |
Popular in | July |
Cheapest in | September |
Average price | $389 |
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 7,457,451 searches. Data last updated August 25, 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
OntarioKansas City
ONT Ontario - MCI Kansas City
ONTMCI
Ontario
Wed 9/16
6:15 am-7:37 pm
1 stop11h 22m
Kansas City
Wed 9/23
8:32 pm-11:47 pm
1 stop5h 15m
$272
OntarioKansas City
ONT Ontario - MCI Kansas City
ONTMCI
Ontario
Thu 9/17
11:45 am-7:37 pm
1 stop5h 52m
Kansas City
Wed 9/23
8:32 pm-11:47 pm
1 stop5h 15m
$272
OntarioKansas City
ONT Ontario - MCI Kansas City
ONTMCI
Ontario
Wed 9/16
6:15 am-7:37 pm
1 stop11h 22m
Kansas City
Tue 9/22
8:32 pm-11:47 pm
1 stop5h 15m
$272
OntarioKansas City
ONT Ontario - MCI Kansas City
ONTMCI
Ontario
Tue 9/15
11:45 am-7:37 pm
1 stop5h 52m
Kansas City
Wed 9/23
8:32 pm-11:47 pm
1 stop5h 15m
$272
OntarioKansas City
ONT Ontario - MCI Kansas City
ONTMCI
Ontario
Fri 9/18
11:45 am-7:37 pm
1 stop5h 52m
Kansas City
Wed 9/23
8:32 pm-11:47 pm
1 stop5h 15m
$288
Quickest round-trip
OntarioKansas City
ONT Ontario - MCI Kansas City
ONTMCI
Ontario
Thu 10/29
11:52 am-7:47 pm
1 stop5h 55m
Kansas City
Sun 11/1
8:43 pm-11:51 pm
1 stop5h 08m
$305
OntarioColumbia
ONT Ontario - COU Columbia Regional
ONTCOU
Ontario
Sat 10/24
8:03 am-8:33 pm
2 stops10h 30m
Columbia Regional
Tue 11/3
8:00 am-8:15 pm
2 stops14h 15m
$339
OntarioSpringfield
ONT Ontario - SGF Springfield-Branson
ONTSGF
Ontario
Fri 9/11
12:17 pm-10:08 pm
1 stop7h 51m
Springfield-Branson
Wed 9/23
6:08 am-11:09 am
1 stop7h 01m
$339
OntarioSt. Louis
ONT Ontario - STL Lambert-St Louis
ONTSTL
Ontario
Mon 10/12
5:03 pm-12:44 am
1 stop5h 41m
Lambert-St Louis
Thu 10/15
7:00 pm-11:55 pm
1 stop6h 55m
$357
OntarioKansas City
ONT Ontario - MCI Kansas City
ONTMCI
Ontario
Mon 11/23
5:04 pm-12:17 am
1 stop5h 13m
Kansas City
Tue 12/1
6:02 pm-11:58 pm
1 stop7h 56m
$371
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.
ONT-STL
ONT-SGF
ONT-MCI
ONT-JLN
ONT-COU
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
ONT-USMO
ONT-STL
ONT-SGF
ONT-MCI
ONT-JLN
What is the cheapest month to book a flight from Ontario to Missouri?
Currently, September is the cheapest month in which you can book a flight from Ontario to Missouri (average of $326). Flying from Ontario to Missouri in July is currently the most expensive (average of $528). 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 Ontario to Missouri?
Airfare is below average for this route at the moment.
Ontario to Missouri flights typically cost between $269 and $560 in September.The cheapest round-trip price found within the last 5 days was $156 on Frontier (Sep 16-Sep 23).
How far ahead should I book a flight from Ontario to Missouri?
Booking 77 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Missouri. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
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 August 25, 2026.
See what other customers who have flown with Southwest,Delta, andUnited Airlines from Ontario to Missouri have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Entertainment
7.5
Overall
8.0
Comfort
8.0
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Overall
8.0
Comfort
8.0
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Overall
8.0
Comfort
8.0
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Overall
8.0
Comfort
8.0
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Overall
8.0
Comfort
8.0
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Entertainment
7.5
Overall
8.0
Comfort
8.0
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Related info for your journey
Find useful and relevant information for your journey from Ontario to Missouri. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Ontario to Missouri
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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 August 25, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to Missouri flights
Consider these flights traveling from Ontario to Missouri.
Top 5 airlines flying from Ontario to Missouri
Discover the top 5 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 7,457,451 searches. Data last updated August 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$98 | Average$432 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$105 | Average$277 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$236 | Average$529 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$259 | Average$481 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$266 | Average$473 | FlexibilityNo cancel fee | On-time63% |