$81+ 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 8/29. Fares are subject to change and may not be available on all flights or dates of travel.
MCI — ONT
Jul 8 — Jul 151
Round-trip
1 adult, Economy
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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 June 8, 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 June 8, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 9/92:17 pm
MCI
- ONT
1 stop11h 38m
Frontier
Tue 9/222:55 pm
ONT
- MCI
1 stop20h 27m
Frontier
Deal found 6/6![Frontier logo]()
$220
This Expedia deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 7/81:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Sat 7/186:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/7![Frontier logo]()
$244
This Kiwi.com deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 8/144:57 pm
STL
- ONT
2 stops32h 53m
Frontier
Wed 8/1910:50 am
ONT
- STL
1 stop6h 33m
Frontier
Deal found 6/3![Frontier logo]()
$246
This Kiwi.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/78:08 pm
STL
- ONT
1 stop15h 56m
Frontier
Tue 7/283:40 pm
ONT
- STL
1 stop24h 25m
Frontier
Deal found 6/4![Frontier logo]()
$247
This Kiwi.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 9/78:08 pm
STL
- ONT
1 stop29h 41m
Frontier
Mon 9/149:49 pm
ONT
- STL
1 stop12h 02m
Frontier
Deal found 6/4![Frontier logo]()
$253
This Frontier deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 10/72:17 pm
MCI
- ONT
1 stop11h 38m
Frontier
Sat 10/106:00 am
ONT
- MCI
1 stop5h 22m
Frontier
Deal found 6/5![Frontier logo]()
$253
This Booking.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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.
Wed 7/11:45 pm
MCI
- ONT
1 stop22h 20m
Frontier
Sat 7/411:58 am
ONT
- MCI
1 stop25h 49m
Frontier
Deal found 6/4![Frontier logo]()
$255
This Booking.com deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 8/151:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Sat 8/226:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/6![Frontier logo]()
$256
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 7/141:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Tue 7/216:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/7![Frontier logo]()
$257
This Trip.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 8/51:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Sun 8/94:34 pm
ONT
- MCI
1 stop21h 13m
Frontier
Deal found 6/4![Frontier logo]()
$260
This Frontier deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 8/51:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Tue 8/116:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/4![Frontier logo]()
$261
This Booking.com deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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.
Wed 7/151:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Wed 7/223:40 pm
ONT
- MCI
1 stop22h 07m
Frontier
Deal found 6/3![Frontier logo]()
$262
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 June 8, 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 June 8, 2026.
This CheapOair deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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.
Wed 9/26:58 pm
STL
- ONT
1 stop22h 11m
Frontier
Tue 9/83:34 pm
ONT
- STL
1 stop18h 17m
Frontier
Deal found 6/7![Frontier logo]()
$297
This United Airlines deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 7/33:25 pm
COU
- ONT
1 stop9h 26m
United Airlines
Sat 7/46:10 am
ONT
- COU
1 stop6h 40m
United Airlines
Deal found 6/5![United Airlines logo]()
$328
This Delta deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 11/303:30 pm
SGF
- ONT
1 stop8h 44m
Delta
Sat 4/37:00 am
ONT
- SGF
1 stop9h 16m
Delta
Deal found 6/7![Delta logo]()
$389
This Southwest deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/41:35 pm
MCI
- ONT
2 stops7h 30m
Southwest
Sat 7/1110:30 am
ONT
- MCI
1 stop5h 20m
Southwest
Deal found 6/4![Southwest logo]()
$434
This Alaska Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 8/76:02 am
MCI
- ONT
1 stop9h 07m
Alaska Airlines
Tue 8/112:05 pm
ONT
- MCI
1 stop7h 54m
Alaska Airlines
Deal found 6/4![Alaska Airlines logo]()
$455
This American Airlines deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/165:32 am
STL
- ONT
1 stop5h 57m
American Airlines
Tue 7/211:11 pm
ONT
- STL
2 stops8h 47m
American Airlines
Deal found 6/3![American Airlines logo]()
$469
This CheapOair deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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.
Fri 7/247:10 pm
STL
- ONT
1 stop14h 53m
Frontier
Sun 7/2611:52 am
ONT
- STL
1 stop28h 23m
Frontier
Deal found 6/7![Frontier logo]()
$328
This Frontier deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/81:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Sat 7/186:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/4![Frontier logo]()
$340
This Delta deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 6/307:02 am
MCI
- ONT
1 stop7h 08m
Delta
Tue 7/75:10 pm
ONT
- MCI
1 stop5h 03m
Delta
Deal found 6/3![Delta logo]()
$391
This United Airlines deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 7/93:25 pm
COU
- ONT
1 stop9h 26m
United Airlines
Sat 7/111:18 pm
ONT
- COU
1 stop5h 21m
United Airlines
Deal found 6/6![United Airlines logo]()
$418
This Frontier deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 6/291:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Thu 7/26:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/3![Frontier logo]()
$348
This Delta deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 8/1511:38 am
SGF
- ONT
1 stop8h 51m
Delta
Fri 8/2112:00 pm
ONT
- SGF
1 stop8h 21m
Delta
Deal found 6/4![Delta logo]()
$407
This Southwest deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 9/46:20 am
MCI
- ONT
1 stop5h 00m
Southwest
Tue 9/88:35 am
ONT
- MCI
2 stops6h 50m
Southwest
Deal found 6/7![Southwest logo]()
$452
This CheapOair deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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.
Wed 11/253:34 pm
MCI
- ONT
1 stop9h 05m
Alaska Airlines
Fri 11/276:00 am
ONT
- MCI
1 stop15h 36m
Alaska Airlines
Deal found 6/7![Alaska Airlines logo]()
$467
This United Airlines deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 10/273:10 pm
SGF
- ONT
1 stop8h 11m
United Airlines
Sat 10/316:02 am
ONT
- SGF
1 stop8h 01m
United Airlines
Deal found 6/7![United Airlines logo]()
$429
This CheapOair deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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.
Sun 6/282:56 pm
STL
- ONT
1 stop26h 12m
Frontier
Sun 7/53:40 pm
ONT
- STL
1 stop24h 35m
Frontier
Deal found 6/6![Frontier logo]()
$360
This American Airlines deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 6/275:29 am
STL
- ONT
2 stops8h 35m
American Airlines
Sun 7/51:11 pm
ONT
- STL
2 stops8h 47m
American Airlines
Deal found 6/3![American Airlines logo]()
$517
This Delta deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 7/36:00 pm
MCI
- ONT
1 stop7h 49m
Delta
Tue 7/75:10 pm
ONT
- MCI
1 stop5h 03m
Delta
Deal found 6/3![Delta logo]()
$429
This United Airlines deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 10/33:05 pm
SGF
- ONT
1 stop8h 54m
United Airlines
Tue 10/66:00 am
ONT
- SGF
1 stop6h 16m
United Airlines
Deal found 6/7![United Airlines logo]()
$429
This CheapOair deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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.
Fri 10/94:40 pm
STL
- ONT
1 stop9h 02m
Alaska Airlines
Tue 10/136:00 am
ONT
- STL
1 stop7h 44m
Alaska Airlines
Deal found 6/7![Alaska Airlines logo]()
$477
This Southwest deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 7/158:35 am
STL
- ONT
2 stops8h 20m
Southwest
Thu 7/168:35 am
ONT
- STL
2 stops8h 25m
Southwest
Deal found 6/6![Southwest logo]()
$487
This American Airlines deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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.
Sun 6/289:42 am
STL
- ONT
2 stops10h 39m
American Airlines
Sun 7/51:11 pm
ONT
- STL
2 stops8h 47m
American Airlines
Deal found 6/3![American Airlines logo]()
$517
This United Airlines deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 7/43:05 pm
SGF
- ONT
1 stop8h 52m
United Airlines
Sat 7/111:18 pm
ONT
- SGF
1 stop5h 25m
United Airlines
Deal found 6/6![United Airlines logo]()
$435
This Delta deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 6/307:55 pm
STL
- ONT
1 stop5h 54m
Delta
Fri 7/35:21 pm
ONT
- STL
1 stop5h 22m
Delta
Deal found 6/7![Delta logo]()
$451
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 6/222:15 pm
STL
- ONT
2 stops7h 55m
Southwest
Sat 7/410:30 am
ONT
- STL
2 stops7h 40m
Southwest
Deal found 6/8![Southwest logo]()
$534
This United Airlines deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 7/43:05 pm
SGF
- ONT
1 stop8h 52m
United Airlines
Wed 7/85:45 am
ONT
- SGF
1 stop8h 35m
United Airlines
Deal found 6/5![United Airlines logo]()
$474
This Delta deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 11/257:40 pm
MCI
- ONT
1 stop6h 08m
Delta
Sat 11/285:05 pm
ONT
- MCI
1 stop5h 16m
Delta
Deal found 6/7![Delta logo]()
$479
This Southwest deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 7/63:35 pm
STL
- ONT
2 stops8h 40m
Southwest
Mon 7/136:30 am
ONT
- STL
2 stops8h 00m
Southwest
Deal found 6/6![Southwest logo]()
$558
This American Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/711:45 am
COU
- ONT
2 stops8h 33m
American Airlines
Sun 7/127:15 pm
ONT
- COU
2 stops12h 47m
American Airlines
Deal found 6/4![American Airlines logo]()
$619
This United Airlines deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/155:13 pm
MCI
- ONT
1 stop5h 40m
United Airlines
Sat 8/2211:00 am
ONT
- MCI
2 stops10h 30m
United Airlines
Deal found 6/6![United Airlines logo]()
$478
Last-minute flights from Missouri to OntarioDiscover last-minute flight deals from Missouri to Ontario. Data last updated June 8, 2026 and is based on user searches.
Discover last-minute flight deals from Missouri to Ontario. Data last updated June 8, 2026 and is based on user searches.
This Booking.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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.
Wed 7/11:45 pm
MCI
- ONT
1 stop22h 20m
Frontier
Sat 7/411:58 am
ONT
- MCI
1 stop25h 49m
Frontier
Deal found 6/4![Frontier logo]()
$255
This Booking.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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.
Wed 7/11:45 pm
MCI
- ONT
1 stop22h 20m
Frontier
Tue 7/76:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/7![Frontier logo]()
$272
This Mytrip deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 7/21:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Wed 7/81:38 pm
ONT
- MCI
1 stop24h 09m
Frontier
Deal found 6/5![Frontier logo]()
$277
This Kiwi.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/78:08 pm
STL
- ONT
1 stop15h 56m
Frontier
Tue 7/283:40 pm
ONT
- STL
1 stop24h 25m
Frontier
Deal found 6/4![Frontier logo]()
$247
This Expedia deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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.
Tue 7/77:03 pm
STL
- ONT
1 stop15h 00m
Frontier
Tue 7/143:40 pm
ONT
- STL
1 stop24h 25m
Frontier
Deal found 6/7![Frontier logo]()
$264
This Expedia deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 7/81:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Sat 7/186:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/7![Frontier logo]()
$244
This Travelocity deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/131:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Tue 7/216:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/6![Frontier logo]()
$276
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 7/141:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Tue 7/216:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/7![Frontier logo]()
$257
This Booking.com deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 7/147:03 pm
STL
- ONT
1 stop15h 00m
Frontier
Sat 7/186:00 am
ONT
- STL
1 stop11h 23m
Frontier
Deal found 6/5![Frontier logo]()
$266
This Booking.com deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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.
Wed 7/151:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Wed 7/223:40 pm
ONT
- MCI
1 stop22h 07m
Frontier
Deal found 6/3![Frontier logo]()
$262
This Frontier deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/181:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Tue 7/216:00 am
ONT
- MCI
1 stop5h 00m
Frontier
Deal found 6/4![Frontier logo]()
$275
This Expedia deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 7/221:45 pm
MCI
- ONT
1 stop22h 19m
Frontier
Tue 7/2810:49 am
ONT
- MCI
1 stop24h 11m
Frontier
Deal found 6/3![Frontier logo]()
$270
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 June 8, 2026.
Search for one-way flight options from Missouri to Ontario. Find affordable one-way fares based on user searches. Data last updated June 8, 2026.
This Trip.com deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 8/291:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 6/3![Frontier logo]()
$81
This Trip.com deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 8/51:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 6/3![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/106:07 pm
MCI
- ONT
2 stops41h 57m
Frontier
Deal found 6/3![Frontier logo]()
$99
This Trip.com deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 9/92:17 pm
MCI
- ONT
1 stop11h 38m
Frontier
Deal found 6/3![Frontier logo]()
$101
This Trip.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 9/222:17 pm
MCI
- ONT
1 stop11h 38m
Frontier
Deal found 6/4![Frontier logo]()
$105
This Trip.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 8/41:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 6/4![Frontier logo]()
$108
This Trip.com deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 8/251:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 6/5![Frontier logo]()
$109
This Trip.com deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 7/141:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 6/3![Frontier logo]()
$115
This Trip.com deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 9/302:17 pm
MCI
- ONT
1 stop11h 38m
Frontier
Deal found 6/5![Frontier logo]()
$116
This Trip.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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.
Mon 8/31:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 6/7![Frontier logo]()
$119
This Trip.com deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 8/61:45 pm
MCI
- ONT
1 stop12h 05m
Frontier
Deal found 6/6![Frontier logo]()
$120
This Trip.com deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 8/221:45 pm
MCI
- ONT
1 stop12h 04m
Frontier
Deal found 6/3![Frontier logo]()
$123
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 June 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $220 (Kiwi.com) |
One-way from | $81 (Trip.com) |
Popular in | May |
Cheapest in | September |
Average price | $425 |
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 June 8, 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 - ONT
STLONT
Lambert-St Louis
Wed 9/2
6:58 pm-3:09 pm
1 stop22h 11m
Ontario
Tue 9/8
3:34 pm-11:51 am
1 stop18h 17m
$297
ColumbiaOntario
COU - ONT
COUONT
Columbia Regional
Fri 7/3
3:25 pm-10:51 pm
1 stop9h 26m
Ontario
Sat 7/4
6:10 am-2:50 pm
1 stop6h 40m
$328
St. LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Fri 7/24
7:10 pm-8:03 am
1 stop14h 53m
Ontario
Sun 7/26
11:52 am-6:15 pm
1 stop28h 23m
$328
Kansas CityOntario
MCI - ONT
MCIONT
Kansas City
Wed 7/8
1:45 pm-11:50 pm
1 stop12h 05m
Ontario
Sat 7/18
6:00 am-1:00 pm
1 stop5h 00m
$340
Kansas CityOntario
MCI - ONT
MCIONT
Kansas City
Mon 6/29
1:45 pm-11:49 pm
1 stop12h 04m
Ontario
Thu 7/2
6:00 am-1:00 pm
1 stop5h 00m
$348
St. LouisOntario
STL - ONT
STLONT
Lambert-St Louis
Sun 6/28
2:56 pm-3:08 pm
1 stop26h 12m
Ontario
Sun 7/5
3:40 pm-6:15 pm
1 stop24h 35m
$360
SpringfieldOntario
SGF - ONT
SGFONT
Springfield-Branson
Mon 11/30
3:30 pm-10:14 pm
1 stop8h 44m
Ontario
Sat 4/3
7:00 am-6:16 pm
1 stop9h 16m
$389
Kansas CityOntario
MCI - ONT
MCIONT
Kansas City
Tue 6/30
7:02 am-12:10 pm
1 stop7h 08m
Ontario
Tue 7/7
5:10 pm-12:13 am
1 stop5h 03m
$391
SpringfieldOntario
SGF - ONT
SGFONT
Springfield-Branson
Sat 8/15
11:38 am-6:29 pm
1 stop8h 51m
Ontario
Fri 8/21
12:00 pm-10:21 pm
1 stop8h 21m
$407
ColumbiaOntario
COU - ONT
COUONT
Columbia Regional
Thu 7/9
3:25 pm-10:51 pm
1 stop9h 26m
Ontario
Sat 7/11
1:18 pm-8:39 pm
1 stop5h 21m
$418
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
COU-ONT
SGF-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
STL-ONT
MCI-ONT
COU-ONT
SGF-ONT
What is the cheapest month to book a flight from Missouri to Ontario?
Currently, August is the cheapest month in which you can book a flight from Missouri to Ontario (average of $61). Flying from Missouri to Ontario in February is currently the most expensive (average of $284). 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?
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.
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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 June 8, 2026.
Missouri and Ontario flights
Browse other Missouri and Ontario flight options. Last updated on June 8, 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 June 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$94 | Average$267 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$201 | Average$433 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$247 | Average$424 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$269 | Average$426 | FlexibilityNo cancel fee | On-time63% |