$143+ Cheap flights from Ontario (ONT) to Maine
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 6/29. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PWM
May 19 — May 261
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Maine with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from Ontario to MaineExplore the most affordable flight options available from Ontario to Maine. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 19, 2026.
Explore the most affordable flight options available from Ontario to Maine. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 19, 2026.
This United Airlines deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 10/266:53 pm
ONT
- BOS
1 stop10h 30m
United Airlines
Sat 10/313:19 pm
BOS
- ONT
1 stop8h 01m
United Airlines
Deal found 4/18![United Airlines logo]()
$292
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Fri 5/11:30 pm
ONT
- BOS
1 stop8h 40m
United Airlines
Wed 5/63:43 pm
BOS
- ONT
1 stop9h 15m
United Airlines
Deal found 4/16![United Airlines logo]()
$297
This American Airlines deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/47:35 pm
ONT
- BOS
1 stop7h 25m
American Airlines
Tue 5/126:13 am
BOS
- ONT
1 stop8h 21m
American Airlines
Deal found 4/14![American Airlines logo]()
$298
This American Airlines deal was found by Cheapflights users on 4/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/612:19 pm
ONT
- BOS
1 stop9h 05m
American Airlines
Fri 5/85:54 pm
BOS
- ONT
1 stop8h 52m
American Airlines
Deal found 4/15![American Airlines logo]()
$299
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Fri 5/11:40 pm
ONT
- BOS
1 stop7h 19m
United Airlines
Tue 5/59:20 am
BOS
- ONT
2 stops11h 32m
United Airlines
Deal found 4/16![United Airlines logo]()
$302
This American Airlines deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 5/511:59 pm
ONT
- BOS
2 stops9h 23m
American Airlines
Tue 5/1211:11 am
BOS
- ONT
2 stops10h 13m
American Airlines
Deal found 4/18![American Airlines logo]()
$307
This CheapOair deal was found by Cheapflights users on 4/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/83:26 pm
ONT
- BOS
1 stop12h 46m
Alaska Airlines
Tue 5/126:42 pm
BOS
- ONT
1 stop19h 30m
Alaska Airlines
Deal found 4/16![Alaska Airlines logo]()
$309
This CheapOair deal was found by Cheapflights users on 4/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/47:59 pm
ONT
- BOS
1 stop16h 34m
Alaska Airlines
Thu 5/76:42 pm
BOS
- ONT
1 stop18h 03m
Alaska Airlines
Deal found 4/15![Alaska Airlines logo]()
$313
This Alaska Airlines deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2910:39 am
ONT
- BOS
1 stop10h 20m
Alaska Airlines
Sat 5/25:05 pm
BOS
- ONT
1 stop9h 43m
Alaska Airlines
Deal found 4/15![Alaska Airlines logo]()
$317
This Delta deal was found by Cheapflights users on 4/15. 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 8/175:05 pm
ONT
- BOS
1 stop10h 04m
Delta
Sat 8/226:25 pm
BOS
- ONT
1 stop8h 19m
Delta
Deal found 4/15![Delta logo]()
$318
This United Airlines deal was found by Cheapflights users on 4/14. 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.
Mon 6/16:30 pm
ONT
- BOS
1 stop8h 28m
United Airlines
Sat 6/66:00 am
BOS
- ONT
1 stop9h 12m
United Airlines
Deal found 4/14![United Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/17:35 pm
ONT
- BOS
2 stops10h 52m
American Airlines
Tue 5/512:41 pm
BOS
- ONT
1 stop8h 43m
American Airlines
Deal found 4/14![American Airlines logo]()
$322
Best flights from Ontario to MaineDiscover carefully curated flight deals from Ontario to Maine that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 19, 2026.
Discover carefully curated flight deals from Ontario to Maine that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 19, 2026.
This Delta deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 5/1810:00 pm
ONT
- BOS
1 stop8h 46m
Delta
Sat 5/306:10 am
BOS
- ONT
1 stop9h 09m
Delta
Deal found 4/18![Delta logo]()
$297
This Southwest deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/127:40 am
ONT
- BOS
2 stops10h 45m
Southwest
Wed 8/199:25 am
BOS
- ONT
2 stops9h 40m
Southwest
Deal found 4/17![Southwest logo]()
$377
This Alaska Airlines deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1510:33 am
ONT
- BOS
1 stop10h 26m
Alaska Airlines
Mon 5/257:15 am
BOS
- ONT
1 stop19h 44m
Alaska Airlines
Deal found 4/15![Alaska Airlines logo]()
$395
This JetBlue deal was found by Cheapflights users on 4/14. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/1611:53 pm
ONT
- PWM
1 stop10h 42m
JetBlue
Thu 6/252:30 pm
PWM
- ONT
1 stop11h 08m
JetBlue
Deal found 4/14![JetBlue logo]()
$436
This United Airlines deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/36:59 pm
ONT
- BOS
1 stop10h 24m
United Airlines
Tue 5/121:30 pm
BOS
- ONT
1 stop11h 28m
United Airlines
Deal found 4/13![United Airlines logo]()
$437
This American Airlines deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/308:02 pm
ONT
- BGR
2 stops12h 29m
American Airlines
Tue 10/612:29 pm
BGR
- ONT
2 stops13h 37m
American Airlines
Deal found 4/17![American Airlines logo]()
$453
This Delta deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 5/1810:00 pm
ONT
- BOS
1 stop8h 46m
Delta
Fri 5/295:35 am
BOS
- ONT
1 stop8h 22m
Delta
Deal found 4/18![Delta logo]()
$318
This Delta deal was found by Cheapflights users on 4/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/410:15 pm
ONT
- BOS
1 stop10h 20m
Delta
Tue 5/123:00 pm
BOS
- ONT
1 stop9h 48m
Delta
Deal found 4/14![Delta logo]()
$344
This Delta deal was found by Cheapflights users on 4/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/35:05 pm
ONT
- BOS
1 stop9h 55m
Delta
Fri 5/226:45 pm
BOS
- ONT
1 stop7h 49m
Delta
Deal found 4/14![Delta logo]()
$348
This Southwest deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/311:55 pm
ONT
- BOS
2 stops9h 15m
Southwest
Tue 6/93:45 pm
BOS
- ONT
2 stops10h 00m
Southwest
Deal found 4/17![Southwest logo]()
$432
This Alaska Airlines deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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.
Sat 5/166:00 am
ONT
- BOS
1 stop9h 11m
Alaska Airlines
Mon 6/16:00 am
BOS
- ONT
1 stop20h 56m
Alaska Airlines
Deal found 4/18![Alaska Airlines logo]()
$446
This United Airlines deal was found by Cheapflights users on 4/15. 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.
Tue 6/26:30 pm
ONT
- PWM
2 stops11h 41m
United Airlines
Wed 6/34:51 pm
PWM
- ONT
1 stop8h 55m
United Airlines
Deal found 4/15![United Airlines logo]()
$474
This Southwest deal was found by Cheapflights users on 4/13. 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.
Mon 5/45:15 am
ONT
- BOS
2 stops8h 55m
Southwest
Sun 5/105:15 am
BOS
- ONT
1 stop7h 35m
Southwest
Deal found 4/13![Southwest logo]()
$437
This Delta deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1312:00 pm
ONT
- BOS
1 stop8h 48m
Delta
Fri 10/166:25 pm
BOS
- ONT
1 stop8h 23m
Delta
Deal found 4/18![Delta logo]()
$379
This Southwest deal was found by Cheapflights users on 4/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/119:50 am
ONT
- PWM
2 stops10h 50m
Southwest
Wed 7/155:30 am
PWM
- ONT
1 stop9h 35m
Southwest
Deal found 4/14![Southwest logo]()
$454
This American Airlines deal was found by Cheapflights users on 4/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2111:59 pm
ONT
- BGR
2 stops12h 44m
American Airlines
Sun 8/2312:41 pm
BGR
- ONT
2 stops13h 17m
American Airlines
Deal found 4/15![American Airlines logo]()
$570
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Tue 5/125:00 am
ONT
- PWM
1 stop7h 41m
United Airlines
Wed 5/274:51 pm
PWM
- ONT
1 stop8h 55m
United Airlines
Deal found 4/16![United Airlines logo]()
$523
This Delta deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1210:00 pm
ONT
- PWM
2 stops11h 38m
Delta
Wed 5/2712:50 pm
PWM
- ONT
2 stops13h 44m
Delta
Deal found 4/17![Delta logo]()
$399
This United Airlines deal was found by Cheapflights users on 4/14. 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 4/306:59 pm
ONT
- PWM
2 stops12h 19m
United Airlines
Sun 5/34:50 pm
PWM
- ONT
1 stop8h 45m
United Airlines
Deal found 4/14![United Airlines logo]()
$534
This Delta deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 6/65:55 pm
ONT
- BOS
1 stop9h 25m
Delta
Sat 6/136:05 am
BOS
- ONT
1 stop9h 05m
Delta
Deal found 4/18![Delta logo]()
$438
This United Airlines deal was found by Cheapflights users on 4/14. 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 4/306:59 pm
ONT
- PWM
2 stops12h 19m
United Airlines
Mon 5/43:23 pm
PWM
- ONT
1 stop8h 13m
United Airlines
Deal found 4/14![United Airlines logo]()
$534
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Fri 5/17:03 pm
ONT
- PWM
2 stops12h 20m
United Airlines
Tue 5/53:23 pm
PWM
- ONT
1 stop8h 13m
United Airlines
Deal found 4/16![United Airlines logo]()
$534
This United Airlines deal was found by Cheapflights users on 4/14. 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.
Mon 5/115:00 am
ONT
- PWM
1 stop7h 41m
United Airlines
Wed 5/274:51 pm
PWM
- ONT
1 stop8h 55m
United Airlines
Deal found 4/14![United Airlines logo]()
$568
This Alaska Airlines deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/56:00 am
ONT
- BGR
2 stops12h 45m
Alaska Airlines
Sat 5/912:46 pm
BGR
- ONT
2 stops14h 02m
Alaska Airlines
Deal found 4/15![Alaska Airlines logo]()
$882
This Alaska Airlines deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/16:00 am
ONT
- BGR
2 stops12h 45m
Alaska Airlines
Sat 5/912:46 pm
BGR
- ONT
2 stops14h 02m
Alaska Airlines
Deal found 4/15![Alaska Airlines logo]()
$916
This United Airlines deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:30 pm
ONT
- BGR
2 stops13h 34m
United Airlines
Wed 7/154:35 pm
BGR
- ONT
1 stop9h 16m
United Airlines
Deal found 4/18![United Airlines logo]()
$716
This Alaska Airlines deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/215:26 pm
ONT
- BGR
2 stops14h 25m
Alaska Airlines
Tue 7/2811:16 am
BGR
- ONT
2 stops14h 55m
Alaska Airlines
Deal found 4/15![Alaska Airlines logo]()
$1,055
This United Airlines deal was found by Cheapflights users on 4/15. 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 8/245:00 am
ONT
- BGR
2 stops15h 12m
United Airlines
Mon 8/319:15 am
BGR
- ONT
1 stop12h 04m
United Airlines
Deal found 4/15![United Airlines logo]()
$740
This United Airlines deal was found by Cheapflights users on 4/14. 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.
Mon 6/86:30 pm
ONT
- BGR
2 stops13h 34m
United Airlines
Mon 6/156:10 am
BGR
- ONT
2 stops14h 46m
United Airlines
Deal found 4/14![United Airlines logo]()
$793
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Fri 5/15:00 am
ONT
- BGR
2 stops11h 40m
United Airlines
Tue 5/57:40 am
BGR
- ONT
2 stops13h 12m
United Airlines
Deal found 4/16![United Airlines logo]()
$810
Last-minute flights from Ontario to MaineDiscover last-minute flight deals from Ontario to Maine. Data last updated April 19, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Maine. Data last updated April 19, 2026 and is based on user searches.
This Alaska Airlines deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2910:39 am
ONT
- BOS
1 stop10h 20m
Alaska Airlines
Sat 5/25:05 pm
BOS
- ONT
1 stop9h 43m
Alaska Airlines
Deal found 4/15![Alaska Airlines logo]()
$317
This United Airlines deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/301:40 pm
ONT
- BOS
1 stop7h 19m
United Airlines
Tue 5/511:27 am
BOS
- ONT
2 stops12h 09m
United Airlines
Deal found 4/16![United Airlines logo]()
$326
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Fri 5/11:30 pm
ONT
- BOS
1 stop8h 40m
United Airlines
Wed 5/63:43 pm
BOS
- ONT
1 stop9h 15m
United Airlines
Deal found 4/16![United Airlines logo]()
$297
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Fri 5/11:40 pm
ONT
- BOS
1 stop7h 19m
United Airlines
Tue 5/59:20 am
BOS
- ONT
2 stops11h 32m
United Airlines
Deal found 4/16![United Airlines logo]()
$302
This American Airlines deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/17:35 pm
ONT
- BOS
2 stops10h 52m
American Airlines
Tue 5/512:41 pm
BOS
- ONT
1 stop8h 43m
American Airlines
Deal found 4/14![American Airlines logo]()
$322
This American Airlines deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/47:35 pm
ONT
- BOS
1 stop7h 25m
American Airlines
Tue 5/126:13 am
BOS
- ONT
1 stop8h 21m
American Airlines
Deal found 4/14![American Airlines logo]()
$298
This CheapOair deal was found by Cheapflights users on 4/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/47:59 pm
ONT
- BOS
1 stop16h 34m
Alaska Airlines
Thu 5/76:42 pm
BOS
- ONT
1 stop18h 03m
Alaska Airlines
Deal found 4/15![Alaska Airlines logo]()
$313
This American Airlines deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 5/511:59 pm
ONT
- BOS
2 stops9h 23m
American Airlines
Tue 5/1211:11 am
BOS
- ONT
2 stops10h 13m
American Airlines
Deal found 4/18![American Airlines logo]()
$307
This American Airlines deal was found by Cheapflights users on 4/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/612:19 pm
ONT
- BOS
1 stop9h 05m
American Airlines
Fri 5/85:54 pm
BOS
- ONT
1 stop8h 52m
American Airlines
Deal found 4/15![American Airlines logo]()
$299
This CheapOair deal was found by Cheapflights users on 4/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/83:26 pm
ONT
- BOS
1 stop12h 46m
Alaska Airlines
Tue 5/126:42 pm
BOS
- ONT
1 stop19h 30m
Alaska Airlines
Deal found 4/16![Alaska Airlines logo]()
$309
This American Airlines deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 5/124:52 pm
ONT
- PWM
2 stops14h 15m
American Airlines
Wed 5/275:36 pm
PWM
- ONT
1 stop9h 23m
American Airlines
Deal found 4/18![American Airlines logo]()
$363
This Delta deal was found by Cheapflights users on 4/15. 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.
Sat 5/305:55 pm
ONT
- BOS
1 stop9h 25m
Delta
Sat 6/65:35 am
BOS
- ONT
1 stop8h 22m
Delta
Deal found 4/15![Delta logo]()
$318
One-way flights from Ontario to MaineSearch for one-way flight options from Ontario to Maine. Find affordable one-way fares based on user searches. Data last updated April 19, 2026.
Search for one-way flight options from Ontario to Maine. Find affordable one-way fares based on user searches. Data last updated April 19, 2026.
This Trip.com deal was found by Cheapflights users on 4/15. 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.
Mon 6/295:24 pm
ONT
- BOS
1 stop9h 41m
Delta
Deal found 4/15![Delta logo]()
$143
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Mon 5/46:59 pm
ONT
- BOS
1 stop10h 24m
United Airlines
Deal found 4/16![United Airlines logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 4/16. 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.
Wed 5/68:06 pm
ONT
- BOS
2 stops24h 48m
Multiple Airlines
Deal found 4/16![Multiple Airlines logo]()
$146
This Delta deal was found by Cheapflights users on 4/15. 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.
Sat 5/165:55 pm
ONT
- BOS
1 stop9h 25m
Delta
Deal found 4/15![Delta logo]()
$149
This American Airlines deal was found by Cheapflights users on 4/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/27:12 pm
ONT
- BOS
1 stop6h 53m
American Airlines
Deal found 4/16![American Airlines logo]()
$150
This American Airlines deal was found by Cheapflights users on 4/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/47:35 pm
ONT
- BOS
2 stops9h 51m
American Airlines
Deal found 4/16![American Airlines logo]()
$154
This Alaska Airlines deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/910:39 am
ONT
- BOS
1 stop10h 20m
Alaska Airlines
Deal found 4/17![Alaska Airlines logo]()
$155
This Kiwi.com deal was found by Cheapflights users on 4/16. 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 5/58:06 pm
ONT
- BOS
3 stops24h 48m
Multiple Airlines
Deal found 4/16![Multiple Airlines logo]()
$156
This Alaska Airlines deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/510:39 am
ONT
- BOS
1 stop10h 20m
Alaska Airlines
Deal found 4/17![Alaska Airlines logo]()
$159
This CheapOair deal was found by Cheapflights users on 4/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/77:59 pm
ONT
- BOS
1 stop16h 34m
Alaska Airlines
Deal found 4/14![Alaska Airlines logo]()
$160
This CheapOair deal was found by Cheapflights users on 4/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/47:59 pm
ONT
- BOS
1 stop16h 34m
Alaska Airlines
Deal found 4/15![Alaska Airlines logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 4/16. 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 4/2812:59 am
ONT
- BOS
2 stops21h 32m
Frontier
Deal found 4/16![Frontier logo]()
$168
Find flight deals from Ontario to Maine
Keep the following information in mind while searching for Ontario to Maine flight deals. Data was last updated April 19, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $297 (United Airlines) |
One-way from | $143 (Trip.com) |
Popular in | December |
Cheapest in | September |
Average price | $473 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Maine 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 April 19, 2026.
Use the filters below to find and compare flights from Ontario to Maine that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Mon 5/18
10:00 pm-9:46 am
1 stop8h 46m
Boston Logan Intl
Sat 5/30
6:10 am-12:19 pm
1 stop9h 09m
$297
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Mon 5/18
10:00 pm-9:46 am
1 stop8h 46m
Boston Logan Intl
Fri 5/29
5:35 am-10:57 am
1 stop8h 22m
$318
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Mon 5/4
10:15 pm-11:35 am
1 stop10h 20m
Boston Logan Intl
Tue 5/12
3:00 pm-9:48 pm
1 stop9h 48m
$344
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Sun 5/3
5:05 pm-6:00 am
1 stop9h 55m
Boston Logan Intl
Fri 5/22
6:45 pm-11:34 pm
1 stop7h 49m
$348
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Wed 8/12
7:40 am-9:25 pm
2 stops10h 45m
Boston Logan Intl
Wed 8/19
9:25 am-4:05 pm
2 stops9h 40m
$377
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Tue 10/13
12:00 pm-11:48 pm
1 stop8h 48m
Boston Logan Intl
Fri 10/16
6:25 pm-11:48 pm
1 stop8h 23m
$379
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Fri 5/15
10:33 am-11:59 pm
1 stop10h 26m
Boston Logan Intl
Mon 5/25
7:15 am-11:59 pm
1 stop19h 44m
$395
OntarioPortland
ONT - PWM
ONTPWM
Ontario
Tue 5/12
10:00 pm-12:38 pm
2 stops11h 38m
Portland
Wed 5/27
12:50 pm-11:34 pm
2 stops13h 44m
$399
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Wed 6/3
11:55 pm-12:10 pm
2 stops9h 15m
Boston Logan Intl
Tue 6/9
3:45 pm-10:45 pm
2 stops10h 00m
$432
OntarioPortland
ONT - PWM
ONTPWM
Ontario
Tue 6/16
11:53 pm-1:35 pm
1 stop10h 42m
Portland
Thu 6/25
2:30 pm-10:38 pm
1 stop11h 08m
$436
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to Maine
Have a flexible travel schedule? Discover the best time to fly to Maine from Ontario with our price prediction graph.
ONT-BOS
ONT-PWM
ONT-BGR
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 Maine
ONT-USME
ONT-BOS
ONT-PWM
ONT-BGR
How much does it cost to fly round-trip from Ontario to Maine?
Reviews of airlines servicing Maine
Get insights into the airlines that provide service to Maine. 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 Maine. Reviews last updated April 19, 2026.
See what other customers who have flown with Southwest,Delta, andUnited Airlines from Ontario to Maine 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.
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Related info for your journey
Find useful and relevant information for your journey from Ontario to Maine. 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 Maine
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Maine by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Maine by cabin class
Find flights from Ontario to Maine, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Maine flights
Browse other Ontario and Maine flight options. Last updated on April 19, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to Maine flights
Consider these flights traveling from Ontario to Maine.
Top 4 airlines flying from Ontario to Maine
Discover the top 4 airlines that operate flights from Ontario to Maine. 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 April 19, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$148 | Average$296 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$256 | Average$491 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$380 | Average$447 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$383 | Average$614 | FlexibilityNo cancel fee | On-time63% |