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Ontario

$169+ Cheap flights from Maine 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 8/26. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — ONT
Aug 23 — Aug 301
Sun 8/23
Sun 8/30
1 adult, Economy
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Cheap flight deals from Maine to Ontario

Cheapest flights from Maine to Ontario
Explore the most affordable flight options available from Maine to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 24, 2026.

This United Airlines deal was found by Cheapflights users on 7/21. 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.
Wed 9/92:00 pm
BOS
-
ONT
1 stop9h 01m
United Airlines
Sun 9/137:13 pm
ONT
-
BOS
1 stop10h 01m
United Airlines
Deal found 7/21$332
This American Airlines deal was found by Cheapflights users on 7/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:45 am
BOS
-
ONT
1 stop7h 58m
American Airlines
Sat 9/512:59 pm
ONT
-
BOS
1 stop7h 25m
American Airlines
Deal found 7/22$336
This Delta deal was found by Cheapflights users on 7/22. 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.
Thu 8/275:30 am
BOS
-
ONT
1 stop8h 12m
Delta
Tue 9/11:06 pm
ONT
-
BOS
1 stop7h 51m
Delta
Deal found 7/22$337
This Delta deal was found by Cheapflights users on 7/22. 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.
Thu 8/275:30 am
BOS
-
ONT
1 stop8h 12m
Delta
Sat 9/57:05 am
ONT
-
BOS
1 stop9h 30m
Delta
Deal found 7/22$338
This Delta deal was found by Cheapflights users on 7/23. 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.
Sun 8/306:05 am
BOS
-
ONT
1 stop9h 11m
Delta
Sat 9/57:05 am
ONT
-
BOS
1 stop9h 30m
Delta
Deal found 7/23$342
This United Airlines deal was found by Cheapflights users on 7/20. 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.
Mon 8/176:00 am
BOS
-
ONT
1 stop9h 12m
United Airlines
Mon 8/246:00 am
ONT
-
BOS
1 stop8h 29m
United Airlines
Deal found 7/20$351
This Delta deal was found by Cheapflights users on 7/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/132:14 pm
PWM
-
ONT
1 stop10h 38m
Delta
Fri 8/1412:00 pm
ONT
-
PWM
1 stop8h 13m
Delta
Deal found 7/20$351
This Southwest deal was found by Cheapflights users on 7/21. 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.
Tue 8/185:25 am
BOS
-
ONT
2 stops10h 15m
Southwest
Tue 8/2511:55 pm
ONT
-
BOS
1 stop9h 20m
Southwest
Deal found 7/21$352
This Delta deal was found by Cheapflights users on 7/24. 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.
Fri 8/2112:20 pm
BOS
-
ONT
1 stop9h 10m
Delta
Sun 8/3010:00 pm
ONT
-
BOS
1 stop8h 39m
Delta
Deal found 7/24$357
This KAYAK deal was found by Cheapflights users on 7/22. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/205:15 am
BOS
-
ONT
3 stops19h 00m
Southwest
Thu 10/2212:40 pm
ONT
-
BOS
1 stop9h 30m
Southwest
Deal found 7/22$358
This Delta deal was found by Cheapflights users on 7/23. 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.
Wed 12/1612:50 pm
PWM
-
ONT
2 stops13h 58m
Delta
Wed 1/66:00 am
ONT
-
PWM
2 stops13h 23m
Delta
Deal found 7/23$361
This Delta deal was found by Cheapflights users on 7/24. 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.
Fri 11/131:35 pm
PWM
-
ONT
1 stop11h 39m
Delta
Mon 11/2310:59 pm
ONT
-
PWM
1 stop10h 19m
Delta
Deal found 7/24$371

Find flight deals from Maine to Ontario

Keep the following information in mind while searching for Maine to Ontario flight deals. Data was last updated July 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$332
(United Airlines)

One-way from

$169
(United Airlines)

Popular in

June

Cheapest in

September

Average price

$477
Provider with most accurate pricing for Portland-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Los Angeles flights.
Search Deals
From Maine to Ontario
Search Deals
One-way flight from Maine to Ontario
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($76 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Maine 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 July 24, 2026.
Use the filters below to find and compare flights from Maine to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sun 8/30

6:05 am-12:16 pm

1 stop9h 11m

Ontario

Sat 9/5

7:05 am-7:35 pm

1 stop9h 30m

$342

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Fri 8/21

9:33 am-8:24 pm

1 stop13h 51m

Ontario

Mon 8/31

10:47 am-6:09 am

1 stop16h 22m

$347

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/27

3:14 pm-9:52 pm

1 stop9h 38m

Ontario

Sat 9/5

7:05 am-7:35 pm

1 stop9h 30m

$347

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/13

5:30 am-10:42 am

1 stop8h 12m

Ontario

Mon 8/24

12:00 pm-11:41 pm

1 stop8h 41m

$347

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 9/19

6:05 am-12:14 pm

1 stop9h 09m

Ontario

Tue 9/29

1:04 pm-11:53 pm

1 stop7h 49m

$357

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 12/16

12:50 pm-10:14 pm

2 stops12h 24m

Ontario

Wed 1/6

7:00 am-11:06 pm

2 stops13h 06m

$361

PortlandOntario

PWM - ONT

PWMONT

Portland

Fri 11/13

1:35 pm-10:14 pm

1 stop11h 39m

Ontario

Mon 11/23

10:59 pm-12:18 pm

1 stop10h 19m

$371

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 8/18

8:30 am-6:55 pm

1 stop13h 25m

Ontario

Sat 8/22

11:55 pm-11:25 am

1 stop8h 30m

$378

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 8/13

5:30 am-10:42 am

1 stop8h 12m

Ontario

Fri 8/28

10:00 pm-9:39 am

1 stop8h 39m

$378

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 9/17

9:33 am-5:18 pm

1 stop10h 45m

Ontario

Mon 9/21

6:14 pm-6:09 am

1 stop8h 55m

$387

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/22

Showing 1-10 of 49 resultsSorted by cheapest first
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Best time to book a flight from Maine to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Maine with our price prediction graph.
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 Maine to Ontario

No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Maine to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from Maine?

    If you book a flight to Ontario from Maine, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

  • How long is the flight from Maine to Ontario?

    Departing from Maine to Ontario will take you 8h 16m. The distance from Maine to Ontario is about 2590 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Maine to Ontario one-way?

    $148 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on United Airlines and American Airlines, with prices starting from $188 and $232, respectively.

  • What are the most popular routes from Maine to Ontario?

    The most popular route from Maine to Ontario is Boston Logan Intl - Ontario. You may also consider Portland - Ontario or Bangor - Ontario.

  • Can I find deals for flights from Maine to Ontario that include hotel bookings?

    Yes. In addition to deals on Maine to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Maine to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Maine to Ontario.

  • Can I find deals for business class flights from Maine to Ontario?

    Yes. Cheapflights offers flight deals from Maine to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Alternative routes for Maine to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Maine to Ontario

Discover the top airline that operate flights from Maine 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 July 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$399Average$599FlexibilityNo cancel feeOn-time71%

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