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$99+ 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 1/17. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — ONT
Jan 30 — Feb 61
Fri 1/30
Fri 2/6
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 December 31, 2025.

This United Airlines deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” 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 12/301:06 pmBOS - ONT
1 stop11h 46mUnited Airlines
Tue 2/105:05 amONT - BOS
1 stop7h 32mUnited Airlines
Deal found 12/29$623
This Southwest deal was found by Cheapflights users on 12/28. Clicking the “Pick Dates” 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 12/315:00 pmBOS - ONT
1 stop8h 05mSouthwest
Fri 1/25:00 amONT - BOS
2 stops10h 15mSouthwest
Deal found 12/28$672
This Delta deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” 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 12/306:05 amBOS - ONT
2 stops20h 49mDelta
Mon 2/910:30 pmONT - BOS
1 stop8h 32mDelta
Deal found 12/29$676
This United Airlines deal was found by Cheapflights users on 12/29. Clicking the “Pick Dates” 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 12/314:15 pmBOS - ONT
1 stop9h 10mUnited Airlines
Tue 1/61:24 pmONT - BOS
1 stop7h 22mUnited Airlines
Deal found 12/29$767
This United Airlines deal was found by Cheapflights users on 12/30. Clicking the “Pick Dates” 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 12/311:03 pmBGR - ONT
2 stops11h 49mUnited Airlines
Fri 1/26:10 amONT - BGR
2 stops14h 24mUnited Airlines
Deal found 12/30$3,123

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 December 31, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$237
(United Airlines)

One-way from

$99
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$578
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. 7% potential increase in price ($34 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 31, 2025.
Use the filters below to find and compare flights from Maine to Ontario that are best for you.

Fly from

Maine

Fly to

Ontario

Route

Depart

Return

Price

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 1/20

3:15 pm-8:58 pm

1 stop8h 43m

Ontario

Sun 1/25

5:05 am-3:37 pm

1 stop7h 32m

$237

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 2/24

7:00 am-3:08 pm

1 stop11h 08m

Ontario

Tue 3/3

4:02 pm-6:54 am

1 stop11h 52m

$258

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 2/4

7:00 am-3:08 pm

1 stop11h 08m

Ontario

Tue 2/10

11:53 am-11:54 pm

1 stop9h 01m

$258

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 1/29

7:15 am-1:56 pm

1 stop9h 41m

Ontario

Tue 2/3

1:11 pm-11:56 pm

1 stop7h 45m

$285

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 1/24

7:15 am-1:56 pm

1 stop9h 41m

Ontario

Mon 2/2

10:30 pm-11:40 am

1 stop10h 10m

$285

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Sat 4/25

4:50 pm-10:43 pm

1 stop8h 53m

Ontario

Tue 4/28

10:15 pm-9:49 am

1 stop8h 34m

$297

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 3/5

4:36 pm-11:52 pm

1 stop10h 16m

Ontario

Tue 3/10

12:02 pm-11:59 pm

1 stop8h 57m

$308

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Wed 3/4

4:36 pm-11:52 pm

1 stop10h 16m

Ontario

Tue 3/10

4:02 pm-6:54 am

1 stop11h 52m

$308

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Thu 2/5

7:00 am-3:08 pm

1 stop11h 08m

Ontario

Wed 2/11

11:53 am-11:54 pm

1 stop9h 01m

$308

BostonOntario

BOS - ONT

BOSONT

Boston Logan Intl

Tue 4/14

12:42 pm-6:28 pm

1 stop8h 46m

Ontario

Tue 4/21

12:39 pm-1:15 am

1 stop9h 36m

$315

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/30

Showing 1-10 of 52 results
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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

What is the cheapest month to book a flight from Maine to Ontario?

Currently, September is the cheapest month in which you can book a flight from Maine to Ontario (average of $158). Flying from Maine to Ontario in July is currently the most expensive (average of $296). 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.

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 43m. The distance from Maine to Ontario is about 2559 mi. This flight may include one or multiple stops.

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

    $118 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Delta and American Airlines, with prices starting from $148 and $160, 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.

  • What is the cheapest month to book a flight from Maine to Ontario?

    Currently, September is the cheapest month in which you can book a flight from Maine to Ontario (average of $158). Flying from Maine to Ontario in July is currently the most expensive (average of $296). 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.

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 2 airlines flying from Maine to Ontario

Discover the top 2 airlines 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 December 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$259Average$423FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$279Average$526FlexibilityNo cancel feeOn-time71%

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