HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Maine

$153+ 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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PWM
Aug 25 — Sep 11
Tue 8/25
Tue 9/1
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Ontario to Maine

Cheapest flights from Ontario to Maine
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 July 26, 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.
Thu 8/207:13 pm
ONT
-
BOS
1 stop10h 01m
United Airlines
Tue 8/252:00 pm
BOS
-
ONT
1 stop9h 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.
Tue 8/1812:59 pm
ONT
-
BOS
1 stop7h 25m
American Airlines
Wed 8/266:30 am
BOS
-
ONT
1 stop8h 33m
American Airlines
Deal found 7/22$337
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/34:09 pm
ONT
-
BOS
1 stop10h 32m
Alaska Airlines
Wed 11/49:00 am
BOS
-
ONT
1 stop10h 58m
Alaska Airlines
Deal found 7/23$341
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.
Fri 8/1412:00 pm
ONT
-
BOS
1 stop10h 25m
Delta
Tue 8/187:45 am
BOS
-
ONT
1 stop12h 36m
Delta
Deal found 7/22$342
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.
Fri 8/1412:00 pm
ONT
-
BOS
1 stop10h 25m
Delta
Thu 8/205:30 am
BOS
-
ONT
1 stop8h 12m
Delta
Deal found 7/22$343
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/181:06 pm
ONT
-
BOS
1 stop7h 51m
Delta
Tue 8/256:05 am
BOS
-
ONT
1 stop9h 11m
Delta
Deal found 7/21$347
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1411:55 pm
ONT
-
BOS
1 stop11h 30m
Southwest
Wed 10/211:05 pm
BOS
-
ONT
2 stops10h 40m
Southwest
Deal found 7/22$348
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2411:59 pm
ONT
-
PWM
1 stop9h 31m
JetBlue
Mon 8/312:40 pm
PWM
-
ONT
1 stop10h 58m
JetBlue
Deal found 7/24$349
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/77:34 pm
ONT
-
BOS
1 stop7h 24m
American Airlines
Wed 10/146:10 am
BOS
-
ONT
1 stop10h 20m
American Airlines
Deal found 7/23$350
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/17:45 am
ONT
-
BOS
2 stops10h 35m
Southwest
Sat 9/55:40 am
BOS
-
ONT
1 stop7h 40m
Southwest
Deal found 7/24$352
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/139:01 am
ONT
-
BOS
1 stop9h 01m
United Airlines
Tue 8/185:01 pm
BOS
-
ONT
1 stop8h 34m
United Airlines
Deal found 7/23$353
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/147:13 pm
ONT
-
BOS
1 stop10h 01m
United Airlines
Tue 8/185:01 pm
BOS
-
ONT
1 stop8h 34m
United Airlines
Deal found 7/23$354

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 July 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$332
(United Airlines)

One-way from

$153
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$619
Provider with most accurate pricing for Los Angeles-Portland flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Portland flights.
Search Deals
From Ontario to Maine
Search Deals
One-way flight from Ontario to Maine
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($18 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($17 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 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 July 26, 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

Price

Cheapest round-trip

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Mon 9/14

8:40 pm-9:55 am

2 stops10h 15m

Boston Logan Intl

Sun 9/20

5:20 am-10:00 am

1 stop7h 40m

$352

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Wed 10/14

8:25 am-9:15 pm

2 stops9h 50m

Boston Logan Intl

Wed 10/21

1:05 pm-8:45 pm

2 stops10h 40m

$393

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Fri 9/25

7:12 am-6:09 am

1 stop19h 57m

Boston Logan Intl

Mon 9/28

7:59 pm-4:10 pm

2 stops23h 11m

$413

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Fri 8/28

11:59 pm-1:45 pm

1 stop10h 46m

Portland

Tue 9/1

1:20 pm-10:37 pm

1 stop12h 17m

$419

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Wed 9/2

11:59 pm-3:10 pm

1 stop12h 11m

Boston Logan Intl

Wed 9/9

11:20 am-8:13 pm

1 stop11h 53m

$426

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Thu 9/17

9:01 am-9:02 pm

1 stop9h 01m

Boston Logan Intl

Mon 9/28

6:00 am-12:18 pm

1 stop9h 18m

$427

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Sat 9/12

7:00 am-7:19 pm

1 stop9h 19m

Boston Logan Intl

Sun 9/13

6:00 am-12:12 pm

1 stop9h 12m

$457

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Thu 8/27

9:01 am-11:59 pm

2 stops11h 58m

Boston Logan Intl

Sun 8/30

6:00 am-12:12 pm

1 stop9h 12m

$457

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Sat 8/29

5:00 am-7:19 pm

2 stops11h 19m

Boston Logan Intl

Mon 8/31

2:28 pm-10:59 pm

2 stops11h 31m

$458

OntarioBoston

ONT - BOS

ONTBOS

Ontario

Wed 8/12

5:00 am-5:52 pm

2 stops9h 52m

Boston Logan Intl

Tue 8/18

11:00 am-8:53 pm

2 stops12h 53m

$458

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/23

Showing 1-10 of 58 resultsSorted by cheapest first
1
2
3
...
6

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.
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

How much does it cost to fly round-trip from Ontario to Maine?

Airfare is below average for this route at the moment.
Ontario to Maine flights typically cost between $481 and $537 in August.
The cheapest round-trip price found within the last 5 days was $349 on JetBlue (Aug 24-Aug 31).

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 July 26, 2026.
See what other customers who have flown with Southwest,United Airlines, andAmerican 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.
Southwest
8.0
Very good
4,233 reviews

Comfort

8.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.
Southwest
8.0
Very good
4,233 reviews
Southwest
8.0
Very good
4,233 reviews

Comfort

8.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.
United Airlines
7.4
Good
10,035 reviews
Southwest
8.0
Very good
4,233 reviews

Comfort

8.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.
American Airlines
7.1
Good
11,845 reviews
Southwest
8.0
Very good
4,233 reviews

Comfort

8.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.

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.

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

    If you book a flight to Maine from Ontario, you will be flying from 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 Ontario to Maine?

    Southwest, Alaska Airlines, and JetBlue can get you from Ontario to Maine in just under 10h 15m. Your travel time can differ by up to 9h 42m. The distance between Ontario and Maine is about 2559 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    When deciding which route to take from Ontario to Maine consider Ontario - Boston Logan Intl, Ontario - Portland or Ontario - Bangor as they are the most popular.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Maine 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

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.

Alternative routes for Ontario to Maine

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to Newark flights
San Francisco to John F Kennedy Intl flights
Los Angeles to Honolulu flights
San Francisco to LaGuardia flights
Long Beach to Honolulu flights
Ontario to Honolulu flights
Los Angeles to John F Kennedy Intl flights
Burbank to Honolulu flights
Los Angeles to Seattle flights
Los Angeles to Newark flights
Ontario to Seattle flights
San Francisco to Las Vegas flights
Los Angeles to Las Vegas flights
Los Angeles to O'Hare Intl flights
Los Angeles to Dallas/Fort Worth flights
San Francisco to Seattle flights
Los Angeles to LaGuardia flights
Ontario to John F Kennedy Intl flights
Los Angeles to San Francisco flights
San Francisco to Los Angeles flights
Los Angeles to Miami flights
San Francisco to Santa Ana flights
San Francisco to Boston flights
Los Angeles to Hobby flights
Santa Ana to Las Vegas flights
San Francisco to Ontario flights
San Diego to Seattle flights
San Francisco to Dallas/Fort Worth flights
Los Angeles to Boston flights
Ontario to Las Vegas flights
Ontario to San Francisco flights
San Jose to Las Vegas flights
Ontario to O'Hare Intl flights
Los Angeles to Orlando flights
Los Angeles to Portland flights
Los Angeles to Atlanta flights
Santa Ana to San Francisco flights
San Francisco to Honolulu flights
San Francisco to O'Hare Intl flights
Ontario to Dallas/Fort Worth flights
San Jose to Los Angeles flights
Los Angeles to Nashville flights
Los Angeles to George Bush Intcntl flights
San Jose to Seattle flights
Santa Ana to Seattle flights
San Francisco to Denver flights
Los Angeles to Baltimore flights
Los Angeles to Denver flights
San Francisco to San Diego flights

Top 3 airlines flying from Ontario to Maine

Discover the top 3 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 July 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$256Average$525FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$361Average$523FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$409Average$466FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.