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Cheap flights from Ontario to Boston from $140

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Boston departing on 5/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to Boston

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
4:52 pm - 10:07 am
ONT
-
PWM
14h 15m
2 stops
American Airlines Logo
7:07 am - 6:30 pm
PWM
-
ONT
14h 23m
2 stops
$327American Airlines
Tue, Apr 28 - Wed, May 6
Delta Logo
10:15 pm - 11:02 am
ONT
-
PWM
9h 47m
2 stops
Delta Logo
5:21 am - 11:36 am
PWM
-
ONT
9h 15m
1 stop
$348Delta
Tue, Apr 28 - Wed, May 6
Delta Logo
10:15 pm - 11:02 am
ONT
-
PWM
9h 47m
2 stops
Delta Logo
5:21 am - 11:36 am
PWM
-
ONT
9h 15m
1 stop
$354Delta
Tue, Apr 28 - Wed, May 6
American Airlines Logo
11:59 pm - 3:09 pm
ONT
-
PWM
12h 10m
2 stops
American Airlines Logo
3:39 pm - 11:46 pm
PWM
-
ONT
11h 07m
2 stops
$360American Airlines
Tue, Apr 28 - Wed, May 6
American Airlines Logo
4:52 pm - 10:07 am
ONT
-
PWM
14h 15m
2 stops
American Airlines Logo
3:39 pm - 11:46 pm
PWM
-
ONT
11h 07m
2 stops
$365American Airlines
Tue, Apr 28 - Wed, May 6
American Airlines Logo
4:52 pm - 10:07 am
ONT
-
PWM
14h 15m
2 stops
American Airlines Logo
3:39 pm - 11:46 pm
PWM
-
ONT
11h 07m
2 stops
$369American Airlines
Tue, Apr 28 - Wed, May 6
American Airlines Logo
10:26 pm - 11:15 am
ONT
-
PWM
9h 49m
1 stop
American Airlines Logo
3:39 pm - 11:46 pm
PWM
-
ONT
11h 07m
2 stops
$379American Airlines
Tue, Apr 7 - Wed, Apr 15
Delta Logo
12:57 pm - 11:22 pm
ONT
-
PWM
7h 25m
1 stop
Delta Logo
5:48 pm - 11:47 am
PWM
-
ONT
20h 59m
2 stops
$382Delta
Tue, Mar 10 - Mon, Mar 23
Delta Logo
12:57 pm - 11:22 pm
ONT
-
PWM
7h 25m
1 stop
Delta Logo
5:23 am - 11:47 am
PWM
-
ONT
9h 24m
1 stop
$383Delta
Tue, Mar 10 - Sun, Mar 22
American Airlines Logo
11:59 pm - 3:09 pm
ONT
-
PWM
12h 10m
2 stops
American Airlines Logo
3:39 pm - 11:46 pm
PWM
-
ONT
11h 07m
2 stops
$385American Airlines
Tue, Apr 7 - Wed, Apr 15

American Airlines flights from Ontario to Portland, Maine

Our best American Airlines deals on Ontario to Portland, Maine flight tickets
American Airlines
Apr 28
ONT4:52 pmOntario
14h 15m
2 stops
PWM10:07 amPortland
May 6
PWM7:07 amPortland
14h 23m
2 stops
ONT6:30 pmOntario
$327
American Airlines
Apr 28
ONT11:59 pmOntario
12h 10m
2 stops
PWM3:09 pmPortland
May 6
PWM3:39 pmPortland
11h 07m
2 stops
ONT11:46 pmOntario
$360
American Airlines
Apr 28
ONT4:52 pmOntario
14h 15m
2 stops
PWM10:07 amPortland
May 6
PWM3:39 pmPortland
11h 07m
2 stops
ONT11:46 pmOntario
$365

Delta flights from Ontario to Portland, Maine

Our best Delta deals on Ontario to Portland, Maine flight tickets
Delta
Apr 28
ONT10:15 pmOntario
9h 47m
2 stops
PWM11:02 amPortland
May 6
PWM5:21 amPortland
9h 15m
1 stop
ONT11:36 amOntario
$348
Delta
Apr 28
ONT10:15 pmOntario
9h 47m
2 stops
PWM11:02 amPortland
May 6
PWM5:21 amPortland
9h 15m
1 stop
ONT11:36 amOntario
$354
Delta
Mar 10
ONT12:57 pmOntario
7h 25m
1 stop
PWM11:22 pmPortland
Mar 23
PWM5:48 pmPortland
20h 59m
2 stops
ONT11:47 amOntario
$382

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Portland, 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, momondo users made 832,500 searches. Data last updated February 17, 2026.
Use the filters below to find and compare flights from Ontario to Portland, Maine that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 4/28

4:52 pm-10:07 am

2 stops14h 15m

Portland

Wed 5/6

7:07 am-6:30 pm

2 stops14h 23m

$327

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 4/28

10:15 pm-11:02 am

2 stops9h 47m

Portland

Wed 5/6

5:21 am-11:36 am

1 stop9h 15m

$348

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 4/28

10:15 pm-11:02 am

2 stops9h 47m

Portland

Wed 5/6

5:21 am-11:36 am

1 stop9h 15m

$354

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 4/28

11:59 pm-3:09 pm

2 stops12h 10m

Portland

Wed 5/6

3:39 pm-11:46 pm

2 stops11h 07m

$360

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 4/28

4:52 pm-10:07 am

2 stops14h 15m

Portland

Wed 5/6

3:39 pm-11:46 pm

2 stops11h 07m

$365

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 4/28

4:52 pm-10:07 am

2 stops14h 15m

Portland

Wed 5/6

3:39 pm-11:46 pm

2 stops11h 07m

$369

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 4/7

10:26 pm-11:15 am

1 stop9h 49m

Portland

Wed 4/15

3:39 pm-11:46 pm

2 stops11h 07m

$379

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 3/10

12:57 pm-11:22 pm

1 stop7h 25m

Portland

Mon 3/23

5:48 pm-11:47 am

2 stops20h 59m

$382

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 3/10

12:57 pm-11:22 pm

1 stop7h 25m

Portland

Sun 3/22

5:23 am-11:47 am

1 stop9h 24m

$383

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 4/7

11:59 pm-3:09 pm

2 stops12h 10m

Portland

Wed 4/15

3:39 pm-11:46 pm

2 stops11h 07m

$385

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Boston from

How to get the cheapest flight ticket from Ontario to Portland, Maine

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Can stopping save me money on Ontario to Portland, Maine flights?

You could potentially save up to 27% on your flight if you consider stops on a Ontario to Portland, Maine flight.

How have Ontario to Portland, Maine flight prices changed over time?

When to book flights from Ontario to Portland, Maine

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Portland, Maine according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Portland, Maine (ONT to PWM) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Portland, Maine

Fastest flight time

7h 25m

Direct flights

None
The fastest flight from Ontario to Portland, Maine takes 7h 25m
There are no direct flights from Ontario to Portland, Maine. There are no popular flight routes from Ontario to Portland, Maine.
Search flight deals

  • How far is Ontario to Portland by plane?

    Ontario and Portland are 2595.5 mi apart from one another. A reasonable flight in good conditions will take 7h 25m.

  • When did momondo last update prices for flights from Ontario Airport to Portland Airport?

    Prices for flights from Ontario Airport to Portland Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to Portland Airport?

  • How old do you have to be to fly from Ontario Airport to Portland Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Portland Airport.

  • What documentation or ID do you need to fly to Portland Airport?

    The travel and health documents you'll need for your trip to Portland Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Portland Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ontario to Portland, Maine?

Best airlines flying from Ontario to Portland, Maine

Compare and see reviews for airlines that fly from Ontario to Portland, Maine with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $148Free CancellationRating
7.9
8,206 reviews
Search Delta flights
American AirlinesPriceFrom $266Free CancellationRating
7.2
11,294 reviews
Search American Airlines flights
United AirlinesPriceFrom $380Free CancellationRating
7.4
9,308 reviews
Search United Airlines flights
SouthwestPriceFrom $383Free CancellationRating
8.0
4,289 reviews
Search Southwest flights

Traveling to a place near Boston?

Book flights to Boston if you plan to visit one of these locations
North Conway
Boothbay Harbor
Jackson
Conway
Freeport
Lewiston
Brunswick
Bartlett
Gorham
Auburn
Windham
Intervale
Bath
Oxford
Georgetown
Falmouth
Tamworth

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Portland?

Finding the right flight to Portland from Ontario is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Portland quick and easy, saving you time and money.

Can I find flights from Ontario to Portland with flexible booking policies on momondo?

All flight searches from Ontario to Portland on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Ontario to Portland?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Portland.

I’m not ready to book a flight from Ontario to Portland right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Ontario to Portland flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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