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$176+ Cheap flights from Ontario to Portland, ME (ONT - PWM)

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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PWM
Aug 22 — Aug 291
Sat 8/22
Sat 8/29
1 adult, Economy
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Find cheap flights from Ontario to Portland 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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3. Compare prices and book

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Cheap flight deals from Ontario to Portland

Cheapest flights from Ontario to Portland
Explore the most affordable flight options available from Ontario to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 23, 2026.

This Delta deal was found by Cheapflights users on 7/19. 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 10/2012:18 pm
ONT
-
PWM
1 stop8h 18m
Delta
Fri 10/232:09 pm
PWM
-
ONT
1 stop10h 52m
Delta
Deal found 7/19$351
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.
Wed 8/126:15 am
ONT
-
PWM
2 stops13h 33m
American Airlines
Thu 8/208:00 am
PWM
-
ONT
1 stop8h 31m
American Airlines
Deal found 7/22$356
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.
Tue 9/1512:17 pm
ONT
-
PWM
1 stop8h 11m
Delta
Thu 9/176:00 am
PWM
-
ONT
1 stop8h 05m
Delta
Deal found 7/22$361
This American Airlines deal was found by Cheapflights users on 7/19. 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.
Sun 8/167:05 am
ONT
-
PWM
1 stop10h 01m
American Airlines
Sun 8/235:30 am
PWM
-
ONT
2 stops11h 01m
American Airlines
Deal found 7/19$366
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/59:55 am
ONT
-
PWM
2 stops10h 55m
Southwest
Wed 11/115:10 am
PWM
-
ONT
2 stops12h 30m
Southwest
Deal found 7/20$376
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 8/1312:00 pm
ONT
-
PWM
1 stop8h 13m
Delta
Thu 8/202:14 pm
PWM
-
ONT
1 stop10h 38m
Delta
Deal found 7/22$390
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/189:40 am
ONT
-
PWM
2 stops9h 25m
Southwest
Tue 8/255:45 am
PWM
-
ONT
2 stops11h 20m
Southwest
Deal found 7/20$391
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1111:59 pm
ONT
-
PWM
1 stop10h 46m
JetBlue
Thu 8/202:40 pm
PWM
-
ONT
1 stop10h 58m
JetBlue
Deal found 7/21$393
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:15 am
ONT
-
PWM
2 stops12h 45m
American Airlines
Tue 8/258:00 am
PWM
-
ONT
1 stop8h 31m
American Airlines
Deal found 7/20$407
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1711:59 pm
ONT
-
PWM
1 stop9h 31m
JetBlue
Mon 8/242:40 pm
PWM
-
ONT
1 stop10h 58m
JetBlue
Deal found 7/20$409
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1511:13 pm
ONT
-
PWM
1 stop10h 08m
JetBlue
Sat 8/222:40 pm
PWM
-
ONT
1 stop10h 19m
JetBlue
Deal found 7/20$410

Find flight deals from Ontario to Portland

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Portland (PWM). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$351
(Delta)

One-way from

$176
(Delta)

Popular in

March

Cheapest in

August

Average price

$612
Provider with most accurate pricing for Ontario-Portland flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Portland flights.
Search Deals
From Ontario to Portland
Search Deals
One-way flight from Ontario to Portland
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($90 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($29 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 Portland 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 23, 2026.
Use the filters below to find and compare flights from Ontario to Portland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 9/15

8:35 am-10:05 pm

2 stops10h 30m

Portland

Tue 9/22

5:45 am-1:10 pm

2 stops10h 25m

$361

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Sat 8/15

11:13 pm-12:21 pm

1 stop10h 08m

Portland

Sat 8/22

2:40 pm-9:59 pm

1 stop10h 19m

$410
Quickest round-trip

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 11/17

5:00 am-4:02 pm

1 stop8h 02m

Portland

Wed 11/18

3:27 pm-8:56 pm

1 stop8h 29m

$461

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Sat 8/22

5:00 am-6:29 pm

2 stops10h 29m

Portland

Sat 8/29

5:03 pm-10:35 pm

1 stop8h 32m

$473

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Mon 10/5

11:55 pm-10:55 am

1 stop8h 00m

Portland

Tue 10/13

9:20 am-4:50 pm

2 stops10h 30m

$475

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 9/1

11:59 pm-1:45 pm

1 stop10h 46m

Portland

Tue 9/8

1:17 pm-10:35 pm

1 stop12h 18m

$484

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Thu 11/19

10:59 pm-12:18 pm

1 stop10h 19m

Portland

Thu 11/26

6:30 am-6:18 pm

2 stops14h 48m

$534

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Mon 8/10

11:59 pm-12:21 pm

1 stop9h 22m

Portland

Mon 8/17

1:25 pm-10:38 pm

1 stop12h 13m

$541
Cheapest one-way

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Thu 8/27

12:00 pm-11:13 pm

1 stop8h 13m

$176

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Fri 8/28

12:00 pm-11:13 pm

1 stop8h 13m

$181

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/20

Showing 1-10 of 18 resultsSorted by cheapest first
1
2

Compare providers for flights from Ontario to Portland

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Portland in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Portland, Maine flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Portland, Maine flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Portland, Maine flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Portland, Maine flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Portland, Maine flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Portland

Have a flexible travel schedule? Discover the best time to fly to Portland 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 Portland

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

Airfare is below average for this route at the moment.

Ontario to Portland, Maine flights typically cost between $481 and $537 in October.
The cheapest round-trip price found within the last 5 days was $351 on Delta (Oct 20-Oct 23).

Reviews of airlines servicing Portland

Get insights into the airlines that provide service to Portland. 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 Portland. Reviews last updated July 23, 2026.
Peruse reviews from past customers who have flown with Southwest,United Airlines, andAmerican Airlines from Ontario to Portland to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Entertainment

7.5

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
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Entertainment

7.5

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
10,025 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Entertainment

7.5

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
11,834 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Entertainment

7.5

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 Portland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Ontario to Portland, Maine?

    There are many flights that can get you from Ontario to Portland, Maine in 8h 18m. Fly via Delta, American Airlines, or Southwest to get the fastest option. There are 2590 mi between Ontario and Portland, Maine. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Ontario to Portland, Maine round-trip?

    Currently priced at $256, American Airlines will fly you from Ontario to Portland, Maine and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Southwest and United Airlines - these airlines can fly you to your destination from $383 and $397, respectively. American Airlines is 52% cheaper than the average price of flights available within the next 90 days to this destination.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Portland 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

Traveling to a place near Portland?

Book flights to Portland if you plan to visit one of these locations
North Conway
Lewiston
Brunswick
Conway

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from Ontario to Portland

Discover the top 3 airlines that operate flights from Ontario to Portland. 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 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$256Average$497FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$383Average$523FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$397Average$457FlexibilityNo cancel feeOn-time69%

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