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Portland

$149+ 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 4/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PWM
Feb 26 — Mar 51
Thu 2/26
Thu 3/5
1 adult, Economy
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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 January 27, 2026.

This Delta deal was found by Cheapflights users on 1/27. 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.
Sat 8/227:00 am
ONT
-
PWM
1 stop8h 07m
Delta
Wed 9/21:35 pm
PWM
-
ONT
1 stop11h 21m
Delta
Deal found 1/27$297
This Delta deal was found by Cheapflights users on 1/27. 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 8/2310:59 pm
ONT
-
PWM
1 stop10h 23m
Delta
Wed 9/212:50 pm
PWM
-
ONT
2 stops12h 06m
Delta
Deal found 1/27$302
This Delta deal was found by Cheapflights users on 1/26. 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 8/77:00 am
ONT
-
PWM
1 stop8h 07m
Delta
Thu 8/131:35 pm
PWM
-
ONT
1 stop11h 21m
Delta
Deal found 1/26$328
This Delta deal was found by Cheapflights users on 1/26. 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 4/2810:15 pm
ONT
-
PWM
2 stops14h 42m
Delta
Wed 5/65:21 am
PWM
-
ONT
1 stop9h 15m
Delta
Deal found 1/26$333
This Delta deal was found by Cheapflights users on 1/26. 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 8/67:00 am
ONT
-
PWM
1 stop8h 07m
Delta
Thu 8/131:35 pm
PWM
-
ONT
1 stop11h 21m
Delta
Deal found 1/26$358
This American Airlines deal was found by Cheapflights users on 1/25. 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 4/2811:59 pm
ONT
-
PWM
2 stops13h 41m
American Airlines
Wed 5/611:56 am
PWM
-
ONT
2 stops13h 39m
American Airlines
Deal found 1/25$365
This JetBlue deal was found by Cheapflights users on 1/24. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/2511:25 pm
ONT
-
PWM
1 stop10h 58m
JetBlue
Sat 5/302:18 pm
PWM
-
ONT
1 stop10h 51m
JetBlue
Deal found 1/24$366
This Southwest deal was found by Cheapflights users on 1/25. 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 2/267:20 pm
ONT
-
PWM
2 stops12h 55m
Southwest
Mon 3/92:50 pm
PWM
-
ONT
2 stops10h 35m
Southwest
Deal found 1/25$369
This Southwest deal was found by Cheapflights users on 1/26. 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 6/169:40 pm
ONT
-
PWM
1 stop9h 15m
Southwest
Wed 6/245:30 am
PWM
-
ONT
1 stop9h 35m
Southwest
Deal found 1/26$389
This United Airlines deal was found by Cheapflights users on 1/25. 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 10/275:00 am
ONT
-
PWM
1 stop7h 49m
United Airlines
Thu 10/294:48 pm
PWM
-
ONT
1 stop8h 38m
United Airlines
Deal found 1/25$397

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 January 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$333
(Delta)

One-way from

$149
(Delta)

Popular in

July

Cheapest in

April

Average price

$407
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. 8% potential increase in price ($42 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 27, 2026.
Use the filters below to find and compare flights from Ontario to Portland that are best for you.

Fly from

Ontario

Fly to

Portland

Route

Depart

Return

Price

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 4/28

10:15 pm-3:57 pm

2 stops14h 42m

Portland

Wed 5/6

5:21 am-11:36 am

1 stop9h 15m

$333

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 4/7

12:57 pm-11:22 pm

1 stop7h 25m

Portland

Wed 4/15

12:46 pm-11:44 pm

2 stops13h 58m

$333

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Mon 5/25

11:25 pm-1:23 pm

1 stop10h 58m

Portland

Sat 5/30

2:18 pm-10:09 pm

1 stop10h 51m

$366

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Thu 2/26

7:20 pm-11:15 am

2 stops12h 55m

Portland

Mon 3/9

2:50 pm-10:25 pm

2 stops10h 35m

$369

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 4/28

11:59 pm-4:40 pm

2 stops13h 41m

Portland

Wed 5/6

11:56 am-10:35 pm

2 stops13h 39m

$387

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 6/16

9:40 pm-9:55 am

1 stop9h 15m

Portland

Wed 6/24

10:30 am-5:35 pm

2 stops10h 05m

$424

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Wed 6/17

11:55 pm-12:20 pm

2 stops9h 25m

Portland

Wed 6/24

5:30 am-12:05 pm

1 stop9h 35m

$438

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Sat 4/18

12:49 pm-11:23 pm

1 stop7h 34m

$149

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Sat 5/16

11:25 pm-1:23 pm

1 stop10h 58m

$169

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Mon 5/18

11:25 pm-1:23 pm

1 stop10h 58m

$169

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 16 results
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 January.
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

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

Currently, April is the cheapest month in which you can book a flight from Ontario to Portland, Maine (average of $85). Flying from Ontario to Portland, Maine in July is currently the most expensive (average of $188). 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.

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 January 27, 2026.
Peruse reviews from past customers who have flown with Southwest, Delta, and United 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
4,268 reviews

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Southwest
8.0
Very good
4,268 reviews
Southwest
8.0
Very good
4,268 reviews

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Delta
7.9
Good
8,118 reviews
Southwest
8.0
Very good
4,268 reviews

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
United Airlines
7.4
Good
9,205 reviews
Southwest
8.0
Very good
4,268 reviews

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
American Airlines
7.2
Good
11,197 reviews
Southwest
8.0
Very good
4,268 reviews

Food

7.0

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

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 10h 58m. Fly via Delta, JetBlue, 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 $148, Delta will fly you from Ontario to Portland, Maine and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from American Airlines and United Airlines - these airlines can fly you to your destination from $266 and $380, respectively. Delta is 67% cheaper than the average price of flights available within the next 90 days to this destination.

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

    $125 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Southwest and Delta, with prices starting from $148 and $148, respectively.

  • 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.

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

    Currently, April is the cheapest month in which you can book a flight from Ontario to Portland, Maine (average of $85). Flying from Ontario to Portland, Maine in July is currently the most expensive (average of $188). 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

Traveling to a place near Portland?

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

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Top 4 airlines flying from Ontario to Portland

Discover the top 4 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 January 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$148Average$296FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$266Average$407FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$380Average$457FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$383Average$585FlexibilityNo cancel feeOn-time63%

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