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$92+ 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 10/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PWM
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap 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 September 11, 2025.

Round-trip from

$267
(Southwest)

One-way from

$92
(Southwest)

Popular in

November

Cheapest in

January

Average price

$459
From Ontario to Portland
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One-way flight from Ontario to Portland
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Highest demand for flights based on searches. 27% potential increase in price ($180 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 11, 2025.

This Southwest deal was found by Cheapflights users on 9/11. 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.
Fri 11/1412:35 pmONT - PWM
2 stops8h 45mSouthwest
Tue 11/185:30 amPWM - ONT
2 stops12h 10mSouthwest
Deal found 9/11$267
This Trip.com deal was found by Cheapflights users on 9/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/410:56 pmONT - PWM
1 stop11h 26mJetBlue
Sat 10/112:17 pmPWM - ONT
1 stop10h 12mJetBlue
Deal found 9/9$341
This Delta deal was found by Cheapflights users on 9/9. 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.
Mon 11/311:36 amONT - PWM
1 stop7h 43mDelta
Wed 11/121:25 pmPWM - ONT
1 stop9h 12mDelta
Deal found 9/9$345
This Southwest deal was found by Cheapflights users on 9/11. 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 10/2912:00 pmONT - PWM
1 stop7h 30mSouthwest
Mon 11/35:30 amPWM - ONT
2 stops12h 10mSouthwest
Deal found 9/11$351
This Priceline deal was found by Cheapflights users on 9/9. 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 10/610:56 pmONT - PWM
1 stop11h 26mJetBlue
Sat 10/112:17 pmPWM - ONT
1 stop10h 12mJetBlue
Deal found 9/9$359
This United Airlines deal was found by Cheapflights users on 9/11. 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 11/145:05 amONT - PWM
1 stop7h 43mUnited Airlines
Tue 11/183:20 pmPWM - ONT
1 stop8h 24mUnited Airlines
Deal found 9/11$371
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Mon 10/276:38 pmONT - PWM
2 stops12h 26mUnited Airlines
Fri 10/314:54 pmPWM - ONT
1 stop8h 37mUnited Airlines
Deal found 9/9$372
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Mon 10/66:27 pmONT - PWM
2 stops11h 44mUnited Airlines
Sat 10/116:00 amPWM - ONT
2 stops15h 06mUnited Airlines
Deal found 9/9$375
This Priceline deal was found by Cheapflights users on 9/9. 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.
Sun 10/510:56 pmONT - PWM
1 stop11h 26mJetBlue
Sat 10/112:17 pmPWM - ONT
1 stop10h 12mJetBlue
Deal found 9/9$393
This Delta deal was found by Cheapflights users on 9/11. 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.
Wed 10/2911:36 amONT - PWM
1 stop7h 43mDelta
Mon 11/31:27 pmPWM - ONT
1 stop8h 52mDelta
Deal found 9/11$418

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 September 11, 2025.
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

Fri 11/14

12:35 pm-12:20 am

2 stops8h 45m

Portland

Tue 11/18

5:30 am-2:40 pm

2 stops12h 10m

$267

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Mon 11/3

11:36 am-10:19 pm

1 stop7h 43m

Portland

Wed 11/12

1:25 pm-7:37 pm

1 stop9h 12m

$345

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Wed 10/29

5:30 am-7:55 pm

2 stops11h 25m

Portland

Mon 11/3

5:30 am-2:40 pm

2 stops12h 10m

$356

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Mon 10/6

10:56 pm-1:22 pm

1 stop11h 26m

Portland

Sat 10/11

2:17 pm-9:29 pm

1 stop10h 12m

$359

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Fri 11/14

5:05 am-3:48 pm

1 stop7h 43m

Portland

Tue 11/18

3:20 pm-8:44 pm

1 stop8h 24m

$371

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Mon 10/27

6:38 pm-10:04 am

2 stops12h 26m

Portland

Fri 10/31

4:54 pm-10:31 pm

1 stop8h 37m

$372

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Mon 10/6

6:27 pm-9:11 am

2 stops11h 44m

Portland

Sat 10/11

6:00 am-6:06 pm

2 stops15h 06m

$375

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Wed 10/29

11:36 am-10:19 pm

1 stop7h 43m

Portland

Mon 11/3

1:27 pm-7:19 pm

1 stop8h 52m

$418

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Wed 10/1

9:36 am-11:13 pm

2 stops10h 37m

Portland

Sun 10/5

6:14 am-12:51 pm

2 stops9h 37m

$436

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 9/30

6:00 am-11:59 pm

2 stops14h 59m

Portland

Wed 1/14

4:10 pm-10:26 pm

1 stop9h 16m

$453

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 22 results
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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, January is the cheapest month in which you can book a flight from Ontario to Portland, Maine (average of $296). Flying from Ontario to Portland, Maine in July is currently the most expensive (average of $394). 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.

What is the cheapest time of day to fly from ONT to PWM?

Find hourly flight availability from Ontario to Portland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

A simple way to save on the total cost of your ticket is to fly from Ontario to Portland, Maine in the afternoon. If you’re flexible enough to do this you can expect to save up to 36% on your trip compared to booking a flight in the morning.

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 September 11, 2025.
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
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
JetBlue
7.2
Good
2,913 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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 7h 43m. Fly via Southwest, Delta, or JetBlue 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 $266, 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 Delta and JetBlue - these airlines can fly you to your destination from $287 and $331, respectively. American Airlines is 45% 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.

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

    Currently, January is the cheapest month in which you can book a flight from Ontario to Portland, Maine (average of $296). Flying from Ontario to Portland, Maine in July is currently the most expensive (average of $394). 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
Brunswick
North Conway
Auburn
Conway
Lewiston

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Top 5 airlines flying from Ontario to Portland

Discover the top 5 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$266Average$468FlexibilityNo cancel feeOn-time71%
DeltaCheapest$287Average$491FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$331Average$471FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$356Average$527FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$391Average$691FlexibilityNo cancel feeOn-time63%

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