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$126+ 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 8/23. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PWM
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 July 29, 2025.

Round-trip from

$267
(American Airlines)

One-way from

$126
(American Airlines)

Popular in

November

Cheapest in

January

Average price

$618
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. 25% potential increase in price ($161 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 29, 2025.

This American Airlines deal was found by Cheapflights users on 7/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/3011:59 pmONT - PWM
1 stop10h 52mAmerican Airlines
Thu 9/112:43 pmPWM - ONT
1 stop9h 28mAmerican Airlines
Deal found 7/26$267
This JetBlue deal was found by Cheapflights users on 7/27. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/910:56 pmONT - PWM
1 stop11h 26mJetBlue
Wed 9/172:17 pmPWM - ONT
1 stop10h 12mJetBlue
Deal found 7/27$291
This United Airlines deal was found by Cheapflights users on 7/29. 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 8/257:00 amONT - PWM
1 stop7h 42mUnited Airlines
Thu 8/284:56 pmPWM - ONT
1 stop8h 34mUnited Airlines
Deal found 7/29$297
This Delta deal was found by Cheapflights users on 7/28. 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 8/3011:45 amONT - PWM
1 stop9h 18mDelta
Thu 9/111:35 pmPWM - ONT
1 stop8h 40mDelta
Deal found 7/28$328
This Southwest deal was found by Cheapflights users on 7/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/812:45 pmONT - PWM
1 stop7h 35mSouthwest
Fri 9/122:00 pmPWM - ONT
2 stops11h 45mSouthwest
Deal found 7/27$394

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 29, 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

Sat 8/30

11:59 pm-1:51 pm

1 stop10h 52m

Portland

Thu 9/11

2:43 pm-9:11 pm

1 stop9h 28m

$267

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 9/9

10:56 pm-1:22 pm

1 stop11h 26m

Portland

Wed 9/17

2:17 pm-9:29 pm

1 stop10h 12m

$291

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Mon 8/25

7:00 am-5:42 pm

1 stop7h 42m

Portland

Thu 8/28

4:56 pm-10:30 pm

1 stop8h 34m

$297

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Sat 8/30

11:45 am-12:03 am

1 stop9h 18m

Portland

Thu 9/11

1:35 pm-7:15 pm

1 stop8h 40m

$328

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Mon 9/8

12:45 pm-11:20 pm

1 stop7h 35m

Portland

Fri 9/12

2:00 pm-10:45 pm

2 stops11h 45m

$394

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Sat 8/23

6:10 am-6:39 pm

1 stop9h 29m

$126

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Mon 8/25

11:45 am-12:03 am

1 stop9h 18m

$148

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Tue 9/2

11:59 pm-1:22 pm

1 stop10h 23m

$156

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Fri 10/31

5:05 am-3:48 pm

1 stop7h 43m

$169

OntarioPortland

ONT - PWM

ONTPWM

Ontario

Thu 8/14

5:21 pm-11:45 am

2 stops15h 24m

$221

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 11 results
1
2

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 July 29, 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 July 29, 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
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Southwest
8.0
Very good
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Delta
8.0
Very good
7,977 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
United Airlines
7.4
Good
8,899 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
JetBlue
7.3
Good
2,913 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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.

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

    Currently priced at $267, 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 JetBlue and United Airlines - these airlines can fly you to your destination from $291 and $297, respectively. American Airlines is 44% 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?

    $126 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 Delta and JetBlue, with prices starting from $148 and $156, 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, 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$259Average$439FlexibilityNo cancel feeOn-time62%
DeltaCheapest$287Average$491FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$300Average$451FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$356Average$447FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$523Average$727FlexibilityNo cancel feeOn-time63%

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