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$131+ Cheap flights from Portland, ME to Ontario (PWM - ONT)

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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — ONT
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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Cheap flight deals from Portland to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to Ontario (ONT). 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 August 18, 2025.

Round-trip from

$291
(JetBlue)

One-way from

$131
(American Airlines)

Popular in

December

Cheapest in

May

Average price

$719
From Portland to Ontario
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One-way flight from Portland to Ontario
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Highest demand for flights based on searches. 18% potential increase in price ($135 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($36 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Portland to Ontario

Cheapest flights from Portland to Ontario
Explore the most affordable flight options available from Portland to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

This JetBlue deal was found by Cheapflights users on 8/18. 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.
Thu 9/182:17 pmPWM - ONT
1 stop10h 12mJetBlue
Tue 9/2310:56 pmONT - PWM
1 stop11h 26mJetBlue
Deal found 8/18$291
This JetBlue deal was found by Cheapflights users on 8/18. 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.
Fri 10/32:17 pmPWM - ONT
1 stop10h 12mJetBlue
Tue 10/710:56 pmONT - PWM
1 stop11h 26mJetBlue
Deal found 8/18$320
This JetBlue deal was found by Cheapflights users on 8/18. 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.
Thu 9/42:17 pmPWM - ONT
1 stop10h 12mJetBlue
Mon 9/810:56 pmONT - PWM
1 stop11h 25mJetBlue
Deal found 8/18$322
This JetBlue deal was found by Cheapflights users on 8/16. 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.
Wed 10/82:17 pmPWM - ONT
1 stop10h 12mJetBlue
Mon 10/1310:56 pmONT - PWM
1 stop11h 26mJetBlue
Deal found 8/16$342
This JetBlue deal was found by Cheapflights users on 8/16. 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.
Wed 9/32:17 pmPWM - ONT
1 stop10h 12mJetBlue
Tue 9/910:56 pmONT - PWM
1 stop11h 26mJetBlue
Deal found 8/16$352
This JetBlue deal was found by Cheapflights users on 8/18. 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.
Fri 9/262:17 pmPWM - ONT
1 stop10h 12mJetBlue
Sun 9/2810:56 pmONT - PWM
1 stop11h 26mJetBlue
Deal found 8/18$413
This JetBlue deal was found by Cheapflights users on 8/15. 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.
Thu 10/92:17 pmPWM - ONT
1 stop10h 12mJetBlue
Mon 10/1310:56 pmONT - PWM
1 stop11h 26mJetBlue
Deal found 8/15$422
This United Airlines deal was found by Cheapflights users on 8/16. 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.
Wed 9/34:56 pmPWM - ONT
1 stop8h 34mUnited Airlines
Tue 9/96:50 pmONT - PWM
2 stops11h 34mUnited Airlines
Deal found 8/16$427
This United Airlines deal was found by Cheapflights users on 8/15. 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.
Thu 10/26:14 amPWM - ONT
2 stops14h 09mUnited Airlines
Mon 10/66:36 pmONT - PWM
2 stops11h 35mUnited Airlines
Deal found 8/15$447
This United Airlines deal was found by Cheapflights users on 8/17. 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.
Thu 9/43:35 pmPWM - ONT
1 stop8h 08mUnited Airlines
Mon 9/86:38 pmONT - PWM
2 stops11h 46mUnited Airlines
Deal found 8/17$450

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland to Ontario 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 August 18, 2025.
Use the filters below to find and compare flights from Portland to Ontario that are best for you.

Fly from

Portland

Fly to

Ontario

Route

Depart

Return

Price

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 9/18

2:17 pm-9:29 pm

1 stop10h 12m

Ontario

Tue 9/23

10:56 pm-1:22 pm

1 stop11h 26m

$291

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 10/1

2:17 pm-9:29 pm

1 stop10h 12m

Ontario

Tue 10/7

10:56 pm-1:22 pm

1 stop11h 26m

$291

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 10/2

2:17 pm-9:29 pm

1 stop10h 12m

Ontario

Mon 10/6

10:56 pm-1:22 pm

1 stop11h 26m

$291

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 9/30

2:17 pm-9:29 pm

1 stop10h 12m

Ontario

Sat 10/4

10:56 pm-1:22 pm

1 stop11h 26m

$291

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 9/18

2:17 pm-9:29 pm

1 stop10h 12m

Ontario

Mon 9/22

10:56 pm-1:21 pm

1 stop11h 25m

$291

PortlandOntario

PWM - ONT

PWMONT

Portland

Fri 10/3

2:17 pm-9:29 pm

1 stop10h 12m

Ontario

Tue 10/7

10:56 pm-1:22 pm

1 stop11h 26m

$320

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 9/4

2:17 pm-9:29 pm

1 stop10h 12m

Ontario

Tue 9/9

10:56 pm-1:22 pm

1 stop11h 26m

$322

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 9/4

2:17 pm-9:29 pm

1 stop10h 12m

Ontario

Mon 9/8

10:56 pm-1:21 pm

1 stop11h 25m

$322

PortlandOntario

PWM - ONT

PWMONT

Portland

Fri 9/5

2:17 pm-9:29 pm

1 stop10h 12m

Ontario

Tue 9/9

10:56 pm-1:22 pm

1 stop11h 26m

$322

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 10/8

2:17 pm-9:29 pm

1 stop10h 12m

Ontario

Mon 10/13

10:56 pm-1:22 pm

1 stop11h 26m

$342

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/17

Showing 1-10 of 20 results
1
2

Best time to book a flight from Portland to Ontario

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

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

Currently, August is the cheapest month in which you can book a flight from Portland, Maine to Ontario (average of $246). Flying from Portland, Maine to Ontario in March is currently the most expensive (average of $328). 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 Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated August 18, 2025.
Read reviews from past customers who have flown Delta and American Airlines from Portland to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Portland to Ontario. 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 Portland, Maine to Ontario?

    Airlines like JetBlue fly from Portland, Maine to Ontario in about 10h 12m. The time it takes to get you to your destination can typically vary by up to . There are 2590 mi between Portland, Maine and Ontario.

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

    American Airlines, at $279, was found to be the cheapest airline from Portland, Maine to Ontario. An alternate airline flying to your destination would be Delta. Users have found that American Airlines is 52% cheaper than the other options available to this destination.

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

    The cheapest airlines for a one-way flight from Portland, Maine to Ontario are American Airlines ($131), Southwest ($139), and JetBlue ($156).

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Portland to Ontario 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 Portland, Maine to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Portland, Maine to Ontario (average of $246). Flying from Portland, Maine to Ontario in March is currently the most expensive (average of $328). 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

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Alternative routes for Portland to Ontario

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Top 2 airlines flying from Portland to Ontario

Discover the top 2 airlines that operate flights from Portland to Ontario. 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 August 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$279Average$592FlexibilityNo cancel feeOn-time71%
DeltaCheapest$302Average$442FlexibilityNo cancel feeOn-timeN/A

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