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$162+ Cheap flights from Portland, ME (PWM) to Ontario

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 8/26. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — YYZ
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheap flight deals from Portland to Ontario

Keep the following information in mind while searching for Portland to Ontario flight deals. Data was last updated July 29, 2025.

Round-trip from

$348
(Delta)

One-way from

$162
(Delta)

Popular in

June

Cheapest in

March

Average price

$561
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. 12% potential increase in price ($73 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($15 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 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 July 29, 2025.

This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/266:00 amPWM - YYZ
1 stop17h 43mDelta
Tue 9/26:04 amYYZ - PWM
1 stop7h 52mDelta
Deal found 7/27$348
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/307:00 amPWM - YUL
1 stop13h 04mDelta
Fri 9/511:00 amYUL - PWM
1 stop12h 25mDelta
Deal found 7/27$396
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.
Wed 9/107:05 amPWM - YYZ
1 stop15h 58mAmerican Airlines
Tue 9/1610:40 amYYZ - PWM
1 stop9h 31mAmerican Airlines
Deal found 7/26$408
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/68:40 amPWM - YUL
1 stop25h 06mAmerican Airlines
Sat 9/1310:34 amYUL - PWM
1 stop25h 57mAmerican Airlines
Deal found 7/27$440
This United 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:00 amPWM - YYZ
1 stop7h 47mMultiple Airlines
Wed 9/1012:00 pmYYZ - PWM
2 stops11h 03mMultiple Airlines
Deal found 7/26$522
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/106:14 amPWM - YYZ
1 stop9h 32mUnited Airlines
Wed 9/171:00 pmYYZ - PWM
1 stop8h 59mUnited Airlines
Deal found 7/27$538
This United 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/156:00 amPWM - YUL
1 stop16h 06mMultiple Airlines
Tue 9/168:10 amYUL - PWM
1 stop14h 53mMultiple Airlines
Deal found 7/29$603
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1110:39 amPWM - YUL
1 stop5h 31mUnited Airlines
Thu 9/189:15 amYUL - PWM
1 stop5h 10mUnited Airlines
Deal found 7/28$712
This WestJet 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1111:34 amPWM - YUL
2 stops12h 53mWestJet
Thu 9/184:55 pmYUL - PWM
1 stop23h 10mWestJet
Deal found 7/28$823

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 July 29, 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

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Tue 8/26

6:00 am-11:43 pm

1 stop17h 43m

Toronto Pearson Intl

Tue 9/2

6:04 am-1:56 pm

1 stop7h 52m

$348

PortlandMontreal

PWM - YUL

PWMYUL

Portland

Sat 8/30

7:00 am-8:04 pm

1 stop13h 04m

Montreal Pierre Elliott Trudeau Intl

Fri 9/5

11:00 am-11:25 pm

1 stop12h 25m

$396

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Wed 9/10

7:05 am-11:03 pm

1 stop15h 58m

Toronto Pearson Intl

Tue 9/16

10:40 am-8:11 pm

1 stop9h 31m

$408

PortlandMontreal

PWM - YUL

PWMYUL

Portland

Sat 9/6

8:40 am-9:46 am

1 stop25h 06m

Montreal Pierre Elliott Trudeau Intl

Sat 9/13

10:34 am-12:31 pm

1 stop25h 57m

$440

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Thu 9/4

6:00 am-1:47 pm

1 stop7h 47m

Toronto Pearson Intl

Wed 9/10

12:00 pm-11:03 pm

2 stops11h 03m

$522

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Wed 9/10

6:14 am-3:46 pm

1 stop9h 32m

Toronto Pearson Intl

Wed 9/17

1:00 pm-9:59 pm

1 stop8h 59m

$538

PortlandMontreal

PWM - YUL

PWMYUL

Portland

Mon 9/15

6:00 am-10:06 pm

1 stop16h 06m

Montreal Pierre Elliott Trudeau Intl

Tue 9/16

8:10 am-11:03 pm

1 stop14h 53m

$603

PortlandMontreal

PWM - YUL

PWMYUL

Portland

Thu 9/11

10:39 am-4:10 pm

1 stop5h 31m

Montreal Pierre Elliott Trudeau Intl

Thu 9/18

9:15 am-2:25 pm

1 stop5h 10m

$712

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Thu 8/21

11:48 am-6:04 pm

2 stops30h 16m

Toronto Pearson Intl

Tue 8/26

6:15 am-12:59 pm

1 stop6h 44m

$778

PortlandMontreal

PWM - YUL

PWMYUL

Portland

Thu 9/11

11:34 am-12:27 am

2 stops12h 53m

Montreal Pierre Elliott Trudeau Intl

Thu 9/18

4:55 pm-4:05 pm

1 stop23h 10m

$823

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 18 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 Region of Ontario?

Currently, January is the cheapest month in which you can book a flight from Portland, Maine to Region of Ontario (average of $243). Flying from Portland, Maine to Region of Ontario in August is currently the most expensive (average of $348). 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 PWM to ON?

Find hourly flight availability from Portland to Ontario. 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.

When flying from Portland, Maine to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 July 29, 2025.
Read reviews from past customers who have flown Delta, United Airlines, and American Airlines from Portland to Ontario. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,979 reviews

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,979 reviews
Delta
8.0
Very good
7,979 reviews

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,896 reviews
Delta
8.0
Very good
7,979 reviews

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,979 reviews

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
WestJet
7.2
Good
2,972 reviews
Delta
8.0
Very good
7,979 reviews

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

  • What airport do you fly from for flights from Portland to Ontario?

    For a flight from Portland to Ontario, you will be flying from Portland. Portland (PWM) is just 2.9 mi from the center of the city.

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

    One-way options have recently been found by users for as low as $162 on Delta. Other airlines that offer cheap prices include American Airlines from $196 and United Airlines from $245 one-way.

  • 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 Region of Ontario?

    Currently, January is the cheapest month in which you can book a flight from Portland, Maine to Region of Ontario (average of $243). Flying from Portland, Maine to Region of Ontario in August is currently the most expensive (average of $348). 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

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Portland to Ontario

Discover the top airline 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$247Average$413FlexibilityNo cancel feeOn-time71%

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