HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$179+ 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 12/14. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — YYZ
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Portland to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$403
(Kiwi.com)

One-way from

$179
(Kiwi.com)

Popular in

October

Cheapest in

March

Average price

$746
Provider with most accurate pricing for Portland-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Toronto (YTO) flights.
Search Deals
From Portland to Ontario
Search Deals
One-way flight from Portland to Ontario
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($99 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 October 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/186:29 pmPWM - YYZ
1 stop20h 25mMultiple Airlines
Thu 11/205:15 pmYYZ - PWM
1 stop15h 51mMultiple Airlines
Deal found 10/28$403
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/257:35 pmPWM - YYZ
1 stop19h 19mMultiple Airlines
Tue 12/27:15 amYYZ - PWM
1 stop27h 21mMultiple Airlines
Deal found 10/28$419
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/129:46 amPWM - YYZ
1 stop10h 14mMultiple Airlines
Fri 12/197:10 amYYZ - PWM
1 stop27h 26mMultiple Airlines
Deal found 10/29$443
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/1411:58 amPWM - YYZ
1 stop26h 56mMultiple Airlines
Sun 12/218:00 pmYYZ - PWM
1 stop13h 06mMultiple Airlines
Deal found 10/30$449
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1011:16 amPWM - YYZ
1 stop12h 55mMultiple Airlines
Fri 12/197:10 amYYZ - PWM
1 stop27h 26mMultiple Airlines
Deal found 10/29$462
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/273:15 pmPWM - YYZ
2 stops30h 04mMultiple Airlines
Thu 12/45:15 pmYYZ - PWM
1 stop15h 51mMultiple Airlines
Deal found 10/28$471
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1911:16 amPWM - YUL
2 stops29h 09mMultiple Airlines
Sun 11/234:35 pmYUL - PWM
1 stop16h 31mMultiple Airlines
Deal found 10/29$492
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1511:16 amPWM - YUL
1 stop13h 14mMultiple Airlines
Mon 11/176:45 amYUL - PWM
2 stops35h 04mMultiple Airlines
Deal found 10/27$549
This Delta deal was found by Cheapflights users on 10/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/136:00 amPWM - YUL
1 stop7h 47mDelta
Sat 12/206:35 pmYUL - PWM
1 stop4h 15mDelta
Deal found 10/29$606
This American Airlines deal was found by Cheapflights users on 10/27. 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 11/155:21 pmPWM - YUL
2 stops29h 38mAmerican Airlines
Mon 11/177:30 amYUL - PWM
2 stops16h 29mAmerican Airlines
Deal found 10/27$608
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1311:16 amPWM - YUL
1 stop13h 14mMultiple Airlines
Sat 12/207:20 pmYUL - PWM
2 stops37h 46mMultiple Airlines
Deal found 10/29$615
This United Airlines deal was found by Cheapflights users on 10/29. 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.
Wed 11/197:22 pmPWM - YUL
2 stops12h 10mUnited Airlines
Sun 11/239:15 amYUL - PWM
2 stops14h 02mUnited Airlines
Deal found 10/29$631

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 October 30, 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 11/18

6:29 pm-2:54 pm

1 stop20h 25m

Toronto Pearson Intl

Thu 11/20

5:15 pm-9:06 am

1 stop15h 51m

$403

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Tue 11/25

7:35 pm-2:54 pm

1 stop19h 19m

Toronto Pearson Intl

Tue 12/2

7:15 am-10:36 am

1 stop27h 21m

$421

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Fri 12/12

9:46 am-8:00 pm

1 stop10h 14m

Toronto Pearson Intl

Fri 12/19

7:10 am-10:36 am

1 stop27h 26m

$443

PortlandMontreal

PWM - YUL

PWMYUL

Portland

Tue 1/27

6:00 am-1:22 pm

1 stop7h 22m

Montreal Pierre Elliott Trudeau Intl

Wed 1/28

2:15 pm-11:22 pm

1 stop9h 07m

$445

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Sat 1/10

5:30 am-4:35 pm

1 stop11h 05m

Toronto Pearson Intl

Sun 1/11

5:15 pm-12:06 pm

1 stop18h 51m

$447

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Wed 1/7

5:20 am-4:35 pm

1 stop11h 15m

Toronto Pearson Intl

Sat 1/10

5:15 pm-12:06 pm

1 stop18h 51m

$447

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Sun 12/14

11:58 am-2:54 pm

1 stop26h 56m

Toronto Pearson Intl

Sun 12/21

8:00 pm-9:06 am

1 stop13h 06m

$449

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Wed 12/10

11:16 am-12:11 am

1 stop12h 55m

Toronto Pearson Intl

Fri 12/19

7:10 am-10:36 am

1 stop27h 26m

$462

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Thu 11/27

3:15 pm-9:19 pm

2 stops30h 04m

Toronto Pearson Intl

Thu 12/4

5:15 pm-9:06 am

1 stop15h 51m

$471

PortlandMontreal

PWM - YUL

PWMYUL

Portland

Tue 1/13

4:10 pm-4:01 pm

1 stop23h 51m

Montreal Pierre Elliott Trudeau Intl

Sun 1/18

9:25 am-11:30 pm

2 stops14h 05m

$518

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 21 results
1
2
3

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, October is the cheapest month in which you can book a flight from Portland, Maine to Region of Ontario (average of $110). Flying from Portland, Maine to Region of Ontario in December is currently the most expensive (average of $160). 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 October 30, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 35% on flights from Portland, Maine to Region of Ontario by exploring options for tickets in the afternoon.

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 October 30, 2025.
Read reviews from past customers who have flown American Airlines from Portland to Ontario. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
11,034 reviews

Food

6.4

Boarding

7.5

Comfort

7.2

Overall

7.2

Entertainment

6.9

Crew

8.0

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac
American Airlines
7.2
Good
11,034 reviews
American Airlines
7.2
Good
11,034 reviews

Food

6.4

Boarding

7.5

Comfort

7.2

Overall

7.2

Entertainment

6.9

Crew

8.0

Reviews

1 / 20
2.0
Mediocre

Jeremy,Sep 2025

SAN - PHL

Terrible. Bad customer service and unacceptable delay on the tarmac

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.

  • How long is the flight from Portland, Maine to Region of Ontario?

    Departing from Portland, Maine to Region of Ontario will take you 7h 22m. The distance from Portland, Maine to Region of Ontario is about 211 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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, October is the cheapest month in which you can book a flight from Portland, Maine to Region of Ontario (average of $110). Flying from Portland, Maine to Region of Ontario in December is currently the most expensive (average of $160). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Portland to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Boston to Pearson Intl flights
Boston to Toronto Island flights
Boston to Pierre Elliott Trudeau Intl flights
Boston to Vancouver Intl flights
Boston to Calgary flights
Boston to Québec City flights
Boston to Abbotsford flights
Boston to Halifax flights
Boston to Ottawa flights
Boston to Kelowna flights
Boston to Winnipeg flights
Portland to Pearson Intl flights
Boston to Victoria flights
Boston to St. John's flights
Boston to Edmonton flights
Portland to Vancouver Intl flights
Portland to Pierre Elliott Trudeau Intl flights
Boston to Charlottetown flights
Boston to Regina flights
Boston to Windsor flights
Bangor to Pierre Elliott Trudeau Intl flights
Boston to Nanaimo flights
Boston to London flights
Portland to Calgary flights
Portland to Québec City flights
Boston to St John flights
Boston to Moncton flights
Boston to Deer Lake flights
Augusta to Halifax flights
Bangor to Vancouver Intl flights
Boston to Saskatoon flights
Portland to Halifax flights
Portland to St. John's flights
Bangor to Pearson Intl flights
Portland to Charlottetown flights
Boston to Thunder Bay flights
Boston to Cranbrook flights
Boston to Kamloops flights
Boston to Whitehorse flights
Boston to Comox flights
Rockland to Halifax flights
Rockland to St. John's flights
Portland to Sydney flights
Boston to Sydney flights
Boston to Gander flights
Boston to Red Deer flights
Bangor to St. John's flights
Boston to Happy Valley-Goose Bay flights
Boston to Prince George flights
Boston to Prince Rupert flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.