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$167+ 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 5/16. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — YYZ
May 5 — May 121
Mon 5/5
Mon 5/12
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 April 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$370
(Delta)

One-way from

$167
(United Airlines)

Popular in

April

Cheapest in

September

Average price

$542
Provider with most accurate pricing for Portland-Toronto (YTO) flight deals.
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Provider most trusted by Cheapflights users for Portland-Toronto (YTO) flights.
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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. 15% potential increase in price ($75 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 30, 2025.

This Delta deal was found by Cheapflights users on 4/28. 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.
Thu 6/51:40 pmPWM - YUL
1 stop7h 29mDelta
Sat 6/146:00 amYUL - PWM
1 stop8h 44mDelta
Deal found 4/28$370
This Mytrip deal was found by Cheapflights users on 4/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/52:35 pmPWM - YUL
3 stops29h 22mMultiple Airlines
Sat 6/146:45 amYUL - PWM
3 stops37h 27mMultiple Airlines
Deal found 4/28$389
This Delta deal was found by Cheapflights users on 4/29. 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.
Thu 5/295:30 pmPWM - YYZ
1 stop5h 24mDelta
Thu 6/56:15 pmYYZ - PWM
1 stop5h 59mDelta
Deal found 4/29$390
This American Airlines deal was found by Cheapflights users on 4/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/295:50 amPWM - YYZ
2 stops8h 43mAmerican Airlines
Thu 6/57:35 amYYZ - PWM
1 stop13h 20mAmerican Airlines
Deal found 4/29$400
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Sat 5/316:10 amPWM - YYZ
1 stop6h 36mUnited Airlines
Mon 6/212:05 pmYYZ - PWM
2 stops11h 22mUnited Airlines
Deal found 4/28$424
This American Airlines deal was found by Cheapflights users on 4/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/27:02 amPWM - YUL
1 stop9h 43mAmerican Airlines
Wed 7/910:30 amYUL - PWM
1 stop9h 54mAmerican Airlines
Deal found 4/28$425
This WestJet deal was found by Cheapflights users on 4/29. 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/135:00 pmPWM - YYZ
1 stop15h 58mWestJet
Fri 5/166:30 amYYZ - PWM
1 stop9h 33mWestJet
Deal found 4/29$465
This Priceline deal was found by Cheapflights users on 4/28. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/156:03 amPWM - YUL
1 stop4h 05mWestJet
Tue 7/15:00 pmYUL - PWM
1 stop6h 30mWestJet
Deal found 4/28$573
This Air Canada deal was found by Cheapflights users on 4/29. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/206:00 amPWM - YYZ
2 stops10h 54mAir Canada
Tue 5/274:00 pmYYZ - PWM
2 stops7h 27mAir Canada
Deal found 4/29$586
This United Airlines deal was found by Cheapflights users on 4/28. 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 6/54:43 pmPWM - YUL
1 stop24h 43mUnited Airlines
Sat 6/144:40 pmYUL - PWM
2 stops21h 51mUnited Airlines
Deal found 4/28$596
This Mytrip deal was found by Cheapflights users on 4/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/256:05 pmPWM - YYZ
2 stops20h 00mMultiple Airlines
Mon 7/2811:30 amYYZ - PWM
2 stops25h 35mMultiple Airlines
Deal found 4/29$621

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 April 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

PortlandMontreal

PWM - YUL

PWMYUL

Portland

Thu 6/5

1:40 pm-9:09 pm

1 stop7h 29m

Montreal Pierre Elliott Trudeau Intl

Sat 6/14

6:00 am-2:44 pm

1 stop8h 44m

$370

PortlandMontreal

PWM - YUL

PWMYUL

Portland

Thu 6/5

2:35 pm-7:57 pm

3 stops29h 22m

Montreal Pierre Elliott Trudeau Intl

Sat 6/14

6:45 am-8:12 pm

3 stops37h 27m

$389

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Thu 5/29

5:30 pm-10:54 pm

1 stop5h 24m

Toronto Pearson Intl

Thu 6/5

6:15 pm-12:14 am

1 stop5h 59m

$390

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Thu 5/29

5:50 am-2:33 pm

2 stops8h 43m

Toronto Pearson Intl

Thu 6/5

7:35 am-8:55 pm

1 stop13h 20m

$400

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Sat 5/31

6:10 am-12:46 pm

1 stop6h 36m

Toronto Pearson Intl

Mon 6/2

12:05 pm-11:27 pm

2 stops11h 22m

$424

PortlandMontreal

PWM - YUL

PWMYUL

Portland

Wed 7/2

7:02 am-4:45 pm

1 stop9h 43m

Montreal Pierre Elliott Trudeau Intl

Wed 7/9

10:30 am-8:24 pm

1 stop9h 54m

$425

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Tue 5/13

5:00 pm-8:58 am

1 stop15h 58m

Toronto Pearson Intl

Fri 5/16

6:30 am-4:03 pm

1 stop9h 33m

$465

PortlandMontreal

PWM - YUL

PWMYUL

Portland

Sun 6/15

6:03 am-10:08 am

1 stop4h 05m

Montreal Pierre Elliott Trudeau Intl

Tue 7/1

5:00 pm-11:30 pm

1 stop6h 30m

$573

PortlandToronto

PWM - YYZ

PWMYYZ

Portland

Tue 5/20

6:00 am-4:54 pm

2 stops10h 54m

Toronto Pearson Intl

Tue 5/27

4:00 pm-11:27 pm

2 stops7h 27m

$586

PortlandMontreal

PWM - YUL

PWMYUL

Portland

Thu 6/5

4:43 pm-5:26 pm

1 stop24h 43m

Montreal Pierre Elliott Trudeau Intl

Sat 6/14

4:40 pm-2:31 pm

2 stops21h 51m

$596

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 19 results
1
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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 July is currently the most expensive (average of $359). 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 April 30, 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Region of Ontario ranges from 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

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 April 30, 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
7,936 reviews

Crew

8.5

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,936 reviews
Delta
8.0
Very good
7,936 reviews

Crew

8.5

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,696 reviews
Delta
8.0
Very good
7,936 reviews

Crew

8.5

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,936 reviews

Crew

8.5

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
WestJet
7.2
Good
2,823 reviews
Delta
8.0
Very good
7,936 reviews

Crew

8.5

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air Canada
7.0
Good
9,242 reviews
Delta
8.0
Very good
7,936 reviews

Crew

8.5

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 $167 on United Airlines. Other airlines that offer cheap prices include American Airlines from $194 and WestJet from $304 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 July is currently the most expensive (average of $359). 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 April 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$247Average$379FlexibilityNo cancel feeOn-time71%

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