$182+ 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 7/2. Fares are subject to change and may not be available on all flights or dates of travel.
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 June 12, 2025.
Round-trip from | $372 (Delta) |
|---|---|
One-way from | $182 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $543 |
Find flight deals from Portland to Ontario
Cheapest flights from Portland to OntarioExplore 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 June 12, 2025.
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 June 12, 2025.
This Delta deal was found by Cheapflights users on 6/11. 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.
This Delta deal was found by Cheapflights users on 6/11. 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.
This American Airlines deal was found by Cheapflights users on 6/11. 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.
This American Airlines deal was found by Cheapflights users on 6/10. 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.
This Mytrip deal was found by Cheapflights users on 6/10. 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.
This United Airlines deal was found by Cheapflights users on 6/10. 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.
This United Airlines deal was found by Cheapflights users on 6/12. 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.
This United deal was found by Cheapflights users on 6/10. 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.
This Air Canada deal was found by Cheapflights users on 6/10. 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.
This Air Canada deal was found by Cheapflights users on 6/11. 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.
This WestJet deal was found by Cheapflights users on 6/10. 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.
This WestJet deal was found by Cheapflights users on 6/11. 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.
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 June 12, 2025.
Use the filters below to find and compare flights from Portland to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
PortlandMontreal
PWM - YUL
PWMYUL
Portland
Sat 8/16
7:00 am-8:04 pm
1 stop13h 04m
Montreal Pierre Elliott Trudeau Intl
Tue 8/19
6:00 am-11:25 pm
1 stop17h 25m
PortlandToronto
PWM - YYZ
PWMYYZ
Portland
Sat 8/16
7:00 am-4:10 pm
1 stop9h 10m
Toronto Pearson Intl
Wed 8/20
6:04 am-1:56 pm
1 stop7h 52m
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
PortlandToronto
PWM - YYZ
PWMYYZ
Portland
Fri 7/4
7:00 am-5:40 pm
1 stop10h 40m
Toronto Pearson Intl
Fri 7/11
7:15 am-8:24 pm
1 stop13h 09m
PortlandToronto
PWM - YYZ
PWMYYZ
Portland
Thu 7/3
1:10 pm-9:08 pm
2 stops31h 58m
Toronto Pearson Intl
Sat 7/12
6:30 am-8:12 pm
2 stops37h 42m
PortlandMontreal
PWM - YUL
PWMYUL
Portland
Tue 7/8
6:01 am-10:34 am
1 stop4h 33m
Montreal Pierre Elliott Trudeau Intl
Tue 7/15
3:30 pm-11:14 pm
1 stop7h 44m
PortlandToronto
PWM - YYZ
PWMYYZ
Portland
Thu 10/9
5:45 am-10:04 am
1 stop4h 19m
Toronto Pearson Intl
Sun 10/12
7:30 am-1:44 pm
1 stop6h 14m
PortlandMontreal
PWM - YUL
PWMYUL
Portland
Sat 8/16
6:00 am-5:00 pm
1 stop11h 00m
Montreal Pierre Elliott Trudeau Intl
Mon 8/18
8:00 am-6:26 pm
2 stops10h 26m
PortlandToronto
PWM - YYZ
PWMYYZ
Portland
Fri 7/4
7:28 am-5:29 pm
2 stops10h 01m
Toronto Pearson Intl
Fri 7/11
2:00 pm-11:14 pm
2 stops9h 14m
PortlandMontreal
PWM - YUL
PWMYUL
Portland
Sun 8/17
6:00 am-1:09 pm
1 stop7h 09m
Montreal Pierre Elliott Trudeau Intl
Sun 8/17
3:41 pm-11:58 pm
1 stop8h 17m
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.
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 $353). 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 June 12, 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 June 12, 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.
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Comfort
Entertainment
Overall
Food
Crew
Reviews
Kim,May 2025
PIH - SLC
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.
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.
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 June 12, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$247 | Average$417 | FlexibilityNo cancel fee | On-time71% |