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

American Airlines, at $317, was found to be the cheapest airline from Portland, Maine to Ontario.Alternate airlines to your destination round-trip include Delta and United Airlines. Users have found that American Airlines is 47% cheaper than the other options available to this destination.

What is the cheapest day to fly from Portland, Maine to Ontario?

Travelers seeking maximum savings on their Portland, Maine to Ontario flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

What is the cheapest day to fly round-trip from Portland, Maine to Ontario?

It’s generally more expensive to depart on a Friday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.

How far in advance should I book a flight from Portland, Maine to Ontario?

Travelers have found it’s best to book a flight 58 days in advance to save up to 120% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 58 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Portland, Maine to Ontario 1-2 weeks in advance for as low as $440, or $597 for flights within the next 24 hours.

What is the cheapest month to fly from Portland, Maine to Ontario?

The best pricing can be found in the month of January. Prices to Ontario from Portland, Maine average $473. You can even find prices in January for less than $473, as users have found deals to Ontario from as low as $236. The month of March appears to be one of the more expensive times to travel to Ontario from Portland, Maine. Flying in the targeted month can save you up to 22%.

What is the cheapest time of day to fly from PWM to ONT?

One of the essential ways to save on airfare from Portland, Maine to Ontario is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the afternoon could potentially save you up to 34% on airfare.

Most accurate provider : When it comes to deals on Portland, Maine-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland, Maine-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland, Maine-Ontario flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Portland, Maine-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland, Maine-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

$137+ Flights from Portland, ME to Ontario

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1. Tell us where you want to go

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Cheap flight deals from Portland to Ontario

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$317 (American Airlines)
One-way from	$137 (Trip.com)
Popular in	February
Cheapest in	September
Average price	$632

Provider with most accurate pricing for Portland-Ontario flight deals.

Search Deals

Provider most trusted by Cheapflights users for Portland-Ontario flights.

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From Portland to Ontario

Search Deals

One-way flight from Portland to Ontario

Search Deals

High demand for flights, 12% potential price rise

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Best time to find cheap flights, 5% potential price drop

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Average for round-trip flights in January 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 January 20, 2025.

Tue 4/812:09 pmPWM - ONT

2 stops13h 02mAmerican Airlines

Tue 4/156:00 amONT - PWM

2 stops12h 24mAmerican Airlines

Deal found 1/19

$317

Sat 2/225:34 amPWM - ONT

1 stop9h 21mDelta

Sat 3/11:05 pmONT - PWM

1 stop7h 50mDelta

Deal found 1/19

$449

Sun 2/237:20 pmPWM - ONT

2 stops28h 32mUnited Airlines

Sat 3/13:30 pmONT - PWM

2 stops16h 12mUnited Airlines

Deal found 1/19

$506

Fri 5/303:20 pmPWM - ONT

1 stop9h 02mJetBlue

Fri 6/610:40 pmONT - PWM

1 stop11h 40mJetBlue

Deal found 1/19

$525

Fri 5/304:10 pmPWM - ONT

3 stops20h 07mAlaska Airlines

Fri 6/64:43 pmONT - PWM

2 stops14h 03mAlaska Airlines

Deal found 1/19

$1,024

Best flights from Portland to Ontario
Discover carefully curated flight deals from Portland to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated January 20, 2025.

Tue 4/812:09 pmPWM - ONT

2 stops13h 02mAmerican Airlines

Tue 4/156:00 amONT - PWM

2 stops12h 24mAmerican Airlines

Deal found 1/19

$317

Sat 2/225:34 amPWM - ONT

1 stop9h 21mDelta

Sat 3/11:05 pmONT - PWM

1 stop7h 50mDelta

Deal found 1/19

$449

Sun 2/237:20 pmPWM - ONT

2 stops28h 32mUnited Airlines

Sat 3/13:30 pmONT - PWM

2 stops16h 12mUnited Airlines

Deal found 1/19

$506

Last-minute flights from Portland to Ontario
Discover last-minute flight deals from Portland to Ontario. Data last updated January 20, 2025 and is based on user searches.

Sat 2/225:34 amPWM - ONT

1 stop9h 21mDelta

Sat 3/11:05 pmONT - PWM

1 stop7h 50mDelta

Deal found 1/19

$449

Sun 2/237:20 pmPWM - ONT

2 stops28h 32mUnited Airlines

Sat 3/13:30 pmONT - PWM

2 stops16h 12mUnited Airlines

Deal found 1/19

$506

One-way flights from Portland to Ontario
Search for one-way flight options from Portland to Ontario. Find affordable one-way fares based on user searches. Data last updated January 20, 2025.

Mon 2/248:35 pmPWM - ONT

2 stops30h 24mFrontier

Deal found 1/19

$137

Thu 2/206:01 amPWM - ONT

2 stops11h 28mUnited Airlines

Deal found 1/20

$209

Find flights from Portland to Ontario within your budget

Fly from

Fly to

Route

Depart

Return

Price

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 4/8

12:09 pm-10:11 pm

2 stops13h 02m

Ontario

Tue 4/15

6:00 am-9:24 pm

2 stops12h 24m

$317

PortlandOntario

PWM - ONT

PWMONT

Portland

Sat 2/22

5:34 am-11:55 am

1 stop9h 21m

Ontario

Sat 3/1

1:05 pm-11:55 pm

1 stop7h 50m

$449

PortlandOntario

PWM - ONT

PWMONT

Portland

Sun 2/23

7:20 pm-8:52 pm

2 stops28h 32m

Ontario

Sat 3/1

3:30 pm-10:42 am

2 stops16h 12m

$506

PortlandOntario

PWM - ONT

PWMONT

Portland

Mon 2/24

8:35 pm-11:59 pm

2 stops30h 24m

$137

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 2/20

6:01 am-2:29 pm

2 stops11h 28m

$209

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/19

Compare providers for flights from Portland to Ontario

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Ontario in January.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Portland, Maine-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland, Maine-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland, Maine-Ontario flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Portland, Maine-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland, Maine-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

Travel insights for flights from Portland to Ontario

Get recent, data-driven insights about flights from Portland to Ontario including ideal travel times, pricing trends, and more.

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 $311). 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.

Rainfall in Ontario by month

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

Reviews of airlines servicing Ontario

Delta

8.0

Very good

8,521 reviews

Reviews

1 / 10

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

Delta

8.0

Very good

8,521 reviews

Delta

8.0

Very good

8,521 reviews

Reviews

1 / 10

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

United Airlines

7.4

Good

8,982 reviews

Delta

8.0

Very good

8,521 reviews

Reviews

1 / 10

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

8,521 reviews

Reviews

1 / 10

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

Frontier

6.1

Okay

3,440 reviews

Delta

8.0

Very good

8,521 reviews

Reviews

1 / 10

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

Related info for your journey

What are the cheapest airlines flying from Portland, Maine to Ontario round-trip?
American Airlines, at $317, was found to be the cheapest airline from Portland, Maine to Ontario.Alternate airlines to your destination round-trip include Delta and United Airlines. Users have found that American Airlines is 47% cheaper than the other options available to this destination.
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 $311). 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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Other flights to Ontario

Top airline flying from Portland to Ontario

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$352	Average$592	FlexibilityNo cancel fee	On-time71%

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$137+ 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 2/24. 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

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Portland to Ontario

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

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 January 20, 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 January 20, 2025.

Find flights from Portland to Ontario within your budget

Compare providers for flights from Portland to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Ontario in January.

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.

Travel insights for flights from Portland to Ontario

Get recent, data-driven insights about flights from Portland to Ontario including ideal travel times, pricing trends, and more.

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

Rainfall in Ontario by month

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

Temperature in Ontario by month

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

Reviews of airlines servicing Ontario

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

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

How can I find direct flights from Portland to Ontario?

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

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

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

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Travel Smart

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 January 20, 2025.