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

Airlines like American Airlines, Delta, and United Airlines fly from Portland, Maine to Ontario in about 8h 41m. The time it takes to get you to your destination can typically vary by up to 4h 51m. There are 2590 mi between Portland, Maine and Ontario. Both multi-stop and nonstop flights can be found to your destination and back.

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

Delta, at $196, was found to be the cheapest airline from Portland, Maine to Ontario. An alternate airline flying to your destination would be American Airlines.

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

The cheapest airlines for a one-way flight from Portland, Maine to Ontario are United Airlines ($118), Delta ($148), and Southwest ($180).

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.

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).

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

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

Most accurate provider : When it comes to deals on Portland, Maine-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Portland, Maine-Ontario flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

$131+ Flights from Portland, ME to Ontario

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Cheap 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 December 26, 2025.

Tue 12/304:48 pmPWM - ONT

2 stops10h 06mDelta

Mon 1/512:41 pmONT - PWM

1 stop7h 13mDelta

Deal found 12/25

$693

Tue 12/304:48 pmPWM - ONT

2 stops10h 06mDelta

Thu 1/111:15 amONT - PWM

1 stop8h 28mDelta

Deal found 12/25

$745

Sat 12/274:10 pmPWM - ONT

1 stop9h 15mUnited Airlines

Tue 12/305:05 amONT - PWM

2 stops10h 06mUnited Airlines

Deal found 12/25

$942

Tue 12/304:48 pmPWM - ONT

2 stops10h 06mDelta

Sun 1/411:05 amONT - PWM

1 stop8h 38mDelta

Deal found 12/25

$965

Thu 12/254:10 pmPWM - ONT

1 stop9h 15mUnited Airlines

Sun 12/285:05 amONT - PWM

2 stops10h 21mUnited Airlines

Deal found 12/24

$1,007

Sat 12/274:10 pmPWM - ONT

1 stop9h 15mUnited Airlines

Fri 1/26:10 amONT - PWM

2 stops14h 12mUnited Airlines

Deal found 12/25

$1,055

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 December 26, 2025.

Wed 2/2512:17 pmPWM - ONT

2 stops13h 32mAmerican Airlines

Wed 3/46:13 amONT - PWM

2 stops13h 03mAmerican Airlines

Deal found 12/25

$261

Wed 2/255:31 amPWM - ONT

1 stop9h 31mDelta

Wed 3/410:20 pmONT - PWM

2 stops9h 58mDelta

Deal found 12/25

$333

Tue 5/54:45 pmPWM - ONT

1 stop8h 41mUnited Airlines

Sat 5/95:05 amONT - PWM

1 stop7h 30mUnited Airlines

Deal found 12/24

$397

Sat 1/178:40 amPWM - ONT

2 stops15h 18mUnited Airlines

Wed 1/216:00 amONT - PWM

2 stops14h 30mUnited Airlines

Deal found 12/24

$415

Wed 2/256:00 amPWM - ONT

3 stops14h 41mUnited Airlines

Wed 3/46:37 pmONT - PWM

2 stops13h 12mUnited Airlines

Deal found 12/25

$524

Sat 4/181:15 pmPWM - ONT

2 stops11h 21mAmerican Airlines

Sat 4/258:05 pmONT - PWM

2 stops12h 55mAmerican Airlines

Deal found 12/24

$897

Last-minute flights from Portland to Ontario
Discover last-minute flight deals from Portland to Ontario. Data last updated December 26, 2025 and is based on user searches.

Thu 12/254:10 pmPWM - ONT

1 stop9h 15mUnited Airlines

Sun 12/285:05 amONT - PWM

2 stops10h 21mUnited Airlines

Deal found 12/24

$1,007

Sat 12/274:10 pmPWM - ONT

1 stop9h 15mUnited Airlines

Tue 12/305:05 amONT - PWM

2 stops10h 06mUnited Airlines

Deal found 12/25

$942

Sat 12/274:10 pmPWM - ONT

1 stop9h 15mUnited Airlines

Fri 1/26:10 amONT - PWM

2 stops14h 12mUnited Airlines

Deal found 12/25

$1,055

Tue 12/304:48 pmPWM - ONT

2 stops10h 06mDelta

Mon 1/512:41 pmONT - PWM

1 stop7h 13mDelta

Deal found 12/25

$693

Tue 12/304:48 pmPWM - ONT

2 stops10h 06mDelta

Thu 1/111:15 amONT - PWM

1 stop8h 28mDelta

Deal found 12/25

$745

Tue 12/304:48 pmPWM - ONT

2 stops10h 06mDelta

Sun 1/411:05 amONT - PWM

1 stop8h 38mDelta

Deal found 12/25

$965

Sat 1/178:40 amPWM - ONT

2 stops15h 18mUnited Airlines

Wed 1/216:00 amONT - PWM

2 stops14h 30mUnited Airlines

Deal found 12/24

$415

Wed 1/2111:12 amPWM - ONT

2 stops12h 46mUnited Airlines

Wed 4/17:00 amONT - PWM

1 stop11h 40mUnited Airlines

Deal found 12/25

$1,265

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 December 26, 2025.

Sat 2/75:30 amPWM - ONT

2 stops16h 15mAmerican Airlines

Deal found 12/24

$131

Sat 2/75:30 amPWM - ONT

1 stop9h 01mDelta

Deal found 12/24

$149

Tue 4/214:45 pmPWM - ONT

2 stops9h 59mDelta

Deal found 12/25

$154

Wed 1/216:00 amPWM - ONT

2 stops14h 43mUnited Airlines

Deal found 12/26

$181

Tue 2/246:00 amPWM - ONT

3 stops14h 41mUnited Airlines

Deal found 12/26

$186

Tue 3/104:23 pmPWM - ONT

1 stop9h 02mUnited Airlines

Deal found 12/26

$199

Thu 1/228:40 amPWM - ONT

2 stops17h 13mUnited Airlines

Deal found 12/26

$204

Thu 2/266:00 amPWM - ONT

3 stops14h 41mUnited Airlines

Deal found 12/26

$209

Fri 6/51:35 pmPWM - ONT

1 stop11h 34mDelta

Deal found 12/25

$210

Sat 2/76:18 pmPWM - ONT

3 stops44h 52mMultiple Airlines

Deal found 12/24

$224

Sat 1/248:40 amPWM - ONT

2 stops15h 18mUnited Airlines

Deal found 12/26

$235

Find flight deals from Portland to Ontario

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$261 (American Airlines)
One-way from	$131 (American Airlines)
Popular in	December
Cheapest in	September
Average price	$578

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

Search Deals

Provider most trusted by Cheapflights users for Portland-Ontario 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. 7% potential increase in price ($34 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 2/25

12:17 pm-10:49 pm

2 stops13h 32m

Ontario

Wed 3/4

6:13 am-10:16 pm

2 stops13h 03m

$261

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 2/25

5:31 am-12:02 pm

1 stop9h 31m

Ontario

Wed 3/4

10:20 pm-11:18 am

2 stops9h 58m

$333

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 5/5

4:45 pm-10:26 pm

1 stop8h 41m

Ontario

Sat 5/9

5:05 am-3:35 pm

1 stop7h 30m

$397

PortlandOntario

PWM - ONT

PWMONT

Portland

Sat 1/17

8:40 am-8:58 pm

2 stops15h 18m

Ontario

Wed 1/21

6:00 am-11:30 pm

2 stops14h 30m

$415

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 2/25

6:00 am-5:41 pm

3 stops14h 41m

Ontario

Wed 3/4

6:37 pm-10:49 am

2 stops13h 12m

$524

PortlandOntario

PWM - ONT

PWMONT

Portland

Sat 4/18

1:15 pm-9:36 pm

2 stops11h 21m

Ontario

Sat 4/25

8:05 pm-12:00 pm

2 stops12h 55m

$897

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 4/21

4:45 pm-11:44 pm

2 stops9h 59m

$154

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 1/20

11:12 am-10:53 pm

2 stops14h 41m

$181

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 1/21

9:40 am-8:58 pm

2 stops14h 18m

$181

PortlandOntario

PWM - ONT

PWMONT

Portland

Sat 1/17

8:40 am-8:58 pm

2 stops15h 18m

$181

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/25

Showing 1-10 of 17 results

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 December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Portland, Maine-Ontario flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

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 Ontario?

Currently, August is the cheapest month in which you can book a flight from Portland, Maine to Ontario (average of $115). Flying from Portland, Maine to Ontario in December is currently the most expensive (average of $179). 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.

Reviews of airlines servicing Ontario

Read reviews from past customers who have flown Delta and American Airlines from Portland to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

7.9

Good

8,013 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

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

Delta

7.9

Good

8,013 reviews

Delta

7.9

Good

8,013 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

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

American Airlines

7.2

Good

11,062 reviews

Delta

7.9

Good

8,013 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

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

Related info for your journey

How long is the flight from Portland, Maine to Ontario?
Airlines like American Airlines, Delta, and United Airlines fly from Portland, Maine to Ontario in about 8h 41m. The time it takes to get you to your destination can typically vary by up to 4h 51m. There are 2590 mi between Portland, Maine and Ontario. Both multi-stop and nonstop flights can be found to your destination and back.
What are the cheapest airlines flying from Portland, Maine to Ontario round-trip?
Delta, at $196, was found to be the cheapest airline from Portland, Maine to Ontario. An alternate airline flying to your destination would be American Airlines.
What are the cheapest airlines to fly from Portland, Maine to Ontario one-way?
The cheapest airlines for a one-way flight from Portland, Maine to Ontario are United Airlines ($118), Delta ($148), and Southwest ($180).
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 $115). Flying from Portland, Maine to Ontario in December is currently the most expensive (average of $179). 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

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Other flights to Ontario

Top 2 airlines flying from Portland to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$259	Average$423	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$279	Average$513	FlexibilityNo cancel fee	On-time71%

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$131+ 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 2/7. 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

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Cheap 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 December 26, 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 December 26, 2025.

Find flight deals from Portland to Ontario

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from Portland to Ontario that are best for you.

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 December.

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 Ontario?

Reviews of airlines servicing Ontario

Read reviews from past customers who have flown Delta and American Airlines from Portland to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

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.

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

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

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

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 2 airlines flying from Portland to Ontario

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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 December 26, 2025.