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

Airlines like United Airlines, Delta, and American Airlines fly from Portland, Maine to Ontario in about 9h 24m. The time it takes to get you to your destination can typically vary by up to 7h 49m. 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?

American Airlines, at $279, was found to be the cheapest airline from Portland, Maine to Ontario. An alternate airline flying to your destination would be Delta. Users have found that American Airlines is 49% cheaper than the other options available to this destination.

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.

$181+ 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	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$284 (American Airlines)
One-way from	$181 (United Airlines)
Popular in	February
Cheapest in	May
Average price	$460

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. 12% potential increase in price ($78 potential increase over avg. RT price).

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Cheapest flight prices on average. 7% potential price decrease ($36 potential savings vs. average RT price).

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Average for round-trip flights in November 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 November 12, 2025.

Sat 12/137:11 amPWM - ONT

2 stops14h 08mAmerican Airlines

Mon 1/57:18 pmONT - PWM

2 stops13h 48mAmerican Airlines

Deal found 11/10

$369

Sat 12/1312:40 pmPWM - ONT

1 stop8h 55mSouthwest

Mon 1/510:50 amONT - PWM

1 stop10h 30mSouthwest

Deal found 11/10

$381

Sat 12/1310:15 amPWM - ONT

3 stops15h 34mUnited Airlines

Mon 1/511:59 pmONT - PWM

2 stops10h 57mUnited Airlines

Deal found 11/10

$521

Tue 11/253:20 pmPWM - ONT

1 stop8h 24mUnited Airlines

Tue 12/21:34 pmONT - PWM

2 stops16h 36mUnited Airlines

Deal found 11/10

$679

Tue 11/2512:26 pmPWM - ONT

2 stops12h 33mAmerican Airlines

Sat 11/2910:34 pmONT - PWM

1 stop8h 03mAmerican Airlines

Deal found 11/10

$733

Sun 11/165:00 pmPWM - ONT

1 stop8h 31mUnited Airlines

Wed 11/195:05 amONT - PWM

2 stops9h 43mUnited Airlines

Deal found 11/10

$793

Tue 11/117:02 amPWM - ONT

1 stop15h 39mAmerican Airlines

Sat 11/1510:34 pmONT - PWM

1 stop20h 59mAmerican Airlines

Deal found 11/10

$833

Wed 11/121:25 pmPWM - ONT

1 stop9h 17mDelta

Sun 11/165:49 pmONT - PWM

2 stops15h 19mDelta

Deal found 11/10

$874

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 November 12, 2025.

Sat 1/248:40 amPWM - ONT

2 stops17h 13mUnited Airlines

Tue 1/275:05 amONT - PWM

2 stops10h 45mUnited Airlines

Deal found 11/11

$361

Tue 1/65:30 amPWM - ONT

1 stop9h 24mDelta

Sun 1/1110:30 pmONT - PWM

2 stops9h 50mDelta

Deal found 11/9

$363

Sat 12/137:11 amPWM - ONT

2 stops14h 08mAmerican Airlines

Mon 1/57:18 pmONT - PWM

2 stops13h 48mAmerican Airlines

Deal found 11/10

$369

Thu 1/15:30 amPWM - ONT

2 stops12h 20mSouthwest

Tue 1/67:00 amONT - PWM

2 stops12h 15mSouthwest

Deal found 11/11

$416

Sat 12/1310:15 amPWM - ONT

3 stops15h 34mUnited Airlines

Mon 1/511:59 pmONT - PWM

2 stops10h 57mUnited Airlines

Deal found 11/10

$521

Tue 1/63:12 pmPWM - ONT

3 stops23h 06mUnited Airlines

Sun 1/116:39 pmONT - PWM

2 stops11h 22mUnited Airlines

Deal found 11/9

$576

Thu 1/17:17 amPWM - ONT

1 stop16h 41mAmerican Airlines

Tue 1/66:22 amONT - PWM

2 stops13h 32mAmerican Airlines

Deal found 11/11

$685

Tue 11/253:20 pmPWM - ONT

1 stop8h 24mUnited Airlines

Tue 12/21:34 pmONT - PWM

2 stops16h 36mUnited Airlines

Deal found 11/10

$679

Thu 1/15:30 amPWM - ONT

2 stops19h 55mUnited Airlines

Tue 1/65:05 amONT - PWM

3 stops30h 26mUnited Airlines

Deal found 11/11

$745

Last-minute flights from Portland to Ontario
Discover last-minute flight deals from Portland to Ontario. Data last updated November 12, 2025 and is based on user searches.

Sat 11/154:57 pmPWM - ONT

1 stop8h 34mUnited Airlines

Mon 11/175:05 amONT - PWM

2 stops9h 43mUnited Airlines

Deal found 11/11

$906

Tue 11/253:20 pmPWM - ONT

1 stop8h 24mUnited Airlines

Tue 12/21:34 pmONT - PWM

2 stops16h 36mUnited Airlines

Deal found 11/11

$679

Wed 11/263:20 pmPWM - ONT

1 stop8h 24mUnited Airlines

Sun 11/309:35 pmONT - PWM

1 stop15h 13mUnited Airlines

Deal found 11/10

$897

Wed 11/2612:26 pmPWM - ONT

2 stops12h 57mAmerican Airlines

Sun 11/307:30 pmONT - PWM

2 stops13h 16mAmerican Airlines

Deal found 11/11

$990

Thu 11/279:45 amPWM - ONT

1 stop8h 36mUnited Airlines

Mon 12/15:05 amONT - PWM

1 stop7h 43mUnited Airlines

Deal found 11/12

$887

Wed 12/175:46 amPWM - ONT

2 stops11h 09mAmerican Airlines

Mon 1/126:27 amONT - PWM

2 stops13h 27mAmerican Airlines

Deal found 11/12

$1,319

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 November 12, 2025.

Wed 1/1411:00 amPWM - ONT

2 stops12h 58mUnited Airlines

Deal found 11/11

$181

Tue 2/246:00 amPWM - ONT

3 stops14h 41mUnited Airlines

Deal found 11/12

$186

Wed 3/114:25 pmPWM - ONT

1 stop8h 50mUnited Airlines

Deal found 11/12

$199

Thu 1/88:40 amPWM - ONT

2 stops15h 18mUnited Airlines

Deal found 11/12

$204

Mon 2/236:00 amPWM - ONT

3 stops14h 41mUnited Airlines

Deal found 11/12

$209

Sat 1/178:40 amPWM - ONT

2 stops17h 13mUnited Airlines

Deal found 11/12

$235

Tue 12/166:00 amPWM - ONT

3 stops19h 49mUnited Airlines

Deal found 11/12

$240

Mon 1/128:40 amPWM - ONT

2 stops15h 18mUnited Airlines

Deal found 11/12

$252

Wed 2/255:45 amPWM - ONT

2 stops20h 12mUnited Airlines

Deal found 11/12

$276

Sat 2/216:00 amPWM - ONT

2 stops14h 41mUnited Airlines

Deal found 11/12

$284

Thu 1/158:40 amPWM - ONT

2 stops17h 13mUnited Airlines

Deal found 11/12

$285

Fly from

Fly to

Route

Depart

Return

Price

PortlandOntario

PWM - ONT

PWMONT

Portland

Sat 1/24

8:40 am-10:53 pm

2 stops17h 13m

Ontario

Tue 1/27

5:05 am-6:50 pm

2 stops10h 45m

$361

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 1/6

5:30 am-11:54 am

1 stop9h 24m

Ontario

Sun 1/11

10:30 pm-11:20 am

2 stops9h 50m

$363

PortlandOntario

PWM - ONT

PWMONT

Portland

Sat 12/13

7:11 am-6:19 pm

2 stops14h 08m

Ontario

Mon 1/5

7:18 pm-12:06 pm

2 stops13h 48m

$369

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 1/1

5:30 am-2:50 pm

2 stops12h 20m

Ontario

Tue 1/6

7:00 am-10:15 pm

2 stops12h 15m

$416

PortlandOntario

PWM - ONT

PWMONT

Portland

Sat 12/13

10:15 am-10:49 pm

3 stops15h 34m

Ontario

Mon 1/5

11:59 pm-1:56 pm

2 stops10h 57m

$521

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 1/6

3:12 pm-11:18 am

3 stops23h 06m

Ontario

Sun 1/11

6:39 pm-9:01 am

2 stops11h 22m

$576

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 11/25

3:20 pm-8:44 pm

1 stop8h 24m

Ontario

Tue 12/2

1:34 pm-9:10 am

2 stops16h 36m

$679

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 1/1

7:17 am-8:58 pm

1 stop16h 41m

Ontario

Tue 1/6

6:22 am-10:54 pm

2 stops13h 32m

$685

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 1/1

5:30 am-10:25 pm

2 stops19h 55m

Ontario

Tue 1/6

5:05 am-2:31 pm

3 stops30h 26m

$745

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 1/27

11:00 am-10:53 pm

2 stops14h 53m

$181

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 20 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 November.

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 April is currently the most expensive (average of $173). 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

8,009 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

8,009 reviews

Delta

7.9

Good

8,009 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

11,050 reviews

Delta

7.9

Good

8,009 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 United Airlines, Delta, and American Airlines fly from Portland, Maine to Ontario in about 9h 24m. The time it takes to get you to your destination can typically vary by up to 7h 49m. 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?
American Airlines, at $279, was found to be the cheapest airline from Portland, Maine to Ontario. An alternate airline flying to your destination would be Delta. Users have found that American Airlines is 49% 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 $115). Flying from Portland, Maine to Ontario in April is currently the most expensive (average of $173). 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
American Airlines	Cheapest$279	Average$593	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$302	Average$442	FlexibilityNo cancel fee	On-timeN/A

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$181+ 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 1/14. 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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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 November 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 November 12, 2025.

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 November.

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?

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 November 12, 2025.