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

Airlines like JetBlue, United Airlines, and Southwest fly from Portland, Maine to Ontario in about 10h 51m. The time it takes to get you to your destination can typically vary by up to 6h 27m. 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.

$180+ Flights from Portland, ME to Ontario

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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

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 15, 2025.

Thu 12/1811:50 amPWM - ONT

1 stop8h 25mSouthwest

Sat 12/209:30 amONT - PWM

2 stops11h 50mSouthwest

Deal found 12/14

$806

Mon 12/295:45 amPWM - ONT

2 stops11h 07mAmerican Airlines

Fri 1/26:20 amONT - PWM

2 stops13h 35mAmerican Airlines

Deal found 12/14

$1,099

Thu 12/1810:19 amPWM - ONT

2 stops13h 48mUnited Airlines

Sat 12/201:40 pmONT - PWM

3 stops17h 04mUnited Airlines

Deal found 12/14

$1,210

Wed 12/172:34 pmPWM - ONT

2 stops12h 24mDelta

Mon 1/1210:30 pmONT - PWM

2 stops12h 15mDelta

Deal found 12/14

$1,628

Wed 12/177:02 amPWM - ONT

2 stops14h 17mAmerican Airlines

Mon 1/126:27 amONT - PWM

2 stops13h 27mAmerican Airlines

Deal found 12/13

$1,675

Mon 12/294:10 pmPWM - ONT

1 stop9h 15mUnited Airlines

Fri 1/211:59 pmONT - PWM

1 stop11h 15mUnited Airlines

Deal found 12/14

$2,557

Tue 12/304:10 pmPWM - ONT

1 stop9h 15mUnited Airlines

Thu 1/156:39 pmONT - PWM

2 stops11h 22mUnited Airlines

Deal found 12/13

$2,655

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 15, 2025.

Sun 1/188:35 amPWM - ONT

2 stops17h 18mUnited Airlines

Wed 1/216:00 amONT - PWM

2 stops14h 30mUnited Airlines

Deal found 12/14

$384

Tue 1/65:45 amPWM - ONT

2 stops12h 00mSouthwest

Thu 1/159:45 amONT - PWM

2 stops10h 00mSouthwest

Deal found 12/14

$399

Fri 5/12:18 pmPWM - ONT

1 stop10h 51mJetBlue

Sun 5/1711:25 pmONT - PWM

1 stop10h 58mJetBlue

Deal found 12/14

$428

Tue 1/65:30 amPWM - ONT

1 stop9h 01mDelta

Thu 1/1510:30 pmONT - PWM

2 stops10h 38mDelta

Deal found 12/14

$793

Tue 2/311:12 amPWM - ONT

2 stops12h 46mUnited Airlines

Sat 2/75:05 amONT - PWM

2 stops10h 49mUnited Airlines

Deal found 12/12

$519

Thu 1/15:30 amPWM - ONT

2 stops12h 20mSouthwest

Fri 1/210:10 amONT - PWM

2 stops10h 55mSouthwest

Deal found 12/13

$733

Wed 4/154:23 pmPWM - ONT

1 stop9h 03mUnited Airlines

Mon 4/206:00 amONT - PWM

2 stops13h 58mUnited Airlines

Deal found 12/14

$668

Sat 4/1812:30 pmPWM - ONT

1 stop8h 45mDelta

Sat 4/255:55 pmONT - PWM

2 stops15h 00mDelta

Deal found 12/13

$824

Sat 4/114:23 pmPWM - ONT

1 stop9h 03mUnited Airlines

Sat 4/186:00 amONT - PWM

2 stops13h 58mUnited Airlines

Deal found 12/14

$717

Last-minute flights from Portland to Ontario
Discover last-minute flight deals from Portland to Ontario. Data last updated December 15, 2025 and is based on user searches.

Thu 12/1811:50 amPWM - ONT

1 stop8h 25mSouthwest

Sat 12/209:30 amONT - PWM

2 stops11h 50mSouthwest

Deal found 12/14

$806

Thu 12/1810:19 amPWM - ONT

2 stops13h 48mUnited Airlines

Sat 12/201:40 pmONT - PWM

3 stops17h 04mUnited Airlines

Deal found 12/14

$1,210

Mon 12/295:45 amPWM - ONT

2 stops11h 07mAmerican Airlines

Fri 1/26:20 amONT - PWM

2 stops13h 35mAmerican Airlines

Deal found 12/14

$1,099

Thu 1/15:30 amPWM - ONT

2 stops12h 20mSouthwest

Fri 1/210:10 amONT - PWM

2 stops10h 55mSouthwest

Deal found 12/13

$733

Tue 1/65:45 amPWM - ONT

2 stops12h 00mSouthwest

Thu 1/159:45 amONT - PWM

2 stops10h 00mSouthwest

Deal found 12/14

$399

Tue 1/65:30 amPWM - ONT

1 stop9h 01mDelta

Thu 1/1510:30 pmONT - PWM

2 stops10h 38mDelta

Deal found 12/14

$793

Tue 1/69:40 amPWM - ONT

3 stops14h 18mUnited Airlines

Thu 1/155:05 amONT - PWM

2 stops10h 45mUnited Airlines

Deal found 12/14

$857

Sun 1/188:35 amPWM - ONT

2 stops17h 18mUnited Airlines

Wed 1/216:00 amONT - PWM

2 stops14h 30mUnited Airlines

Deal found 12/14

$384

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 15, 2025.

Thu 1/85:30 amPWM - ONT

1 stop9h 01mDelta

Deal found 12/14

$180

Sat 1/178:40 amPWM - ONT

2 stops17h 13mUnited Airlines

Deal found 12/15

$181

Tue 2/246:00 amPWM - ONT

3 stops14h 41mUnited Airlines

Deal found 12/15

$186

Tue 3/104:23 pmPWM - ONT

1 stop9h 02mUnited Airlines

Deal found 12/15

$199

Fri 1/98:40 amPWM - ONT

2 stops15h 18mUnited Airlines

Deal found 12/15

$204

Thu 2/266:00 amPWM - ONT

3 stops14h 41mUnited Airlines

Deal found 12/15

$209

Fri 1/95:30 amPWM - ONT

1 stop9h 01mDelta

Deal found 12/14

$210

Sat 1/108:40 amPWM - ONT

2 stops15h 18mUnited Airlines

Deal found 12/15

$235

Sat 2/216:00 amPWM - ONT

3 stops14h 41mUnited Airlines

Deal found 12/15

$240

Thu 1/88:40 amPWM - ONT

2 stops15h 18mUnited Airlines

Deal found 12/14

$252

Mon 2/236:00 amPWM - ONT

3 stops14h 41mUnited Airlines

Deal found 12/13

$257

Mon 1/54:10 pmPWM - ONT

1 stop9h 15mUnited Airlines

Deal found 12/15

$260

Find flight deals from Portland to Ontario

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$366 (Priceline)
One-way from	$180 (Delta)
Popular in	December
Cheapest in	September
Average price	$437

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. 2% potential increase in price ($8 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($8 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

Sun 1/18

8:35 am-10:53 pm

2 stops17h 18m

Ontario

Wed 1/21

6:00 am-11:30 pm

2 stops14h 30m

$384

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 1/6

5:45 am-2:45 pm

2 stops12h 00m

Ontario

Thu 1/15

9:45 am-10:45 pm

2 stops10h 00m

$399

PortlandOntario

PWM - ONT

PWMONT

Portland

Fri 5/1

2:18 pm-10:09 pm

1 stop10h 51m

Ontario

Sun 5/17

11:25 pm-1:23 pm

1 stop10h 58m

$428

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 2/3

11:12 am-8:58 pm

2 stops12h 46m

Ontario

Sat 2/7

5:05 am-6:54 pm

2 stops10h 49m

$519

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 4/15

4:23 pm-10:26 pm

1 stop9h 03m

Ontario

Mon 4/20

6:00 am-10:58 pm

2 stops13h 58m

$668

PortlandOntario

PWM - ONT

PWMONT

Portland

Sat 4/11

4:23 pm-10:26 pm

1 stop9h 03m

Ontario

Sat 4/18

6:00 am-10:58 pm

2 stops13h 58m

$717

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 1/1

5:30 am-2:50 pm

2 stops12h 20m

Ontario

Fri 1/2

10:10 am-12:05 am

2 stops10h 55m

$733

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 1/6

5:30 am-11:31 am

1 stop9h 01m

Ontario

Thu 1/15

10:30 pm-12:08 pm

2 stops10h 38m

$793

PortlandOntario

PWM - ONT

PWMONT

Portland

Sat 4/18

12:30 pm-6:15 pm

1 stop8h 45m

Ontario

Sat 4/25

5:55 pm-11:55 am

2 stops15h 00m

$824

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 1/27

6:00 am-5:43 pm

2 stops14h 43m

$181

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Showing 1-10 of 18 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

8,007 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

8,007 reviews

Delta

7.9

Good

8,007 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

11,052 reviews

Delta

7.9

Good

8,007 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 JetBlue, United Airlines, and Southwest fly from Portland, Maine to Ontario in about 10h 51m. The time it takes to get you to your destination can typically vary by up to 6h 27m. 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

Alternative routes for Portland to Ontario

Boston to Los Angeles flights

Boston to Las Vegas flights

Boston to San Francisco flights

Boston to San Diego flights

Boston to Ontario flights

Boston to Santa Ana flights

Boston to Palm Springs flights

Boston to Reno flights

Boston to San Jose flights

Boston to Sacramento flights

Boston to Burbank flights

Portland to Las Vegas flights

Portland to San Francisco flights

Boston to Oakland flights

Boston to Santa Barbara flights

Portland to Los Angeles flights

Boston to San Luis Obispo flights

Portland to Oakland flights

Boston to Long Beach flights

Bangor to Las Vegas flights

Augusta to San Francisco flights

Boston to Monterey flights

Portland to Sacramento flights

Portland to San Diego flights

Boston to Fresno flights

Bangor to Los Angeles flights

Boston to Medford flights

Portland to Palm Springs flights

Boston to Santa Rosa flights

Bangor to San Diego flights

Portland to Reno flights

Bangor to San Francisco flights

Portland to Santa Ana flights

Rockland to San Francisco flights

Boston to Redding flights

Boston to Arcata flights

Portland to Santa Barbara flights

Augusta to San Diego flights

Portland to Fresno flights

Portland to Burbank flights

Bangor to Sacramento flights

Portland to San Jose flights

Portland to Medford flights

Augusta to Los Angeles flights

Boston to Yuma flights

Bangor to Santa Ana flights

Bangor to Ontario flights

Bar Harbor to Los Angeles flights

Bangor to Burbank flights

Complete your trip

Ontario car rentals

Los Angeles Airport car rentals

Ontario Airport car rentals

Burbank Bob Hope Airport car rentals

Long Beach Municipal Airport car rentals

Los Angeles car rentals

San Diego car rentals

San Francisco car rentals

San Jose car rentals

Fresno car rentals

Sacramento car rentals

Burbank car rentals

Other flights to Ontario

Top 2 airlines flying from Portland to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$259	Average$442	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$279	Average$513	FlexibilityNo cancel fee	On-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$180+ 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 1/8. 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

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 15, 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 15, 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

100% Free

Book with Flexibility

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 December 15, 2025.