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Ontario

$188+ Cheap flights from Portland, ME to Ontario (PWM - ONT)

PWM — ONT
Sep 25 — Oct 21
Fri 9/25
Fri 10/2
1 adult, Economy
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Cheap flight deals from Portland to Ontario

Cheapest flights from Portland to Ontario

Thu 10/222:09 pm -
1 stop10h 45m
Fri 10/3012:16 pm -
1 stop8h 19m
Deal found 8/22$359
Wed 12/164:53 pm -
2 stops10h 05m
Wed 1/66:00 am -
2 stops13h 23m
Deal found 8/24$370
Thu 9/106:00 am -
1 stop8h 05m
Wed 9/1612:17 pm -
1 stop8h 11m
Deal found 8/25$383
Thu 10/222:09 pm -
1 stop10h 45m
Wed 10/2812:16 pm -
1 stop8h 19m
Deal found 8/22$406
Sat 10/313:23 pm -
1 stop8h 28m
Tue 11/35:00 am -
1 stop8h 02m
Deal found 8/24$469
Wed 10/215:08 pm -
1 stop8h 41m
Sun 11/15:00 am -
1 stop8h 02m
Deal found 8/24$477
Thu 9/177:40 am -
1 stop11h 30m
Mon 9/218:40 pm -
2 stops10h 15m
Deal found 8/24$481
Thu 10/293:23 pm -
1 stop8h 28m
Sat 10/315:00 am -
1 stop8h 02m
Deal found 8/26$485
Sat 9/126:00 am -
2 stops15h 11m
Sat 10/36:00 am -
2 stops14h 28m
Deal found 8/25$487

Find flight deals from Portland to Ontario

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$359
(Delta)

One-way from

$188
(United Airlines)

Popular in

April

Cheapest in

February

Average price

$613
Provider with most accurate pricing for Portland-Ontario flight deals.
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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
Highest demand for flights based on searches. 9% potential increase in price ($61 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($42 potential savings vs. average RT price).
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Average for round-trip flights in August 2026
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Cheapflights Fare Finder

 
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

Cheapest round-trip

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Wed 12/16

4:53 pm-11:58 pm

2 stops10h 05m

Ontario

Wed 1/6

6:00 am-10:23 pm

2 stops13h 23m

$370
Quickest round-trip

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Thu 9/10

6:00 am-11:05 am

1 stop8h 05m

Ontario

Wed 9/16

12:17 pm-11:28 pm

1 stop8h 11m

$383

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Sun 11/22

3:23 pm-8:51 pm

1 stop8h 28m

Ontario

Thu 11/26

5:00 am-4:02 pm

1 stop8h 02m

$469

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Wed 10/28

3:23 pm-8:51 pm

1 stop8h 28m

Ontario

Sat 10/31

5:00 am-4:02 pm

1 stop8h 02m

$469

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Sat 10/31

3:23 pm-8:51 pm

1 stop8h 28m

Ontario

Tue 11/3

5:00 am-4:02 pm

1 stop8h 02m

$469

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Thu 10/29

8:29 am-8:15 pm

2 stops14h 46m

Ontario

Sat 10/31

5:00 am-4:02 pm

1 stop8h 02m

$474

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Wed 10/21

5:08 pm-10:49 pm

1 stop8h 41m

Ontario

Sun 11/1

5:00 am-4:02 pm

1 stop8h 02m

$477

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Thu 9/17

7:40 am-4:10 pm

1 stop11h 30m

Ontario

Mon 9/21

8:40 pm-9:55 am

2 stops10h 15m

$493

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Thu 9/10

4:57 pm-10:59 pm

1 stop9h 02m

Ontario

Wed 9/16

6:08 am-7:24 pm

2 stops10h 16m

$498

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Thu 10/8

5:20 am-2:00 pm

2 stops11h 40m

Ontario

Mon 10/12

9:30 pm-10:55 am

2 stops10h 25m

$509

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/23

Showing 1-10 of 21 resultsSorted by cheapest first
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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 August.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust 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

Cheapflights Insights

Everything you need to know about your flight from Portland to Ontario

How much does it cost to fly round-trip from Portland, Maine to Ontario?

Airfare is below average for this route at the moment.

Portland, Maine to Ontario flights typically cost between $374 and $607 in October.
The cheapest round-trip price found within the last 5 days was $359 on Delta (Oct 22-Oct 30).

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
7.8
Good
8,529 reviews

Crew

8.5

Entertainment

7.8

Food

7.2

Overall

7.8

Comfort

7.8

Boarding

8.1

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
7.8
Good
8,529 reviews
Delta
7.8
Good
8,529 reviews

Crew

8.5

Entertainment

7.8

Food

7.2

Overall

7.8

Comfort

7.8

Boarding

8.1

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
7.1
Good
11,995 reviews
Delta
7.8
Good
8,529 reviews

Crew

8.5

Entertainment

7.8

Food

7.2

Overall

7.8

Comfort

7.8

Boarding

8.1

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 Delta and United Airlines fly from Portland, Maine to Ontario in about 8h 28m. The time it takes to get you to your destination can typically vary by up to 1h 37m. 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 $302, was found to be the cheapest airline from Portland, Maine to Ontario. An alternate airline flying to your destination would be American Airlines. Users have found that Delta is 46% 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Top 2 airlines flying from Portland to Ontario

AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$302Average$373FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$360Average$456FlexibilityNo cancel feeOn-time71%

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