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$126+ Cheap flights from Ontario to Portland, ME (ONT - PWM)

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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PWM
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
1 adult, Economy
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Cheap flight deals from Ontario to Portland

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Portland (PWM). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated junio 12, 2025.

Round-trip from

$297
(Delta)

One-way from

$126
(American Airlines)

Popular in

November

Cheapest in

January

Average price

$447
From Ontario to Portland
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One-way flight from Ontario to Portland
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Highest demand for flights based on searches. 24% potential increase in price ($155 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($27 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Ontario to Portland

Cheapest flights from Ontario to Portland
Explore the most affordable flight options available from Ontario to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on junio 12, 2025.

This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/3011:45 amONT - PWM
1 stop9h 18mDelta
mié. 9/101:34 pmPWM - ONT
1 stop8h 37mDelta
Deal found 6/10$297
This JetBlue deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/211:45 pmONT - PWM
1 stop10h 37mJetBlue
jue. 9/112:17 pmPWM - ONT
1 stop10h 12mJetBlue
Deal found 6/11$320
This Southwest deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/49:20 pmONT - PWM
1 stop9h 30mSouthwest
vie. 8/85:50 amPWM - ONT
1 stop8h 45mSouthwest
Deal found 6/11$345
This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/215:05 amONT - PWM
1 stop7h 43mUnited Airlines
mar. 10/284:48 pmPWM - ONT
1 stop8h 43mUnited Airlines
Deal found 6/11$351
This American Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/166:10 amONT - PWM
2 stops11h 14mAmerican Airlines
mar. 7/225:55 amPWM - ONT
2 stops13h 19mAmerican Airlines
Deal found 6/11$378
This Frontier deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/295:09 pmONT - PWM
2 stops16h 37mFrontier
sáb. 9/66:12 pmPWM - ONT
2 stops18h 39mFrontier
Deal found 6/11$483
This Alaska Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/46:00 amONT - PWM
2 stops11h 42mAlaska Airlines
vie. 9/52:02 pmPWM - ONT
2 stops12h 51mAlaska Airlines
Deal found 6/10$664

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to Portland that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated junio 12, 2025.
Use the filters below to find and compare flights from Ontario to Portland that are best for you.

Fly from

Ontario

Fly to

Portland

Route

Depart

Return

Price

OntarioPortland

ONT - PWM

ONTPWM

Ontario

sáb. 8/30

11:45 am-12:03 am

1 stop9h 18m

Portland

mié. 9/10

1:34 pm-7:11 pm

1 stop8h 37m

$297

OntarioPortland

ONT - PWM

ONTPWM

Ontario

mar. 9/2

11:45 pm-1:22 pm

1 stop10h 37m

Portland

jue. 9/11

2:17 pm-9:29 pm

1 stop10h 12m

$320

OntarioPortland

ONT - PWM

ONTPWM

Ontario

lun. 8/4

9:20 pm-9:50 am

1 stop9h 30m

Portland

vie. 8/8

5:50 am-11:35 am

1 stop8h 45m

$345

OntarioPortland

ONT - PWM

ONTPWM

Ontario

mar. 10/21

5:05 am-3:48 pm

1 stop7h 43m

Portland

mar. 10/28

4:48 pm-10:31 pm

1 stop8h 43m

$351

OntarioPortland

ONT - PWM

ONTPWM

Ontario

mié. 7/16

6:10 am-8:24 pm

2 stops11h 14m

Portland

mar. 7/22

5:55 am-4:14 pm

2 stops13h 19m

$378

OntarioPortland

ONT - PWM

ONTPWM

Ontario

vie. 8/29

5:09 pm-12:46 pm

2 stops16h 37m

Portland

sáb. 9/6

6:12 pm-9:51 am

2 stops18h 39m

$483

OntarioPortland

ONT - PWM

ONTPWM

Ontario

jue. 9/4

6:00 am-8:42 pm

2 stops11h 42m

Portland

vie. 9/5

2:02 pm-11:53 pm

2 stops12h 51m

$664

OntarioPortland

ONT - PWM

ONTPWM

Ontario

mié. 9/3

6:10 am-5:45 pm

1 stop8h 35m

$126

OntarioPortland

ONT - PWM

ONTPWM

Ontario

mar. 7/22

11:40 am-12:38 am

1 stop9h 58m

$149

OntarioPortland

ONT - PWM

ONTPWM

Ontario

lun. 8/11

11:45 pm-1:23 pm

1 stop10h 38m

$156

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 13 results
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Best time to book a flight from Ontario to Portland

Have a flexible travel schedule? Discover the best time to fly to Portland from Ontario 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 Ontario to Portland

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

Currently, January is the cheapest month in which you can book a flight from Ontario to Portland, Maine (average of $296). Flying from Ontario to Portland, Maine in July is currently the most expensive (average of $394). 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.

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

Find hourly flight availability from Ontario to Portland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated junio 12, 2025.

A simple way to save on the total cost of your ticket is to fly from Ontario to Portland, Maine in the afternoon. If you’re flexible enough to do this you can expect to save up to 36% on your trip compared to booking a flight in the morning.

Rainfall in Portland by month

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

In terms of precipitation, rainfall in Portland, Maine ranges from 2.9 - 4.5 inches per month. November is typically the wettest month, when rainfall can reach 4.5 in. August is typically the driest time to visit Portland, Maine when rainfall is around 2.9 in.

Temperature in Portland by month

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

If weather is an important factor for your trip to Portland, Maine, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Portland

Get insights into the airlines that provide service to Portland. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Portland. Reviews last updated junio 12, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Ontario to Portland. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
JetBlue
7.3
Good
2,925 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Portland. 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 Ontario to Portland, Maine round-trip?

    Currently priced at $297, Delta will fly you from Ontario to Portland, Maine and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from JetBlue and Southwest - these airlines can fly you to your destination from $320 and $345, respectively. Delta is 38% cheaper than the average price of flights available within the next 90 days to this destination.

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

    $126 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Delta and JetBlue, with prices starting from $149 and $156, respectively.

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

    Yes. In addition to deals on Ontario to Portland flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Portland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Portland.

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

    Yes. Cheapflights offers flight deals from Ontario to Portland 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 Ontario to Portland, Maine?

    Currently, January is the cheapest month in which you can book a flight from Ontario to Portland, Maine (average of $296). Flying from Ontario to Portland, Maine in July is currently the most expensive (average of $394). 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

Traveling to a place near Ontario?

Book flights to Ontario if you plan to visit one of these locations
North Conway
Bath
Brunswick
Auburn
Conway
Lewiston

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Top 5 airlines flying from Ontario to Portland

Discover the top 5 airlines that operate flights from Ontario to Portland. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$259Average$392FlexibilityNo cancel feeOn-time62%
DeltaCheapest$287Average$491FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$300Average$478FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$384Average$658FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$523Average$746FlexibilityNo cancel feeOn-time63%

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