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$63+ Cheap flights from Ontario to Portland (ONT - PDX)

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 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PDX
May 20 — May 271
Tue 5/20
Tue 5/27
1 adult, Economy
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Find cheap flights from Ontario to Portland 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

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3. Compare prices and book

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Cheapflights Tip: The best prices from Ontario to Portland are usually found in September or October, booked 24 days in advance, depart on a Tuesday or Saturday and return on a Thursday

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 (PDX). 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 May 15, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$89
(CheapOair)

One-way from

$63
(FlightHub)

Popular in

May

Cheapest in

September

Average price

$266

Good round-trip deal

$142 or less

Good one-way deal

$96 or less
Provider with most accurate pricing for Ontario-Portland flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Portland flights.
Search Deals
From Ontario to Portland
Search Deals
One-way flight from Ontario to Portland
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($27 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2025
Search Deals
Price to beat on a round-trip flight from Ontario to Portland.
Search Deals
Price to beat on a one-way flight from Ontario to Portland.
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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 May 15, 2025.

This CheapOair deal was found by Cheapflights users on 5/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/222:30 pmONT - PDX
Nonstop2h 25mFrontier
Tue 6/2412:18 pmPDX - ONT
Nonstop2h 20mFrontier
Deal found 5/14$89
This Trip.com deal was found by Cheapflights users on 5/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/292:19 pmONT - PDX
Nonstop2h 31mMultiple Airlines
Tue 6/37:00 amPDX - ONT
Nonstop2h 17mMultiple Airlines
Deal found 5/15$172
This Alaska Airlines deal was found by Cheapflights users on 5/15. 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.
Sat 6/77:30 amONT - PDX
Nonstop2h 20mAlaska Airlines
Tue 6/107:00 amPDX - ONT
Nonstop2h 17mAlaska Airlines
Deal found 5/15$177
This Delta deal was found by Cheapflights users on 5/15. 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.
Tue 7/86:00 amONT - PDX
1 stop6h 18mDelta
Wed 7/97:05 pmPDX - ONT
1 stop4h 37mDelta
Deal found 5/15$237
This United Airlines deal was found by Cheapflights users on 5/14. 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.
Tue 9/166:00 amONT - PDX
1 stop6h 43mUnited Airlines
Fri 9/265:30 amPDX - ONT
1 stop6h 43mUnited Airlines
Deal found 5/14$248

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 May 15, 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 - PDX

ONTPDX

Ontario

Sun 6/22

2:30 pm-4:55 pm

Nonstop2h 25m

Portland

Tue 6/24

12:18 pm-2:38 pm

Nonstop2h 20m

$89

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 6/5

2:30 pm-4:55 pm

Nonstop2h 25m

Portland

Wed 6/11

9:41 pm-11:57 pm

Nonstop2h 16m

$158

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 6/7

7:30 am-9:50 am

Nonstop2h 20m

Portland

Tue 6/10

7:00 am-9:17 am

Nonstop2h 17m

$177

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 6/7

7:30 am-9:50 am

Nonstop2h 20m

Portland

Sun 6/8

7:00 am-9:17 am

Nonstop2h 17m

$187

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 6/10

6:00 am-12:22 pm

1 stop6h 22m

Portland

Tue 6/10

5:50 pm-10:46 pm

1 stop4h 56m

$197

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Mon 7/21

2:31 pm-4:49 pm

Nonstop2h 18m

$63

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 6/7

5:55 pm-8:26 pm

Nonstop2h 31m

$89

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 6/3

10:00 am-12:22 pm

Nonstop2h 22m

$110

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 6/14

5:13 pm-10:38 pm

1 stop5h 25m

$119

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 6/13

1:36 pm-6:35 pm

1 stop4h 59m

$184

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/15

Showing 1-10 of 13 results
1
2

Compare providers for flights from Ontario to Portland

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 Ontario to Portland in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy2 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice 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 Ontario-Portland flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Ontario-Portland flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Ontario-Portland flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Portland flights, Cheapflights users trust CheapOair the most. CheapOair 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 Ontario-Portland flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

The best insider tips for Ontario to Portland flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Ontario to Portland trip
Airlines
Frontier

Frontier's UpFront Plus offers empty middle seats for extra comfort.


Frontier Airlines offers Zone 1 boarding with carry-on purchase.

Read more about Frontierby Marisa Garcia
Alaska Airlines

Alaska Airlines offers 32” legroom in Main Cabin, ideal for short flights.


Alaska Airlines' Wi-Fi is a flat fee, great for work on short flights.

Read more about Alaska Airlinesby Robert Schrader
Airports
ONT

ONT offers a smooth security process with less congestion than LAX, making it ideal for quick departures.

Read more about ONTby Bill Fink
PDX

Use the MAX light rail for a convenient 40-minute ride to downtown Portland from PDX, with trains every 15 minutes.

Read more about PDXby Brandon Schultz
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

Robert Schrader

Robert Schrader

One of the web's original travel bloggers, Robert launched his first site Leave Your Daily Hell in 2009. Since then, he's expanded into destination niche sites (one each for Japan, Thailand and Taiwan), in addition to having written for the inflight magazines of Singapore Airlines and Korean Air. Overall, he's visited nearly 100 countries, and flies business as often as possible.

Read more
Bill Fink

Bill Fink

Expert on ONT

Bill Fink

Bill Fink

Bill is an award-winning travel writer with extensive credits covering airlines and the aviation industry for publications including AARP, AFAR, The Points Guy and Yahoo. Based in Portland, Oregon, Bill has traveled to more than 75 countries - and been late for his flight in most of them. He once achieved top-level frequent flier status for all of American, Delta and United Airlines during a single year.

Read more
Brandon Schultz

Brandon Schultz

Expert on PDX

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

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

How far ahead should I book a flight from Ontario to Portland?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Portland. Price data was last updated on May 9, 2025.

The price you pay for your flight from Ontario to Portland may vary depending on when you book. For the best chance of a lower fare, look to book 21 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, November is the cheapest month in which you can book a flight from Ontario to Portland (average of $277). Flying from Ontario to Portland in March is currently the most expensive (average of $369). 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 PDX?

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 May 15, 2025.

It’s typically best to fly out from Ontario to Portland in the afternoon. Doing so could potentially save you 49% on the flight price compared to flying in the evening, which is usually more expensive.

What is the cheapest day to fly from Ontario to Portland?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Portland. Price data was last updated on May 11, 2025.

Travelers seeking maximum savings on their Ontario to Portland flight should consider departing on Tuesday at noon when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Ontario to Portland

Explore weekly flight availability from Ontario to Portland. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated May 15, 2025.

The most flights from ONT to PDX are scheduled on a Monday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (6 on average).

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 ranges from 0.7 - 5.6 inches per month. November is typically the wettest month, when rainfall can reach 5.6 in. July is typically the driest time to visit Portland when rainfall is around 0.7 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, 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 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 41.0 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 May 15, 2025.
To help decide which airline to fly from Ontario to Portland, see what other customers have to say about Alaska Airlines, Southwest and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Comfort

7.9

Boarding

8.2

Entertainment

7.1

Overall

8.0

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

Crew

8.5

Food

7.1

Comfort

7.9

Boarding

8.2

Entertainment

7.1

Overall

8.0

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
4,291 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Comfort

7.9

Boarding

8.2

Entertainment

7.1

Overall

8.0

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

Crew

8.5

Food

7.1

Comfort

7.9

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,435 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Comfort

7.9

Boarding

8.2

Entertainment

7.1

Overall

8.0

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
8,731 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Comfort

7.9

Boarding

8.2

Entertainment

7.1

Overall

8.0

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 airports do I use to fly from Ontario to Portland?

    If you wish to fly to Portland from Ontario, then you need to book flights from Ontario to Portland. There are 6 flights from Ontario (ONT) to Portland (PDX) per day to choose from. Flights to Portland from Ontario are available from 7 different airlines, which means you should have some options if you want to compare airfare deals. 2h 17m is how long a nonstop flight from Ontario to Portland typically takes.

  • How popular is this Ontario to Portland flight route?

    Flights from Ontario to Portland have been viewed 97 times in the past calendar month.

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

    Cheapflights users have booked flights from Ontario to Portland round-trip from $89. Other airlines that can offer you cheap pricing are Alaska Airlines, from $177, and Delta, from $197. Users have found that Frontier is 54% cheaper than the other options available to this destination.

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

    One-way options have recently been found by users for as low as $63 on Frontier. Other airlines that offer cheap prices include Alaska Airlines from $89 and Hawaiian Airlines from $110 one-way.

  • What are the most reliable airlines from Ontario to Portland?

    Before booking your flight to Portland from Ontario, check out the most reliable airlines to get you to your destination on time: SkyWest Airlines (100%), British Airways (100%), Hawaiian Airlines( 96%).

  • What are the cheapest flights from Ontario to Portland?

    On average you can expect to pay $231 for a flight from Ontario to Portland. The cheapest flight overall is $39 while the most popular route, (Ontario - Portland) is currently priced at $94.

  • 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?

    Currently, November is the cheapest month in which you can book a flight from Ontario to Portland (average of $277). Flying from Ontario to Portland in March is currently the most expensive (average of $369). 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
Seaside
Lincoln City
Beaverton
Clackamas
Vancouver
McMinnville
Lake Oswego
Hillsboro
Gresham
Astoria
Long Beach
Cannon Beach
Tigard
Hood River
Woodburn
Depoe Bay
Pacific City
Stevenson
Troutdale
Wilsonville

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Alternative routes for Ontario to Portland

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Top 7 airlines flying from Ontario to Portland

Discover the top 7 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 May 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$48Average$96FlexibilityNo cancel feeOn-time65%
FrontierCheapest$56Average$126FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$108Average$257FlexibilityNo cancel feeOn-time85%
DeltaCheapest$137Average$267FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$156Average$261FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$176Average$277FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$176Average$295FlexibilityNo cancel feeOn-time63%

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