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Portland

$101+ 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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PDX
Jul 28 — Aug 41
Tue 7/28
Tue 8/4
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

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.
Cheapflights Tip: The best prices from Ontario to Portland are usually found in October or September, booked 80 days in advance, depart on a Friday or Monday and return on a Friday

Cheap 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 June 28, 2026.

This Frontier deal was found by Cheapflights users on 6/22. 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.
Wed 7/156:00 am
ONT
-
PDX
1 stop10h 36m
Frontier
Sat 7/2512:20 pm
PDX
-
ONT
1 stop11h 30m
Frontier
Deal found 6/22$235
This Booking.com deal was found by Cheapflights users on 6/22. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/263:40 pm
ONT
-
PDX
1 stop21h 12m
Frontier
Sun 8/301:47 pm
PDX
-
ONT
1 stop18h 16m
Frontier
Deal found 6/22$237
This Trip.com deal was found by Cheapflights users on 6/23. 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.
Sat 9/53:40 pm
ONT
-
PDX
1 stop21h 12m
Frontier
Tue 9/85:56 pm
PDX
-
ONT
1 stop5h 59m
Frontier
Deal found 6/23$238
This Super.com deal was found by Cheapflights users on 6/23. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1011:52 am
ONT
-
PDX
1 stop5h 02m
Frontier
Tue 7/145:16 pm
PDX
-
ONT
1 stop6h 34m
Frontier
Deal found 6/23$239
This Frontier deal was found by Cheapflights users on 6/24. 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.
Mon 8/311:52 am
ONT
-
PDX
1 stop5h 02m
Frontier
Mon 8/3112:20 pm
PDX
-
ONT
1 stop11h 35m
Frontier
Deal found 6/24$240
This Frontier deal was found by Cheapflights users on 6/24. 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.
Sat 8/156:00 am
ONT
-
PDX
1 stop10h 51m
Frontier
Sun 8/166:49 pm
PDX
-
ONT
1 stop21h 05m
Frontier
Deal found 6/24$241
This Southwest deal was found by Cheapflights users on 6/23. 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.
Sat 8/13:00 pm
ONT
-
PDX
1 stop4h 05m
Southwest
Wed 8/511:35 am
PDX
-
ONT
1 stop6h 15m
Southwest
Deal found 6/23$242
This Frontier deal was found by Cheapflights users on 6/24. 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.
Fri 7/1010:49 am
ONT
-
PDX
1 stop6h 02m
Frontier
Wed 7/295:21 pm
PDX
-
ONT
1 stop6h 29m
Frontier
Deal found 6/24$243
This Kiwi.com deal was found by Cheapflights users on 6/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2210:49 am
ONT
-
PDX
1 stop5h 47m
Frontier
Fri 7/245:49 pm
PDX
-
ONT
1 stop14h 14m
Frontier
Deal found 6/27$244
This Booking.com deal was found by Cheapflights users on 6/24. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/911:52 am
ONT
-
PDX
1 stop6h 12m
Frontier
Tue 7/145:16 pm
PDX
-
ONT
1 stop6h 34m
Frontier
Deal found 6/24$245
This United Airlines deal was found by Cheapflights users on 6/23. 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 7/146:00 am
ONT
-
PDX
1 stop4h 20m
United Airlines
Tue 7/146:03 pm
PDX
-
ONT
1 stop4h 34m
United Airlines
Deal found 6/23$247
This Frontier deal was found by Cheapflights users on 6/25. 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.
Thu 7/911:52 am
ONT
-
PDX
1 stop6h 12m
Frontier
Fri 7/2412:20 pm
PDX
-
ONT
1 stop11h 30m
Frontier
Deal found 6/25$248

Find 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 June 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$235
(Frontier)

One-way from

$101
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$310

Good round-trip deal

$332 or less

Good one-way deal

$183 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. 11% potential increase in price ($30 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
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.
Search Deals

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 June 28, 2026.
Use the filters below to find and compare flights from Ontario to Portland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 8/1

3:00 pm-7:05 pm

1 stop4h 05m

Portland

Wed 8/5

11:35 am-5:50 pm

1 stop6h 15m

$242

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 8/1

5:10 pm-10:38 pm

1 stop5h 28m

Portland

Wed 8/5

5:30 am-11:16 am

1 stop5h 46m

$247

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 8/1

4:55 pm-11:55 pm

2 stops7h 00m

Portland

Tue 8/4

11:35 am-5:50 pm

1 stop6h 15m

$252
Quickest round-trip

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 8/14

5:32 pm-7:49 pm

Nonstop2h 17m

Portland

Mon 8/17

7:36 am-9:56 am

Nonstop2h 20m

$297

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 9/17

12:00 pm-6:25 pm

1 stop6h 25m

Portland

Sat 9/19

11:20 am-8:05 pm

2 stops8h 45m

$298

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Mon 7/6

4:00 pm-10:05 pm

1 stop6h 05m

Portland

Wed 7/8

4:05 pm-8:15 pm

1 stop4h 10m

$307

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Mon 7/6

6:35 pm-11:25 pm

1 stop4h 50m

Portland

Tue 7/7

5:15 am-11:30 am

1 stop6h 15m

$307

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 7/16

6:30 pm-11:25 pm

1 stop4h 55m

Portland

Sun 7/19

5:20 am-11:15 am

1 stop5h 55m

$323

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 8/20

7:13 pm-12:30 am

1 stop5h 17m

Portland

Mon 8/24

7:00 am-12:12 pm

1 stop5h 12m

$328

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sun 7/19

7:00 am-9:21 am

Nonstop2h 21m

Portland

Thu 7/23

7:36 am-9:56 am

Nonstop2h 20m

$357

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/22

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

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 June.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapfaremartPrice Accuracy-Trust Score*1 star
eDreamsPrice Accuracy2 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
PricelinePrice Accuracy1 starTrust 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Portland flight deals on Cheapflights vs. FlightHub >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 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 Ontario-Portland 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 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?

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 35 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, October is the cheapest month in which you can book a flight from Ontario to Portland (average of $181). Flying from Ontario to Portland in June is currently the most expensive (average of $312). 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 June 28, 2026.

It’s typically best to fly out from Ontario to Portland in the evening. Doing so could potentially save you 67% on the flight price compared to flying in the morning, 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 June 20, 2026.

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

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

The best insider tips for Ontario to Portland flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Ontario to Portland trip
Our travel experts
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

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
Marisa Garcia

Marisa Garcia

Expert on Frontier

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
Bill Fink

Bill Fink

Expert on ONT

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 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

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 June 28, 2026.
Read reviews from past customers who have flown Alaska Airlines,Southwest, andHawaiian Airlines from Ontario to Portland. 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.
Alaska Airlines
7.9
Good
12,583 reviews

Entertainment

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.0

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Franzi,Mar 2026

SFO - PDX

I love flying with Alaska. I think they sre the best airline.
Alaska Airlines
7.9
Good
12,583 reviews
Alaska Airlines
7.9
Good
12,583 reviews

Entertainment

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.0

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Franzi,Mar 2026

SFO - PDX

I love flying with Alaska. I think they sre the best airline.
Southwest
7.9
Good
4,246 reviews
Alaska Airlines
7.9
Good
12,583 reviews

Entertainment

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.0

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Franzi,Mar 2026

SFO - PDX

I love flying with Alaska. I think they sre the best airline.
Hawaiian Airlines
7.8
Good
2,826 reviews
Alaska Airlines
7.9
Good
12,583 reviews

Entertainment

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.0

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Franzi,Mar 2026

SFO - PDX

I love flying with Alaska. I think they sre the best airline.
United Airlines
7.4
Good
9,901 reviews
Alaska Airlines
7.9
Good
12,583 reviews

Entertainment

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.0

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Franzi,Mar 2026

SFO - PDX

I love flying with Alaska. I think they sre the best airline.
Frontier
5.6
Fair
2,858 reviews
Alaska Airlines
7.9
Good
12,583 reviews

Entertainment

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.0

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Franzi,Mar 2026

SFO - PDX

I love flying with Alaska. I think they sre the best airline.

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 is 1 flight from Ontario (ONT) to Portland (PDX) per day to choose from. Flights to Portland from Ontario are available from 6 different airlines, which means you should have some options if you want to compare airfare deals. 2h 15m 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 26 times in the past calendar month.

  • How long is the flight from Ontario to Portland?

    For as low as $297, Southwest can have you in Portland from Ontario in 2h 17m. There are 839 mi between Ontario and Portland. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Cheapflights users have booked flights from Ontario to Portland round-trip from $75. Other airlines that can offer you cheap pricing are Delta, from $78, and Hawaiian Airlines, from $81. Users have found that Frontier is 68% 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 $49 on Frontier. Other airlines that offer cheap prices include Southwest from $78 and Hawaiian Airlines from $88 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%), Alaska Airlines (90%), Hawaiian Airlines( 89%).

  • What are the cheapest flights from Ontario to Portland?

    On average you can expect to pay $451 for a flight from Ontario to Portland. The cheapest flight overall is $178 while the most popular route, (Ontario - Portland) is currently priced at $226.

  • 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, October is the cheapest month in which you can book a flight from Ontario to Portland (average of $181). Flying from Ontario to Portland in June is currently the most expensive (average of $312). 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 Portland?

Book flights to Portland if you plan to visit one of these locations
Beaverton
Seaside
Vancouver
Lincoln City
Longview
Lake Oswego
Hillsboro
Clackamas
Kelso
Troutdale
Cannon Beach
Long Beach
McMinnville
The Dalles
Wilsonville
Depoe Bay
Stevenson
Tillamook
Astoria
Gresham

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Ontario to Portland

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Ontario to Portland

Discover the top 6 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 June 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$75Average$163FlexibilityNo cancel feeOn-time62%
DeltaCheapest$78Average$282FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$81Average$197FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$157Average$298FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$166Average$265FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$166Average$272FlexibilityNo cancel feeOn-time63%

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