HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portland

$55+ 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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — PDX
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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 January or October, booked 85 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 December 4, 2025.

This Southwest deal was found by Cheapflights users on 12/3. 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.
Wed 12/243:30 pmONT - PDX
1 stop7h 00mSouthwest
Thu 1/17:00 amPDX - ONT
1 stop4h 55mSouthwest
Deal found 12/3$162
This Frontier deal was found by Cheapflights users on 12/3. 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.
Tue 12/236:00 amONT - PDX
1 stop7h 24mFrontier
Thu 1/12:19 pmPDX - ONT
1 stop6h 58mFrontier
Deal found 12/3$164
This Alaska Airlines deal was found by Cheapflights users on 12/3. 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.
Wed 12/246:05 pmONT - PDX
Nonstop2h 25mAlaska Airlines
Sat 1/39:38 pmPDX - ONT
Nonstop2h 21mAlaska Airlines
Deal found 12/3$171
This Expedia deal was found by Cheapflights users on 12/3. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:05 pmONT - PDX
Nonstop2h 25mMultiple Airlines
Thu 1/12:19 pmPDX - ONT
1 stop6h 58mMultiple Airlines
Deal found 12/3$176
This Alaska Airlines deal was found by Cheapflights users on 12/4. 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.
Thu 12/257:00 amONT - PDX
Nonstop2h 29mAlaska Airlines
Thu 12/259:38 pmPDX - ONT
Nonstop2h 21mAlaska Airlines
Deal found 12/4$177
This Frontier deal was found by Cheapflights users on 12/2. 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.
Tue 12/236:00 amONT - PDX
1 stop7h 24mFrontier
Thu 12/2512:47 pmPDX - ONT
1 stop11h 12mFrontier
Deal found 12/2$188
This Alaska Airlines deal was found by Cheapflights users on 12/3. 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.
Thu 12/256:05 pmONT - PDX
Nonstop2h 25mAlaska Airlines
Sat 1/39:38 pmPDX - ONT
Nonstop2h 21mAlaska Airlines
Deal found 12/3$191
This Southwest deal was found by Cheapflights users on 12/3. 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.
Thu 12/2510:15 amONT - PDX
1 stop9h 40mSouthwest
Mon 12/295:50 amPDX - ONT
1 stop5h 35mSouthwest
Deal found 12/3$192
This Alaska Airlines deal was found by Cheapflights users on 12/3. 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.
Wed 12/316:05 pmONT - PDX
Nonstop2h 25mAlaska Airlines
Wed 1/710:46 amPDX - ONT
Nonstop2h 20mAlaska Airlines
Deal found 12/3$193
This Travelocity deal was found by Cheapflights users on 12/3. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:05 pmONT - PDX
Nonstop2h 25mMultiple Airlines
Thu 1/12:19 pmPDX - ONT
1 stop6h 58mMultiple Airlines
Deal found 12/3$196
This Kiwi.com deal was found by Cheapflights users on 12/4. 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 12/246:45 amONT - PDX
1 stop28h 58mMultiple Airlines
Sun 1/255:50 pmPDX - ONT
Nonstop2h 20mMultiple Airlines
Deal found 12/4$207
This Kiwi.com deal was found by Cheapflights users on 12/4. 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 12/246:45 amONT - PDX
1 stop28h 58mMultiple Airlines
Thu 12/259:38 pmPDX - ONT
Nonstop2h 21mMultiple Airlines
Deal found 12/4$208

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 December 4, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$160
(Southwest)

One-way from

$55
(Southwest)

Popular in

March

Cheapest in

January

Average price

$243

Good round-trip deal

$193 or less

Good one-way deal

$109 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. 10% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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.
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 December 4, 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

Wed 2/18

7:00 am-9:28 am

Nonstop2h 28m

Portland

Sat 2/21

6:00 am-11:32 pm

1 stop17h 32m

$162

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 1/8

5:07 pm-10:54 pm

1 stop5h 47m

Portland

Sun 1/11

5:50 am-12:16 pm

1 stop6h 26m

$166

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 12/25

7:00 am-9:29 am

Nonstop2h 29m

Portland

Wed 12/31

9:38 pm-11:59 pm

Nonstop2h 21m

$177

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 1/16

1:46 pm-4:20 pm

Nonstop2h 34m

Portland

Fri 1/23

2:43 pm-5:03 pm

Nonstop2h 20m

$177

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 1/23

5:10 pm-11:55 pm

1 stop6h 45m

Portland

Sun 1/25

7:10 am-1:56 pm

1 stop6h 46m

$180

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 1/8

4:03 pm-8:47 pm

1 stop4h 44m

Portland

Sun 1/18

5:50 pm-8:10 pm

Nonstop2h 20m

$181

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 1/22

6:00 am-12:38 pm

1 stop6h 38m

Portland

Sun 1/25

2:43 pm-5:03 pm

Nonstop2h 20m

$181

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Mon 1/12

3:20 pm-10:05 pm

2 stops6h 45m

Portland

Thu 1/15

7:10 am-12:15 pm

1 stop5h 05m

$197

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 1/2

5:20 pm-9:55 pm

1 stop4h 35m

Portland

Tue 1/6

9:00 am-2:40 pm

1 stop5h 40m

$198

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sun 1/11

6:00 am-12:38 pm

1 stop6h 38m

Portland

Thu 1/15

2:43 pm-5:03 pm

Nonstop2h 20m

$207

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Showing 1-10 of 20 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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapfaremartPrice Accuracy-Trust Score*1 star
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.

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 November 28, 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 85 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, March is the cheapest month in which you can book a flight from Ontario to Portland (average of $42). Flying from Ontario to Portland in July is currently the most expensive (average of $89). 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 December 4, 2025.

It’s typically best to fly out from Ontario to Portland at noon. Doing so could potentially save you 43% 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 November 29, 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. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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
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

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 December 4, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta 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
8.0
Very good
11,396 reviews

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Christine,Nov 2025

MIA - PDX

Just got on, logged in, and zoned out on some TV sit calm. Flight was easy Miami airport is something else!!! what a mess and now that I think of it, the luggage desk staff was super slow, I began to get irritated over paper running out, TSA was at the the end of the desk and the agent was assuring us we would get on flight, we arrived early, just didn't find the Alaska desk due to miss information. We walked that airport back and forth 3times. Language barriers were part of that fiasco and searching for American Airlines didn't help. (rolling my eyes)
Alaska Airlines
8.0
Very good
11,396 reviews
Alaska Airlines
8.0
Very good
11,396 reviews

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Christine,Nov 2025

MIA - PDX

Just got on, logged in, and zoned out on some TV sit calm. Flight was easy Miami airport is something else!!! what a mess and now that I think of it, the luggage desk staff was super slow, I began to get irritated over paper running out, TSA was at the the end of the desk and the agent was assuring us we would get on flight, we arrived early, just didn't find the Alaska desk due to miss information. We walked that airport back and forth 3times. Language barriers were part of that fiasco and searching for American Airlines didn't help. (rolling my eyes)
Southwest
8.0
Very good
4,252 reviews
Alaska Airlines
8.0
Very good
11,396 reviews

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Christine,Nov 2025

MIA - PDX

Just got on, logged in, and zoned out on some TV sit calm. Flight was easy Miami airport is something else!!! what a mess and now that I think of it, the luggage desk staff was super slow, I began to get irritated over paper running out, TSA was at the the end of the desk and the agent was assuring us we would get on flight, we arrived early, just didn't find the Alaska desk due to miss information. We walked that airport back and forth 3times. Language barriers were part of that fiasco and searching for American Airlines didn't help. (rolling my eyes)
Delta
7.9
Good
8,011 reviews
Alaska Airlines
8.0
Very good
11,396 reviews

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Christine,Nov 2025

MIA - PDX

Just got on, logged in, and zoned out on some TV sit calm. Flight was easy Miami airport is something else!!! what a mess and now that I think of it, the luggage desk staff was super slow, I began to get irritated over paper running out, TSA was at the the end of the desk and the agent was assuring us we would get on flight, we arrived early, just didn't find the Alaska desk due to miss information. We walked that airport back and forth 3times. Language barriers were part of that fiasco and searching for American Airlines didn't help. (rolling my eyes)
Hawaiian Airlines
7.8
Good
2,815 reviews
Alaska Airlines
8.0
Very good
11,396 reviews

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Christine,Nov 2025

MIA - PDX

Just got on, logged in, and zoned out on some TV sit calm. Flight was easy Miami airport is something else!!! what a mess and now that I think of it, the luggage desk staff was super slow, I began to get irritated over paper running out, TSA was at the the end of the desk and the agent was assuring us we would get on flight, we arrived early, just didn't find the Alaska desk due to miss information. We walked that airport back and forth 3times. Language barriers were part of that fiasco and searching for American Airlines didn't help. (rolling my eyes)
Frontier
5.8
Fair
3,092 reviews
Alaska Airlines
8.0
Very good
11,396 reviews

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Christine,Nov 2025

MIA - PDX

Just got on, logged in, and zoned out on some TV sit calm. Flight was easy Miami airport is something else!!! what a mess and now that I think of it, the luggage desk staff was super slow, I began to get irritated over paper running out, TSA was at the the end of the desk and the agent was assuring us we would get on flight, we arrived early, just didn't find the Alaska desk due to miss information. We walked that airport back and forth 3times. Language barriers were part of that fiasco and searching for American Airlines didn't help. (rolling my eyes)

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 3 flights 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 22m 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 59 times in the past calendar month.

  • How long is the flight from Ontario to Portland?

    For as low as $162, Alaska Airlines can have you in Portland from Ontario in 2h 28m. 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 $69. Other airlines that can offer you cheap pricing are Delta, from $78, and Hawaiian Airlines, from $88. Users have found that Frontier is 67% 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 $34 on Frontier. Other airlines that offer cheap prices include Southwest from $78 and Alaska 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: British Airways (98%), Horizon Air (91%), Alaska Airlines( 84%).

  • What are the cheapest flights from Ontario to Portland?

    On average you can expect to pay $219 for a flight from Ontario to Portland. The cheapest flight overall is $49 while the most popular route, (Ontario - Portland) is currently priced at $137.

  • 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, March is the cheapest month in which you can book a flight from Ontario to Portland (average of $42). Flying from Ontario to Portland in July is currently the most expensive (average of $89). 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
Vancouver
Seaside
Clackamas
Lincoln City
Lake Oswego
Beaverton
McMinnville
Hillsboro
Troutdale
Cannon Beach
Long Beach
Longview
Tigard
The Dalles
Depoe Bay
Stevenson
Wilsonville
Pacific City
Tillamook
Gresham

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 Ontario to Portland

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Portland flights
San Francisco to Portland flights
Santa Ana to Portland flights
Los Angeles to Boise flights
San Diego to Portland flights
Burbank to Portland flights
Los Angeles to Redmond flights
San Jose to Portland flights
San Francisco to Boise flights
San Diego to Boise flights
Las Vegas to Portland flights
Oakland to Portland flights
Sacramento to Portland flights
San Francisco to Eugene flights
Los Angeles to Eugene flights
San Francisco to Redmond flights
Burbank to Boise flights
Ontario to Boise flights
Santa Ana to Boise flights
San Jose to Boise flights
Palm Springs to Portland flights
Santa Rosa to Portland flights
Los Angeles to Medford flights
Las Vegas to Boise flights
Burbank to Redmond flights
Sacramento to Boise flights
Ontario to Eugene flights
Ontario to Redmond flights
Fresno to Portland flights
Burbank to Eugene flights
Santa Barbara to Portland flights
San Jose to Eugene flights
Oakland to Eugene flights
San Luis Obispo to Portland flights
Sacramento to Eugene flights
Medford to Portland flights
San Diego to Redmond flights
San Diego to Medford flights
San Francisco to Medford flights
Oakland to Boise flights
Ontario to Medford flights
Long Beach to Portland flights
San Diego to Eugene flights
Fresno to Boise flights
Reno to Portland flights
Long Beach to Boise flights
Santa Ana to Redmond flights
Medford to Boise flights
Palm Springs to Eugene flights

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 December 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$77Average$160FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$88Average$247FlexibilityNo cancel feeOn-time85%
DeltaCheapest$137Average$296FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$153Average$235FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$166Average$272FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$166Average$269FlexibilityNo cancel feeOn-time63%

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.