£88 Cheap Flights from Portland (PDX) to Ontario Intl. Airport (ONT)

View £88 flight on Fri, 29 May 2026Opens in a new window

Popular airlines from Portland International Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT)

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Cheap Flights from Portland (PDX) to Ontario Intl. Airport (ONT)

Prices were available within the past 7 days and start at £88 for one-way flights and £153 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Thu, 28 May - Sat, 6 Jun
PDX
Portland
ONT
Ontario
£153 Return, found 3 days ago
£153
Return
found 3 days ago
Select Alaska Airlines flight, departing Thu, 28 May from Portland to Ontario, returning Sat, 6 Jun, priced at £153 found 3 days ago
Alaska Airlines
Thu, 28 May - Mon, 1 Jun
PDX
Portland
ONT
Ontario
£161 Return, found 3 days ago
£161
Return
found 3 days ago
Select Alaska Airlines flight, departing Thu, 28 May from Portland to Ontario, returning Mon, 1 Jun, priced at £161 found 3 days ago
Alaska Airlines
Thu, 28 May - Thu, 18 Jun
PDX
Portland
ONT
Ontario
£190 Return, found 3 days ago
£190
Return
found 3 days ago
Select Alaska Airlines flight, departing Thu, 28 May from Portland to Ontario, returning Thu, 18 Jun, priced at £190 found 3 days ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
PDX
Portland
ONT
Ontario
£220 Return, found 19 hours ago
£220
Return
found 19 hours ago
Select Alaska Airlines flight, departing Wed, 17 Jun from Portland to Ontario, returning Wed, 24 Jun, priced at £220 found 19 hours ago
Delta
Fri, 29 May - Sun, 14 Jun
PDX
Portland
ONT
Ontario
£249 Return, found 3 days ago
£249
Return
found 3 days ago
Select Delta flight, departing Fri, 29 May from Portland to Ontario, returning Sun, 14 Jun, priced at £249 found 3 days ago
Alaska Airlines
Wed, 20 May - Sun, 24 May
PDX
Portland
ONT
Ontario
£252 Return, found 5 days ago
£252
Return
found 5 days ago
Select Alaska Airlines flight, departing Wed, 20 May from Portland to Ontario, returning Sun, 24 May, priced at £252 found 5 days ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
PDX
Portland
ONT
Ontario
£265 Return, found 19 hours ago
£265
Return
found 19 hours ago
Select Alaska Airlines flight, departing Wed, 17 Jun from Portland to Ontario, returning Wed, 24 Jun, priced at £265 found 19 hours ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
PDX
Portland
ONT
Ontario
£271 Return, found 19 hours ago
£271
Return
found 19 hours ago
Select Alaska Airlines flight, departing Wed, 17 Jun from Portland to Ontario, returning Wed, 24 Jun, priced at £271 found 19 hours ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
PDX
Portland
ONT
Ontario
£272 Return, found 19 hours ago
£272
Return
found 19 hours ago
Select Alaska Airlines flight, departing Wed, 17 Jun from Portland to Ontario, returning Wed, 24 Jun, priced at £272 found 19 hours ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
PDX
Portland
ONT
Ontario
£279 Return, found 19 hours ago
£279
Return
found 19 hours ago
Select Alaska Airlines flight, departing Wed, 17 Jun from Portland to Ontario, returning Wed, 24 Jun, priced at £279 found 19 hours ago

Find the cheapest month to fly from Portland (PDX) to Ontario (ONT)

April is typically the cheapest month to fly

From £106 - £149 per traveller.

Frequently asked questions

How much does a flight from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) cost?
One-way flights typically cost between £484 and £1,255 and return flights often range between £484 and £1,255. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Anaa (AAA) to Toronto, ON (YYZ-Pearson Intl.) ticket fares go up or down.
What is the cheapest month to fly from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
August is typically the cheapest month to fly from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.), with average return fares of approximately £324. This is about 17% lower than the average price throughout the year. August sees lower prices because it falls after the peak summer travel season, when demand starts to decrease. Other cheap months to fly from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) include January and February.
How do I find cheap flights from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
To find a cheap flight from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
The best airline to fly with from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) will differ from traveller to traveller. If you like to fly early, AS offers early morning flights. If price is the most important factor, F9 typically offers the lowest fares. WN offers the most daily flights from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.), which is brilliant if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
When looking for the best time to fly from Portland International Airport (PDX) to Los Angeles - Ontario International Airport (ONT), it's helpful to balance good prices with plenty of flight options. Based on booking data from the past year, you'll find the cheapest flights in August and February, with average prices around £324 for a return trip. However, if you're looking for more flight availability and popular travel times, March and November tend to be busier. Since there isn't a single month that is both the cheapest and most popular, you can decide whether saving money or having more schedule flexibility is most important for your trip.
How many flights per day from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
There are approximately 51 connecting flights per day from Portland, OR (PDX-Portland Intl.) (PDX) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) (ONT). Some common connection points include Seattle - Tacoma Intl. (SEA), Denver Intl. (DEN), and Sky Harbor Intl. (PHX).
What is the earliest flight from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
The earliest flight from Portland International Airport (PDX) to Los Angeles - Ontario International Airport (ONT) typically departs at approximately 12:40 AM local time, operated by American Airlines. This is a seasonal service active in May and June. An early departure like this can help maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
You'll typically find the most flights from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) on a Friday, with around 52 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Southwest Airlines, Alaska Airlines, and Delta Air Lines. Flight options on Fridays are notably more than other days of the week.
What are the most popular departure times for flights from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
The most popular departure times for flights from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) are in the early morning, from 6am to 9am. About 24% of passengers prefer this time. Many major carriers, including Southwest Airlines, Alaska Airlines and United Airlines, offer flights during this window. This timing works well because you can get an early start to your travel day and arrive at your destination with plenty of time.
How long does it take to fly from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
Direct flights from PDX to ONT usually take about 2 hours 20 minutes, traveling roughly 839 miles. If you opt for a connecting flight, expect to add around 4 hours 30 minutes to your journey. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
Select the "Business class" and "First class" filters when looking for PDX to ONT flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight with Expedia?
It's easy to earn miles on a Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Ontario from Portland Intl. (PDX)?
If you're planning to travel to Ontario from Portland Intl. (PDX), you can fly directly into Los Angeles - Ontario Intl. (ONT) Some flights may connect through major hubs like Denver Intl. (DEN), Sacramento Intl. (SMF), Sky Harbor Intl. (PHX) before reaching Ontario. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) at the last minute?
Typically, booking a last minute flight from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight and hotel package?
Securing a Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.)?
If you booked your Portland, OR (PDX-Portland Intl.) to Ontario, CA (ONT-Los Angeles - Ontario Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Portland Intl.
Destination airport
Ontario Intl. Airport
Airlines serving
Alaska Airlines
Return price
£153
Distance
1342 km
Average flight time
2 hours 39 mins

Book with confidence

Compare flights from Portland to Ontario Intl. Airport easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Portland to Ontario Intl. Airport. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Ontario Intl. Airport in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Portland Intl. to Ontario Intl. Airport.  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Portland Intl. (PDX) to Ontario Intl. Airport (ONT)

The easiest way to view the best deals on flights from Portland to Ontario Intl. Airport today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Portland Intl. to Ontario Intl. Airport start at just £153 and range up to £279.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Portland and Ontario Intl. Airport
  • booking your flight during May, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Portland to Ontario Intl. Airport flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Portland Intl. to Ontario Intl. Airport for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Portland to Ontario Intl. Airport easily and book with confidence

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