$84 Cheap Flights from Portland (PDX) to Ontario (ONT)

View $84 flight on Tue, Aug 5, 2025Opens 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 to Ontario (PDX-ONT)

Prices were available within the past 7 days and start at $84 for one-way flights and $146 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Aug 7 - Sun, Aug 10
PDX
Portland
ONT
Ontario
$146 Roundtrip, just found
$146
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Aug 7 from Portland to Ontario, returning Sun, Aug 10, priced at $146 just found
Southwest Airlines
Tue, Oct 21 - Sat, Oct 25
PDX
Portland
ONT
Ontario
$149 Roundtrip, found 3 days ago
$149
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Tue, Oct 21 from Portland to Ontario, returning Sat, Oct 25, priced at $149 found 3 days ago
Frontier Airlines
Fri, Aug 15 - Sun, Aug 17
PDX
Portland
ONT
Ontario
$156 Roundtrip, just found
$156
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Aug 15 from Portland to Ontario, returning Sun, Aug 17, priced at $156 just found
United
Sat, Nov 1 - Wed, Nov 5
PDX
Portland
ONT
Ontario
$159 Roundtrip, just found
$159
Roundtrip
just found
Select United flight, departing Sat, Nov 1 from Portland to Ontario, returning Wed, Nov 5, priced at $159 just found
Frontier Airlines
Fri, Aug 8 - Mon, Aug 11
PDX
Portland
ONT
Ontario
$159 Roundtrip, found 2 hours ago
$159
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Fri, Aug 8 from Portland to Ontario, returning Mon, Aug 11, priced at $159 found 2 hours ago
Frontier Airlines
Thu, Jul 24 - Sun, Jul 27
PDX
Portland
ONT
Ontario
$160 Roundtrip, found 1 hour ago
$160
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Thu, Jul 24 from Portland to Ontario, returning Sun, Jul 27, priced at $160 found 1 hour ago
Frontier Airlines
Sat, Aug 2 - Mon, Aug 4
PDX
Portland
ONT
Ontario
$164 Roundtrip, found 1 hour ago
$164
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sat, Aug 2 from Portland to Ontario, returning Mon, Aug 4, priced at $164 found 1 hour ago
Frontier Airlines
Sat, Aug 9 - Sat, Aug 16
PDX
Portland
ONT
Ontario
$166 Roundtrip, just found
$166
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Aug 9 from Portland to Ontario, returning Sat, Aug 16, priced at $166 just found
Hawaiian Airlines
Tue, Oct 7 - Tue, Oct 21
PDX
Portland
ONT
Ontario
$177 Roundtrip, found 6 hours ago
$177
Roundtrip
found 6 hours ago
Select Hawaiian Airlines flight, departing Tue, Oct 7 from Portland to Ontario, returning Tue, Oct 21, priced at $177 found 6 hours ago
Delta
Wed, Dec 10 - Mon, Dec 15
PDX
Portland
ONT
Ontario
$197 Roundtrip, just found
$197
Roundtrip
just found
Select Delta flight, departing Wed, Dec 10 from Portland to Ontario, returning Mon, Dec 15, priced at $197 just found

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

September is typically the cheapest month to fly

From $48 - $151 per traveler.

Graph displaying average flight prices per month

Flights from Portland (PDX) to Ontario (ONT)
Origin airport
Portland Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$146
Distance
838 mi
Average flight time
2 hours 20 mins

Portland to Ontario Flights

The cheapest times to fly from Portland to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Portland to Ontario are during the month of August. You can find some of the cheapest flights from Portland to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Portland to Ontario

Sunday is one of the best days to book for cheap flights from Portland to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Portland to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Portland to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $84 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Portland to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Portland to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Cheap return flights from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT) start from $109. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Frontier Airlines flight leaving PDX on July 31 2025 and touching down at ONT. The price was last updated on July 9 2025 and has not changed since.
What is the cheapest month to fly from PDX to ONT?
The cheapest flights from PDX to ONT are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT)?
When departing from Portland Intl. Airport (PDX), you can board a direct flight to Los Angeles - Ontario Intl. Airport (ONT) with Alaska Airlines.
What is the cheapest airline that flies from PDX to ONT?
With prices as low as $64 for a one-way flight from PDX to ONT, Frontier Airlines is currently the cheapest airline operating this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from PDX on October 3 2025. Prices were last updated on July 9 2025 and have not changed since.
How many flights per day from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT)?
Daily, an average of 2 nonstop flights operate from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT). Choose the departure time that best suits your travel plans.
What are the most popular departure times for flights from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT)?
More passengers fly between PDX and ONT at 8 AM than at any other time. Looking to skip the crowds? Travel outside of rush hours and it's possible you'll save on your ticket as well.
What day of the week has the most flights from PDX to ONT?
If you depart on a Friday, you'll get the widest range of options for flights from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT).
What is the earliest flight from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT)?
Portland Intl. Airport (PDX)'s first flight to Los Angeles - Ontario Intl. Airport (ONT) takes off at approximately 8:13AM UTC-8. With a travel time of 2h 21m, you'll land at around 10:34AM UTC-8.
How long does it take to fly from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT)?
The average flight time from PDX to ONT is 2 hours and 19 minutes, covering a total distance of 840 mi.
What airline has the least delays from PDX to ONT?
Consider traveling with Alaska Airlines if you'd like to go straight from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT) without any holdups. This airline has the strongest track record for punctuality, with an on-time score of 87%. Want to be updated if anything changes? You can keep an eye on your flight status using the Expedia App.
What is the best time to fly from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT)?
To arrive at Los Angeles - Ontario Intl. Airport (ONT) without delays, book a flight that leaves Portland Intl. Airport (PDX) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Ontario from Portland Intl. Airport (PDX)?
Catch a direct flight from Portland Intl. Airport (PDX) to Ontario and touch down at one of these airports:

  • Los Angeles Intl. Airport (LAX)
  • John Wayne Airport (SNA)
  • Los Angeles - Ontario Intl. Airport (ONT)

Is it cheaper to buy a plane ticket from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Booking your ticket from PDX to ONT just before your journey is typically more expensive. But if you're flexible with your travel dates and times, you could score a cheap last-minute fare.
Is it cheaper to book a PDX to ONT flight and hotel package?
Compared with arranging hotels and flights separately, booking a PDX to ONT flight and hotel package with Expedia could result in significant savings. Better yet, having it all in one place takes the hassle out of planning your trip. Just secure your flights and choose from our extensive range of stays, then customize your trip with other add-ons like car rentals and activities.
Can I cancel or change the date of my flight from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT)?
In most instances, you can cancel or modify your PDX to ONT flight. However, additional charges may apply, especially if you made your booking more than 24 hours ago. Double-check your itinerary for the airline's guidelines and fees on flight changes, or if you want further details, go to our Customer Service portal.

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