$48 Cheap Flights from Portland (PDX) to Ontario (ONT)

View $48 flight on Mon, Nov 10, 2025Opens in a new window

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

Cheap Flights from Portland to Ontario (PDX-ONT)

Prices were available within the past 7 days and start at $48 for one-way flights and $102 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Fri, Nov 14 - Sun, Nov 16
PDX
Portland
ONT
Ontario
$102 Roundtrip, found 1 hour ago
$102
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Fri, Nov 14 from Portland to Ontario, returning Sun, Nov 16, priced at $102 found 1 hour ago
Frontier Airlines
Mon, Nov 3 - Mon, Nov 10
PDX
Portland
ONT
Ontario
$108 Roundtrip, found 3 hours ago
$108
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Mon, Nov 3 from Portland to Ontario, returning Mon, Nov 10, priced at $108 found 3 hours ago
Frontier Airlines
Tue, Dec 30 - Thu, Jan 1
PDX
Portland
ONT
Ontario
$111 Roundtrip, found 18 hours ago
$111
Roundtrip
found 18 hours ago
Select Frontier Airlines flight, departing Tue, Dec 30 from Portland to Ontario, returning Thu, Jan 1, priced at $111 found 18 hours ago
Frontier Airlines
Fri, Nov 14 - Mon, Nov 17
PDX
Portland
ONT
Ontario
$112 Roundtrip, just found
$112
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Nov 14 from Portland to Ontario, returning Mon, Nov 17, priced at $112 just found
Frontier Airlines
Mon, Nov 10 - Sun, Nov 16
PDX
Portland
ONT
Ontario
$113 Roundtrip, found 9 hours ago
$113
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Mon, Nov 10 from Portland to Ontario, returning Sun, Nov 16, priced at $113 found 9 hours ago
Frontier Airlines
Mon, Nov 3 - Sun, Nov 9
PDX
Portland
ONT
Ontario
$118 Roundtrip, found 2 hours ago
$118
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Mon, Nov 3 from Portland to Ontario, returning Sun, Nov 9, priced at $118 found 2 hours ago
Southwest Airlines
Sat, Dec 13 - Tue, Dec 23
PDX
Portland
ONT
Ontario
$122 Roundtrip, just found
$122
Roundtrip
just found
Select Southwest Airlines flight, departing Sat, Dec 13 from Portland to Ontario, returning Tue, Dec 23, priced at $122 just found
Delta
Sat, Nov 8 - Mon, Nov 10
PDX
Portland
ONT
Ontario
$127 Roundtrip, found 1 hour ago
$127
Roundtrip
found 1 hour ago
Select Delta flight, departing Sat, Nov 8 from Portland to Ontario, returning Mon, Nov 10, priced at $127 found 1 hour ago
Alaska Airlines
Sat, Dec 13 - Tue, Dec 23
PDX
Portland
ONT
Ontario
$137 Roundtrip, just found
$137
Roundtrip
just found
Select Alaska Airlines flight, departing Sat, Dec 13 from Portland to Ontario, returning Tue, Dec 23, priced at $137 just found
United
Wed, Nov 19 - Sun, Nov 23
PDX
Portland
ONT
Ontario
$140 Roundtrip, found 4 hours ago
$140
Roundtrip
found 4 hours ago
Select United flight, departing Wed, Nov 19 from Portland to Ontario, returning Sun, Nov 23, priced at $140 found 4 hours ago

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

October is typically the cheapest month to fly

From $77 - $212 per traveler.

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Los Angeles - Ontario Intl. ONT. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from $235
ONT
Los Angeles - Ontario Intl.
CheapestClosest
Average driving time to city center8 min
Flights from $235
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
$102
Distance
838 mi
Average flight time
2 hours 33 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 November. 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 $48 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?
Grab a cheap one-way flight from $48 or cheap return flight from $102 from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT)?
November is the least expensive month to fly from PDX to ONT. Traveling outside of peak seasons is often the key to finding better deals on flights.
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 Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT)?
The cheapest airline to offer flights between Portland Intl. Airport (PDX) and Los Angeles - Ontario Intl. Airport (ONT) can vary based on your travel plans. Frontier Airlines and Alaska Airlines are just some of the choices offering well-priced fares. Use Expedia's filters to compare airlines in one place and find the right PDX to ONT flight for your budget.
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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*Available to One Key members.