$131 Cheap Flights from Portland (PWM) to Ontario (ONT)

View $131 flight on Tue, Jan 27, 2026Opens in a new window

Popular airlines from Portland Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT)

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Cheap Flights from Portland to Ontario (PWM-ONT)

Prices were available within the past 7 days and start at $131 for one-way flights and $279 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, Feb 5 - Wed, Feb 25
PWM
Portland
ONT
Ontario
$279 Roundtrip, found 5 days ago
$279
Roundtrip
found 5 days ago
Select Delta flight, departing Thu, Feb 5 from Portland to Ontario, returning Wed, Feb 25, priced at $279 found 5 days ago
American Airlines
Wed, Nov 19 - Sun, Nov 23
PWM
Portland
ONT
Ontario
$284 Roundtrip, found 5 days ago
$284
Roundtrip
found 5 days ago
Select American Airlines flight, departing Wed, Nov 19 from Portland to Ontario, returning Sun, Nov 23, priced at $284 found 5 days ago
Southwest Airlines
Thu, Feb 5 - Wed, Feb 25
PWM
Portland
ONT
Ontario
$289 Roundtrip, found 5 days ago
$289
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Thu, Feb 5 from Portland to Ontario, returning Wed, Feb 25, priced at $289 found 5 days ago
Southwest Airlines
Thu, Feb 5 - Wed, Feb 25
PWM
Portland
ONT
Ontario
$295 Roundtrip, found 5 days ago
$295
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Thu, Feb 5 from Portland to Ontario, returning Wed, Feb 25, priced at $295 found 5 days ago
United
Sat, Nov 22 - Wed, Nov 26
PWM
Portland
ONT
Ontario
$297 Roundtrip, found 1 day ago
$297
Roundtrip
found 1 day ago
Select United flight, departing Sat, Nov 22 from Portland to Ontario, returning Wed, Nov 26, priced at $297 found 1 day ago
Delta
Wed, Jan 7 - Thu, Jan 8
PWM
Portland
ONT
Ontario
$302 Roundtrip, found 1 day ago
$302
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Jan 7 from Portland to Ontario, returning Thu, Jan 8, priced at $302 found 1 day ago
Delta
Wed, Jan 14 - Thu, Jan 15
PWM
Portland
ONT
Ontario
$304 Roundtrip, found 3 days ago
$304
Roundtrip
found 3 days ago
Select Delta flight, departing Wed, Jan 14 from Portland to Ontario, returning Thu, Jan 15, priced at $304 found 3 days ago
American Airlines
Thu, Dec 4 - Mon, Dec 8
PWM
Portland
ONT
Ontario
$307 Roundtrip, found 2 days ago
$307
Roundtrip
found 2 days ago
Select American Airlines flight, departing Thu, Dec 4 from Portland to Ontario, returning Mon, Dec 8, priced at $307 found 2 days ago
Southwest Airlines
Wed, Feb 4 - Mon, Feb 9
PWM
Portland
ONT
Ontario
$307 Roundtrip, found 2 days ago
$307
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Wed, Feb 4 from Portland to Ontario, returning Mon, Feb 9, priced at $307 found 2 days ago
JetBlue Airways
Wed, Apr 29 - Fri, May 15
PWM
Portland
ONT
Ontario
$336 Roundtrip, found 5 days ago
$336
Roundtrip
found 5 days ago
Select JetBlue Airways flight, departing Wed, Apr 29 from Portland to Ontario, returning Fri, May 15, priced at $336 found 5 days ago

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

September is typically the cheapest month to fly

From $223 - $858 per traveler.

Alternative airports near Ontario

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

Select flight to John Wayne SNA. Average driving time to city center is 42 minutes. Flights from $477
SNA
John Wayne
Average driving time to city center42 min
Flights from $477

Frequently asked questions

How much does a flight from Portland Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Grab a cheap one-way flight from $131 or cheap return flight from $279 from Portland Intl. Jetport Airport (PWM) 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. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT)?
Traveling in February is a good way to save, as it's the cheapest month for flights between PWM and ONT. You'll often find the lowest prices during the off-season.
What is the cheapest airline that flies from Portland Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT)?
Use the filter tool on Expedia to compare different airlines and find the cheapest carrier that'll fly you from PWM to ONT. Then, sort your results by "Price (lowest to highest)" to pick up a great deal.
How many flights per day from Portland Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT)?
There aren't any daily direct flights departing from Portland Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT). But you can opt for flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be on your way in no time.
What day of the week has the most flights from PWM to ONT?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can change based on a number of factors, including the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Portland Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT)?
Book a flight from Portland Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT) that leaves before 3 PM to reduce the risk of cancellations. Later departures have a 22% higher chance of being canceled, on average.**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.
Is it cheaper to buy a plane ticket from Portland Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Waiting until just before your trip to book a ticket from PWM to ONT often results in higher prices. While you may find some last-minute deals, there's no guarantee. Keep your travel plans flexible to boost your chances of getting a bargain.
Is it cheaper to book a PWM to ONT flight and hotel package?
Opting for a PWM to ONT flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Pick from our extensive range of hotels and then add flights, car rentals and activities 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 Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT)?
If you booked your PWM to ONT flight in the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the ticket type you purchased, 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. Jetport
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$279
Distance
2591 mi

Book with confidence

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 February. 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 $131 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.

 

Portland to Ontario Flights

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*Available to One Key members.