$131 Cheap United flights Portland (PWM) to Ontario (ONT)

View $131 flight on Wed, Jan 21, 2026Opens in a new window

$131 Cheap United flights Portland (PWM) to Ontario (ONT)

Prices were available within the past 7 days and start at $131 for one-way flights and $286 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Jan 14 - Sun, Jan 18
PWM
Portland
ONT
Ontario
$286 Roundtrip, found 2 days ago
$286
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jan 14 from Portland to Ontario, returning Sun, Jan 18, priced at $286 found 2 days ago
United
Wed, Jan 14 - Sun, Jan 18
PWM
Portland
ONT
Ontario
$317 Roundtrip, found 2 days ago
$317
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jan 14 from Portland to Ontario, returning Sun, Jan 18, priced at $317 found 2 days ago
United
Wed, Jan 14 - Mon, Jan 19
PWM
Portland
ONT
Ontario
$318 Roundtrip, found 2 days ago
$318
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jan 14 from Portland to Ontario, returning Mon, Jan 19, priced at $318 found 2 days ago
United
Wed, Jan 14 - Sun, Jan 18
PWM
Portland
ONT
Ontario
$337 Roundtrip, found 2 days ago
$337
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jan 14 from Portland to Ontario, returning Sun, Jan 18, priced at $337 found 2 days ago
United
Wed, Jan 14 - Mon, Jan 19
PWM
Portland
ONT
Ontario
$348 Roundtrip, found 2 days ago
$348
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jan 14 from Portland to Ontario, returning Mon, Jan 19, priced at $348 found 2 days ago
United
Tue, Dec 9 - Sat, Jan 10
PWM
Portland
ONT
Ontario
$361 Roundtrip, found 23 hours ago
$361
Roundtrip
found 23 hours ago
Select United flight, departing Tue, Dec 9 from Portland to Ontario, returning Sat, Jan 10, priced at $361 found 23 hours ago

Frequently asked questions

How much is a United Airlines flight from Portland Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT)?
Finding cheap one-way United Airlines flights from PWM to ONT from $131 on Expedia couldn't be simpler — just filter by "Price (lowest to highest)." Or check out our affordable round-trip fares from $286 for your next exciting getaway.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from PWM to ONT with United Airlines?
January is one of the most affordable months to jet away to Ontario with United Airlines. You could also find great deals on return and one-way fares in April.
What is the cheapest time to book flights from Portland Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT) with United Airlines?
Look for affordable United Airlines flights from Portland Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT) one to three months ahead of your day of departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare type and journey, the best day to book a domestic flight is generally Sunday and the most expensive is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from Portland Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT)?
Use the "Nonstop" filter when browsing for direct United Airlines flights from PWM to ONT. You can also compare other airlines offering the same nonstop trip.
What is the earliest United Airlines flight from PWM to ONT?
Filter your results by "Morning" and "Early Morning" to browse the earliest flights from PWM to ONT. Jetting off early means you're less likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in Ontario?
Los Angeles - Ontario Intl. Airport (ONT) is the main Ontario gateway for United Airlines flights from Portland Intl. Jetport Airport (PWM).
Why fly with United Airlines from PWM to ONT?
Depart from PWM to ONT with United Airlines and you can look forward to a host of benefits including a rewarding loyalty program. When booking through Expedia as a United Mileage Plus and One Key™ member, you may also earn OneKeyCash™* to redeem on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my United Airlines flight from Portland Intl. Jetport Airport (PWM) to Los Angeles - Ontario Intl. Airport (ONT)?
In most cases, you can cancel or change your flight, although additional fees may apply if your booking was made over 24 hours ago. Need flexible options? Use our "No cancel fee" and "Changes included" filters to find flights that won't penalize you if you need to revise your plans. To update your itinerary, go to "Trips," select your flight and click on "Manage Booking" for more information.

Travel information

Origin airport
Portland Intl. Jetport
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, JetBlue Airways, Southwest Airlines, United
Popular airline
Southwest Airlines
Distance
2591 mi

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*Available to One Key members.