$99 Cheap Delta flights Portland (PDX) to Ontario (ONT)

Grab cheap round-trip Delta Air Lines flights from $197 from PDX to ONT by filtering your results from “Price (lowest to highest)” on Expedia. Or look for options from $99 for a one-way trip.**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.

Search for return or one-way flights to Ontario in January or April. You could find an affordable fare with Delta Air Lines during these quieter months.

Start searching one to three months ahead of your departure date to find cheaper fares on Delta Air Lines flights from Portland Intl. Airport (PDX) to Los Angeles - Ontario Intl. Airport (ONT). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also cut costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing right, and you can enjoy significant savings on domestic journeys.*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.

Click on the “Nonstop” filter when searching for direct Delta Air Lines flights from PDX to ONT. It’s also a good way to compare other carriers servicing the same nonstop trip.

Browse Delta Air Lines’s earliest flights from PDX to ONT by selecting the “Early Morning” and “Morning” filters. Not only will you get to where you’re going sooner, early departures also have a 20% less chance of being canceled.**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.

Delta Air Lines flights from Portland Intl. Airport (PDX) to Ontario come in to land at Los Angeles - Ontario Intl. Airport (ONT). This is the main entry point to this city.

Delta Air Lines makes traveling from PDX to ONT more comfortable with an excellent in-flight experience and a rewarding loyalty program. You also have the chance to earn points with Delta SkyMiles. Make sure you sign up to our free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on the ticket type you purchased, a fee generally applies if you modify or cancel your booking more than 24 hours after it’s been confirmed. To find plane tickets with more flexibility, select our “Changes included” or “No cancel fee” filter while looking for flights. For more details on modifying or canceling your reservation, head to “Trips,” select your flight and tick “Manage Booking.”