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

Finding cheap one-way Delta Air Lines flights from ONT to PDX from $99 on Expedia is easy — just filter by “Price (lowest to highest).” Or check out our budget-friendly return fares from $197 for your next 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.

Browse for round-trip or one-way flights to Portland in January or December. You could find an affordable fare with Delta Air Lines during these off-season months.

Search for affordable Delta Air Lines flights from Los Angeles - Ontario Intl. Airport (ONT) to Portland Intl. Airport (PDX) one to three months ahead of your departure day. 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. No matter the fare class and itinerary, the best day to book a domestic flight is usually Sunday and the most expensive is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book 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.

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

Find Delta Air Lines’s earliest flights from ONT to PDX by checking our “Early Morning” and “Morning” filters. Not only will you get to your destination sooner, early departures also experience 20% fewer 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.

Portland Intl. Airport (PDX) is the main Portland hub for Delta Air Lines flights from Los Angeles - Ontario Intl. Airport (ONT).

Delta Air Lines makes traveling from ONT to PDX more enjoyable with a rewarding loyalty program and an excellent in-flight experience. You could even start collecting 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 bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are generally free within 24 hours of making a booking, but your airline may charge you after that time. For more information about modifying your flights, head to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the freedom to update your itinerary without being charged, check the “No cancel fee” or “Changes included” filter when organizing your next getaway.