* All fares below were last found on: Aug 13, 2018 and 8:03:53 PM.
Fares are round trip, Fares incl. all fuel surcharges, our service fees and taxes.
Displayed fares are based on historical data, are subject to change and cannot be guaranteed at the time of booking.
See all booking terms and conditions
Find the deals you want & manage your trips ... all while on the go.
Earn rewards points & other travel perks when you spend.
Get inspired, learn expert tips & add to your travel bucket list.
Love Burgers? Here’s 4 Regional Hamburger Chains You NEED to Try!
Four Fantastic Flower Festivals Across the US
Sun’s Out, Fun’s Out! 8 Weekend Getaways to Perk Up Your Summer
Eat Your Heart Out! The Best Cities in the US to Take a Foodie Getaway
How to Find Yourself in the Quiet: The Power of a Silent Retreat
Save BIG on flights from Philadelphia (PHL) to Portland (PDX)! Find affordable deals airfares to Portland, OR and take off to the cinematic and sensational Portland, all within your budget!
If you are looking forward to a laidback vacation, Ontario is an excellent choice. Romantic, laidback and full of fun, Ontario offers its guest to indulge in a vacation like none. Whether its sightseeing, beautiful outdoors, mouthwatering cuisine, shopping or nightlife, Ontario California has it all. Grab cheap Ontario flights on OneTravel and save more on your airline tickets. We offer exclusive deals on airlines flying to Ontario including American Airlines, Alaska Airlines and Virgin America. The average flight time from Seattle, WA to Ontario, CA is around two hours and thirty minutes.