• Flights
  • Packages
  • Hotels
  • Cars
Round-trip
Coach

Refine your search by airline, by city or airport or direct flights

Bundle & Save

Your trip. Designed by our 24/7 travel experts

Enjoy personalized planning with real human support. Call Our Travel Experts 24/7. Call 1-646-738-4832 1-646-738-4832 and say DIAL10 to save.

Expires Jun 30, 2026. Where applicable discount applies to service fees for qualified airline tickets. Amount of service fee discount varies: maximum savings of $10 per person applied to bookings from one (1) traveler up to five (5) travelers; the maximum discount applied is $50. Promo Code and Instant Savings offers can be combined up to the amount of our service fees but cannot be used or combined with any other coupons, promotions or special offers. May be withdrawn at any time without notice. Promo code only applicable for bookings created over the phone through our call center.

What travelers love about OneTravel

20+ Years of ExperienceHelping 40M+ travelers worldwide Partnered with 1M+ verified hotels

24/7 Travel AdvisorsPersonalized planning and real human support, anytime

Upfront PricingOur prices include taxes and fees

Members Save MoreJoin ClubMiles rewards program and save on every booking

Round TripOne Way

What our customers say about our service?

Submit a review
  • Decent experienceMy experience with OneTravel was decent but could use some improvements. I found a good deal, but na vigating the site was a bit tricky at times. Thank....

    Read more

    Daniel Brown · Apr 22, 2026
  • Smooth Customer ServiceIt was a great experience using OneTravel to book my honeymoon trip to Bali. The customer service was outstanding, and they helped me with the best options for our budget. I appreciated their travel advice, and everything went smoothly. Would highly recommend!

    Read more

    Sophia Martinez · Apr 22, 2026
  • Prices are excellentI had a good experience with OneTravel, although there were a few hiccups during the booking process. Customer service was helpful in resolving my issues. The prices were excellent, and I found a great last-minute deal. The confirmation emails were timely, and I loved the easy access to my itinerary online.

    Read more

    Benjamin Roberts · Apr 22, 2026
  • A solid choiceI had a good experience with OneTravel while booking my family vacation. The price was right, and we could get seated together. The only issue I faced was with the payment processing, but their support team was quick to assist. Overall, a solid choice for travel planning.

    Read more

    Michael Harris · Apr 22, 2026

Seattle to Ontario Flight Route Information

Travel Distance:957 Miles
Airlines Flying This Route: Alaska Airlines, Southwest Airlines, Japan Airlines
Weekly Flights:40
Avg. Flight Duration:02.39 Hours

Insights About Flying from Seattle to Ontario

Q. Which is the high season to travel from Seattle to Ontario?
Ans. The month of November is considered the high season for flying from SEA to ONT. Traveling during the high season can affect ticket prices and availability, making this data crucial for trip planning.
Q. How many direct flights are available from SEA to ONT?

A. There are a total of 161 direct flights from Seattle to Ontario. For travelers seeking convenience and shorter travel times, this data is important when choosing flight options.

Q. Which is the low season to travel from Seattle to Ontario?

A. April is considered the low season for traveling from Seattle to Ontario, California. Travelers looking for cost-effective options and fewer crowds may consider traveling during this period.

Q. How many daily flights are there between Seattle to Ontario?

A. There are as many as 5 daily flights available for travelers between SEA to ONT. This data offers flexibility in choosing departure times that best suit your schedule.

Q. Which is the busiest day for passengers flying between Seattle to Ontario?

A. Monday are the busiest days for passengers flying between Seattle to Ontario. Knowing the peak travel day can help you plan your trip to avoid overcrowded flights or airports.

Q. At what time does the last flight depart to Ontario?

A. The last flight to Ontario typically departs between 9:00PM - 10:00PM. Travelers who prefer late-night departures will find this information valuable for planning their journey.

Q. What percentage of travelers spent an average of 3 days in Ontario, California?

A. Approximately 31.11% of travelers spent an average of 3 days exploring Ontario. This information can assist in planning the duration of your stay in Ontario

Q. What percentage of SEA to ONT flyers traveled with kids under 14?

A. About 6% of passengers on flights from Seattle to Ontario were accompanied by children under the age of 14. This information is useful if you're planning a family trip and want to know how common it is to travel with young children on this route.

Q. What percentage of Seattle to Ontario travelers were over 60 years old?

A. A notable 23% of travelers were aged 60 or older. This statistic provides insights for senior travelers or those seeking a mature travel demographic.

Q. What percentage of SEA to ONT travelers were millennials?

A. Millennials make up a significant portion of travelers on this route, accounting for 31% of all passengers. If you're a millennial looking to connect with like-minded travelers, this statistic might interest you.

Q. What percentage of Seattle to Ontario travelers were female?

A. Almost half of the passengers, approximately 58% were female. Knowing the gender distribution can be useful for solo female travelers or those interested in gender-related travel insights.

Q. What percent of Seattle to Ontario travellers booked first or business class?

A. 2% of travelers booked first or business class on this route.

Q. At what time the earliest flight departs from Seattle?

A. The earliest flight departs at 6:00AM - 7:00AM.

Q. Which is the most popular airport for connecting flights between Seattle to Ontario?

A. Oakland International Airport is the most popular airport for connecting flights between SEA to ONT.

Q. On which days one can have the most flight options in Ontario?

A. Monday offer the most flight options in Ontario.

§ All flight facts are based on last 3 months' data except the highest and lowest booking months that are based on last 3 months' data.
Recent posts View all posts
Travel Easy India: Your Guide to a Stress-Free Journey
Read more
Travel Easy China: Your Guide to a Stress-Free Trip
Read more
Travel Easy Vietnam: Your Guide to a Stress-Free Trip
Read more
Travel Easy Philippines: Your Guide to a Stress-Free Trip  
Read more
Global Greens: Top Destinations for Vegetarian Travelers
Read more
View all posts

Cheap Flights from Seattle to Ontario

Book your flights from Seattle to Ontario. Better known as the capital city of Ottawa, Ontario serenades vacationers from all over. It is the most populous and second-largest province of Canada. While in the city, do check out the CN Tower and Wasaga Beach. To reach Ontario from Seattle, you can choose from top airlines that includes US Airways and United Airlines. Take advantage of great deals on flights to Ontario and save to splurge on a vacation. Your flight to Ontario from Seattle takes around four hours thirty minutes to cover the distance of 957 miles, this excludes the layover time. While in the aircraft, listen to music to pass the time.