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Ontario, CA to Seattle flights

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  • Cheap flights with over 660 airlines
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Cheapest flight Cheapest price for a one-way flight between Ontario, CA with Seattle found by our customers in the last 72 hours
Departing Airport The airport Ontario International is the departure airport operating flights between Ontario, CA and Seattle
Arriving Airport Flights departing Ontario, CA with Seattle as destination arrives at Seattle All Airports
High season According to search data from our customers, March is the busiest time to fly from Ontario, CA to Seattle

Cheap last minute flights to Seattle

Latest deals and top flight routes from Ontario, CA airports.

Departure Fri, 03 Jun Return Sun, 05 Jun
ONT Ontario, CA
SEA Seattle
return from £157
Departure Fri, 10 Jun Return Tue, 14 Jun
ONT Ontario, CA
SEA Seattle
return from £183
Flight route information
Find out further information on Ontario, CA and Seattle to help you prepare for your trip.
Ontario, CA airports
  • ( Los Angeles Intl Airport (LAX)
    How far from city centre: 44 miles
  • ( Ontario International (ONT)
    How far from city centre: 2 miles
Seattle airports
  • ( Seattle All Airports (SEA)
    How far from city centre: 11 miles
  • ( Lake Union Spb (LKE)
    How far from city centre: 7 miles
  • ( Boeing Field International (BFI)
    How far from city centre: 5 miles
  • ( Snohomish County (PAE)
    How far from city centre: 22 miles
K Distance: 967 miles

Search for flights from Ontario, CA to Seattle

Find cheap flights from Ontario, CA to Seattle with the Opodo search engine. Whether it’s on business, for a relaxing holiday or to visit loved ones, you will find all the best deals on flights from Ontario, CA with Opodo, featuring cheap flights by all the top low cost and standard airlines. By simply entering your preferences in our speedy search engine, a large selection of options will be returned from which you just need to select the best deal that works for you. We’ll do the rest! Alternatively, if you are flexible on dates or an early bird, discover the cheapest day to fly from Ontario, CA to Seattle to ensure you get the best price. Find exclusive discounts by downloading the Opodo App and subscribing to our newsletter to stay in touch with the best offers on flights, hotels and more. Finally, don’t forget to book a hotel or car hire to complete your journey, all of which you will find on Opodo, your one-stop travel shop. Then just sit back and relax and enjoy your holidays!

Frequent asked questions about flights from Ontario, CA to Seattle

😷 Is it safe to travel from Ontario, CA to Seattle during the Covid-19 situation?
At Opodo we want to make sure that your travel plans are not affected by any cancelation as well as any possible restrictions United States may apply when travelling from Ontario, CA. Is your flight cancelled? We've got your back! With our flexible ticket guarantee you can decide if you want to book another flight - free of rebooking fee - or get a full refund!
🔍 How can I find cheap flights from Ontario, CA to Seattle at Opodo?
The cheapest price for a flight from Ontario, CA to Seattle is 157£. At Opodo we use different machine learned based methodologies to find our costumers the best option available, considering airline combinations, stopovers and direct flights as well as different criteria for inbound and outbound journeys.
📉 When is the best time to book a flight from Ontario, CA to Seattle?
The most popular months to book a trip from Ontario, CA to Seattle are July, February and September, based on the searches of our customers.
📅 When is the best time to travel from Ontario, CA to Seattle?
The best time of the year to go to Seattle when flying from Ontario, CA depends on several preference factors like climate, seasonality and, of course, price. When it comes to popularity, March is the top 1º month to fly to Seattle from Ontario, CA in terms of searches from our customer, followed by July and August. If you prefer to avoid high peaks of turism, however, and escape a crowded period, April, October and November are the months with less volume of searchs for the route Ontario, CA -  Seattle.
🌡️ How is the weather in Seattle compared to Ontario, CA?
While in Ontario, CA the temperatures can reach an average of 36.7 ºC in summer, with precipitation levels up to 1.4 mm ,Seattle's temperatures can go up to 31.31 ºC during the hot season, with 9.0 mm average of rain rate . In winter, however, weather indicators show around -3.71 ºC in Seattle, compared to the -0.46 ºC average degrees reported in Ontario, CA. During the winter period, Ontario, CA can register 3.0 mm precipitation, while Seattle have an average of 12.0 mm rain level.
🛄 Which airports have flights between Ontario, CA and Seattle?
The main airport route flying between Ontario, CA and Seattle is: Ontario International (ONT) to Seattle All Airports (SEA). This route is covered by the following airline(s):
  • Alaska Airlines.
Which are the airlines with flights from Ontario, CA to Seattle?
Airlines with direct flights departing from Ontario, CA to Seattle are:
  • Alaska Airlines.
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