Cheap Flights from Ontario International to Seattle / Tacoma International

Compare Ontario International to Seattle / Tacoma International flight deals

Find the cheapest month or even day of the year to fly to Seattle / Tacoma International

Book the best Seattle / Tacoma International fare with no extra fees

Flight deals from Ontario International to Seattle / Tacoma International

Looking for a cheap last-minute deal or the best return flight from Ontario International to Seattle / Tacoma International? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Ontario International to Seattle / Tacoma International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Seattle / Tacoma International flights are currently cheapest in November.

Direct flights from Ontario International to Seattle / Tacoma International

Ontario International to Seattle / Tacoma International: Alternative routes

Compare routes from Ontario International to Seattle below. You may find an airport to fly into that's cheaper, faster, or easier than Seattle / Tacoma International.

Ontario to Seattle: Flight information

The things to know before you go.
Cheapest flight found$97
Cheapest month to flyNovember
Average flight time2 hrs, 56 mins
Most popular airlineWestJet
Average flights per week167

Finding cheap flights from Ontario International to Seattle / Tacoma International: Frequently asked questions

The best price we found for a return flight from Ontario International to Seattle / Tacoma International is $97. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
2 hours and 56 minutes is the average flight time from Ontario International to Seattle / Tacoma International.
WestJet, Hawaiian Airlines and Alaska Airlines fly direct from Ontario International to Seattle / Tacoma International.
As of October 2024, there are 167 flights per week flying from Ontario International to Seattle / Tacoma International.
The cheapest month to fly from Ontario International to Seattle / Tacoma International is usually October 2024.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Seattle / Tacoma International Airport on Thursday, 21 November 2024.
Yes – the average flight time is 2 hours and 56 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle / Tacoma International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Frontier Airlines offers the cheapest flight tickets to Seattle / Tacoma International.

Travelling from Ontario International Airport (ONT) to Seattle-Tacoma International Airport (SEA): what you need to know

  • Expect to be in the air for around 2 hours 46 minutes. That's the average time for a direct flight from Ontario International Airport to Seattle-Tacoma International Airport. Seattle and Ontario share the same timezone (UTC-7).

  • Choose from 67 weekly flights from Ontario International Airport to Seattle-Tacoma International Airport. The 06:00 departure with Alaska Airlines is the earliest you can take between ONT and SEA. Alaska Airlines operates the latest service of the day at 21:31 if early starts aren't your thing.

  • Heading away during a peak period like public or school holidays? Expect longer queues at security and check-in. To play it safe, arrive up to four hours before international flights and two hours before domestic departures.

  • We make it a piece of cake to book a flight with a stopover. To see your options for flights from Ontario International Airport to Seattle-Tacoma International Airport, deselect 'Direct flights only.' Then, pick a flight that has a stop long enough to explore the city of your choice. Some popular stopovers between ONT and SEA include:

    • Metropolitan Oakland International Airport

    • Portland International Airport

    • Sacramento International Airport

How to find the cheapest flights from Ontario International Airport (ONT) to Seattle-Tacoma International Airport (SEA)

  • The lowest price we've seen for a one-way ticket from Ontario International Airport to Seattle-Tacoma International Airport is $49. For a return flight on this route, the best price is $97. Depending on the availability and when you book, these fares can change.

  • Score flight tickets from ONT to SEA by booking at least 9 months ahead. According to our research, that's the sweet spot for landing a bargain.

  • Plan your trip for May. That's the cheapest month for tickets from Ontario International Airport to Seattle-Tacoma International Airport. If you're flexible with your travel dates, use the 'Whole month' tool to see the lowest price across every month.

  • Finding a cheap ticket from ONT to SEA is a breeze with Price Alerts. Simply set up one of these automatic alerts and we'll let you know when there's a better deal.

  • Use filters to tailor your flights from Ontario International Airport to Seattle-Tacoma International Airport. Simply enter your ideal departure and arrival times, number of stops and airlines. Alternatively, sort your results by 'Cheapest' to see the best deals.

Handy information about Ontario International Airport (ONT)

Arriving at Seattle-Tacoma International Airport (SEA)

Getting from Seattle-Tacoma International Airport (SEA) to central Seattle

  • Seattle-Tacoma International Airport is approximately 23 kilometres from the centre of Seattle. With your own car rental or if you take a cab, the drive is around 18 minutes.

  • Getting there by public transport will take you roughly 54 minutes.

When to fly to Seattle-Tacoma International Airport (SEA)

  • It's time to pick your trip dates for your flight from Ontario International Airport to Seattle-Tacoma International Airport. July is the most popular month to visit Seattle. If you want a more relaxed vibe, go in May.

  • When reserving your flight from Ontario International Airport to Seattle-Tacoma International Airport, consider the type of weather you enjoy. August is the warmest month in Seattle, with temperatures ranging from 12 ºC to 28 ºC.

  • February sees average temperatures of between -1 ºC and 11 ºC. Search for flight tickets from ONT to SEA sometime around then if you like cooler conditions.

More about Seattle

  • Once you've locked in your flights from ONT to SEA, you'll need to find a hotel in Seattle. Make one of these accommodation options your base for exploring this exciting destination:

  • There are so many things to discover in this city it can be tricky to know where to begin. Picardo Farm P-Patch Community Garden, Elliott Bay Waterfront and LMN Architects are top sights which should feature on any good Seattle itinerary.

Complete your Seattle trip with hotels and a car rental

  • You've booked a cheap ticket to Seattle-Tacoma International Airport — next up is finding somewhere to stay, and maybe even your own set of wheels. We've compared prices across hundreds of companies to bring you the best hotels and car rental deals in Seattle.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.