Cheap Flights from Kitchener / Waterloo (YKF) to Seattle (SEAA)

Compare Kitchener / Waterloo to Seattle flight deals

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Flight deals from Kitchener / Waterloo to Seattle

Looking for a cheap last-minute deal or the best return flight from Kitchener / Waterloo Airport to Seattle? If you want to travel next month, return fares start from £184. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Kitchener / Waterloo to Seattle

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

Toronto to Seattle: Flight information

The things to know before you go.
Cheapest flight found£98
Cheapest month to flyJune

Finding cheap flights from Kitchener / Waterloo to Seattle: Frequently asked questions

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a return flight from Kitchener / Waterloo to Seattle is £172. 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.
Currently, there are no airlines that fly direct from Kitchener / Waterloo to Seattle. But we found flights with one or more stops from £172.
As of April 2026, there are no flights flying from Kitchener / Waterloo to Seattle.
The cheapest month to fly from Kitchener / Waterloo to Seattle is usually June.
If you're flying from Kitchener / Waterloo Airport, the cheapest airport near Seattle is Seattle / Tacoma International – which is 12.1 miles away from the centre of Seattle. We've found flights into this airport from £172.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Kitchener / Waterloo Airport to Seattle on Thursday, 11 June 2026.
No airlines currently offer direct flights between Kitchener / Waterloo Airport and Seattle. Most routes have one or more stops.
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 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.
In April, the average temperature is usually around 8°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.
Currently, WestJet offers the cheapest flight tickets to Seattle.

Flying from Region of Waterloo International Airport (YKF) to Seattle: what you need to know

  • Region of Waterloo International Airport is located in Toronto. Based in the UTC-7 timezone, Seattle is three hours behind Toronto.

  • To avoid rushing for your YKF to Seattle flight, allow plenty of time for things like baggage drop and finding your gate. Turning up two hours ahead of international departures and an hour before domestic flights is the standard rule.

  • Travelling during a peak time like August? Public holidays and other popular periods can lead to longer queues and delays at security. Play things extra safe and arrive up to four hours before international flights and two hours before a domestic departure.

  • YKF is about 80 kms (50 miles) from central Toronto. If you're ride-sharing, driving or catching a cab from the centre, it'll take you 1 hour 15 minutes or so to get there, depending on the traffic. If you're taking public transport, expect the journey time to be around 4 hours 5 minutes.

  • Want an easy start to your trip? Stay near YKF. Whether you're catching an early flight from Region of Waterloo International Airport to Seattle or don't want departure day to feel hectic, these hotels are all about convenience:

  • 63.64% of flights departing from Region of Waterloo International Airport make it to their destination on schedule.

How to find the cheapest flights from Region of Waterloo International Airport (YKF) to Seattle

  • £99 is currently the best price for a one-way Region of Waterloo International Airport to Seattle flight. A return plane ticket starts at £172. These fares can change based on availability and demand.

  • Booking early is often the key to scoring a cheap flight from YKF to Seattle. Fares tend to rise as demand increases, so the closer you get to departure, the more it could cost you.

  • The 'Whole month' tool will show you the cheapest tickets from Region of Waterloo International Airport to Seattle across the month. It's a great way to find a bargain if your travel plans are flexible.

  • You don't need to check in daily to find out if fares have dropped when you set up a Price Alert. We'll let you know the moment there's an extra saving on cheap flights from YKF to Seattle.

  • Pick your ideal departure and arrival times, airlines and number of stops with our filters. Then, sort the results for your flight from Region of Waterloo International Airport to Seattle by 'Best,' 'Cheapest' or 'Fastest.'

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) to the centre of Seattle takes about 20 minutes to reach by car. The centre is roughly 23 kms (14 miles) away.

  • If you're using public transport, expect a journey time of about 55 minutes.

  • Book a hotel near SEA if you're coming in on a late flight from Region of Waterloo International Airport to Seattle. Select one of these options and make your first night all about rest:

  • Grab a Seattle-Tacoma International Airport rental car and explore Seattle and beyond with your own set of wheels. Thrifty, Europcar and Budget are popular providers to choose from here.

  • Reserving your ride from Seattle-Tacoma International Airport about one week before your flight from YKF to Seattle can help you get the best possible rate.

Lake Union Sea Plane Base Airport (LKE)

  • Once your flight from Region of Waterloo International Airport to Seattle has arrived, you can make your way to the city centre in around 10 minutes by car. Central Seattle is roughly 3 kms (2 miles) from Lake Union Sea Plane Base Airport (LKE).

  • Travelling by public transport will take around 25 minutes.

  • Following your YKF to Seattle flight, unwind at a hotel near LKE. These are some comfortable accommodation options that'll help you slip into relaxation mode:

Best time to go to Seattle

  • Carefully consider your dates before booking your flight from Region of Waterloo International Airport to Seattle. The city comes alive during peak season, but hotel rates are generally higher and attractions can get crowded. Plan your trip to Seattle in the off-season if you prefer a quieter vibe.

  • Before booking a Region of Waterloo International Airport to Seattle plane ticket, think about what kind of weather works for you. August is the warmest month in Seattle, with temperatures ranging from 12ºC (54ºF) to 28ºC (82ºF).

  • If you like travelling in cooler conditions, search for a cheap ticket from YKF to Seattle in February when temperatures average between -1ºC (30ºF) and 11ºC (52ºF).

More about Seattle

  • Start your Seattle trip right by choosing the ideal place to stay. Once you've booked your flight from Region of Waterloo International Airport to Seattle, browse our selection of hotels including:

  • There are so many things to discover in this city it can be hard to figure out where to begin. LMN Architects, Greyhound: Bus Station and Boeing Radiation Effects Lab are highlights which should be on any good Seattle itinerary.

Explore more of United States

  • You've seen Seattle, now it's time to explore more of United States. Travel about 241 kms (150 miles) south to Portland to tick off its leading attractions. From Pioneer Courthouse Square to Portland Japanese Garden and Pittock Mansion, your itinerary will be busy.

  • Spokane is another sought-after destination in United States and is around 370 kms (230 miles) east of Seattle. No trip is complete without dropping by Manito Park, Northwest Museum of Arts & Culture and Spokane Falls.

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