The cheapest times to fly from YKF to SEA are

  • January 8th to February 4th
  • May 7th to July 8th (except the week of June 25th)
  • September 3rd to December 9th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from YKF to SEA is mid October. Prices can be as high as $780 for Friday flights during late December, or as low as $535 for Tuesday flights around mid October.


When to Fly to Seattle

Flying from Kitchener (YKF) to Seattle, WA (SEA) will usually cost between $576 to $721 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid October with an average ticket price of $585. Due to high demand the most expensive time to fly is late December, with an average price of $715. Planning your trip to low-cost times can easily save you $131 on economy flights and even more on first-class flights. Generally, any price below $630 can be considered a good price for a round-trip YKF to SEA flight.

See below for a graph of average weekly prices for the YKF to SEA route. All prices are for round-trip tickets in USD.

YKF to SEA Flight Prices

Compared to other flights, the YKF to SEA flight is cheaper than the average and costs less than the average flight leaving from Waterloo. The average price per mile (for a direct flight) is $0.19, which is below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Fridays are the most expensive days to fly to Seattle, and Sundays are the most expensive days to return to Waterloo. Selecting flights on the least expensive days could save you up to $57 (8%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $614. Return trip prices are from the SEA to YKF flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from YKF to SEA can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 4 hour 38 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from YKF to SEA while comparing.

Destination alternative #1: Portland International Airport (PDX) in Portland, OR

  • 129 miles (208 km) away from SEA
  • Usually 13.11% less expensive than SEA
  • 1-layover flights available

See YKF to PDX flights


Flight Questions Answered

Still have questions about flying from YKF to SEA? We’ve got answers.

Which airlines fly this route?

You can find 6 major airlines flying this route most often: Alaska, American, Delta, Hainan, United, WestJet, and potentially more during busy seasons.

How far away is it from Seattle/Tacoma International Airport to Waterloo Airport?

The distance between the two airports is roughly 2026 miles or 3261 kilometers.

How long does it take to fly from YKF to SEA?

The real-world flight time for a nonstop YKF to SEA flight is about 4 hour 38 minutes.

How many flights go between Kitchener and Seattle, WA?

It depends on the day of the week and the date, but a typical day might have around 16 available flights from YKF to SEA.


Airport Location Info


Departing Airport

Origination code YKF
Origination airport name Waterloo Airport
City Kitchener
Country Canada
Latitude 43.5
Longitude -80.4

Return Airport

Destination code SEA
Destination airport name Seattle/Tacoma International Airport
City Seattle, WA
Country the United States
Latitude 47.5
Longitude -122.3


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.