Cheapest return flights from Waterloo to Seattle in December from $910

AirHint found the following cheapest return flights from Waterloo (YKF) to Seattle (SEA) in December 2025 (see full year).

Return flights

23 Dec - 28 Dec WestJet
26 Dec - 28 Dec WestJet
18 Dec - 21 Dec WestJet
29 Dec - 04 Jan WestJet
22 Dec - 29 Dec WestJet
24 Dec - 27 Dec Flair Airlines
15 Dec - 22 Dec WestJet
28 Dec - 04 Jan Flair Airlines

Also check the deals for one-way flights from Waterloo to Seattle in December.

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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