Cheapest return flights from Waterloo to Seattle in May from $252

AirHint found the following cheapest return flights from Waterloo (YKF) to Seattle (SEA) in May 2026 (see full year).

Return flights

10 May - 12 May WestJet
08 May - 11 May WestJet
08 May - 10 May WestJet
02 May - 10 May WestJet
04 May - 18 May WestJet
21 May - 25 May WestJet
01 May - 31 May WestJet
28 May - 31 May WestJet
14 May - 18 May WestJet
30 May - 13 Jun WestJet

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

Powered by

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.

Book a cheap hotel in Seattle

Cheap car rent in Seattle

Feel free to contact us with any feedback or request another flight research.