AirHint found the following cheapest return flights from Waterloo (YKF) to San Francisco (SFO) in May 2026 (see full year).
Return flights
| 05 May - 12 May | WestJet | ||
| 14 May - 18 May | WestJet | ||
| 05 May - 10 May | WestJet |
Also check the deals for one-way flights from Waterloo to San Francisco in May.
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