AirHint found the following cheapest return flights from Waterloo (YKF) to San Francisco (SFO) in April 2026 (see full year).
Return flights
| 23 Apr - 09 May | WestJet | ||
| 09 Apr - 12 Apr | WestJet | ||
| 26 Apr - 02 May | Flair Airlines | ||
| 02 Apr - 05 Apr | WestJet |
Also check the deals for one-way flights from Waterloo to San Francisco in April.
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