AirHint found the following cheapest return flights from Waterloo (YKF) to San Francisco (SFO) in December 2025 (see full year).
Return flights
| 04 Dec - 12 Dec | WestJet | ||
| 12 Dec - 11 Jan | Flair Airlines | ||
| 04 Dec - 07 Dec | WestJet | ||
| 19 Dec - 26 Dec | Flair Airlines | ||
| 13 Dec - 19 Dec | WestJet | ||
| 27 Dec - 04 Jan | WestJet | ||
| 28 Dec - 02 Jan | Flair Airlines |
Also check the deals for one-way flights from Waterloo to San Francisco in December.
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