AirHint found the following cheapest one-way flights from Seattle (SEA) to Vancouver (YVR) in September 2026 (see full year).
One-Way flights
| 16 Sep | WestJet | direct | |
| 12 Sep | WestJet | direct | |
| 23 Sep | WestJet | direct | |
| 14 Sep | Air Canada | direct | |
| 06 Sep | Air Canada | direct | |
| 17 Sep | Harbour Air | direct |
Also check the deals for return flights from Seattle to Vancouver in September.
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