San Francisco (SFO) ⇄ Seattle (SEA)

4 occurrences on flights between San Francisco International Airport and Seattle–Tacoma International Airport, as the departure and destination were reported for the first aircraft involved.

Reported airports are matched to an airport only when the match is unambiguous, so flights whose airports were recorded loosely are not counted here. Records hidden on the map by default (minor, with little written about them) are included.