There isn’t much competition on routes from Seattle up to the San Juan Islands. Kenmore Air is the only operator flying floatplanes from South Lake Union and Lake Washington, along with connecting service from all over the Puget Sound. It’s a small, privately held airline based in Seattle that operates a fleet of around 25 planes, flying to harder-to-reach locales in the Pacific Northwest.
I booked this flight to depart from South Lake Union, right in downtown Seattle, to West Sound Marina directly through Kenmore Air’s website using my Platinum Card from American Express, which earned me 5x points. The flight cost $159 flat, so I ended up earning 795 Membership Rewards points — worth about $15.