Cheapest return AUS–KEF flights, September

AirHint found the following cheapest return flights from Austin (AUS) to Keflavik (KEF) in September 2026 (see full year).

Return flights

08 Sep - 14 Sep Spirit Airlines
01 Sep - 08 Sep Spirit Airlines
02 Sep - 09 Sep Spirit Airlines
07 Sep - 15 Sep Spirit Airlines
10 Sep - 17 Sep Spirit Airlines
25 Sep - 02 Oct jetBlue
06 Sep - 12 Sep Spirit Airlines
09 Sep - 16 Sep jetBlue
26 Sep - 03 Oct jetBlue
23 Sep - 30 Sep jetBlue
24 Sep - 01 Oct Alaska Airlines
17 Sep - 24 Sep Scandinavian Airlines

Also check the deals for one-way flights from Austin to Keflavik in September.

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