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

Return flights

04 May - 12 May	Delta
12 May - 19 May	KLM
13 May - 20 May	KLM
10 May - 17 May	Delta
11 May - 18 May	Air France
09 May - 17 May	Air France
09 May - 16 May	Delta
26 May - 02 Jun	Spirit Airlines
14 May - 21 May	United
19 May - 24 May	Spirit Airlines
22 May - 29 May	Spirit Airlines
27 May - 03 Jun	Spirit Airlines
25 May - 01 Jun	Spirit Airlines
28 May - 05 Jun	United

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

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik

Cheapest return flights from Austin to Keflavik in May from $504

Return flights