AirHint found the following cheapest return flights from Sandefjord (TRF) to Keflavik (KEF) in September 2025 (see full year).

Return flights

18 Sep - 24 Sep	Wizz Air
18 Sep - 21 Sep	Wizz Air
23 Sep - 02 Oct	Ryanair
28 Sep - 08 Oct	Wizz Air
30 Sep - 09 Oct	Ryanair
24 Sep - 30 Sep	Wizz Air
18 Sep - 22 Sep	Wizz Air
09 Sep - 11 Sep	Ryanair
26 Sep - 02 Oct	Ryanair
19 Sep - 21 Sep	Ryanair
09 Sep - 16 Sep	Ryanair
06 Sep - 10 Sep	Ryanair
20 Sep - 23 Sep	Ryanair
20 Sep - 27 Sep	Ryanair
30 Sep - 06 Oct	Ryanair
30 Sep - 10 Oct	Ryanair
25 Sep - 03 Oct	Wizz Air
26 Sep - 03 Oct	Ryanair
26 Sep - 05 Oct	Scandinavian Airlines
22 Sep - 09 Oct	Lufthansa

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

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 Sandefjord to Keflavik in September from $154

Return flights