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

Return flights

10 Sep - 17 Sep	Wizz Air
18 Sep - 24 Sep	Wizz Air
30 Sep - 02 Oct	Ryanair
25 Sep - 02 Oct	Wizz Air
16 Sep - 17 Sep	Wizz Air
30 Sep - 07 Oct	Wizz Air
11 Sep - 20 Sep	Wizz Air
04 Sep - 06 Sep	Wizz Air
21 Sep - 25 Sep	Wizz Air
09 Sep - 17 Sep	Ryanair
27 Sep - 12 Oct	Ryanair
27 Sep - 04 Oct	Ryanair
24 Sep - 28 Sep	Wizz Air
09 Sep - 16 Sep	Ryanair
26 Sep - 05 Oct	Ryanair
17 Sep - 21 Sep	Wizz Air
26 Sep - 02 Oct	Ryanair
29 Sep - 06 Oct	Wizz Air
26 Sep - 03 Oct	Scandinavian Airlines
30 Sep - 03 Oct	Wideroe

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.

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Cheapest return flights from Sandefjord to Keflavik in September from 143€

Return flights