AirHint found the following cheapest return flights from Dallas-Fort Worth (DFW) to Keflavik (KEF) in September 2025 (see full year).

Return flights

24 Sep - 01 Oct	Spirit Airlines
10 Sep - 17 Sep	Spirit Airlines
17 Sep - 24 Sep	Spirit Airlines
29 Sep - 06 Oct	Spirit Airlines
11 Sep - 18 Sep	Frontier Airlines
28 Sep - 05 Oct	Spirit Airlines
05 Sep - 12 Sep	Spirit Airlines
01 Sep - 08 Sep	Spirit Airlines
21 Sep - 04 Oct	Spirit Airlines
19 Sep - 26 Sep	Spirit Airlines
27 Sep - 04 Oct	Frontier Airlines
09 Sep - 16 Sep	Spirit Airlines
14 Sep - 21 Sep	Spirit Airlines
21 Sep - 28 Sep	Spirit Airlines
12 Sep - 19 Sep	Spirit Airlines
30 Sep - 07 Oct	Air France
25 Sep - 02 Oct	Air Canada
26 Sep - 03 Oct	Spirit Airlines

Also check the deals for one-way flights from Dallas-Fort Worth 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 Dallas-Fort Worth to Keflavik in September from $478

Return flights