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

Return flights

23 Sep - 30 Sep	easyJet
25 Sep - 01 Oct	Fly Play	direct
23 Sep - 27 Sep	easyJet
26 Sep - 03 Oct	Fly Play	direct
27 Sep - 05 Oct	easyJet
23 Sep - 29 Sep	easyJet
25 Sep - 02 Oct	Lufthansa
30 Sep - 05 Oct	Fly Play	direct
30 Sep - 06 Oct	Fly Play	direct
30 Sep - 08 Oct	Fly Play	direct
24 Sep - 30 Sep	Lufthansa
23 Sep - 30 Sep	Fly Play	direct
30 Sep - 07 Oct	Fly Play	direct
26 Sep - 08 Oct	Fly Play	direct
29 Sep - 05 Oct	easyJet
23 Sep - 29 Sep	Fly Play	direct
26 Sep - 29 Sep	Fly Play	direct
25 Sep - 28 Sep	Fly Play	direct
23 Sep - 27 Sep	Fly Play	direct
24 Sep - 27 Sep	Lufthansa

Also check the deals for one-way flights from Paris 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 Paris to Keflavik in September from $299

Return flights