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

Return flights

26 Sep - 28 Sep	Ryanair
24 Sep - 01 Oct	Ryanair
16 Sep - 20 Sep	Ryanair
02 Sep - 10 Sep	Ryanair
02 Sep - 16 Sep	Ryanair
09 Sep - 01 Oct	Ryanair
06 Sep - 20 Sep	Ryanair
20 Sep - 27 Sep	Ryanair
23 Sep - 30 Sep	Ryanair
11 Sep - 14 Sep	Ryanair
02 Sep - 08 Sep	Ryanair
05 Sep - 11 Sep	Ryanair

Also check the deals for one-way flights from Charleroi 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 Charleroi to Keflavik in September from $270

Return flights