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

Return flights

26 Sep - 05 Oct	Ryanair
26 Sep - 06 Oct	Ryanair
26 Sep - 04 Oct	Ryanair
27 Sep - 05 Oct	Ryanair
27 Sep - 06 Oct	Ryanair
30 Sep - 11 Oct	Ryanair
27 Sep - 04 Oct	Ryanair
17 Sep - 27 Sep	Ryanair
28 Sep - 05 Oct	Ryanair
06 Sep - 13 Sep	Ryanair
15 Sep - 21 Sep	easyJet
08 Sep - 15 Sep	easyJet

Also check the deals for one-way flights from Toulouse 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 Toulouse to Keflavik in September from $250

Return flights