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

Return flights

30 Sep - 07 Oct	easyJet
30 Sep - 05 Oct	easyJet
11 Sep - 14 Sep	easyJet
02 Sep - 07 Sep	easyJet
30 Sep - 07 Oct	Icelandair	direct
13 Sep - 20 Sep	easyJet
11 Sep - 14 Sep	Icelandair	direct
26 Sep - 29 Sep	Icelandair	direct
14 Sep - 17 Sep	Icelandair	direct
13 Sep - 18 Sep	easyJet
02 Sep - 05 Sep	easyJet
30 Sep - 05 Oct	Icelandair	direct
02 Sep - 09 Sep	easyJet
10 Sep - 13 Sep	easyJet

Also check the deals for one-way flights from Glasgow 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 Glasgow to Keflavik in September from $228

Return flights