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

Return flights

11 Sep - 14 Sep	easyJet
18 Sep - 21 Sep	easyJet
01 Sep - 07 Sep	easyJet
01 Sep - 10 Sep	easyJet
01 Sep - 03 Sep	easyJet
08 Sep - 13 Sep	easyJet
02 Sep - 05 Sep	easyJet
22 Sep - 27 Sep	Icelandair	direct
11 Sep - 15 Sep	Icelandair	direct
22 Sep - 26 Sep	Icelandair	direct

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 193€

Return flights