AirHint found the following cheapest return flights from London (STN) to Keflavik (KEF) in July 2025 (see full year).

Return flights

12 Jul - 27 Jul	Ryanair
01 Jul - 08 Jul	Ryanair
09 Jul - 23 Jul	Ryanair
12 Jul - 17 Jul	Ryanair
15 Jul - 30 Jul	Ryanair
16 Jul - 27 Jul	Ryanair
16 Jul - 23 Jul	Ryanair
27 Jul - 30 Jul	Fly Play	direct
13 Jul - 17 Jul	Ryanair
02 Jul - 08 Jul	Ryanair
27 Jul - 03 Aug	Fly Play	direct
31 Jul - 03 Aug	Ryanair
27 Jul - 01 Aug	Fly Play	direct
27 Jul - 08 Aug	Fly Play	direct
30 Jul - 03 Aug	Ryanair
30 Jul - 01 Aug	Ryanair
30 Jul - 06 Aug	Ryanair
27 Jul - 04 Aug	Fly Play	direct
09 Jul - 17 Aug	Fly Play	direct
30 Jul - 05 Aug	Ryanair

Also check the deals for one-way flights from London to Keflavik in July.

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 London to Keflavik in July from 196€

Return flights