AirHint found the following cheapest return flights from Bangkok (BKK) to Keflavik (KEF) in June 2025 (see full year).

Return flights

16 Jun - 07 Jul	SWISS
20 Jun - 30 Jun	SWISS
27 Jun - 04 Jul	SWISS
23 Jun - 04 Jul	SWISS
24 Jun - 04 Jul	Finnair
19 Jun - 26 Jun	SWISS
22 Jun - 01 Jul	Finnair
24 Jun - 01 Jul	Finnair
20 Jun - 01 Jul	SWISS
23 Jun - 02 Jul	Finnair
21 Jun - 22 Jun	Finnair

Also check the deals for one-way flights from Bangkok to Keflavik in June.

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 Bangkok to Keflavik in June from $1093

Return flights