AirHint found the following cheapest return flights from Houston (IAH) to Keflavik (KEF) in May 2026 (see full year).

Return flights

05 May - 13 May	Finnair
02 May - 13 May	Finnair
02 May - 12 May	Finnair
02 May - 10 May	Lufthansa
04 May - 12 May	Lufthansa
01 May - 09 May	Lufthansa
26 May - 02 Jun	United
25 May - 02 Jun	United
27 May - 04 Jun	United
27 May - 03 Jun	United
26 May - 03 Jun	United
28 May - 05 Jun	United
30 May - 06 Jun	United
25 May - 01 Jun	United
31 May - 07 Jun	United
24 May - 01 Jun	United

Also check the deals for one-way flights from Houston to Keflavik in May.

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 Houston to Keflavik in May from $612

Return flights