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

Return flights

25 Jul - 04 Aug	Spirit Airlines
12 Jul - 19 Jul	Spirit Airlines
10 Jul - 21 Jul	Spirit Airlines
22 Jul - 31 Jul	Spirit Airlines
19 Jul - 28 Jul	Spirit Airlines
25 Jul - 03 Aug	Spirit Airlines
02 Jul - 08 Jul	Spirit Airlines
10 Jul - 11 Jul	Spirit Airlines
31 Jul - 06 Aug	Air France
26 Jul - 01 Aug	Air France
24 Jul - 02 Aug	Spirit Airlines
24 Jul - 01 Aug	Spirit Airlines
25 Jul - 01 Aug	Spirit Airlines
06 Jul - 13 Jul	Spirit Airlines
26 Jul - 03 Aug	Air France

Also check the deals for one-way flights from Houston 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 Houston to Keflavik in July from $577

Return flights