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

Return flights

28 Jul - 04 Aug	jetBlue
30 Jul - 04 Aug	jetBlue
23 Jul - 30 Jul	Air Canada
30 Jul - 06 Aug	Air Canada
29 Jul - 05 Aug	Air Canada
30 Jul - 05 Aug	Air Canada
23 Jul - 27 Jul	Air Canada
15 Jul - 29 Jul	Icelandair
09 Jul - 16 Jul	Icelandair
31 Jul - 04 Aug	Air Canada
24 Jul - 28 Jul	United
07 Jul - 14 Jul	jetBlue
10 Jul - 14 Jul	jetBlue
19 Jul - 24 Jul	jetBlue
18 Jul - 20 Jul	Air Canada
18 Jul - 27 Jul	Air Canada

Also check the deals for one-way flights from Washington 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 Washington to Keflavik in July from $653

Return flights