AirHint found the following cheapest return flights from Raleigh-durham (RDU) to Keflavik (KEF) in September 2025 (see full year).

Return flights

22 Sep - 01 Oct	Air France
18 Sep - 22 Sep	Air Canada
14 Sep - 19 Sep	Air France
13 Sep - 20 Sep	Air Canada
11 Sep - 17 Sep	Air Canada
12 Sep - 20 Sep	Air Canada
27 Sep - 04 Oct	Air Canada
10 Sep - 24 Sep	Delta
12 Sep - 21 Sep	Air Canada
18 Sep - 21 Sep	Air Canada
22 Sep - 01 Oct	Icelandair	direct
14 Sep - 19 Sep	Icelandair	direct
01 Sep - 03 Sep	Frontier Airlines
27 Sep - 03 Oct	Icelandair	direct
27 Sep - 04 Oct	Icelandair	direct
04 Sep - 14 Oct	Air Canada
04 Sep - 14 Oct	Icelandair	direct

Also check the deals for one-way flights from Raleigh-durham to Keflavik in September.

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 Raleigh-durham to Keflavik in September from $462

Return flights