AirHint found the following cheapest return flights from Pittsburgh (PIT) to Keflavik (KEF) in September 2025 (see full year).

Return flights

04 Sep - 09 Sep	Icelandair	direct
04 Sep - 12 Sep	Icelandair	direct
30 Sep - 08 Oct	Spirit Airlines
18 Sep - 23 Sep	Icelandair	direct
25 Sep - 05 Oct	Spirit Airlines
02 Sep - 05 Sep	Spirit Airlines
25 Sep - 05 Oct	Icelandair	direct
02 Sep - 05 Sep	Icelandair	direct

Also check the deals for one-way flights from Pittsburgh 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 Pittsburgh to Keflavik in September from $361

Return flights