Cheapest return flights from Washington to Oslo in September from 420€

AirHint found the following cheapest return flights from Washington (IAD) to Oslo (OSL) in September 2026 (see full year).

Return flights

28 Sep - 05 Oct Scandinavian Airlines
30 Sep - 07 Oct Scandinavian Airlines
06 Sep - 13 Sep Icelandair
03 Sep - 10 Sep Icelandair
04 Sep - 11 Sep Icelandair
02 Sep - 09 Sep Icelandair
24 Sep - 01 Oct Scandinavian Airlines
27 Sep - 04 Oct Scandinavian Airlines
08 Sep - 15 Sep Air France
13 Sep - 20 Sep Air France
14 Sep - 21 Sep Air France
04 Sep - 07 Sep Delta
12 Sep - 19 Sep Air France
05 Sep - 12 Sep KLM
25 Sep - 02 Oct Air France
29 Sep - 06 Oct Air France
26 Sep - 03 Oct Air France

Also check the deals for one-way flights from Washington to Oslo in September.

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