Cheapest return flights from Seattle to Oslo in September from $435

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

Return flights

23 Sep - 30 Sep Icelandair
24 Sep - 01 Oct Icelandair
16 Sep - 23 Sep Icelandair
17 Sep - 24 Sep Icelandair
19 Sep - 26 Sep Icelandair
21 Sep - 28 Sep Icelandair
28 Sep - 05 Oct Icelandair
18 Sep - 25 Sep Icelandair
22 Sep - 29 Sep Icelandair
29 Sep - 06 Oct Icelandair
25 Sep - 02 Oct Icelandair
30 Sep - 07 Oct Icelandair
20 Sep - 27 Sep Icelandair
26 Sep - 03 Oct Icelandair
27 Sep - 04 Oct Icelandair
08 Sep - 15 Sep Scandinavian Airlines
15 Sep - 22 Sep Scandinavian Airlines

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

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