Cheapest return SEA–OSL flights, September

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

Return flights

30 Sep - 07 Oct Icelandair
24 Sep - 01 Oct Icelandair
27 Sep - 04 Oct Icelandair
28 Sep - 05 Oct Icelandair
23 Sep - 30 Sep Icelandair
25 Sep - 02 Oct Icelandair
01 Sep - 08 Sep Icelandair
19 Sep - 26 Sep Icelandair
13 Sep - 20 Sep Icelandair
03 Sep - 10 Sep Icelandair
20 Sep - 27 Sep Icelandair
22 Sep - 29 Sep Icelandair
08 Sep - 15 Sep Icelandair
09 Sep - 16 Sep Icelandair
14 Sep - 21 Sep Icelandair
29 Sep - 06 Oct Icelandair
26 Sep - 03 Oct Icelandair

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

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