Cheapest return flights from Seattle to Oslo in September from $457

AirHint found the following cheapest return flights from Seattle (SEA) to Oslo (OSL) in September 2025 (see full year).

Return flights

03 Sep - 10 Sep Scandinavian Airlines
17 Sep - 24 Sep Scandinavian Airlines
24 Sep - 01 Oct Icelandair
25 Sep - 02 Oct Icelandair
26 Sep - 03 Oct Icelandair
28 Sep - 05 Oct Icelandair
23 Sep - 03 Oct Icelandair
25 Sep - 03 Oct Icelandair
21 Sep - 28 Sep Icelandair
22 Sep - 29 Sep Icelandair
21 Sep - 29 Sep Icelandair
08 Sep - 15 Sep Icelandair
02 Sep - 09 Sep Icelandair
05 Sep - 12 Sep Icelandair
04 Sep - 12 Sep Icelandair
09 Sep - 17 Sep Icelandair
24 Sep - 04 Oct Scandinavian Airlines
30 Sep - 07 Oct Scandinavian Airlines
29 Sep - 06 Oct Delta
27 Sep - 04 Oct Delta

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

Skyscanner

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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