AirHint found the following cheapest return flights from Washington (IAD) to Oslo (OSL) in October 2025 (see full year).

Return flights

06 Oct - 20 Oct	Scandinavian Airlines
07 Oct - 14 Oct	Scandinavian Airlines
09 Oct - 16 Oct	Scandinavian Airlines
14 Oct - 21 Oct	Scandinavian Airlines
20 Oct - 27 Oct	Scandinavian Airlines
23 Oct - 30 Oct	Scandinavian Airlines
29 Oct - 05 Nov	Scandinavian Airlines
01 Oct - 08 Oct	Scandinavian Airlines
21 Oct - 04 Nov	Lufthansa
05 Oct - 12 Oct	Scandinavian Airlines
26 Oct - 02 Nov	Icelandair
17 Oct - 24 Oct	United
08 Oct - 19 Oct	United

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

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 Washington to Oslo in October from 340€

Return flights