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

Return flights

15 Oct - 08 Nov	Scandinavian Airlines
21 Oct - 28 Oct	Scandinavian Airlines
21 Oct - 04 Nov	Delta
20 Oct - 24 Oct	Air Canada
10 Oct - 01 Nov	Scandinavian Airlines
22 Oct - 29 Oct	Scandinavian Airlines
18 Oct - 01 Nov	British Airways

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 $476

Return flights