AirHint found the following cheapest return flights from Boston (BOS) to Oslo (OSL) in August 2025 (see full year).

Return flights

20 Aug - 27 Aug	Icelandair
19 Aug - 26 Aug	SWISS
27 Aug - 03 Sep	Lufthansa
26 Aug - 02 Sep	Lufthansa
25 Aug - 20 Sep	SWISS
22 Aug - 29 Aug	Lufthansa
21 Aug - 28 Aug	Lufthansa
28 Aug - 04 Sep	Lufthansa
31 Aug - 07 Sep	Lufthansa
30 Aug - 06 Sep	Lufthansa
29 Aug - 05 Sep	Lufthansa
23 Aug - 30 Aug	Air France
24 Aug - 31 Aug	Lufthansa

Also check the deals for one-way flights from Boston to Oslo in August.

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 Boston to Oslo in August from $407

Return flights