AirHint found the following cheapest return flights from San Francisco (SFO) to Copenhagen (CPH) in September 2025 (see full year).

Return flights

01 Sep - 03 Sep	British Airways
03 Sep - 10 Sep	United
09 Sep - 16 Sep	United
13 Sep - 19 Sep	Air Canada
01 Sep - 08 Sep	Air Canada
07 Sep - 14 Sep	United
17 Sep - 24 Sep	United
18 Sep - 25 Sep	Air Canada
24 Sep - 01 Oct	United
11 Sep - 18 Sep	United
30 Sep - 07 Oct	United
21 Sep - 28 Sep	United
03 Sep - 05 Oct	Scandinavian Airlines
27 Sep - 04 Oct	United

Also check the deals for one-way flights from San Francisco to Copenhagen in September.

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 San Francisco to Copenhagen in September from 471€

Return flights