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

Return flights

16 Sep - 23 Sep	Air Canada
03 Sep - 10 Sep	Air Canada
25 Sep - 07 Oct	TAP
16 Sep - 24 Sep	Lufthansa
21 Sep - 30 Sep	SWISS
25 Sep - 02 Oct	Air Canada
23 Sep - 30 Sep	Finnair
10 Sep - 17 Sep	United
09 Sep - 16 Sep	United
14 Sep - 21 Sep	United
17 Sep - 24 Sep	United
22 Sep - 09 Oct	Air Canada
22 Sep - 29 Sep	Lufthansa
24 Sep - 01 Oct	United
29 Sep - 06 Oct	Lufthansa
14 Sep - 04 Oct	United
30 Sep - 07 Oct	Scandinavian Airlines
09 Sep - 04 Oct	United
28 Sep - 05 Oct	United
13 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.

Book a cheap hotel in Copenhagen

Cheap car rent in Copenhagen

Cheapest return flights from San Francisco to Copenhagen in September from 459€

Return flights