Long time no competitive deal from Germany to California so here is one based on a Star Alliance airline TAP Portugal offering discounted flights from Frankfurt, Munich or Dusseldorf to San Francisco available from €351 return. This is inclusive of taxes, meals, and handbags. Checked luggage for an additional fee. As in the case of most of the deals with TAP you can book a free multi-stop in Portugal on the way. Multi-city tickets to visit both Lisbon and San Francisco are currently available for €382.
There is no information regarding minimum/maximum stay durations, but any layover in Lisbon/Porto cannot exceed 5 days. You will need either a U.S. visa or ESTA to enter the USA (charged at $21 per person and you must arrange it prior to departing).
Flying from: Frankfurt, Munich, Dusseldorf
Flying to: San Francisco
Outbound travel dates: November 2022 or January to March 2023
Max stay: 3 months
Book by: 2nd of October
Booking sample of cheap return flights from Germany to California for €351! Outbound from Frankfurt to San Francisco on the 7th of November. Inbound from San Francisco back to Germany airport through Lisbon on the 21st of November 2021.