Althought the Scandinavian cities might sound a bit off at first sight the truth is that they are well connected by many low cost airlines. Namely you can consider to book one-way ticket with Norwegian. We recommend to use Skyscanner tool to quickly find out the cheapest flights from your hometown to one of the departure cities.
Promotional deal of British Airways (and their partners American Airlines/US Airways) allows to book the flights between 1st of Nocember and 16th of December 2014 and 7th of January and 28th of February 2015. Date is based on date of yyour outboud flight to USA.
Booking samples
Oslo - Los Angeles and Las Vegas to Germany (Munich) for €349
Oslo - San Francisco and Las Vegas to Germany (Dusseldorf) for €349
Oslo - Los Angeles - Germany (Frankfurt) for €364
Oslo - San Francisco and Los Angeles to Germany (Frankfurt) for €364
Stockholm - San Francisco and Las Vegas to Germany (Frankfurt) for €357
Copenhagen - Los Angeles and Las Vegas to Germany (Hamburg) for €373
Copenhagen - San Francisco and Las Vegas to Germany (Berlin) for €374
Copenhagen - Las Vegas - Germany (Berlin) for €388
Copenhagen - San Francisco and Los Angeles - Germany (Berlin) for €389
Booking sample of cheap open-jaw flights to US West Coast (San Francisco, Los Angeles, Las Vegas) for €349 here. In this case you would be flying from Oslo to San Francisco on 9th of February. Your return flight will be from Las Vegas to Dusseldorf on 22nd of February 2015. As the flights with British Airways are routed via London this is also great opportunity for travellers based in UK. (Or simply if you have better connection to your home city from London than Germany). Again we recommend this solution only if you travel with hand luggage only.