Of course, the return ticket will cost you a bit more. But given the distance and the average cost to get from the West Coast to Europe, anything under $400 is almost unbelievable.
WOW is set to announce all its inaugural fares to the rest of Europe soon, but if you act fast, you'll beat the rush. Reykjavik is expected to remain the lowest-priced fare, but according to price-checking on the airline's website, one-way flights from California to London, Amsterdam, and Paris start at $199 during the month of October. Expect layovers with all these fares, but with prices this low, who cares? Also, prices are subject to change.