Both Continental and United Airlines are offering direct flights to London from SFO for $647 including all taxes and fees.
Cheap Flights to Europe from San Francisco
British Airways has just announced a round of flight deals for flights flying out of SFO and going to Europe, Asia, and Africa.
Right now, British Airways is offering the cheapest flights to Portugal. Their flights have a layover in London, Heathrow.
Flying on Tuesdays, you can fly round trip to Barcelona from San Francisco for $622 including all taxes and fees.
This is the time to start thinking about Oktoberfest. Hotels and hostels can book up quickly, and booking flights sooner than two months ahead of time can cause flight prices to go up by a couple hundred dollars.
The American Airlines discount offer is for flights traveling between August 31st and September 30th. Flights into Russia must depart on Tuesdays or Thursdays, and returning flights must be on Mondays and Wednesdays.
Flight have a quick layover in both Chicago and Madrid. Iberia is running multiple flights on each day, so you have some flexibility in terms of when you fly, and flight price should stay under $600 for a little while.
This August, September, and October, a number of airlines are offering one-stop flights between Zurich and San Francisco for $685 including all taxes and fees. Flights take about 17 hours each way and usually have a layover in New York, which is about half the distance.