Fly from San Francisco to Zurich, Switzerland for $340 roundtrip on Icelandair this fall.
Icelandair is having a good sale at the moment to a wide array of European destinations for sub $400 prices. Fares for these fall deals starting in mid-October through the middle of December. Travel days vary and you'll need to be flexible with your travel dates but this is a great price on this route. If you want to see Iceland along the way you can break up your trip with an up to 3-day layover in Reykjavik (KEF), creating a 2-for-1 travel deal.
You'll have to pack light as this is Icelandair's Economy Light fare. Meaning it only includes a standard sized carry-on bag plus one personal item. If booking on Icelandair.com, you can get a 20% discount on checked baggage fees during or after booking.
As an example, I found seats departing SFO on October 10 and returning from ZRH on October 19, 2018.
Make sure to check out all our great deals to destinations all over Europe on our Icelandair flight deal page.
Need a room in Zurich? Here's a list of available hotels for the sample dates mentioned on Hotelwatchdog.