Fly from San Francisco to Lisbon, Portugal for $445 round-trip on United and other Star Alliance partners this fall and winter.
You'll be able to score this deal from September 15th onward through the end of the booking schedule in March. It's available for travel on any day of the week but requires at least a 7-night stay in Europe. Some routes may require a long layover so make sure to keep track of the connection times if you want to avoid those. If not maybe you can find one that works for you and explore another city on your way to Lisbon.
Searching on United, I could find seats departing SFO on Monday, October 8, and returning from LIS on Monday, October 15, 2018, at this price.
Deals to Europe have been popping up left and right over the last few months, so make sure to sign up for alerts and bookmark our San Francisco SFO flight deals page and you'll never miss out on a flight bargain again.
Need a place to rest your head in Lisbon? Here's a list of available hotels for the sample dates above on Hotelwatchdog.