Fly nonstop from Philadelphia to San Francisco for $197 roundtrip on Alaska Airlines this winter. This deal is quite similar to other ones we have seen today that are available for cross-country flights.
Tickets at this price are available on Tuesday, Wednesday, and Saturdays starting on January 8 through February 13, 2019. The travel window is small, but for the price, you can't go wrong with this deal. One-way flights can also be purchased for $99, so you can also book one those to create a custom itinerary.
This deal is also available on United, but it books into their restrictive Basic Economy fare class, so I'd rather choose Alaska given the choice. If you happen to be a United Airlines frequent flyer, maybe their option works best for your specific travel needs.
On Alaska's website, I found tickets at this price departing PHL on Saturday, February 2 and returning from SFO on Saturday, February 9, 2019. Seats are pretty easy to find as long as you search in the mentioned travel window.
Have other destinations in mind? Take a look at our Philadelphia (PHL) flight page for a whole list of discount deals we've found today.
Need a place to stay in the City by the Bay? Here are the top available hotels for the mentioned dates on Hotelwatchdog.