Deal found on October 22, 2026
St. Louis to San Francisco
$211$42650% off
Round trip
Nonstop-friendly San Francisco fares out of St. Louis are running about $211 right now on Frontier, down from the roughly $476 this route usually costs, a 56% discount. Availability is opening up over the coming months, and San Francisco gives you everything from the bay to wine country within an easy drive. At under $220 round trip, this is one of the easiest big-city West Coast bookings on the board today.
Travel dates
Dates in December
e.g. Dec 7 – Dec 16 · 9 nights
Date options
9 at this price
Lowest we've seen
$160
Search these dates on Google FlightsSee San Francisco price historySan Francisco guide: weather, costs & things to do
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