3 hr 22 min is the shortest flight time from San Francisco to Austin.

The cheapest days to fly are usually in September. Typical prices range from $125 to $210.

The best round-trip deal recently found on Google Flights from San Francisco to Austin was with Frontier from $108. The best one-way deal was with Frontier from $54.

There are direct flights from San Francisco to Austin on a daily basis.

United and Alaska fly direct from San Francisco to Austin.

The cheapest round-trip flight from San Francisco to Austin starts at $108 from Thu, Oct 31 to Wed, Nov 6. The cheapest one-way flight starts at $54 and departs on Thu, Oct 31.

Austin has mild winters and very hot, humid summers that make some outdoor activities inadvisable. Most visitors arrive Mar–Sep. Spring sees crowds for the South by Southwest (SXSW) music and film festival (Mar) and the blooming of the bluebonnet (mid-Mar–mid Apr), which is the Texas state flower. Hotels are especially crowded during college graduation weekends (May). Fall's popular events are the Austin City Limits music festival (Sep), college football season (Sep–Nov) and the Austin Film Festival (Oct).

It's easy to use Google Flights to find the cheapest days to fly from San Francisco to Austin.
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.