Frontier AirlinesDepart19:44
Mon, Dec 28AUS → SAN
4h 58m · 1 stop
$138one way, per person
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- Cheapest fare
- $138
- Cheapest month
- December
- Direct flights
- Not recently
- Quickest trip
- 4h 29m
Frontier Airlines · Mon, Dec 28
from $138
Usually 1+ stop
1,860 km
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Cheapest month to fly from Austin to San Diego
Lowest one-way fare per person in each month. Choose a month to see every date.
Cheapest dates in December 2026
The lowest fares we've seen for each day, cheapest first.
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About flights from Austin to San Diego
Austin (AUS) and San Diego (SAN) are about 1,860 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 4h 29m. Over the next few months, one-way fares start from $138, and December 2026 is currently the cheapest month to fly.
These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.
Frequently asked questions
How much is a flight from Austin to San Diego?
The cheapest one-way fare we've seen recently is $138 with Frontier Airlines, departing Monday, December 28, 2026. Over the coming months, the lowest fare in each month ranges from $138 to $171.
What is the cheapest month to fly from Austin to San Diego?
December 2026 currently has the lowest fares, from $138 one way.
Are there direct flights from Austin to San Diego?
We haven't seen direct fares recently, so most journeys include at least one stop.
How long is the flight from Austin to San Diego?
The quickest journey we've seen takes about 4h 29m. Austin and San Diego are around 1,860 km apart.
Which airlines fly from Austin to San Diego?
Recent fares on this route were with Frontier Airlines.
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