Cheap flights from Austin to San Diego from $145 AUS → SAN
Austin-Bergstrom International Airport (AUS) → San Diego International Airport (SAN)
The cheapest return found recently is $409 with Southwest Airlines, 26 Nov – 30 Nov, found 5 days ago. The cheapest one-way found recently is $145 with Frontier Airlines, 20 Dec, found 4 days ago.
- Cheapest one-way found recently
- $145, found 4 days ago
- Cheapest return found recently
- $409, 26 Nov to 30 Nov
- Cheapest month to fly
- December 2026, one-way fares from $145 found in the last 7 days
Return
Not enough comparable prices yet for a usual return price.
Cheapest return found recently
$409
26 Nov – 30 Nov · Southwest Airlines
Austin-Bergstrom International Airport (AUS) → San Diego International Airport (SAN)
Leaves 12:50 p.m. · Return leaves 1:44 p.m. · 9 h 20 min of travel, both ways together
out nonstop, back 1 stop
found 5 days ago
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$409 26 Nov – 30 Novfound 5 days agoSee prices for these dates
It is also the cheapest return we hold, of any age.
What have prices looked like?
Over 34 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $151 to $231.
At $409, the cheapest return found recently is above that range.
Those were the prices on those days, not today's.
Is this a good return price?
Not enough comparable prices yet: we hold return fares on 1 departure date and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other 4-night return fares leaving within 3 days of 26 Nov to compare.
Every date we hold
1 fares on 1 departure dates
See every date as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 26 Nov – 30 Nov | $409 | Southwest Airlines | Austin-Bergstrom International Airport (AUS) → San Diego International Airport (SAN) | out nonstop, back 1 stop | found 5 days ago | See prices for these dates |
Airlines on the cheapest dates: Southwest Airlines.
One-way
The cheapest one-way fare on each of 3 departure dates is usually $158 to $215.
Cheapest one-way found recently
$145
20 Dec · Frontier Airlines
Austin-Bergstrom International Airport (AUS) → San Diego International Airport (SAN)
Leaves 7:44 p.m. · 6 h 14 min trip
1 stop
found 4 days ago
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$145 20 Decfound 4 days agoOpen this trip
It is also the cheapest one-way we hold, of any age.
What have prices looked like?
Over 41 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $82 to $246.
Those were the prices on those days, not today's.
Is this a good one-way price?
Compared with the cheapest one-way fare on each of 3 departure dates from 16 Nov to 28 Dec, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other one-way fares leaving within 3 days of 20 Dec to compare.
Every date we hold
3 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 16 Nov | $260 | Frontier Airlines | Austin-Bergstrom International Airport (AUS) → San Diego International Airport (SAN) | stops unknown | found 7 days ago | Open this trip |
| 20 Dec | $145 | Frontier Airlines | Austin-Bergstrom International Airport (AUS) → San Diego International Airport (SAN) | 1 stop | found 4 days ago | Open this trip |
| 28 Dec | $170 | Frontier Airlines | Austin-Bergstrom International Airport (AUS) → San Diego International Airport (SAN) | 1 stop | found 5 days ago | Open this trip |
Which month looks cheapest?
December 2026 is the cheapest month — from $145.
Airlines on the cheapest dates: Frontier Airlines.
Premium cabin fares from Austin to San Diego
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 26 Nov – 30 Nov in another cabin: Premium economy · Business · First
Today's prices for 20 Dec in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Austin to San Diego?
Return
Fares 30 to 59 days before departure were typically 44% lower than 14 to 29 days before departure.
From the cheapest return each day between 24 Sept and 11 Nov (34 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 14–29 days | $271 | $198 | +80% | 9 |
| 30–59 days | $151 | $151 | Cheapest seen | 14 |
| 60–89 days | $226 | $209 | +50% | 22 |
One-way
The cheapest fares were 14 to 29 days before departure.
From the cheapest one-way each day between 24 Sept and 11 Nov (41 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 14–29 days | $102 | $94 | Cheapest seen | 8 |
| 30–59 days | $138 | $82 | +35% | 23 |
| 60–89 days | $171 | $158 | +68% | 16 |
| 180+ days | $158 | $158 | +55% | 8 |
Live price for these dates
The cheapest return found recently is for 26 Nov – 30 Nov. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from Austin to San Diego?
The cheapest return found recently is $409 with Southwest Airlines, 26 Nov to 30 Nov, found 5 days ago.
How much is a one-way flight from Austin to San Diego?
The cheapest one-way found recently is $145 with Frontier Airlines, 20 Dec, found 4 days ago. The cheapest one-way fare on each of 3 departure dates is usually $158 to $215.
What is the cheapest month to fly from Austin to San Diego?
December 2026 is the cheapest month for a one-way, from $145, 20 Dec, found 4 days ago.
How far ahead should I book a flight from Austin to San Diego?
In 34 days of prices between 24 Sept and 11 Nov, return fares 30 to 59 days before departure were typically 44% lower than 14 to 29 days before departure. In 41 days of prices between 24 Sept and 11 Nov, one-way fares were cheapest 14 to 29 days before departure.
How long is the flight from Austin to San Diego?
The cheapest one-way found recently, with Frontier Airlines on 20 Dec, takes 6 h 14 min with 1 stop.
Which airlines have the cheapest flights from Austin to San Diego?
Between 16 Nov and 28 Dec, Frontier Airlines has the cheapest one-way on all 3 departure dates we hold.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work