Earn point on your loyalty program!arrow arc left

Cheap flights from St Louis (STL) to San Diego (SAN)

Know your dates, get live prices in seconds
airplane logo

pin logo

calendar
Departure
calendar backward
Return
airplane logo
1 Adults (11+)
0 Children (2~11)
0 Infants (0~2)
Save up to 31%
Book Flight + Hotel at the same time

How to find the cheapest flight from St Louis (STL) to San Diego (SAN)

How to find the cheapest flight from St Louis (STL) to San Diego (SAN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to San Diego (SAN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to San Diego (SAN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.

Cheap flights from St Louis to San Diego in August , September 2026

27 Aug - 06 Sep $ 373.00
STL
St Louis
Frontier Airlines
1 STOPS
SAN
San Diego
SAN
San Diego
Frontier Airlines
1 STOPS
STL
St Louis
Pick dates
31 Aug - 05 Sep $ 407.00
STL
St Louis
United Airlines
1 STOPS
SAN
San Diego
SAN
San Diego
United Airlines
1 STOPS
STL
St Louis
Pick dates
27 Aug - 03 Sep $ 478.00
STL
St Louis
Frontier Airlines
1 STOPS
SAN
San Diego
SAN
San Diego
Frontier Airlines
1 STOPS
STL
St Louis
Pick dates

Last minute flights from St Louis to San Diego

27 Aug - 31 Aug $ 436.00
STL
St Louis
Frontier Airlines
1 STOPS
SAN
San Diego
SAN
San Diego
Frontier Airlines
1 STOPS
STL
St Louis
Pick dates
24 Aug - 31 Aug $ 497.00
STL
St Louis
United Airlines
1 STOPS
SAN
San Diego
SAN
San Diego
United Airlines
1 STOPS
STL
St Louis
Pick dates
27 Aug - 31 Aug $ 543.00
STL
St Louis
Alaska Airlines
1 STOPS
SAN
San Diego
SAN
San Diego
Alaska Airlines
1 STOPS
STL
St Louis
Pick dates

One-way flights to San Diego from St Louis

6:35 AM - 10:18 AM
Alaska Airlines
1 Stops
8h 44m
STL - SAN
$ 244
Kiwi
Pick dates
6:35 AM - 10:18 AM
Alaska Airlines
1 Stops
8h 44m
STL - SAN
$ 244
Kiwi
Pick dates
9:00 AM - 11:15 AM
United Airlines
1 Stops
5h 41m
STL - SAN
$ 293
Kiwi
Pick dates

How to find the cheapest flight from St Louis (STL) to San Diego (SAN)

Related info for your journey
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to San Diego (SAN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to San Diego (SAN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.