Direct (nonstop) flights from Saint Louis to San Diego
1 airline flys nonstop from Saint Louis Airport (STL) to San Diego International Airport (SAN). It's 1,557 miles (2,505 km), about 4h in the air. Operated by Southwest Airlines.
Southwest Airlines
Route data last updated: May 28, 2026
Airlines with non-stop flights
WN
Southwest Airlines
Alternative Routes
Other ways to fly from Saint Louis to San Diego with one stop · direct emits 263 kg CO₂ per passenger
Looking for the return flight?
SAN → STL: Flights from San Diego to Saint LouisOther direct flights from Saint Louis
Direct flights from San Diego (SAN)
Frequently Asked Questions
How long is the direct flight from Saint Louis to San Diego?
A nonstop flight from Saint Louis (STL) to San Diego (SAN) takes approximately 4 hours. The distance is 1,557 miles (2,505 km).
Which airlines fly nonstop from Saint Louis to San Diego?
Just Southwest Airlines.
Is there a nonstop flight from Saint Louis to San Diego?
Yes. 1 airline: Southwest Airlines.
How far is Saint Louis from San Diego?
The flight distance from Saint Louis to San Diego is 1,557 miles (2,505 km), measured as the great-circle (shortest air) distance. That's roughly the same distance as New York to Miami.
What type of aircraft flies from Saint Louis to San Diego?
At 4h, this route typically uses narrow-body or mid-range jets — Boeing 737 MAX or Airbus A320neo. Varies by airline.
What is the carbon footprint of a flight from Saint Louis to San Diego?
Roughly 263 kg CO2 per passenger one-way. That's about the same as driving 1,315 km.
Is the return flight from San Diego to Saint Louis also nonstop?
Yes — nonstop flights run both ways. Flight time may differ slightly due to wind patterns.
When is the cheapest time to fly from Saint Louis to San Diego?
Midweek flights (Tue/Wed) outside holiday peaks are usually cheapest. 3-6 weeks ahead is a good window for this route. Use "Check Prices" above to compare.
How early should I arrive at Saint Louis Airport for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.