Route guide

St. Louis to San Diego (STL-SAN): Nonstop Upgrade & Award Space

Southwest Airlines flies nonstop from St. Louis (STL) to San Diego (SAN) just three times a week. With so few departures, each one carries the only premium seats on the route that day. 2LNR tracks confirmed upgrade and award space on all of them, so a rare opening doesn't slip past you.

Data current as of July 21, 2026, refreshed on an ongoing basis as new schedules and seats are confirmed.

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3
Nonstop flights a week
1,554 mi
Nonstop distance
Free
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Confirmed upgrade & award space on every STL to SAN departure

2LNR tracks confirmed upgrade and award availability on American, Delta, and Alaska and across 30 airlines, segment by segment, date by date. Open the calendar for St. Louis to San Diego to see which departures have real space, or watch the route and get alerted when space opens.

See real availability

Confirmed upgrade and award seats on each STL to SAN departure, checked against live inventory so you know what is open before you book.

Set an alert

Premium inventory turns over fast. Watch this route and 2LNR notifies you when space appears on a date you are tracking.

Plan on the map

See STL to SAN on the interactive route map, with schedules, connections, and route statistics.

Airlines flying St. Louis to San Diego nonstop

Carriers operating STL to SAN nonstop in the current schedule. 2LNR tracks confirmed upgrade and award space on each of them.

  • Southwest Airlines
See STL to SAN on the interactive map →

Frequently asked questions about STL to SAN

How far is San Diego from St. Louis?
STL to SAN covers about 1,554 miles nonstop. Flight times vary by aircraft and season; each scheduled departure on this page lists its own times.
Which airlines fly nonstop from STL to SAN?
Southwest Airlines is currently the only airline flying STL to SAN nonstop. 2LNR tracks confirmed upgrade and award space on every Southwest Airlines departure.
How often does STL to SAN operate?
The nonstop currently runs three times a week, on Southwest Airlines. Thin schedules like this change by season, and an alert will catch anything added.
How do I check upgrade or award availability on STL to SAN?
Open the STL to SAN calendar on this page to see confirmed upgrade and award space by date. You can also set an alert on the St. Louis to San Diego route, and 2LNR will notify you when space opens. It's free to start.

Never miss STL to SAN upgrade or award space

Track confirmed availability, set alerts, and book with confidence. Free to start, no credit card required.

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