Cheap flights from St. Louis to San Diego

Flights overview

Useful information for finding cheap flights from St. Louis to San Diego and booking your next trip
Cheapest round-trip flights $210
Frontier 1 stop 27 hr Fri, May 29 — Thu, Jun 4
The cheapest round-trip flight from St. Louis to San Diego is currently $210
Cheapest one-way flight $105
Frontier 1 stop 6 hr Wed, Jun 3
The cheapest one-way flight from St. Louis to San Diego is currently $105
Cheapest nonstop flights $449
Southwest Nonstop 4 hr Sat, Jul 11 — Sun, Jul 19
The cheapest nonstop round-trip flight from St. Louis to San Diego is currently $449
Last-minute weekend getaway $280
Frontier 1 stop 26 hr Fri, May 8 — Sun, May 10
The cheapest last-minute weekend getaway from St. Louis to San Diego is currently $280
Cheapest business class flights $488
Frontier 1 stop 15 hr Sat, May 23 — Mon, Jun 1
The cheapest business class round-trip flight from St. Louis to San Diego is currently $488
Fastest flight 3 hr 40 min The fastest nonstop flight from St. Louis to San Diego takes 3 hr 40 min
Nonstop flights Every day There are direct flights on this route every day.

When is the cheapest time to fly?

The cheapest month to fly from St. Louis to San Diego is typically September. The most expensive month to fly is typically July.
September
Cheapest
Typical prices: $140–240
July
Most expensive
Typical prices: $255–395

Popular airlines from St. Louis to San Diego

  • Southwest
    Nonstop
    from $297
    Typical price: $305–590
    8 weekly nonstop flights
    STL - SAN Every day
    1284 weekly connecting flights
    STL - SAN Every day
  • American
    from $297
    Typical price: $285–590
    338 weekly connecting flights
    STL - SAN Every day
  • United
    from $297
    Typical price: $280–600
    261 weekly connecting flights
    STL - SAN Every day
  • Delta
    from $297
    Typical price: $295–670
    250 weekly connecting flights
    STL - SAN Every day
  • Alaska
    from $397
    Typical price: $395–720
    22 weekly connecting flights
    STL - SAN Every day
  • Frontier
    from $210
    Typical price: $185–435
    22 weekly connecting flights
    STL - SAN Every day

Popular airports near St. Louis

  • St. Louis Lambert International Airport (STL)
    St. Louis United States 21 min 12 mi
  • General Wayne A. Downing Peoria International Airport (PIA)
    Peoria United States 2 hr 36 min 143 mi
  • Columbia Regional Airport (COU)
    Columbia United States 2 hr 8 min 109 mi
  • Indianapolis International Airport (IND)
    Indianapolis United States 3 hr 30 min 222 mi

Popular airports near San Diego

  • San Diego International Airport (SAN)
    San Diego United States 10 min 2 mi
  • Tijuana International Airport (TIJ)
    Tijuana Mexico 37 min 16 mi
  • Los Angeles International Airport (LAX)
    Los Angeles United States 2 hr 2 min 111 mi
  • John Wayne Airport (SNA)
    Santa Ana United States 1 hr 21 min 78 mi

Frequently asked questions about flying from St. Louis to San Diego

The cheapest flights from St. Louis to San Diego are usually in September. Typical ticket prices in September range from $140 to $240.
The cheapest round-trip flight from St. Louis to San Diego recently found on Google Flights was with Frontier from $210. The cheapest one-way flight was with Frontier from $105.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from St. Louis to San Diego is $297, flying from Jul 2 to Jul 8.
  • The cheapest American flight from St. Louis to San Diego is $297, flying from May 21 to May 27.
  • The cheapest United flight from St. Louis to San Diego is $297, flying from Jun 26 to Jul 2.
  • The cheapest Delta flight from St. Louis to San Diego is $297, flying from Jul 23 to Jul 29.
  • The cheapest Alaska flight from St. Louis to San Diego is $397, flying from May 28 to Jun 3.
  • The cheapest Frontier flight from St. Louis to San Diego is $210, flying from May 29 to Jun 4.
The cheapest round-trip flight from St. Louis to San Diego starts at $210 from Fri, May 29 to Thu, Jun 4. The cheapest one-way flight starts at $105 and departs on Wed, Jun 3.
3 hr 40 min is the shortest flight time from St. Louis to San Diego.
Jun–Aug is when most people visit San Diego, where the weather's temperate year-round. Beaches are less crowded Dec–Feb, which bring cooler temperatures but brighter sun. Whale-watching season is from mid-Dec–mid-Mar. Major annual events include Comic-Con International (Jul), a massive comic book convention with workshops and film screenings. Fleet Week (autumn) is a large military appreciation event featuring Navy ship tours, an air show and more.
It's easy to use Google Flights to find the cheapest days to fly from St. Louis to San Diego.
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.
What counts as the best airline for your flights from St. Louis to San Diego really depends on your individual needs. You may have a favorite carrier or a loyalty program you like, but price, convenience, and airports served also come into play. Flexibility and booking terms – Can you change flights if you want to stay longer or get a refund if you have to postpone your trip? – are also factors that help determine which airline is best to fly from St. Louis to San Diego.

In terms of nonstop flights, Southwest is the most popular. Southwest offers 8 nonstop flights and 1,284 connecting flights per week. Southwest flies from St. Louis Lambert International Airport (STL) to San Diego International Airport (SAN) .

Other popular airlines flying from St. Louis to San Diego are:
  • American offers 338 connecting flights per week. American flies from St. Louis Lambert International Airport (STL) to San Diego International Airport (SAN) .
  • United offers 261 connecting flights per week. United flies from St. Louis Lambert International Airport (STL) to San Diego International Airport (SAN) .
  • Delta offers 250 connecting flights per week. Delta flies from St. Louis Lambert International Airport (STL) to San Diego International Airport (SAN) .
  • Alaska offers 22 connecting flights per week. Alaska flies from St. Louis Lambert International Airport (STL) to San Diego International Airport (SAN) .
  • Frontier offers 22 connecting flights per week. Frontier flies from St. Louis Lambert International Airport (STL) to San Diego International Airport (SAN) .
The number of connecting flights refers to distinct flights with at least one stop between St. Louis and San Diego.
The cheapest round-trip flight from St. Louis to San Diego recently found on Google Flights was with Frontier from $210. The cheapest one-way flight was with Frontier from $105.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from St. Louis to San Diego is $297, flying from Jul 2 to Jul 8.
  • The cheapest American flight from St. Louis to San Diego is $297, flying from May 21 to May 27.
  • The cheapest United flight from St. Louis to San Diego is $297, flying from Jun 26 to Jul 2.
  • The cheapest Delta flight from St. Louis to San Diego is $297, flying from Jul 23 to Jul 29.
  • The cheapest Alaska flight from St. Louis to San Diego is $397, flying from May 28 to Jun 3.
  • The cheapest Frontier flight from St. Louis to San Diego is $210, flying from May 29 to Jun 4.
Southwest flies direct from St. Louis to San Diego.
  • There are 8 Southwest direct flights from St. Louis to San Diego per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
The cheapest last-minute deal between St. Louis and San Diego at price $280 is offered by Frontier from Fri, May 8 to Sun, May 10.
Southwest flies direct from St. Louis to San Diego.
  • There are 8 Southwest direct flights from St. Louis to San Diego per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
There are direct flights from St. Louis to San Diego on a daily basis.
The cheapest direct (nonstop) round-trip flights between St. Louis and San Diego start at $449 from Sat, Jul 11 to Sun, Jul 19 with Southwest.
It's easy to find nonstop flights with Google Flights! Once you've searched for flights from St. Louis to San Diego, just select the nonstop flights only option in the 'Stops’ filter in the search form and view all available direct flights and their prices.
The cheapest business class round-trip flights between St. Louis and San Diego start at $488 from Sat, May 23 to Mon, Jun 1 with Frontier.
The cheapest economy class round-trip flights between St. Louis and San Diego start at $210 from Fri, May 29 to Thu, Jun 4.
To book business class trips from St. Louis to San Diego, look for the default Economy selection at the top, and change it to your desired cabin class such as Premium Economy, Business Class, or First Class. You can then select your departure and arrival dates, consider available options, and book your business travel.

You can also adjust the trip type to view one-way fares.
The best last-minute getaway deal for the next weekend between St. Louis and San Diego starts at $280 from Fri, May 8 to Sun, May 10 with Frontier.
The cheapest last-minute deal between St. Louis and San Diego at price $280 is offered by Frontier from Fri, May 8 to Sun, May 10.
To find last-minute flight deals from St. Louis to San Diego, start by entering the city names, select the desired departure and return dates, and hit the Search button to view flight options.

You can check for last-minute flights for the same day or adjust the trip type to see one-way fares.

Search more flights

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