Cheap Flights from San Diego International to St Louis

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      Travellers and cabin class, 1 Adult, Economy
      Southwest Airlines

      Compare San Diego International to St Louis flight deals

      Find the cheapest month or even day of the year to fly to St Louis

      Book the best St Louis fare with no extra fees

      Flight deals from San Diego International to St Louis

      Looking for a cheap last-minute deal or the best return flight from San Diego International Airport to St Louis Airport? If you want to travel next month, return fares start from Rs51,199. Find the lowest prices on one-way and return tickets right here.

      Find the cheapest month to fly from San Diego International to St Louis

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like San Diego International to St Louis flights are currently cheapest in September.

      Direct flights from San Diego International to St Louis

      Southwest Airlines

      San Diego International to St Louis: Alternative routes

      Compare routes from San Diego International to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

      San Diego to St Louis: Flight information

      The things to know before you go.
      Cheapest flight foundRs22,450
      Cheapest month to flySeptember
      Average flight time3 hrs, 34 mins
      Most popular airlineSouthwest Airlines
      Average flights per week8

      Finding cheap flights from San Diego International to St Louis: Frequently asked questions

      The best price we found for a return flight from San Diego International to St Louis is Rs43,969. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
      3 hours and 34 minutes is the average flight time from San Diego International to St Louis.
      Southwest Airlines flies direct from San Diego International to St Louis.
      As of September 2026, there are 8 flights per week flying from San Diego International to St Louis.
      The cheapest month to fly from San Diego International to St Louis is usually November.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from San Diego International Airport to St Louis Airport on Tuesday, 3 November 2026.
      Yes – the average flight time is 3 hours and 34 minutes.
      We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to St Louis but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

      We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to St Louis is around 40 days in advance, so don’t leave your flight to the last minute.

      Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to St Louis.

      Flying from San Diego International Airport (SAN) to St Louis Airport (STL): what you need to know

      • Take a direct flight from San Diego International Airport to St Louis Airport and you'll be in the air for an average of 3 hours 35 minutes.

      • St Louis's timezone is UTC-6, which makes St Louis two hours ahead of San Diego.

      • Take your pick of five weekly San Diego International Airport to St Louis Airport flights. The 06:20 departure with Southwest Airlines is the earliest flight you can take. Southwest Airlines operates the last service of the day at 18:35.

      • Leave plenty of time to make your SAN to STL flight. As a general rule, arrive two hours before international departures and an hour ahead for domestic flights.

      • During popular months like August, it's a good idea to get to the airport even earlier. Arrive two hours before domestic departures and four hours ahead for international flights when you fly during a high season in general.

      • Southwest Airlines is your gateway to discovering St Louis (and maybe even some other exciting parts of the United States!). Check out the direct flights from San Diego International Airport to St Louis Airport offered by this popular airline.

      • The airline that passengers book most often on this route is Southwest Airlines.

      • With 70.59% of services landing as planned, Southwest Airlines is the most punctual carrier offering SAN to STL flights.

      • Consider adding a stopover when booking your ticket from San Diego International Airport to St Louis Airport. Just deselect 'Direct flights only' to break up your trip, or maybe even explore a new city along the way. Check out these options between SAN and STL:

        • Denver International Airport

        • Phoenix Sky Harbour Airport

        • Harry Reid International Airport

      How to find the cheapest flights from San Diego International Airport (SAN) to St Louis Airport (STL)

      • Rs22,450 is currently the lowest price for a one-way San Diego International Airport to St Louis Airport flight. Return flights start from Rs43,969. These prices can change depending on availability.

      • It's usually smart to book ahead of time if you're hoping to get cheap tickets from SAN to STL. That's because airlines change prices based on demand, which tends to increase closer to departure.

      • May is the cheapest month for flights from San Diego International Airport to St Louis Airport. If you're looking to travel during a different time of year, the 'Whole month' tool will give you the lowest airfares for every month.

      • Snapping up cheap flights from SAN to STL couldn't be easier with Price Alerts. All you need to do is create one of these automatic alerts and we'll notify you when there's a better deal.

      • Pick your ideal arrival and departure times, airlines and number of stops with the filters. Or sort your results by 'Cheapest' to find the best deals on flights from San Diego International Airport to St Louis Airport.

      Handy information about San Diego International Airport (SAN)

      • SAN is located at N Harbour Dr.

      • When it comes to San Diego International Airport's on-time performance, data shows 74% of flights stick to their scheduled arrival time.

      • San Diego International Airport is about 5 kilometres from central San Diego. If you're driving, catching a taxi or ride-sharing from the centre, it'll take 15 minutes or so to arrive, depending on the traffic.

      • The trip on public transport takes roughly 25 minutes.

      • Get your trip off to a hassle-free start by staying near SAN. Whether you're catching an early flight from San Diego International Airport to St Louis Airport or just don't want to be rushed, these stays are the answer:

      Arriving at St Louis Airport (STL)

      When to fly to St Louis Airport (STL)

      • July is the most popular month for flights from San Diego International Airport to St Louis Airport. To escape the crowds, head to St Louis in March.

      • The warmest month in St Louis is July, with the temperature ranging between 17ºC and 33ºC. Book your flights from San Diego International Airport to St Louis Airport in this month if this is the type of weather you enjoy.

      • January sees average temperatures of between -7ºC and 8ºC. Look for cheap tickets from SAN to STL around that time if you like cooler conditions.

      Explore more of the United States

      • Chicago is just one of the many cities in the United States waiting to be discovered once you've seen St Louis. Around 418 kilometres away to the north-east, top sights here include Millennium Park, Art Institute of Chicago and Willis Tower.

      • If you're looking to explore another major stop in the United States, head for Indianapolis, about 370 kilometres east of St Louis. Lucas Oil Stadium, Eiteljorg Museum and The Children's Museum of Indianapolis are highlights.

      Prices shown on this page are estimated lowest prices only. Found in the last 12 days.