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Cheap Flights from St Louis to San Diego

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Compare St Louis to San Diego flight deals

Find the cheapest month or even day of the year to fly to San Diego

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Flight deals from St Louis to San Diego

Looking for a cheap last-minute deal or the best return flight from St Louis to San Diego? Find the lowest prices on one-way and return tickets right here.
San Diego.Rs44,704 per passenger.Departing Thu, 11 Sep.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Thu, 11 Sep, arriving in San Diego International.Price includes taxes and charges.From Rs44,704, select.
San Diego.Rs47,889 per passenger.Departing Mon, 7 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 7 Jul, arriving in San Diego International.Price includes taxes and charges.From Rs47,889, select.
San Diego.Rs51,809 per passenger.Departing Sat, 2 Aug.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Sat, 2 Aug, arriving in San Diego International.Price includes taxes and charges.From Rs51,809, select.
San Diego.Rs54,178 per passenger.Departing Sun, 1 Feb.One-way flight with American Airlines.Outbound indirect flight with American Airlines, departs from St Louis on Sun, 1 Feb, arriving in San Diego International.Price includes taxes and charges.From Rs54,178, select.
San Diego.Rs56,040 per passenger.Departing Fri, 13 Jun.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 13 Jun, arriving in San Diego International.Price includes taxes and charges.From Rs56,040, select.
San Diego.Rs60,470 per passenger.Departing Thu, 7 Aug.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Thu, 7 Aug, arriving in San Diego International.Price includes taxes and charges.From Rs60,470, select.
San Diego.Rs68,962 per passenger.Departing Sat, 19 Jul.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Sat, 19 Jul, arriving in San Diego International.Price includes taxes and charges.From Rs68,962, select.
San Diego.Rs97,166 per passenger.Departing Fri, 27 Jun.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Fri, 27 Jun, arriving in San Diego International.Price includes taxes and charges.From Rs97,166, select.

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

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to San Diego flights are currently cheapest in September.
Jun
from Rs56,040
Jul
from Rs47,889
Aug
from Rs51,809
Sep
from Rs44,704
Oct
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Nov
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Dec
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Jan
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Feb
from Rs54,178
Mar
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Apr
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May
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Direct flights from St Louis to San Diego

Alternative St Louis to San Diego routes

Looking for the cheapest, fastest or easiest route from St Louis to San Diego? You could fly into the following airports instead.

St Louis to San Diego: Flight information

The things to know before you go.
Cheapest flight foundRs44,704
Cheapest month to flySeptember
Average flight time3 hrs, 55 mins
Most popular airlineSouthwest Airlines
Average flights per week11

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

There are 2 airports in San Diego: San Diego International and McClellan-Palomar.
The best price we found for a return flight from St Louis to San Diego is Rs95,206. 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 55 minutes is the average flight time from St Louis to San Diego.
Southwest Airlines flies direct from St Louis to San Diego.
As of June 2025, there are 11 flights per week flying from St Louis to San Diego.
The cheapest month to fly from St Louis to San Diego is usually June 2025.
If you're flying from St Louis Airport, the cheapest airport near San Diego is San Diego International – which is 4.1 km away from the centre of San Diego. We've found flights into this airport from Rs95,206.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to San Diego on Tuesday, 2 September 2025.
Yes – the average flight time is 3 hours and 55 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 San Diego 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 San Diego is around 40 days in advance, so don’t leave your flight to the last minute.
In June, the average temperature is usually around 19°C. August is typically the warmest month in San Diego, when it usually averages around 28°C. You can expect the least rain in June. The coldest month is December, with temperatures averaging 10°C. The rainiest month is February.
Currently, Southwest Airlines offers the cheapest flight tickets to San Diego.

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

  • Jump on a direct flight from Lambert-St. Louis International Airport to San Diego and you'll be travelling for around 3 hours 40 minutes.

  • San Diego is two hours behind St Louis, where Lambert-St. Louis International Airport is located. San Diego runs on the UTC-7 timezone.

  • The most popular route is from Lambert-St. Louis International Airport (STL) to San Diego International Airport (SAN). You can choose from five weekly services between these two airports. Southwest Airlines offers a 06:00 departure between STL and SAN.

  • For a smooth journey, turn up at the airport two hours ahead of international flights and one hour before domestic departures. That way, you won't have to rush to catch your STL to San Diego flight.

  • Heading off during a peak period like a bank holiday? Expect longer lines at security and check-in. Give yourself extra leeway and arrive up to four hours before international flights and two hours ahead of domestic departures.

  • Start your trip at STL and fly nonstop to San Diego International Airport (SAN). That's where you can expect to land when searching for Lambert-St. Louis International Airport to San Diego tickets.

  • Book your ticket with Southwest Airlines. This airline operates direct flights from Lambert-St. Louis International Airport to San Diego.

  • STL is about 16 kilometres from central St Louis. If you're catching a cab, driving or ride-sharing from the centre, it'll take you 20 minutes or so to get there, depending on traffic. If you're planning to take public transport, expect the trip time to be around 35 minutes.

  • Catching an early flight from Lambert-St. Louis International Airport to San Diego? Avoid the stress of rushing to the terminal (and get some extra shut-eye) by choosing one of these hotels near STL:

  • 78.04% of flights that depart Lambert-St. Louis International Airport touch down at their destination on time.

  • The address for STL is 10701 Lambert International Blvd..

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

  • Rs44,704 is currently the lowest price for a one-way Lambert-St. Louis International Airport to San Diego flight. A return flight ticket starts at Rs95,206. These fares may change based on availability and demand.

  • Book two months before flying. Research on pricing trends suggests this is the ideal window for finding cheap flights from STL to San Diego.

  • Schedule your trip for June. That's the best month for scoring an epic deal on Lambert-St. Louis International Airport to San Diego tickets. If your travel dates are flexible, use the 'Whole month' tool to access the lowest price across each month.

  • Finding a cheap flight from STL to San Diego is easy with Price Alerts. Simply set up one of these automatic notifications and we'll notify you as soon as a deal gets even better.

  • Tailor your trip with filters. Choose your arrival and departure times, total journey duration and airlines. You can also sort the results by 'Fastest,' 'Cheapest' or 'Best' flights from Lambert-St. Louis International Airport to San Diego.

Airports in San Diego

San Diego International Airport (SAN)

  • The distance from San Diego International Airport (SAN) to central San Diego is roughly 5 kilometres. It takes around 10 minutes to get to the centre driving.

  • When travelling on public transport, expect a journey time of about 20 minutes.

  • The last thing you want is a long journey to your hotel if you're arriving on a late flight from Lambert-St. Louis International Airport to San Diego. Book one of these accommodation options near SAN instead:

  • Fast-track your adventure by picking up a San Diego International Airport rental car. Grab a set of wheels from Thrifty, Dollar or Budget and explore beyond San Diego's main sights.

  • Lock in the best deal by booking your vehicle from San Diego International Airport about two weeks in advance of your flight from STL to San Diego.

  • The street address for SAN is N Harbour Dr.

McClellan-Palomar Airport (CLD)

  • The centre of San Diego is located around 56 kilometres from McClellan-Palomar Airport (CLD). Once your flight from Lambert-St. Louis International Airport to San Diego has hit the runway and you've made your way out of the airport, the drive should take about 40 minutes.

  • Travelling by public transport will take about 2 hours 15 minutes.

  • After stepping off your STL to San Diego flight, unwind at a hotel close to CLD. These are some great accommodation options that'll help you sink into relaxation mode:

  • Budget, Hertz and Avis make collecting a McClellan-Palomar Airport rental car simple. These trusted providers are located in or around the terminal and will have you ready to go in a flash.

  • Avoid the long lines and paperwork at the rental desk by completing your booking beforehand. Secure your ride from CLD ahead of time so you can just grab the keys and be on your way.

Best time to go to San Diego

  • Carefully consider your trip dates before booking your flight from Lambert-St. Louis International Airport to San Diego. The city comes alive during high season, but hotel prices are typically higher and top attractions can get busy. Go to San Diego in low season if you want a more relaxed vibe.

  • Before booking a Lambert-St. Louis International Airport to San Diego flight ticket, think about the kind of weather forecast you're hoping for. August is the warmest month in San Diego, with temperatures ranging from 17ºC to 28ºC.

  • February sees average temperatures of between 7ºC and 23ºC. Look for a cheap ticket from STL to San Diego around that time if you like cooler conditions.

More about San Diego

  • After booking your flight from Lambert-St. Louis International Airport to San Diego, choose a hotel that combines comfort with a great location. Make one of these accommodation options your base for exploring San Diego:

  • There are so many things to see and do in this city it can be difficult to know where to begin. USS Midway Museum, San Diego Zoo and SeaWorld San Diego are top attractions which should be on any well-planned San Diego itinerary.

Explore more of United States

  • You've visited San Diego, now it's time to discover other parts of United States. Travel around 177 kilometres north-west to Los Angeles to check off its popular sights. From Griffith Observatory to The Broad and La Brea Tar Pits & Museum, your itinerary will be busy.

  • If you're ready to explore another corner of United States, head for Phoenix, roughly 483 kilometres east of San Diego. Desert Botanical Garden, Heard Museum and Papago Park are key highlights.

Plan the rest of your trip from St Louis to San Diego

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.