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C$144 Cheap Flights from St Louis (STL) to San Diego International (SAN)

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Flight deals from St Louis to San Diego International

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to San Diego International Airport? If you want to travel next month, return fares start from C$273. Find the lowest prices on one-way and return tickets right here.
San Diego.C$144 per passenger.Departing Tue., Jun. 9.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Tue., Jun. 9, arriving in San Diego International.Price includes taxes and charges.From C$144, select.
San Diego.C$145 per passenger.Departing Mon., Jul. 13.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Mon., Jul. 13, arriving in San Diego International.Price includes taxes and charges.From C$145, select.
San Diego.C$171 per passenger.Departing Mon., Sep. 14.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Mon., Sep. 14, arriving in San Diego International.Price includes taxes and charges.From C$171, select.
San Diego.C$173 per passenger.Departing Sun., Aug. 9.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Sun., Aug. 9, arriving in San Diego International.Price includes taxes and charges.From C$173, select.
San Diego.C$204 per passenger.Departing Thu., Nov. 12.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Thu., Nov. 12, arriving in San Diego International.Price includes taxes and charges.From C$204, select.
San Diego.C$204 per passenger.Departing Wed., Oct. 28.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Wed., Oct. 28, arriving in San Diego International.Price includes taxes and charges.From C$204, select.
San Diego.C$213 per passenger.Departing Sat., May 30.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Sat., May 30, arriving in San Diego International.Price includes taxes and charges.From C$213, select.
San Diego.C$234 per passenger.Departing Sat., Jun. 27.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Sat., Jun. 27, arriving in San Diego International.Price includes taxes and charges.From C$234, select.
San Diego.C$268 per passenger.Departing Tue., Jul. 14.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Tue., Jul. 14, arriving in San Diego International.Price includes taxes and charges.From C$268, select.
San Diego.C$268 per passenger.Departing Wed., Oct. 28.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Wed., Oct. 28, arriving in San Diego International.Price includes taxes and charges.From C$268, select.
San Diego.C$296 per passenger.Departing Thu., Nov. 12.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Thu., Nov. 12, arriving in San Diego International.Price includes taxes and charges.From C$296, select.
San Diego.C$307 per passenger.Departing Thu., Aug. 13.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Thu., Aug. 13, arriving in San Diego International.Price includes taxes and charges.From C$307, select.
San Diego.C$307 per passenger.Departing Mon., Sep. 14.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Mon., Sep. 14, arriving in San Diego International.Price includes taxes and charges.From C$307, select.
San Diego.C$594 per passenger.Departing Sat., May 30.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from St Louis on Sat., May 30, arriving in San Diego International.Price includes taxes and charges.From C$594, select.

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

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 International flights are currently cheapest in June.
May
from C$213
Jun.
from C$144
Jul.
from C$145
Aug.
from C$173
Sep.
from C$171
Oct.
from C$204
Nov.
from C$204
Dec.
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Jan.
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Feb.
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Mar.
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Apr.
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Which airlines fly from St Louis to San Diego International?

St Louis to San Diego International: Alternative routes

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

San Diego International

4km from central San Diego
ClosestCheapest
from C$144
Search flights

McClellan-Palomar

48km from central San Diego
from C$467
Search flights

St Louis to San Diego: Flight information

The things to know before you go.
Cheapest flight foundC$144
Cheapest month to flyJune
Average flight time3 hrs, 51 mins
Most popular airlineSouthwest Airlines
Average flights per week7

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

The best price we found for a return flight from St Louis to San Diego International is C$273. 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 51 minutes is the average flight time from St Louis to San Diego International.
Southwest Airlines flies direct from St Louis to San Diego International.
As of May 2026, there are 7 flights per week flying from St Louis to San Diego International.
The cheapest month to fly from St Louis to San Diego International is usually June.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to San Diego International Airport on Saturday, June 6, 2026.
Yes – the average flight time is 3 hours and 51 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 International 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.
Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to San Diego International.

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

  • 3 hours 53 minutes is the average time for a direct flight from Lambert-St. Louis International Airport to San Diego International Airport. San Diego is 2 hours behind St Louis and is in the UTC-7 timezone.

  • There are 9 flights from Lambert-St. Louis International Airport to San Diego International Airport weekly. Hop on the 06:15 flight if you want to be on your way as early as possible. If you'd prefer to make the most of your day before heading off, the latest flight from STL to SAN is 20:55.

  • If you're jetting off during a major holiday or other peak period, allow for even more time. A good rule is two hours ahead of domestic flights and up to four hours before international departures. Security and check-in lines will be longer.

  • If you'd like a stopover for your flight from Lambert-St. Louis International Airport to San Diego International Airport, simply uncheck 'Direct flights only' and explore your options. These are the top stopovers between STL and SAN:

    • Denver International Airport

    • Phoenix Sky Harbor International Airport

    • Harry Reid Airport (formerly McCarran Airport)

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

  • C$144 is the lowest price for a one-way ticket from Lambert-St. Louis International Airport to San Diego International Airport. Return flights start at C$273. These prices can change based on availability and demand.

  • Score cheap flight tickets from STL to SAN by booking at least 10 months ahead. Based on our research, that's the sweet spot for landing a bargain.

  • Schedule your trip for June. That's the cheapest month for flight tickets from Lambert-St. Louis International Airport to San Diego International Airport. If your travel dates are flexible, try out the 'Whole month' tool to find the lowest price across each month.

  • Snapping up a cheap ticket from STL to SAN is straightforward with Price Alerts. All you need to do is create one of these automatic alerts and we'll notify you as soon as there's a better deal.

  • Play around with filters to find the right journey for you. To see the 'Fastest,' 'Best' or 'Cheapest' flights from Lambert-St. Louis International Airport to San Diego International Airport, use the 'Sort by' tool. You can also filter results by airline, departure and arrival times, and number of stops.

Handy information about Lambert-St. Louis International Airport (STL)

  • Lambert-St. Louis International Airport is about 26 kilometres from central St Louis. If you're catching a cab, ride-sharing or driving from the center, it'll take 21 minutes or so to get there, depending on traffic. If you're using public transport, expect the travel time to be around 36 minutes.

  • Catching an early flight from Lambert-St. Louis International Airport to San Diego International Airport? Avoid rushing to the terminal (and sneak in some extra snooze time) by picking one of these stays near STL:

Arriving at San Diego International Airport (SAN)

  • If you're arriving on a late flight from Lambert-St. Louis International Airport to San Diego International Airport, few things beat the convenience of staying near the terminal. Pick up your bags from the carousel and then be showered and relaxing not long after at one of these hotels near SAN:

Getting from San Diego International Airport (SAN) to central San Diego

  • San Diego International Airport is approximately 5 kilometres from central San Diego. With your own car rental or if you take a cab, the drive is about 9 minutes.

  • It takes roughly 20 minutes to get there by public transport.

When to fly to San Diego International Airport (SAN)

  • July is the busiest month for flights from Lambert-St. Louis International Airport to San Diego International Airport. To steer clear of the crowds, go to San Diego in May.

  • Before locking in your flight from Lambert-St. Louis International Airport to San Diego International Airport, consider the type of weather you enjoy. August is the warmest month in San Diego, with the temperature ranging from 17ºC to 28ºC.

  • If you want cooler conditions, search for a cheap ticket from STL to SAN in February. Average temperatures are between 7ºC and 23ºC then.

More about San Diego

  • After locking in your flights from STL to SAN, you'll need to find a place to stay in San Diego. Make one of these options your base for exploring this city:

  • There are so many things to discover in this city it can be hard to know where to begin. San Diego Zoo, USS Midway Museum and SeaWorld San Diego are major attractions which should feature on every San Diego itinerary.

Complete your San Diego trip with hotels and a car rental

  • You've booked your cheap ticket to San Diego International Airport — next up is finding a place to stay, and maybe even a set of wheels. We've compared prices across hundreds of companies to bring you the top hotels and car rental deals in San Diego.

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