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C$137 Cheap Flights from San Diego International (SAN) to St Louis (STL)

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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 C$273. Find the lowest prices on one-way and return tickets right here.
St Louis.C$137 per passenger.Departing Wed., Jun. 10.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Wed., Jun. 10, arriving in St Louis.Price includes taxes and charges.From C$137, select.
St Louis.C$144 per passenger.Departing Mon., Aug. 10.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Mon., Aug. 10, arriving in St Louis.Price includes taxes and charges.From C$144, select.
St Louis.C$145 per passenger.Departing Fri., Jul. 10.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Fri., Jul. 10, arriving in St Louis.Price includes taxes and charges.From C$145, select.
St Louis.C$200 per passenger.Departing Thu., Sep. 17.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Thu., Sep. 17, arriving in St Louis.Price includes taxes and charges.From C$200, select.
St Louis.C$203 per passenger.Departing Wed., Oct. 7.One-way flight with Delta.Outbound indirect flight with Delta, departs from San Diego International on Wed., Oct. 7, arriving in St Louis.Price includes taxes and charges.From C$203, select.
St Louis.C$204 per passenger.Departing Thu., Nov. 12.One-way flight with Delta.Outbound indirect flight with Delta, departs from San Diego International on Thu., Nov. 12, arriving in St Louis.Price includes taxes and charges.From C$204, select.
St Louis.C$213 per passenger.Departing Thu., May 28.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Thu., May 28, arriving in St Louis.Price includes taxes and charges.From C$213, select.
St Louis.C$309 per passenger.Departing Wed., Nov. 18.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Diego International on Wed., Nov. 18, arriving in St Louis.Price includes taxes and charges.From C$309, select.
St Louis.C$310 per passenger.Departing Sun., Jul. 5.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Diego International on Sun., Jul. 5, arriving in St Louis.Price includes taxes and charges.From C$310, select.
St Louis.C$310 per passenger.Departing Wed., Aug. 19.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Diego International on Wed., Aug. 19, arriving in St Louis.Price includes taxes and charges.From C$310, select.
St Louis.C$333 per passenger.Departing Wed., Oct. 7.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Diego International on Wed., Oct. 7, arriving in St Louis.Price includes taxes and charges.From C$333, select.
St Louis.C$373 per passenger.Departing Sat., Jun. 27.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Diego International on Sat., Jun. 27, arriving in St Louis.Price includes taxes and charges.From C$373, select.
St Louis.C$405 per passenger.Departing Sat., Sep. 19.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Diego International on Sat., Sep. 19, arriving in St Louis.Price includes taxes and charges.From C$405, select.
St Louis.C$679 per passenger.Departing Thu., May 28.One-way flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Diego International on Thu., May 28, arriving in St Louis.Price includes taxes and charges.From C$679, select.

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 June.
May
from C$213
Jun.
from C$137
Jul.
from C$145
Aug.
from C$144
Sep.
from C$200
Oct.
from C$203
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 San Diego International to St Louis?

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.

St Louis

20km from central St Louis
ClosestCheapest
from C$137
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Belleville

32km from central St Louis
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Sparta Community

69km from central St Louis
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San Diego to St Louis: Flight information

The things to know before you go.
Cheapest flight foundC$137
Cheapest month to flyJune
Average flight time3 hrs, 34 mins
Most popular airlineSouthwest Airlines
Average flights per week10

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 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 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 May 2026, there are 10 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 June.
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 Wednesday, June 10, 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 Lambert-St. Louis International Airport (STL): what you need to know

  • A direct flight from San Diego International Airport to Lambert-St. Louis International Airport takes an average of 3 hours 32 minutes. The timezone in St Louis is UTC-5, so it's 2 hours ahead of San Diego.

  • For the first departure, jump on the 06:15 flight from San Diego International Airport to Lambert-St. Louis International Airport. If you want to go later, the last flight is at 20:55. With 8 weekly flights from SAN to STL, you can select the one that works best for you.

  • Popular months like July or vacation periods such as summer and spring break will mean longer lines at check-in and security. Traveling then? Play it safe and get to the terminal even earlier. Arriving two hours before domestic flights and up four hours ahead of international flights is a smart move.

  • If you'd like to break up your flight from San Diego International Airport to Lambert-St. Louis International Airport, think about adding a stopover. Simply deselect 'Direct flights only' and find a destination that appeals to you. The most popular stopovers on the SAN - STL route include:

    • Phoenix Sky Harbor International Airport

    • Sacramento International Airport

    • Denver International Airport

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

  • The best price we've seen for a one-way ticket from San Diego International Airport to Lambert-St. Louis International Airport is C$137. The cheapest price for a return flight is C$273. Bear in mind that fares may change due to availability when booking.

  • To get cheap flight tickets from SAN to STL, reserve your journey 9 months before the departure date.

  • May is the cheapest month for flight tickets from San Diego International Airport to Lambert-St. Louis International Airport. If you're looking to fly during a different time of year, the 'Whole month' tool will give you the lowest prices for every month.

  • Create a Price Alert for cheap flight tickets from SAN to STL. You don't need to check every day to see whether fares have fallen. We'll tell you when there's a change in price.

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

Handy information about San Diego International Airport (SAN)

  • San Diego International Airport is about 5 kilometres from central San Diego. If you're catching a cab, driving or ride-sharing from the center, it'll take 9 minutes or so to get there, depending on the traffic. If you're taking public transport, expect the travel time to be approximately 20 minutes.

  • Got an early flight from San Diego International Airport to Lambert-St. Louis International Airport? Avoid the hassle of rushing to the airport (and sneak in some extra snooze time) by picking one of these hotels near SAN:

Arriving at Lambert-St. Louis International Airport (STL)

Getting from Lambert-St. Louis International Airport (STL) to central St Louis

  • From Lambert-St. Louis International Airport, St Louis is approximately 26 kilometres away. It takes around 21 minutes to reach the center driving.

  • When traveling on public transport, expect a journey of around 36 minutes.

When to fly to Lambert-St. Louis International Airport (STL)

  • The quietest month for a flight from San Diego International Airport to Lambert-St. Louis International Airport is April, while July is the most popular. Pick the ideal time to go to St Louis based on whether you prefer a bustling atmosphere or a more laid-back vibe.

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

  • Search for cheap flight tickets from SAN to STL in January if you like traveling in cooler conditions. Temperatures are at their lowest around then, ranging between -8ºC and 7ºC on average.

More about St Louis

Complete your St Louis trip with hotels and a car rental

  • After you've secured your cheap ticket to Lambert-St. Louis International Airport, browse our low prices and exclusive rates for hotels. You can also compare hundreds of car rental companies in one place to find the best car rental price for your St Louis vacation.

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

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