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173 € Cheap Flights from San Diego to St Louis

Compare San Diego to St Louis flight deals

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Flight deals from San Diego to St Louis

Looking for a cheap last-minute deal or the best return flight from San Diego to St Louis Airport? If you want to travel next month, return fares start from 173 €. Find the lowest prices on one-way and return tickets right here.
St Louis.173 € per passenger.Departing Thu, 27 Aug, returning Mon, 31 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Thu, 27 Aug, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 31 Aug, arriving in San Diego International.Price includes taxes and charges.From 173 €, select.
St Louis.191 € per passenger.Departing Fri, 11 Sep, returning Mon, 14 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Fri, 11 Sep, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 14 Sep, arriving in San Diego International.Price includes taxes and charges.From 191 €, select.
St Louis.199 € per passenger.Departing Mon, 31 Aug, returning Fri, 11 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Mon, 31 Aug, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 11 Sep, arriving in San Diego International.Price includes taxes and charges.From 199 €, select.
St Louis.201 € per passenger.Departing Tue, 29 Sep, returning Mon, 5 Oct.Return flight with Alaska Airlines and Frontier Airlines.Outbound indirect flight with Alaska Airlines, departs from San Diego International on Tue, 29 Sep, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 5 Oct, arriving in San Diego International.Price includes taxes and charges.From 201 €, select.
St Louis.207 € per passenger.Departing Tue, 3 Nov, returning Tue, 10 Nov.Return flight with United.Outbound indirect flight with United, departs from San Diego International on Tue, 3 Nov, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Tue, 10 Nov, arriving in San Diego International.Price includes taxes and charges.From 207 €, select.
St Louis.210 € per passenger.Departing Fri, 9 Oct, returning Wed, 14 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Fri, 9 Oct, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 14 Oct, arriving in San Diego International.Price includes taxes and charges.From 210 €, select.
St Louis.210 € per passenger.Departing Tue, 28 Jul, returning Fri, 31 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Tue, 28 Jul, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 31 Jul, arriving in San Diego International.Price includes taxes and charges.From 210 €, select.
St Louis.212 € per passenger.Departing Fri, 4 Dec, returning Mon, 7 Dec.Return flight with Delta.Outbound indirect flight with Delta, departs from San Diego International on Fri, 4 Dec, arriving in St Louis.Inbound indirect flight with Delta, departs from St Louis on Mon, 7 Dec, arriving in San Diego International.Price includes taxes and charges.From 212 €, select.
St Louis.221 € per passenger.Departing Thu, 22 Oct, returning Mon, 9 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Thu, 22 Oct, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 9 Nov, arriving in San Diego International.Price includes taxes and charges.From 221 €, select.
St Louis.256 € per passenger.Departing Tue, 10 Nov, returning Tue, 8 Dec.Return flight with United.Outbound indirect flight with United, departs from San Diego International on Tue, 10 Nov, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Tue, 8 Dec, arriving in San Diego International.Price includes taxes and charges.From 256 €, select.
St Louis.260 € per passenger.Departing Wed, 6 Jan, returning Wed, 20 Jan.Return flight with United.Outbound indirect flight with United, departs from San Diego International on Wed, 6 Jan, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Wed, 20 Jan, arriving in San Diego International.Price includes taxes and charges.From 260 €, select.
St Louis.278 € per passenger.Departing Sat, 25 Jul, returning Sat, 1 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Sat, 25 Jul, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sat, 1 Aug, arriving in San Diego International.Price includes taxes and charges.From 278 €, select.
St Louis.294 € per passenger.Departing Tue, 25 Aug, returning Sat, 29 Aug.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Diego International on Tue, 25 Aug, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sat, 29 Aug, arriving in San Diego International.Price includes taxes and charges.From 294 €, select.
St Louis.329 € per passenger.Departing Thu, 10 Sep, returning Sat, 19 Sep.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Diego International on Thu, 10 Sep, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sat, 19 Sep, arriving in San Diego International.Price includes taxes and charges.From 329 €, select.
St Louis.1.074 € per passenger.Departing Tue, 21 Jul, returning Fri, 24 Jul.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from San Diego International on Tue, 21 Jul, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Fri, 24 Jul, arriving in San Diego International.Price includes taxes and charges.From 1.074 €, select.

Find the cheapest month to fly from San Diego 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 to St Louis flights are currently cheapest in August.
Jul
from 210 €
Aug
from 173 €
Sep
from 191 €
Oct
from 210 €
Nov
from 207 €
Dec
from 212 €
Jan
from 260 €
Feb
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Mar
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Apr
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May
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Jun
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Direct flights from San Diego to St Louis

San Diego to St Louis: Alternative routes

Compare routes from San Diego 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 173 €
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Belleville

32km from central St Louis
from 322 €
Search flights

San Diego to St Louis: Flight information

The things to know before you go.
Cheapest flight found173 €
Cheapest month to flyAugust
Average flight time3 hrs, 34 mins
Most popular airlineSouthwest Airlines
Average flights per week9

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

The best price we found for a return flight from San Diego to St Louis is 173 €. 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 to St Louis.
Southwest Airlines and United fly direct from San Diego to St Louis.
As of July 2026, there are 9 flights per week flying from San Diego to St Louis.
The cheapest month to fly from San Diego to St Louis is usually August.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from San Diego to St Louis Airport on Thursday, 27 August 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.

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

  • San Diego's main airport is San Diego International Airport (SAN). Check out your options for departing from here when booking flights from San Diego to St Louis Lambert International Airport (STL).

  • Expect to be in the air for 3 hours 35 minutes. On average, that's the duration of a direct San Diego to St Louis Lambert International Airport flight.

  • St Louis is two hours ahead of San Diego. St Louis Lambert International Airport is located in St Louis, which is in the UTC-6 timezone.

  • Choose from 6 direct flights each week between San Diego International Airport (SAN) and St Louis Lambert International Airport (STL). This is the busiest route, with Southwest Airlines offering a 6:20am departure from SAN to STL.

  • For a smooth journey, turn up at the airport two hours ahead of international flights and an hour before domestic departures. This way, you'll have plenty of time to board your flight from San Diego to STL.

  • Popular months like July or high seasons such as Thanksgiving and Christmas/New Year will mean longer lines at check-in and security. Be on the safe side and head to the airport even earlier. Arriving two hours before a domestic flight and up four hours ahead of an international flight is a wise move.

Airports in San Diego

San Diego International Airport (SAN)

  • San Diego International Airport (SAN) offers an easy route to your destination. Nonstop flights from San Diego to St Louis Lambert International Airport (STL) operate out of this terminal.

  • When departing from SAN, you can catch a direct flight from San Diego to St Louis Lambert International Airport with Southwest Airlines.

  • Most passengers choose to fly with Southwest Airlines from SAN to STL.

  • Southwest Airlines is the most punctual carrier operating on this route, with 70.59% of its services arriving on schedule.

  • Located around 5 kilometres from the centre of San Diego, SAN can be reached in about 15 minutes by car, depending on traffic. The journey by public transport will take roughly 25 minutes.

  • Searching for a comfortable hotel near San Diego International Airport? If you're catching an early flight from San Diego to St Louis Lambert International Airport, these accommodation options will put you moments from check-in:

  • 74% of flights leaving from San Diego International Airport touch down at their destination on schedule.

  • You'll find SAN at N Harbour Dr.

McClellan-Palomar Airport (CLD)

  • The distance from San Diego's city centre to CLD is about 48 kilometres. Consider transport options and possible delays when working out the fastest way to get to the airport.

  • Want to enjoy an extra night away before catching your San Diego to STL flight? Relax in a hotel near McClellan-Palomar Airport before your break officially starts. Here's where you can stay:

  • Flights from McClellan-Palomar Airport have a strong track record for punctuality, with 88% of them touching down as expected.

About St Louis Lambert International Airport (STL)

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

  • From St Louis Lambert International Airport, central St Louis is around 24 kilometres away. It takes about 25 minutes to reach the city centre by car.

  • It'll take around 30 minutes if you're travelling on public transport.

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

  • 86 € is the lowest price for a one-way ticket from San Diego to St Louis Lambert International Airport. A return flight starts from 173 €. These prices may change depending on demand and availability.

  • Booking in advance is often the key to scoring a cheap flight from San Diego to STL. Fares tend to rise as demand increases, so the closer you get to departure, the more expensive your ticket may be.

  • The 'Whole month' search tool will show you the cheapest San Diego to St Louis Lambert International Airport tickets throughout the month. It's a good way to snap up a bargain if your travel plans aren't set in stone.

  • There's no need to search every day to find out if prices have dropped when you create a Price Alert. We'll let you know the moment there's a better deal on plane tickets from San Diego to STL.

  • Filters make it easier to track down a bargain for your flight from San Diego to St Louis Lambert International Airport. Choose the flight times, carriers and stops that match your plans. Then sort the results by 'Cheapest' to find the most affordable option fast.

The best time to fly from San Diego to St Louis Lambert International Airport (STL)

  • July is the most popular month for flights from San Diego to St Louis Lambert International Airport (STL). Visit St Louis in December for a more laid-back experience.

  • The warmest month in St Louis is July, with temperatures ranging between 17ºC (63ºF) and 33ºC (91ºF). Book your San Diego to STL plane ticket then if that's your ideal forecast.

  • For cooler conditions, search for a cheap ticket from San Diego to St Louis Lambert International Airport in January when temperatures are between -7ºC (19ºF) and 8ºC (46ºF).

More about St Louis

Explore more of the United States

  • St Louis has plenty going for it, but there are so many other parts of the United States just waiting to be explored. Around 257 kilometres east of St Louis, a trip to Evansville will fill your itinerary to the brim. Start with attractions like Mesker Park Zoo, Riverfront Park and Evansville Museum of Arts, History & Science.

  • Columbia is another must-experience destination in the United States and is around 177 kilometres west of St Louis. No journey is complete without experiencing Museum of Art and Archaeology, Mizzou Botanic Garden and Francis Quadrangle.

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 12 days.