$141 Cheap United flights from San Diego to St. Louis (SAN to STL)

Find The Best Day To Fly from San Diego to St. Louis

Amazing United SAN to STL Flight Deals

The cheapest flights to Lambert-St. Louis Intl. found within the past 7 days were $259 round trip and $141 one way. Prices and availability subject to change. Additional terms may apply.

Tue, Aug 26 - Sat, Sep 13
SAN
San Diego
STL
St. Louis
$259 Roundtrip, found 10 hours ago
$259
Roundtrip
found 10 hours ago
Select United flight, departing Tue, Aug 26 from San Diego to St. Louis, returning Sat, Sep 13, priced at $259 found 10 hours ago
Tue, Sep 2 - Fri, Sep 12
SAN
San Diego
STL
St. Louis
$344 Roundtrip, found 4 hours ago
$344
Roundtrip
found 4 hours ago
Select United flight, departing Tue, Sep 2 from San Diego to St. Louis, returning Fri, Sep 12, priced at $344 found 4 hours ago

STL From SAN Economy Coach Packages on Similar Airlines

Price found within the past 48 hours. Click for updated prices.
The Wildwood Hotel

The Wildwood Hotel

3.5 out of 5
Save 100% on your flight
per person
Aug 7 - Aug 11
found 21 hours ago
Roundtrip non-stop flight included
San Diego (SAN) to St. Louis (STL)
Ameristar Casino Resort and Spa

Ameristar Casino Resort and Spa

4.5 out of 5
per person
Aug 7 - Aug 11
found 21 hours ago
Roundtrip non-stop flight included
San Diego (SAN) to St. Louis (STL)
Hampton Inn By Hilton St Louis Airport

Hampton Inn By Hilton St Louis Airport

2.5 out of 5
per person
Aug 7 - Aug 11
found 21 hours ago
Roundtrip non-stop flight included
San Diego (SAN) to St. Louis (STL)
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Frequently asked questions

Can I catch a flight from San Diego Intl. Airport (SAN) to STL right now?
It's wise to find out about any travel advice reports and quarantine requirements in place in your destination. Ensure you visit our Covid-19 Travel Advisor for up-to-date info on catching a flight to St. Louis Lambert International Airport.
What terminal is United Airlines at San Diego Airport?
Your boarding pass usually displays which terminal your United Airlines flight will be departing from at SAN. It might also be able to give you the arrival details for Lambert Field. If not, you could always ask your airline.
Are there United Airlines non-stop flights from SAN to STL?
United Airlines doesn't provide direct flights between SAN and Lambert Field, so prepare to make a stopover. If you've got enough time between flights, browse the airport shops while you wait for your connection.
How long is a United Airlines flight from SAN to STL?
Weather and air traffic permitting, your United Airlines flight from San Diego Airport to St. Louis Lambert International Airport should take on average 5 hours and 28 minutes. That means you've got plenty of time to enjoy a meal, get some shut-eye and review your travel program before you land.
How many direct and indirect flights does United Airlines fly from SAN to STL?
If you need to lock in a jaunt from SAN to STL, you can choose from around 4 United Airlines flights every day.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to STL, please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.
United Airports
Hop on a(n) United flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
ORDUSAO'Hare Intl.227
DENUSADenver Intl.226
IAHUSAGeorge Bush Intercontinental136
IADUSAWashington Dulles Intl.100
SFOUSASan Francisco Intl.64
LAXUSALos Angeles Intl.23
EWRUSALiberty Intl.20
FRADEUFrankfurt Intl.19
NRTJPNNarita Intl.19
PEKCHNCapital Intl.16

Travelers ❤️ these 🏨 after their flight to St. Louis

Pear Tree Inn St. Louis Airport

Pear Tree Inn St. Louis Airport

2.5 out of 5
10810 Pear Tree Ln, St. Ann, MO
This hotel features a gym and a seasonal outdoor pool. Traveling on business? Take advantage of the business center, free WiFi in public areas, and free airport ...
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Wingate by Wyndham St. Louis Airport

Wingate by Wyndham St. Louis Airport

2.5 out of 5
10820 Pear Tree Lane, St. Ann, MO
This hotel features an outdoor pool and a 24-hour gym. Traveling on business? Take advantage of the business center, free WiFi in public areas, and free airport ...
9.2/10 Wonderful! (1,333 reviews)
"The whole process was smooth checking in and out. the staff were all great. Bedroom was clean"

Reviewed on Jul 15, 2025

Wingate by Wyndham St. Louis Airport
DoubleTree by Hilton St. Louis Airport

DoubleTree by Hilton St. Louis Airport

4 out of 5
4505 Woodson Road, St. Louis, MO
This hotel features an outdoor pool, a 24-hour gym, and a restaurant. Bring the family and enjoy the arcade/game room and kid-friendly dining. Unwind with a ...
7.8/10 Good! (768 reviews)
"Clean and the staff was wonderful"

Reviewed on Jul 10, 2025

DoubleTree by Hilton St. Louis Airport
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.