Find cheap Southwest flights to St. Louis
RDU — STL
Aug 26 — Sep 21
Round-trip
1 adult, Economy
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Cheapest Southwest flights from USA to St. LouisExplore the most affordable Southwest flight options available from USA to St. Louis. Find the lowest fares with prices last updated on July 27, 2026.
Explore the most affordable Southwest flight options available from USA to St. Louis. Find the lowest fares with prices last updated on July 27, 2026.
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2212:00 pm
ATL
- STL
Nonstop1h 35m
Southwest
Sat 8/298:30 am
STL
- ATL
Nonstop1h 30m
Southwest
Deal found 7/23![Southwest logo]()
$127
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/158:45 am
ATL
- STL
Nonstop1h 40m
Southwest
Mon 8/173:15 pm
STL
- ATL
Nonstop1h 35m
Southwest
Deal found 7/22![Southwest logo]()
$132
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/177:10 am
ATL
- STL
Nonstop1h 35m
Southwest
Thu 8/2010:10 am
STL
- ATL
Nonstop1h 35m
Southwest
Deal found 7/26![Southwest logo]()
$137
Best Southwest flights from USA to St. LouisDiscover carefully curated Southwest flight deals from USA to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 27, 2026.
Discover carefully curated Southwest flight deals from USA to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 27, 2026.
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/207:05 am
ATL
- STL
Nonstop1h 35m
Southwest
Tue 9/226:40 pm
STL
- ATL
Nonstop1h 30m
Southwest
Deal found 7/26![Southwest logo]()
$127
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/228:45 am
ATL
- STL
Nonstop1h 40m
Southwest
Sat 8/291:20 pm
STL
- ATL
1 stop6h 15m
Southwest
Deal found 7/22![Southwest logo]()
$142
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/112:40 pm
ATL
- STL
Nonstop1h 40m
Southwest
Mon 9/146:50 pm
STL
- ATL
Nonstop1h 30m
Southwest
Deal found 7/23![Southwest logo]()
$142
Direct Southwest flights from USA to St. LouisExplore non-stop Southwest flight options from USA to St. Louis based on user searches, and compare prices and availability for your desired travel dates. Data last updated July 27, 2026.
Explore non-stop Southwest flight options from USA to St. Louis based on user searches, and compare prices and availability for your desired travel dates. Data last updated July 27, 2026.
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/167:00 am
ATL
- STL
Nonstop1h 40m
Southwest
Wed 9/163:05 pm
STL
- ATL
Nonstop1h 30m
Southwest
Deal found 7/26![Southwest logo]()
$117
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2212:00 pm
ATL
- STL
Nonstop1h 35m
Southwest
Sat 8/298:30 am
STL
- ATL
Nonstop1h 30m
Southwest
Deal found 7/23![Southwest logo]()
$127
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/158:45 am
ATL
- STL
Nonstop1h 40m
Southwest
Mon 8/173:15 pm
STL
- ATL
Nonstop1h 35m
Southwest
Deal found 7/22![Southwest logo]()
$132
Last-minute Southwest flights from USA to St. LouisDiscover last-minute Southwest flight deals from USA to St. Louis. Data last updated July 27, 2026 and is based on user searches.
Discover last-minute Southwest flight deals from USA to St. Louis. Data last updated July 27, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2212:00 pm
ATL
- STL
Nonstop1h 35m
Southwest
Sat 8/298:30 am
STL
- ATL
Nonstop1h 30m
Southwest
Deal found 7/23![Southwest logo]()
$127
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/158:45 am
ATL
- STL
Nonstop1h 40m
Southwest
Mon 8/173:15 pm
STL
- ATL
Nonstop1h 35m
Southwest
Deal found 7/22![Southwest logo]()
$132
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/177:10 am
ATL
- STL
Nonstop1h 35m
Southwest
Thu 8/2010:10 am
STL
- ATL
Nonstop1h 35m
Southwest
Deal found 7/26![Southwest logo]()
$137
One-way Southwest flights to St. LouisSearch for one-way Southwest flight options to St. Louis. Find affordable one-way fares based on user searches. Data last updated July 27, 2026.
Search for one-way Southwest flight options to St. Louis. Find affordable one-way fares based on user searches. Data last updated July 27, 2026.
This Southwest deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/267:20 pm
ATL
- STL
Nonstop1h 40m
Southwest
Deal found 7/27![Southwest logo]()
$59
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/298:45 am
ATL
- STL
Nonstop1h 40m
Southwest
Deal found 7/23![Southwest logo]()
$64
This Southwest deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/51:10 pm
ATL
- STL
Nonstop1h 40m
Southwest
Deal found 7/27![Southwest logo]()
$69
Flights to St. Louis with Southwest at a glance
Find detailed information about Southwest flights from USA to St. Louis. Explore the options provided by Southwest to plan your journey from USA to St. Louis. Data last updated July 27, 2026.
Cheapflights Insights
Find cheap Southwest flights to St. Louis
US0-STL
ATL-STL
How long is the flight to St. Louis with Southwest?
On average, Southwest flights from the United States to St. Louis take 2 hours 3 minutes. Flights to St. Louis from other popular cities in the United States will vary in length. Below are a few examples of popular routes and their flight times.
Southwest weekly flight availability to St. Louis
The most flights to St. Louis operated by Southwest are scheduled on a Sunday (125 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (109 on average).
When is the best time to book a flight to St. Louis with Southwest?
The best time to book a flight to St. Louis with Southwest is 55 days before departure. On average, fares are higher if you book on the same day as departure.
When is the cheapest time to fly to St. Louis with Southwest?
Users looking for the cheapest Southwest fares to St. Louis should consider flying on Wednesday afternoons, when prices are typically cheapest. Budget-minded travellers will want to avoid Sunday at noon, when prices are usually at their highest.
FAQs about flights to St. Louis with Southwest
Reviews of Southwest
See what Cheapflights users have to say about their Southwest experience.
Overview
Reviews
Southwest
4,229 reviews
Overview
Food
7.0
Entertainment
7.5
Crew
8.6
Comfort
8.0
Boarding
8.1
Recent reviews
10.0
|Jul 2026Good
8.0
|Jun 2026One delay in a 2 layover flight=a good trip. The crew was great.
6.0
|Jun 2026The seats were super cramped and couldn’t move without hitting other passengers
8.0
|Jun 2026The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.
10.0
|Jun 2026On time and no problems
1 out of 1410
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