$45 Cheap Flights from Atlanta (ATL) to St. Louis (STL)

View $45 flight on Thu, Sep 11, 2025Opens in a new window

Popular airlines from Hartsfield-Jackson Atlanta International Airport (ATL) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Atlanta to St. Louis (ATL-STL)

Prices were available within the past 7 days and start at $45 for one-way flights and $89 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sat, Aug 16 - Mon, Aug 25
ATL
Atlanta
STL
St. Louis
$89 Roundtrip, found 3 days ago
$89
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Sat, Aug 16 from Atlanta to St. Louis, returning Mon, Aug 25, priced at $89 found 3 days ago
Frontier Airlines
Thu, Sep 4 - Mon, Sep 8
ATL
Atlanta
STL
St. Louis
$90 Roundtrip, found 5 hours ago
$90
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Thu, Sep 4 from Atlanta to St. Louis, returning Mon, Sep 8, priced at $90 found 5 hours ago
Frontier Airlines
Sat, Aug 23 - Sat, Aug 30
ATL
Atlanta
STL
St. Louis
$93 Roundtrip, found 4 days ago
$93
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Sat, Aug 23 from Atlanta to St. Louis, returning Sat, Aug 30, priced at $93 found 4 days ago
Frontier Airlines
Sat, Aug 23 - Mon, Aug 25
ATL
Atlanta
STL
St. Louis
$94 Roundtrip, found 18 hours ago
$94
Roundtrip
found 18 hours ago
Select Frontier Airlines flight, departing Sat, Aug 23 from Atlanta to St. Louis, returning Mon, Aug 25, priced at $94 found 18 hours ago
Frontier Airlines
Thu, Sep 11 - Sun, Sep 14
ATL
Atlanta
STL
St. Louis
$99 Roundtrip, just found
$99
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Sep 11 from Atlanta to St. Louis, returning Sun, Sep 14, priced at $99 just found
Frontier Airlines
Thu, Jul 24 - Sat, Jul 26
ATL
Atlanta
STL
St. Louis
$103 Roundtrip, found 1 hour ago
$103
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Thu, Jul 24 from Atlanta to St. Louis, returning Sat, Jul 26, priced at $103 found 1 hour ago
Southwest Airlines
Tue, Sep 2 - Thu, Sep 4
ATL
Atlanta
STL
St. Louis
$115 Roundtrip, found 1 hour ago
$115
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Tue, Sep 2 from Atlanta to St. Louis, returning Thu, Sep 4, priced at $115 found 1 hour ago
American Airlines
Tue, Sep 2 - Thu, Sep 4
ATL
Atlanta
STL
St. Louis
$125 Roundtrip, found 1 hour ago
$125
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Tue, Sep 2 from Atlanta to St. Louis, returning Thu, Sep 4, priced at $125 found 1 hour ago
Spirit Airlines
Thu, Sep 11 - Sun, Sep 14
ATL
Atlanta
STL
St. Louis
$135 Roundtrip, just found
$135
Roundtrip
just found
Select Spirit Airlines flight, departing Thu, Sep 11 from Atlanta to St. Louis, returning Sun, Sep 14, priced at $135 just found
United
Thu, Sep 25 - Mon, Sep 29
ATL
Atlanta
STL
St. Louis
$217 Roundtrip, found 9 hours ago
$217
Roundtrip
found 9 hours ago
Select United flight, departing Thu, Sep 25 from Atlanta to St. Louis, returning Mon, Sep 29, priced at $217 found 9 hours ago

Find the cheapest month to fly from Atlanta (ATL) to St. Louis (STL)

July is typically the cheapest month to fly

From $93 - $396 per traveler.

Graph displaying average flight prices per month

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $103
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $103
0
Flights from Atlanta (ATL) to St. Louis (STL)
Origin airport
Hartsfield-Jackson Atlanta Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, United
Roundtrip price
$82
Distance
482 mi

Atlanta to St. Louis Flights

The cheapest times to fly from Atlanta to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Atlanta to St. Louis are during the month of August. You can find some of the cheapest flights from Atlanta to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Atlanta to St. Louis

Sunday is one of the best days to book for cheap flights from Atlanta to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Atlanta to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Atlanta to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $45 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Atlanta to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Atlanta to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL) cost?
Pick up cheap return flights starting at $85 from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL). This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Frontier Airlines flight leaving ATL on July 26 2025 and touching down at STL. The price was last updated on July 2 2025 and has not changed since.
What is the cheapest month to fly from ATL to STL?
The cheapest flights from ATL to STL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL)?
When jetting out of Hartsfield-Jackson Atlanta Intl. Airport (ATL), you can hop on a nonstop flight to Lambert-St. Louis Intl. Airport (STL) with Delta Air Lines.
What is the cheapest airline that flies from ATL to STL?
Right now, the cheapest airline offering one-way flights from ATL to STL is Frontier Airlines. You can jet off on this route from $45. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from ATL on September 25 2025. Prices were last updated on July 2 2025 and have not changed since.
How many flights per day from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL)?
When taking off from Hartsfield-Jackson Atlanta Intl. Airport (ATL), you can pick from an average of 8 daily direct flights to Lambert-St. Louis Intl. Airport (STL).
What are the most popular departure times for flights from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL)?
The 3 PM departures from ATL to STL are the top choice for many travelers. They can also be more expensive. If you want to save on your trip, book during off-peak hours.
What day of the week has the most flights from ATL to STL?
Friday has the most flights from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL). Consider jetting off on this day and you'll have a greater chance of finding a departure that works with your plans.
What is the earliest flight from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL)?
Catch the earliest flight at around 7:45AM UTC-5, heading out of Hartsfield-Jackson Atlanta Intl. Airport (ATL). You'll be flying for approximately 1h 40m, touching down at Lambert-St. Louis Intl. Airport (STL) at approximately 8:25AM UTC-6.
How long does it take to fly from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL)?
It takes approximately 1 hour and 45 minutes to travel the 480 mi from ATL to STL.
What airline has the least delays from ATL to STL?
With 96% of flights generally arriving on schedule, LATAM Airlines has the best on-time performance for nonstop flights from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL). To check your flight status and get notified if anything changes, simply head to the Expedia App.
What is the best time to fly from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL)?
Choose a flight from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL) that takes off before 3 PM to reduce the risk of cancellations and delays. Later departures have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for St. Louis from Hartsfield-Jackson Atlanta Intl. Airport (ATL)?
If you've booked a direct flight from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to St. Louis, Lambert-St. Louis Intl. Airport (STL) is the only airport you can touch down at.
Is it cheaper to buy a plane ticket from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your plane ticket from ATL to STL right before your journey is usually more expensive. However, if you're flexible with your departure dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book an ATL to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking an ATL to STL flight and hotel package with Expedia could lead to significant savings. What's more, having everything in one place will take the stress out of travel planning. Just pick your flights and select from our wide range of stays, then customize your trip with other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from Hartsfield-Jackson Atlanta Intl. Airport (ATL) to Lambert-St. Louis Intl. Airport (STL)?
Generally, it's possible to reschedule or cancel your ATL to STL flight. However, if it's been more than 24 hours since booking, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more details on our Customer Service portal.

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