$104 Cheap Flights from Raleigh (RDU) to St. Louis (STL)

View $104 flight on Sat, May 24, 2025Opens in a new window

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Find available prices by choosing your travel dates.

Cheap Flights from Raleigh to St. Louis (RDU-STL)

Prices were available within the past 7 days and start at $104 for one-way flights and $208 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tue, Apr 29 - Wed, Apr 30
RDU
Raleigh
STL
St. Louis
$208 Roundtrip, found 4 hours ago
$208
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Tue, Apr 29 from Raleigh to St. Louis, returning Wed, Apr 30, priced at $208 found 4 hours ago
Frontier Airlines
Mon, Apr 28 - Wed, Apr 30
RDU
Raleigh
STL
St. Louis
$218 Roundtrip, found 4 hours ago
$218
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Mon, Apr 28 from Raleigh to St. Louis, returning Wed, Apr 30, priced at $218 found 4 hours ago
Frontier Airlines
Mon, Apr 28 - Thu, May 15
RDU
Raleigh
STL
St. Louis
$220 Roundtrip, found 5 hours ago
$220
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Mon, Apr 28 from Raleigh to St. Louis, returning Thu, May 15, priced at $220 found 5 hours ago
Frontier Airlines
Wed, Jun 4 - Sat, Jun 14
RDU
Raleigh
STL
St. Louis
$221 Roundtrip, found 1 day ago
$221
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Jun 4 from Raleigh to St. Louis, returning Sat, Jun 14, priced at $221 found 1 day ago
Frontier Airlines
Sat, May 24 - Tue, May 27
RDU
Raleigh
STL
St. Louis
$224 Roundtrip, found 6 hours ago
$224
Roundtrip
found 6 hours ago
Select Frontier Airlines flight, departing Sat, May 24 from Raleigh to St. Louis, returning Tue, May 27, priced at $224 found 6 hours ago
Frontier Airlines
Sat, May 3 - Thu, May 22
RDU
Raleigh
STL
St. Louis
$230 Roundtrip, found 9 hours ago
$230
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Sat, May 3 from Raleigh to St. Louis, returning Thu, May 22, priced at $230 found 9 hours ago
American Airlines
Wed, Jun 11 - Sat, Jun 14
RDU
Raleigh
STL
St. Louis
$246 Roundtrip, found 8 hours ago
$246
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Wed, Jun 11 from Raleigh to St. Louis, returning Sat, Jun 14, priced at $246 found 8 hours ago
Southwest Airlines
Wed, May 21 - Wed, May 28
RDU
Raleigh
STL
St. Louis
$248 Roundtrip, found 7 hours ago
$248
Roundtrip
found 7 hours ago
Select Southwest Airlines flight, departing Wed, May 21 from Raleigh to St. Louis, returning Wed, May 28, priced at $248 found 7 hours ago
United
Wed, May 21 - Wed, May 28
RDU
Raleigh
STL
St. Louis
$257 Roundtrip, found 7 hours ago
$257
Roundtrip
found 7 hours ago
Select United flight, departing Wed, May 21 from Raleigh to St. Louis, returning Wed, May 28, priced at $257 found 7 hours ago
Delta
Thu, Jul 31 - Mon, Aug 4
RDU
Raleigh
STL
St. Louis
$257 Roundtrip, found 3 hours ago
$257
Roundtrip
found 3 hours ago
Select Delta flight, departing Thu, Jul 31 from Raleigh to St. Louis, returning Mon, Aug 4, priced at $257 found 3 hours ago
Flights from Raleigh (RDU) to St. Louis (STL)
Origin airport
Raleigh - Durham Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$208
Distance
665 mi

Raleigh to St. Louis Flights

The cheapest times to fly from Raleigh 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 Raleigh to St. Louis are during the month of April. You can find some of the cheapest flights from Raleigh to St. Louis with Expedia's search tool and vast selection of airlines.

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

Sunday is one of the best days to book for cheap flights from Raleigh 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 Raleigh 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 Raleigh to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $104 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 Raleigh 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 Raleigh 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 Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL) cost?
Cheap return flights from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL) start from $257. 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 Southwest Airlines flight leaving RDU on May 21 2025 and touching down at STL. The price was last updated on April 24 2025 and has not changed since.
What is the cheapest month to fly from RDU to STL?
The cheapest flights from RDU 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 Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL)?
You can fly nonstop from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL) on a Southwest Airlines flight.
What is the cheapest airline that flies from RDU to STL?
Fly from RDU to STL with Southwest Airlines. This carrier currently has the cheapest one-way ticket on this route, starting at $129. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from RDU on June 12 2025. Prices were last updated on April 24 2025 and have not changed since.
How many flights per day from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL)?
On average, only 1 nonstop flight departs each day from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL). Need other options? Use Expedia’s filter tool to find flights with layovers and explore a new city along the way.
What are the most popular departure times for flights from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL)?
The 9 AM departures from RDU to STL are typically the busiest. They can also be more expensive. If you want to save on your trip, pick a less crowded time to fly.
What day of the week has the most flights from RDU to STL?
Wednesday offers the most flights from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL). Consider taking off on this day and you’ll have a greater chance of finding a departure that fits your itinerary.
What is the earliest flight from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL)?
The earliest flight departing from Raleigh - Durham Intl. Airport (RDU) is at around 9:05AM UTC-5. Catch this flight and you’ll land at Lambert-St. Louis Intl. Airport (STL) at approximately 10:20AM UTC-6. The total flight duration is 2h 15m.
How long does it take to fly from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL)?
Flights from RDU to STL have an average travel time of 2 hours and 15 minutes. The distance between the two airports is 670 mi.
What is the best time to fly from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL)?
Opt for a flight from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL) that leaves before 3 PM to reduce the likelihood of delays. Departures after this hour are on average 22% more likely to be canceled.**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 Raleigh - Durham Intl. Airport (RDU)?
Browse your flight options from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL). This is the only St. Louis airport you can touch down at if you’re taking a direct flight.
Is it cheaper to buy a plane ticket from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your ticket from RDU to STL just before your trip is usually more expensive. But if you’re flexible with your travel dates and times, you could land a cheap last-minute fare.
Is it cheaper to book a RDU to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking a RDU to STL flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one convenient place takes the hassle out of travel planning. Simply pick your flights and select from our extensive range of hotels, then customize your trip with extras like tours and car rentals.
Can I cancel or change the date of my flight from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL)?
If you booked your RDU to STL flight in the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the type of fare you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for further details.

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