$80 Cheap Flights from Raleigh (RDU) to St. Louis (STL)

View $80 flight on Sun, Oct 12, 2025Opens in a new window

Popular airlines from Raleigh-Durham International Airport (RDU) to St. Louis Lambert Intl. Airport (STL)

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

Prices were available within the past 7 days and start at $80 for one-way flights and $160 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sun, Sep 14 - Thu, Sep 18
RDU
Raleigh
STL
St. Louis
$160 Roundtrip, just found
$160
Roundtrip
just found
Select Frontier Airlines flight, departing Sun, Sep 14 from Raleigh to St. Louis, returning Thu, Sep 18, priced at $160 just found
Frontier Airlines
Thu, Oct 23 - Fri, Oct 31
RDU
Raleigh
STL
St. Louis
$163 Roundtrip, found 4 days ago
$163
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Thu, Oct 23 from Raleigh to St. Louis, returning Fri, Oct 31, priced at $163 found 4 days ago
Frontier Airlines
Fri, Oct 24 - Mon, Oct 27
RDU
Raleigh
STL
St. Louis
$166 Roundtrip, found 6 days ago
$166
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Fri, Oct 24 from Raleigh to St. Louis, returning Mon, Oct 27, priced at $166 found 6 days ago
Frontier Airlines
Fri, Oct 24 - Wed, Oct 29
RDU
Raleigh
STL
St. Louis
$171 Roundtrip, found 1 hour ago
$171
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Fri, Oct 24 from Raleigh to St. Louis, returning Wed, Oct 29, priced at $171 found 1 hour ago
Frontier Airlines
Thu, Oct 16 - Sun, Oct 19
RDU
Raleigh
STL
St. Louis
$182 Roundtrip, found 8 hours ago
$182
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Thu, Oct 16 from Raleigh to St. Louis, returning Sun, Oct 19, priced at $182 found 8 hours ago
Frontier Airlines
Mon, Oct 6 - Thu, Oct 9
RDU
Raleigh
STL
St. Louis
$184 Roundtrip, found 5 days ago
$184
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Mon, Oct 6 from Raleigh to St. Louis, returning Thu, Oct 9, priced at $184 found 5 days ago
Spirit Airlines
Thu, Aug 28 - Thu, Sep 18
RDU
Raleigh
STL
St. Louis
$203 Roundtrip, found 5 days ago
$203
Roundtrip
found 5 days ago
Select Spirit Airlines flight, departing Thu, Aug 28 from Raleigh to St. Louis, returning Thu, Sep 18, priced at $203 found 5 days ago
Delta
Tue, Sep 16 - Thu, Sep 18
RDU
Raleigh
STL
St. Louis
$234 Roundtrip, found 1 hour ago
$234
Roundtrip
found 1 hour ago
Select Delta flight, departing Tue, Sep 16 from Raleigh to St. Louis, returning Thu, Sep 18, priced at $234 found 1 hour ago
American Airlines
Wed, Sep 17 - Mon, Sep 29
RDU
Raleigh
STL
St. Louis
$292 Roundtrip, found 2 days ago
$292
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, Sep 17 from Raleigh to St. Louis, returning Mon, Sep 29, priced at $292 found 2 days ago
Southwest Airlines
Wed, Oct 1 - Tue, Oct 7
RDU
Raleigh
STL
St. Louis
$297 Roundtrip, found 10 hours ago
$297
Roundtrip
found 10 hours ago
Select Southwest Airlines flight, departing Wed, Oct 1 from Raleigh to St. Louis, returning Tue, Oct 7, priced at $297 found 10 hours ago

Find the cheapest month to fly from Raleigh (RDU) to St. Louis (STL)

November is typically the cheapest month to fly

From $148 - $426 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 $160
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $160
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, Spirit Airlines, United
Roundtrip price
$160
Distance
665 mi
Average flight time
1 hour 5 mins

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 September. 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 $80 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?
Lock in a cheap one-way flight from $80 or cheap return flight from $160 from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL)?
September is the least expensive month to fly from RDU to STL. Avoiding peak travel times is often the key to finding better fares.
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 Raleigh - Durham Intl. Airport (RDU) to Lambert-St. Louis Intl. Airport (STL)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest RDU to STL flight.
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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