$191 Cheap Flights from St. Louis (STL) to Rapid City (RAP)

View $191 flight on Tue, Mar 24, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Rapid City Regional Airport (RAP)

Cheap Flights from St. Louis to Rapid City (STL-RAP)

Prices were available within the past 7 days and start at $191 for one-way flights and $249 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Mon, Oct 27 - Sat, Nov 1
STL
St. Louis
RAP
Rapid City
$249 Roundtrip, found 4 days ago
$249
Roundtrip
found 4 days ago
Select American Airlines flight, departing Mon, Oct 27 from St. Louis to Rapid City, returning Sat, Nov 1, priced at $249 found 4 days ago
Delta
Sat, Nov 1 - Mon, Nov 3
STL
St. Louis
RAP
Rapid City
$249 Roundtrip, found 1 day ago
$249
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Nov 1 from St. Louis to Rapid City, returning Mon, Nov 3, priced at $249 found 1 day ago
American Airlines
Thu, Oct 23 - Tue, Oct 28
STL
St. Louis
RAP
Rapid City
$254 Roundtrip, found 1 day ago
$254
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Oct 23 from St. Louis to Rapid City, returning Tue, Oct 28, priced at $254 found 1 day ago
Delta
Sun, Mar 29 - Tue, Apr 14
STL
St. Louis
RAP
Rapid City
$254 Roundtrip, found 6 days ago
$254
Roundtrip
found 6 days ago
Select Delta flight, departing Sun, Mar 29 from St. Louis to Rapid City, returning Tue, Apr 14, priced at $254 found 6 days ago
United
Wed, Oct 22 - Sat, Oct 25
STL
St. Louis
RAP
Rapid City
$259 Roundtrip, found 3 days ago
$259
Roundtrip
found 3 days ago
Select United flight, departing Wed, Oct 22 from St. Louis to Rapid City, returning Sat, Oct 25, priced at $259 found 3 days ago
United
Wed, Oct 22 - Sat, Oct 25
STL
St. Louis
RAP
Rapid City
$264 Roundtrip, found 3 days ago
$264
Roundtrip
found 3 days ago
Select United flight, departing Wed, Oct 22 from St. Louis to Rapid City, returning Sat, Oct 25, priced at $264 found 3 days ago
Delta
Fri, Apr 10 - Sat, Apr 18
STL
St. Louis
RAP
Rapid City
$269 Roundtrip, found 1 day ago
$269
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Apr 10 from St. Louis to Rapid City, returning Sat, Apr 18, priced at $269 found 1 day ago
United
Sat, Dec 6 - Sat, Dec 13
STL
St. Louis
RAP
Rapid City
$270 Roundtrip, found 2 days ago
$270
Roundtrip
found 2 days ago
Select United flight, departing Sat, Dec 6 from St. Louis to Rapid City, returning Sat, Dec 13, priced at $270 found 2 days ago
United
Mon, Oct 27 - Sat, Nov 1
STL
St. Louis
RAP
Rapid City
$271 Roundtrip, found 4 days ago
$271
Roundtrip
found 4 days ago
Select United flight, departing Mon, Oct 27 from St. Louis to Rapid City, returning Sat, Nov 1, priced at $271 found 4 days ago
Delta
Mon, Oct 27 - Sat, Nov 1
STL
St. Louis
RAP
Rapid City
$274 Roundtrip, found 4 days ago
$274
Roundtrip
found 4 days ago
Select Delta flight, departing Mon, Oct 27 from St. Louis to Rapid City, returning Sat, Nov 1, priced at $274 found 4 days ago

Find the cheapest month to fly from St. Louis (STL) to Rapid City (RAP)

September is typically the cheapest month to fly

From $248 - $457 per traveler.

Alternative airports near Rapid City

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

Select flight to Rapid City Regional RAP. Cheapest and Closest option available. Average driving time to city center is 16 minutes. Flights from $455
RAP
Rapid City Regional
CheapestClosest
Average driving time to city center16 min
Flights from $455

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Rapid City Regional Airport (RAP) cost?
Secure a cheap one-way flight from $191 or cheap return flight from $249 from Lambert-St. Louis Intl. Airport (STL) to Rapid City Regional Airport (RAP) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Rapid City Regional Airport (RAP)?
October is the cheapest month to fly from STL to RAP. Planning your trip for the off-season is often the key to landing a great deal.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Rapid City Regional Airport (RAP)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest STL to RAP flight.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Rapid City Regional Airport (RAP)?
You'll need to catch a flight with a layover if you're traveling from Lambert-St. Louis Intl. Airport (STL) to Rapid City Regional Airport (RAP). There are no daily direct flights on this route. However, just filter your search to include one or more stops to discover the best option for your trip.
What day of the week has the most flights from STL to RAP?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can change depending on a number of factors, including the carrier and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Rapid City Regional Airport (RAP)?
Book a flight from Lambert-St. Louis Intl. Airport (STL) to Rapid City Regional Airport (RAP) that leaves before 3 PM to reduce the risk of cancellations. Departures later than this 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.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Rapid City Regional Airport (RAP) last-minute?
Holding off until just before your departure to book a ticket from STL to RAP generally means paying more. While it's possible to find some last-minute offers, they aren't always guaranteed. Keep your travel schedule open for a better chance of snagging a bargain.
Is it cheaper to book a STL to RAP flight and hotel package?
You'll typically save money by booking a STL to RAP flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. After choosing your ideal accommodations and flights, consider adding extras such as activities, tours and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Rapid City Regional Airport (RAP)?
Typically, you're able to reschedule or cancel your STL to RAP flight. However, additional fees may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline's policies and fees on flight changes, or if you'd like more information, head to our Customer Service portal.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Rapid City Regional
Airlines serving
American Airlines, Delta, United
Roundtrip price
$248
Distance
751 mi

Book with confidence

Book with confidence

St. Louis to Rapid City Flights

The cheapest times to fly from St. Louis to Rapid City

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 St. Louis to Rapid City are during the month of October. You can find some of the cheapest flights from St. Louis to Rapid City with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Rapid City

Sunday is one of the best days to book for cheap flights from St. Louis to Rapid City: 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 St. Louis to Rapid City

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 St. Louis to Rapid City in 2025. You can also book with separate airlines for your outbound and return journeys, from $191 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 St. Louis to Rapid City 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 St. Louis to Rapid City 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.

 

St. Louis to Rapid City Flights

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Explore a world of travel with Expedia

*Available to One Key members.