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Cheap flights from St. Louis to Rapid City from $185

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Rapid City departing on 10/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to Rapid City

Cheap round-trip flights

United Airlines Logo
1:35 pm - 5:10 pmSTL-RAP
4h 35m1 stop
United Airlines Logo
7:00 am - 12:39 pmRAP-STL
4h 39m1 stop
$249United Airlines
Find Deal
Sat, Dec 13 - Tue, Dec 16
United Airlines Logo
9:00 am - 1:11 pmSTL-RAP
5h 11m1 stop
United Airlines Logo
5:15 am - 3:40 pmRAP-STL
9h 25m2 stops
$254United Airlines
Find Deal
Sat, Dec 13 - Tue, Dec 16
Delta Logo
5:30 pm - 10:14 pmSTL-RAP
5h 44m1 stop
Delta Logo
6:20 am - 4:55 pmRAP-STL
9h 35m2 stops
$333Delta
Find Deal
Sat, Mar 7 - Wed, Mar 11
United Airlines Logo
1:40 pm - 6:40 pmSTL-RAP
6h 00m1 stop
United Airlines Logo
4:35 pm - 11:58 pmRAP-STL
6h 23m1 stop
$336United Airlines
Find Deal
Fri, Oct 10 - Sun, Oct 12
United Airlines Logo
4:30 pm - 8:33 pmSTL-RAP
5h 03m1 stop
United Airlines Logo
7:05 am - 12:43 pmRAP-STL
4h 38m1 stop
$379United Airlines
Find Deal
Sat, Mar 7 - Wed, Mar 11
Delta Logo
5:30 pm - 10:14 pmSTL-RAP
5h 44m1 stop
Delta Logo
10:40 am - 8:57 amRAP-STL
21h 17m2 stops
$395Delta
Find Deal
Sat, Mar 7 - Wed, Mar 11
American Airlines Logo
6:00 am - 9:17 pmSTL-RAP
16h 17m2 stops
American Airlines Logo
1:44 pm - 1:17 pmRAP-STL
22h 33m2 stops
$578American Airlines
Find Deal
Thu, Nov 20 - Wed, Nov 26
Logo
10:17 am - 9:13 amSTL-RAP
23h 56m2 stops
Logo
5:58 pm - 11:43 amRAP-STL
16h 45m1 stop
$610
Find Deal
Thu, Oct 16 - Sun, Oct 19
Logo
7:55 pm - 4:49 pmSTL-RAP
21h 54m2 stops
Logo
5:39 pm - 8:44 pmRAP-STL
26h 05m1 stop
$634
Find Deal
Wed, Sep 24 - Sun, Sep 28
American Airlines Logo
9:36 am - 1:46 pmSTL-RAP
29h 10m1 stop
American Airlines Logo
5:30 am - 7:31 pmRAP-STL
13h 01m2 stops
$888American Airlines
Find Deal
Sat, Dec 20 - Thu, Jan 1

Delta flights from St. Louis to Rapid City

Our best Delta deals on St. Louis to Rapid City flight tickets
Delta
Mar 7
STL5:30 pmLambert-St Louis
5h 44m
1 stop
RAP10:14 pmRapid City
Mar 11
RAP6:20 amRapid City
9h 35m
2 stops
STL4:55 pmLambert-St Louis
$333
Find similar
Delta
Mar 7
STL5:30 pmLambert-St Louis
5h 44m
1 stop
RAP10:14 pmRapid City
Mar 11
RAP10:40 amRapid City
21h 17m
2 stops
STL8:57 amLambert-St Louis
$395
Find similar
Delta
Nov 20
STL6:00 amLambert-St Louis
5h 27m
1 stop
RAP10:27 amRapid City
Nov 26
RAP4:25 pmRapid City
5h 58m
1 stop
STL11:23 pmLambert-St Louis
$398
Find similar

United Airlines flights from St. Louis to Rapid City

Our best United Airlines deals on St. Louis to Rapid City flight tickets
United Airlines
Dec 13
STL1:35 pmLambert-St Louis
4h 35m
1 stop
RAP5:10 pmRapid City
Dec 16
RAP7:00 amRapid City
4h 39m
1 stop
STL12:39 pmLambert-St Louis
$249
Find similar
United Airlines
Dec 13
STL9:00 amLambert-St Louis
5h 11m
1 stop
RAP1:11 pmRapid City
Dec 16
RAP5:15 amRapid City
9h 25m
2 stops
STL3:40 pmLambert-St Louis
$254
Find similar
United Airlines
Oct 10
STL1:40 pmLambert-St Louis
6h 00m
1 stop
RAP6:40 pmRapid City
Oct 12
RAP4:35 pmRapid City
6h 23m
1 stop
STL11:58 pmLambert-St Louis
$336
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Rapid City that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from St. Louis to Rapid City that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Sat 12/13

1:35 pm-5:10 pm

1 stop4h 35m

Rapid City

Tue 12/16

7:00 am-12:39 pm

1 stop4h 39m

$249

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Sat 12/13

9:00 am-1:11 pm

1 stop5h 11m

Rapid City

Tue 12/16

5:15 am-3:40 pm

2 stops9h 25m

$254

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Sat 3/7

5:30 pm-10:14 pm

1 stop5h 44m

Rapid City

Wed 3/11

6:20 am-4:55 pm

2 stops9h 35m

$333

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Fri 10/10

1:40 pm-6:40 pm

1 stop6h 00m

Rapid City

Sun 10/12

4:35 pm-11:58 pm

1 stop6h 23m

$336

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Sat 3/7

4:30 pm-8:33 pm

1 stop5h 03m

Rapid City

Wed 3/11

7:05 am-12:43 pm

1 stop4h 38m

$379

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Sat 3/7

5:30 pm-10:14 pm

1 stop5h 44m

Rapid City

Wed 3/11

10:40 am-8:57 am

2 stops21h 17m

$395

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Thu 11/20

6:00 am-9:17 pm

2 stops16h 17m

Rapid City

Wed 11/26

1:44 pm-1:17 pm

2 stops22h 33m

$578

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Thu 10/16

10:17 am-9:13 am

2 stops23h 56m

Rapid City

Sun 10/19

5:58 pm-11:43 am

1 stop16h 45m

$610

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Wed 9/24

7:55 pm-4:49 pm

2 stops21h 54m

Rapid City

Sun 9/28

5:39 pm-8:44 pm

1 stop26h 05m

$634

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Sat 12/20

9:36 am-1:46 pm

1 stop29h 10m

Rapid City

Thu 1/1

5:30 am-7:31 pm

2 stops13h 01m

$888

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
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See travel insights to Rapid City from

How to get the cheapest flight ticket from St. Louis to Rapid City

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Rapid City?

What is the cheapest month to fly to Rapid City?

The month of November is, on average, the cheapest month to fly to Rapid City from St. Louis, with most prices found around $248. If you aren’t able to travel to Rapid City during the month of November, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $278.

What is the cheapest day to depart on your flight to Rapid City?

According to our data, Friday is the cheapest day to fly to Rapid City from St. Louis. The lowest ticket price found for a Friday departure recently was $363. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Rapid City is Thursday, with ticket prices averaging around $562.

What is the cheapest time of day to depart on your flight to Rapid City?

Our most recent data shows that the best time of day to fly to Rapid City is in the afternoon. Flights from St. Louis to Rapid City during this time can be as low as $403. Flights in the morning are often more expensive with an average ticket price of $473.

How far in advance should I book a flight to Rapid City?

You are more likely to see cheaper flights to Rapid City from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Rapid City for around $372 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Rapid City from St. Louis for as low as $251 on momondo.

When to book flights from St. Louis to Rapid City

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Rapid City according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Rapid City (STL to RAP) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Rapid City

Direct flights

None
There are no direct flights from St. Louis to Rapid City. There are no popular flight routes from St. Louis to Rapid City.
Search flight deals

  • How far is Lambert-St Louis to Rapid City by plane?

    There are 772.0 mi between Lambert-St Louis and Rapid City. Flights usually cover this in 4h 35m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Rapid City Airport?

    Prices for flights from Lambert-St Louis Airport to Rapid City Airport were last updated today.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Rapid City Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Rapid City Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Rapid City Airport.

  • What documentation or ID do you need to fly to Rapid City Airport?

    The necessary travel and health documents for your Rapid City Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Rapid City?

Best airlines flying from St. Louis to Rapid City

Compare and see reviews for airlines that fly from St. Louis to Rapid City with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $248Free CancellationRating
7.9
7,960 reviews
Search Delta flights
American AirlinesPriceFrom $248Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $253Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights

Traveling to a place near Rapid City?

Book flights to Rapid City if you plan to visit one of these locations
Deadwood
Keystone
Sturgis
Spearfish
Custer
Hot Springs
Wall
Hill City

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Rapid City?

It is quick and easy to find St. Louis to Rapid City flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Rapid City that suits you.

Can I find flights from St. Louis to Rapid City with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for St. Louis to Rapid City flights to just show those with flexible booking policies.

How can momondo help me find flights from St. Louis to Rapid City?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Rapid City.

I’m not ready to book a flight from St. Louis to Rapid City right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of St. Louis to Rapid City flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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