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Cheap flights from St. Louis to Rapid City from $240

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 4/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from St. Louis to Rapid City

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
5:35 pm - 10:20 pm
STL
-
RAP
5h 45m
1 stop
Delta Logo
11:10 am - 4:49 pm
RAP
-
STL
4h 39m
1 stop
$269Delta
Sat, May 2 - Sat, May 9
United Airlines Logo
4:30 pm - 8:44 pm
STL
-
RAP
5h 14m
1 stop
United Airlines Logo
5:41 pm - 11:34 pm
RAP
-
STL
4h 53m
1 stop
$274United Airlines
Tue, Mar 3 - Tue, Mar 10
United Airlines Logo
9:55 am - 6:54 pm
STL
-
RAP
9h 59m
2 stops
United Airlines Logo
5:41 pm - 11:34 pm
RAP
-
STL
4h 53m
1 stop
$279United Airlines
Tue, Mar 3 - Tue, Mar 10
United Airlines Logo
5:59 pm - 9:55 pm
STL
-
RAP
4h 56m
1 stop
United Airlines Logo
2:35 pm - 8:43 pm
RAP
-
STL
5h 08m
1 stop
$288United Airlines
Mon, May 4 - Fri, May 15
United Airlines Logo
5:15 am - 9:19 am
STL
-
RAP
5h 04m
1 stop
United Airlines Logo
10:13 am - 4:34 pm
RAP
-
STL
5h 21m
1 stop
$291United Airlines
Thu, Jul 23 - Tue, Jul 28
United Airlines Logo
5:10 am - 9:20 am
STL
-
RAP
5h 10m
1 stop
United Airlines Logo
5:53 pm - 11:57 pm
RAP
-
STL
5h 04m
1 stop
$299United Airlines
Thu, May 28 - Mon, Jun 1
United Airlines Logo
5:15 am - 9:10 am
STL
-
RAP
4h 55m
1 stop
United Airlines Logo
12:00 pm - 10:59 pm
RAP
-
STL
9h 59m
2 stops
$300United Airlines
Fri, Mar 6 - Tue, Mar 10
United Airlines Logo
4:30 pm - 8:34 pm
STL
-
RAP
5h 04m
1 stop
United Airlines Logo
5:41 pm - 11:34 pm
RAP
-
STL
4h 53m
1 stop
$312United Airlines
Tue, Mar 17 - Tue, Mar 24
United Airlines Logo
5:15 am - 9:10 am
STL
-
RAP
4h 55m
1 stop
United Airlines Logo
2:45 pm - 11:34 pm
RAP
-
STL
7h 49m
1 stop
$324United Airlines
Thu, Mar 19 - Thu, Mar 26
United Airlines Logo
11:25 am - 8:34 pm
STL
-
RAP
10h 09m
2 stops
United Airlines Logo
5:41 pm - 11:34 pm
RAP
-
STL
4h 53m
1 stop
$337United Airlines
Tue, Mar 17 - Tue, Mar 24

American Airlines flights from St. Louis to Rapid City

Our best American Airlines deals on St. Louis to Rapid City flight tickets
American Airlines
Mar 17
STL7:00 amLambert-St Louis
7h 51m
1 stop
RAP1:51 pmRapid City
Mar 24
RAP2:21 pmRapid City
8h 01m
1 stop
STL11:22 pmLambert-St Louis
$401
American Airlines
Mar 17
STL7:00 amLambert-St Louis
7h 51m
1 stop
RAP1:51 pmRapid City
Mar 24
RAP2:21 pmRapid City
17h 30m
2 stops
STL8:51 amLambert-St Louis
$417
American Airlines
May 4
STL8:03 pmLambert-St Louis
16h 20m
1 stop
RAP11:23 amRapid City
May 15
RAP4:57 pmRapid City
14h 28m
2 stops
STL8:25 amLambert-St Louis
$514

United Airlines flights from St. Louis to Rapid City

Our best United Airlines deals on St. Louis to Rapid City flight tickets
United Airlines
Mar 3
STL4:30 pmLambert-St Louis
5h 14m
1 stop
RAP8:44 pmRapid City
Mar 10
RAP5:41 pmRapid City
4h 53m
1 stop
STL11:34 pmLambert-St Louis
$274
United Airlines
Mar 3
STL9:55 amLambert-St Louis
9h 59m
2 stops
RAP6:54 pmRapid City
Mar 10
RAP5:41 pmRapid City
4h 53m
1 stop
STL11:34 pmLambert-St Louis
$279
United Airlines
May 4
STL5:59 pmLambert-St Louis
4h 56m
1 stop
RAP9:55 pmRapid City
May 15
RAP2:35 pmRapid City
5h 08m
1 stop
STL8:43 pmLambert-St Louis
$288

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 February 19, 2026.
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 5/2

5:35 pm-10:20 pm

1 stop5h 45m

Rapid City

Sat 5/9

11:10 am-4:49 pm

1 stop4h 39m

$269

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Tue 3/3

4:30 pm-8:44 pm

1 stop5h 14m

Rapid City

Tue 3/10

5:41 pm-11:34 pm

1 stop4h 53m

$274

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Tue 3/3

9:55 am-6:54 pm

2 stops9h 59m

Rapid City

Tue 3/10

5:41 pm-11:34 pm

1 stop4h 53m

$279

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Mon 5/4

5:59 pm-9:55 pm

1 stop4h 56m

Rapid City

Fri 5/15

2:35 pm-8:43 pm

1 stop5h 08m

$288

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Thu 7/23

5:15 am-9:19 am

1 stop5h 04m

Rapid City

Tue 7/28

10:13 am-4:34 pm

1 stop5h 21m

$291

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Thu 5/28

5:10 am-9:20 am

1 stop5h 10m

Rapid City

Mon 6/1

5:53 pm-11:57 pm

1 stop5h 04m

$299

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Fri 3/6

5:15 am-9:10 am

1 stop4h 55m

Rapid City

Tue 3/10

12:00 pm-10:59 pm

2 stops9h 59m

$300

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Tue 3/17

4:30 pm-8:34 pm

1 stop5h 04m

Rapid City

Tue 3/24

5:41 pm-11:34 pm

1 stop4h 53m

$312

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Thu 3/19

5:15 am-9:10 am

1 stop4h 55m

Rapid City

Thu 3/26

2:45 pm-11:34 pm

1 stop7h 49m

$324

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Tue 3/17

11:25 am-8:34 pm

2 stops10h 09m

Rapid City

Tue 3/24

5:41 pm-11:34 pm

1 stop4h 53m

$337

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 18 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 February is, on average, the cheapest month to fly to Rapid City from St. Louis, with most prices found around $289. If you aren’t able to travel to Rapid City during the month of February, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $293.

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 $355 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

Fastest flight time

4h 56m

Direct flights

None
The fastest flight from St. Louis to Rapid City takes 4h 56m
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 56m, 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
8,212 reviews
Search Delta flights
American AirlinesPriceFrom $248Free CancellationRating
7.2
11,313 reviews
Search American Airlines flights
United AirlinesPriceFrom $253Free CancellationRating
7.4
9,321 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
Hill City
Wall
Hot Springs

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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