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Cheap flights from Rapid City to St. Louis from $181

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Rapid City to St. Louis departing on 5/20. 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 Rapid City to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
10:55 am - 4:57 pm
RAP
-
STL
5h 02m
1 stop
United Airlines Logo
5:29 pm - 9:37 pm
STL
-
RAP
5h 08m
1 stop
$329United Airlines
Wed, May 20 - Wed, May 27
American Airlines Logo
1:08 pm - 7:30 pm
RAP
-
STL
5h 22m
1 stop
American Airlines Logo
5:20 am - 12:38 pm
STL
-
RAP
8h 18m
1 stop
$339American Airlines
Sat, May 2 - Wed, May 6
United Airlines Logo
8:25 am - 2:28 pm
RAP
-
STL
5h 03m
1 stop
United Airlines Logo
7:45 am - 2:51 pm
STL
-
RAP
8h 06m
2 stops
$344United Airlines
Sat, May 2 - Wed, May 6
American Airlines Logo
5:01 pm - 11:58 pm
RAP
-
STL
5h 57m
1 stop
American Airlines Logo
5:29 am - 9:49 am
STL
-
RAP
5h 20m
1 stop
$376American Airlines
Sat, May 30 - Fri, Jun 5
United Airlines Logo
1:35 pm - 7:23 pm
RAP
-
STL
4h 48m
1 stop
United Airlines Logo
6:00 am - 10:24 am
STL
-
RAP
5h 24m
1 stop
$409United Airlines
Sat, May 23 - Wed, May 27
United Airlines Logo
1:35 pm - 7:23 pm
RAP
-
STL
4h 48m
1 stop
United Airlines Logo
8:00 am - 7:13 pm
STL
-
RAP
12h 13m
2 stops
$414United Airlines
Sat, May 23 - Wed, May 27
Delta Logo
4:33 pm - 11:21 pm
RAP
-
STL
5h 48m
1 stop
Delta Logo
6:45 am - 3:48 pm
STL
-
RAP
10h 03m
2 stops
$419Delta
Wed, May 13 - Tue, May 19
American Airlines Logo
5:00 pm - 11:58 pm
RAP
-
STL
5h 58m
1 stop
American Airlines Logo
5:29 am - 9:49 am
STL
-
RAP
5h 20m
1 stop
$423American Airlines
Mon, Jun 1 - Fri, Jun 5
United Airlines Logo
1:00 pm - 11:19 pm
RAP
-
STL
9h 19m
2 stops
United Airlines Logo
7:45 am - 3:55 pm
STL
-
RAP
9h 10m
2 stops
$429United Airlines
Sat, May 2 - Wed, May 6
Delta Logo
10:58 am - 8:44 pm
RAP
-
STL
8h 46m
2 stops
Delta Logo
6:00 am - 3:48 pm
STL
-
RAP
10h 48m
2 stops
$440Delta
Wed, May 6 - Sun, May 10

Delta flights from Rapid City to St. Louis

Our best Delta deals on Rapid City to St. Louis flight tickets
Delta
May 6
RAP6:00 amRapid City
4h 32m
1 stop
STL11:32 amLambert-St Louis
May 10
STL6:21 amLambert-St Louis
5h 11m
1 stop
RAP10:32 amRapid City
$339
Delta
May 6
RAP6:00 amRapid City
4h 32m
1 stop
STL11:32 amLambert-St Louis
May 10
STL6:00 amLambert-St Louis
10h 48m
2 stops
RAP3:48 pmRapid City
$344
Delta
May 13
RAP4:33 pmRapid City
5h 48m
1 stop
STL11:21 pmLambert-St Louis
May 19
STL6:45 amLambert-St Louis
10h 03m
2 stops
RAP3:48 pmRapid City
$419

United Airlines flights from Rapid City to St. Louis

Our best United Airlines deals on Rapid City to St. Louis flight tickets
United Airlines
May 20
RAP10:55 amRapid City
5h 02m
1 stop
STL4:57 pmLambert-St Louis
May 27
STL5:29 pmLambert-St Louis
5h 08m
1 stop
RAP9:37 pmRapid City
$329
United Airlines
May 23
RAP1:35 pmRapid City
4h 48m
1 stop
STL7:23 pmLambert-St Louis
May 27
STL8:00 amLambert-St Louis
12h 13m
2 stops
RAP7:13 pmRapid City
$414
United Airlines
May 14
RAP2:35 pmRapid City
5h 08m
1 stop
STL8:43 pmLambert-St Louis
May 15
STL5:59 pmLambert-St Louis
4h 56m
1 stop
RAP9:55 pmRapid City
$520

momondo Fare Finder

 
Customize your flight search to find flights from Rapid City to St. Louis 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 April 23, 2026.
Use the filters below to find and compare flights from Rapid City to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 5/20

10:55 am-4:57 pm

1 stop5h 02m

Lambert-St Louis

Wed 5/27

5:29 pm-9:37 pm

1 stop5h 08m

$329

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sat 5/2

1:08 pm-7:30 pm

1 stop5h 22m

Lambert-St Louis

Wed 5/6

5:20 am-12:38 pm

1 stop8h 18m

$339

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sat 5/2

8:25 am-2:28 pm

1 stop5h 03m

Lambert-St Louis

Wed 5/6

7:45 am-2:51 pm

2 stops8h 06m

$344

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sat 5/30

5:01 pm-11:58 pm

1 stop5h 57m

Lambert-St Louis

Fri 6/5

5:29 am-9:49 am

1 stop5h 20m

$376

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sat 5/23

1:35 pm-7:23 pm

1 stop4h 48m

Lambert-St Louis

Wed 5/27

6:00 am-10:24 am

1 stop5h 24m

$409

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sat 5/23

1:35 pm-7:23 pm

1 stop4h 48m

Lambert-St Louis

Wed 5/27

8:00 am-7:13 pm

2 stops12h 13m

$414

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 5/13

4:33 pm-11:21 pm

1 stop5h 48m

Lambert-St Louis

Tue 5/19

6:45 am-3:48 pm

2 stops10h 03m

$419

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Mon 6/1

5:00 pm-11:58 pm

1 stop5h 58m

Lambert-St Louis

Fri 6/5

5:29 am-9:49 am

1 stop5h 20m

$423

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sat 5/2

1:00 pm-11:19 pm

2 stops9h 19m

Lambert-St Louis

Wed 5/6

7:45 am-3:55 pm

2 stops9h 10m

$429

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 5/6

10:58 am-8:44 pm

2 stops8h 46m

Lambert-St Louis

Sun 5/10

6:00 am-3:48 pm

2 stops10h 48m

$440

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

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

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 Rapid City and St. Louis?

What is the cheapest month to fly to St. Louis?

In general, January is the cheapest month to fly from Rapid City to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $243. The month of June is another great option to travel to St. Louis, with average flight prices from Rapid City averaging around $344.

When to book flights from Rapid City to St. Louis

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

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

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

Fastest flight time

4h 33m

Direct flights

None
The fastest flight from Rapid City to St. Louis takes 4h 33m
There are no direct flights from Rapid City to St. Louis. There are no popular flight routes from Rapid City to St. Louis.
Search flight deals

Frequently asked questions about flying from Rapid City to St. Louis

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

    A flight from Rapid City to Lambert-St Louis will travel around 772.0 mi. In terms of flight time, this usually takes a little over 4h 33m.

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

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

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Rapid City Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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

Best airlines flying from Rapid City to St. Louis

Compare and see reviews for airlines that fly from Rapid City to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $174Free CancellationRating
7.9
8,438 reviews
Search Delta flights
United AirlinesPriceFrom $257Free CancellationRating
7.4
9,637 reviews
Search United Airlines flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
St. Peters
Collinsville
Wentzville
Alton
Fenton
Farmington
Festus
Clayton
Eureka
Litchfield
Edwardsville
Shrewsbury
Grafton

Why use momondo?

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

It is quick and easy to find Rapid City to St. Louis 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 St. Louis that suits you.

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

Flights from Rapid City to St. Louis with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo helps you find the best flight between Rapid City and St. Louis by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Of course. momondo tracks the price of Rapid City to St. Louis 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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