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Cheap flights from Rapid City to St. Louis from $191

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 12/19. 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 Rapid City to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
4:00 pm - 11:10 pmRAP-STL
6h 10m1 stop
Delta Logo
5:30 pm - 10:14 pmSTL-RAP
5h 44m1 stop
$249Delta
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Tue, Mar 3 - Sat, Mar 7
Delta Logo
10:40 am - 11:40 pmRAP-STL
12h 00m2 stops
Delta Logo
5:30 pm - 10:14 pmSTL-RAP
5h 44m1 stop
$254Delta
Find Deal
Tue, Mar 3 - Sat, Mar 7
United Airlines Logo
12:56 pm - 8:46 pmRAP-STL
6h 50m1 stop
United Airlines Logo
5:15 am - 10:57 amSTL-RAP
6h 42m1 stop
$313United Airlines
Find Deal
Thu, Oct 16 - Mon, Oct 20
Multiple Airlines Logo
3:49 pm - 9:07 amRAP-STL
16h 18m2 stops
Multiple Airlines Logo
10:59 pm - 6:50 pmSTL-RAP
20h 51m1 stop
$314Multiple Airlines
Find Deal
Mon, Oct 20 - Fri, Oct 24
Delta Logo
4:34 pm - 11:07 pmRAP-STL
5h 33m1 stop
Delta Logo
5:34 pm - 10:39 pmSTL-RAP
6h 05m1 stop
$324Delta
Find Deal
Thu, Nov 6 - Mon, Nov 10
Delta Logo
4:34 pm - 11:07 pmRAP-STL
5h 33m1 stop
Delta Logo
2:36 pm - 10:39 pmSTL-RAP
9h 03m2 stops
$354Delta
Find Deal
Thu, Nov 6 - Mon, Nov 10
Delta Logo
2:51 pm - 11:40 pmRAP-STL
7h 49m2 stops
Delta Logo
6:00 am - 10:22 amSTL-RAP
5h 22m1 stop
$374Delta
Find Deal
Fri, Dec 5 - Sun, Dec 7
United Airlines Logo
12:56 pm - 8:46 pmRAP-STL
6h 50m1 stop
United Airlines Logo
12:25 pm - 6:40 pmSTL-RAP
7h 15m2 stops
$388United Airlines
Find Deal
Thu, Oct 16 - Mon, Oct 20
United Airlines Logo
5:50 pm - 11:58 pmRAP-STL
5h 08m1 stop
United Airlines Logo
6:30 am - 10:13 amSTL-RAP
4h 43m1 stop
$451United Airlines
Find Deal
Mon, Oct 20 - Fri, Oct 24
United Airlines Logo
8:30 am - 6:57 pmRAP-STL
9h 27m2 stops
United Airlines Logo
12:25 pm - 6:40 pmSTL-RAP
7h 15m2 stops
$500United Airlines
Find Deal
Thu, Oct 16 - Mon, Oct 20

Delta flights from Rapid City to St. Louis

Our best Delta deals on Rapid City to St. Louis flight tickets
Delta
Mar 3
RAP4:00 pmRapid City
6h 10m
1 stop
STL11:10 pmLambert-St Louis
Mar 7
STL5:30 pmLambert-St Louis
5h 44m
1 stop
RAP10:14 pmRapid City
$249
Find similar
Delta
Mar 3
RAP10:40 amRapid City
12h 00m
2 stops
STL11:40 pmLambert-St Louis
Mar 7
STL5:30 pmLambert-St Louis
5h 44m
1 stop
RAP10:14 pmRapid City
$254
Find similar
Delta
Nov 6
RAP4:34 pmRapid City
5h 33m
1 stop
STL11:07 pmLambert-St Louis
Nov 10
STL5:34 pmLambert-St Louis
6h 05m
1 stop
RAP10:39 pmRapid City
$324
Find similar

United Airlines flights from Rapid City to St. Louis

Our best United Airlines deals on Rapid City to St. Louis flight tickets
United Airlines
Oct 16
RAP12:56 pmRapid City
6h 50m
1 stop
STL8:46 pmLambert-St Louis
Oct 20
STL5:15 amLambert-St Louis
6h 42m
1 stop
RAP10:57 amRapid City
$313
Find similar
United Airlines
Oct 3
RAP3:20 pmRapid City
4h 26m
1 stop
STL8:46 pmLambert-St Louis
Oct 5
STL5:15 amLambert-St Louis
4h 55m
1 stop
RAP9:10 amRapid City
$339
Find similar
United Airlines
Oct 3
RAP7:00 amRapid City
10h 57m
2 stops
STL6:57 pmLambert-St Louis
Oct 5
STL5:00 amLambert-St Louis
6h 13m
1 stop
RAP10:13 amRapid City
$344
Find similar

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 October 2, 2025.
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

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Tue 3/3

4:00 pm-11:10 pm

1 stop6h 10m

Lambert-St Louis

Sat 3/7

5:30 pm-10:14 pm

1 stop5h 44m

$249

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Tue 3/3

10:40 am-11:40 pm

2 stops12h 00m

Lambert-St Louis

Sat 3/7

5:30 pm-10:14 pm

1 stop5h 44m

$254

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 10/16

12:56 pm-8:46 pm

1 stop6h 50m

Lambert-St Louis

Mon 10/20

5:15 am-10:57 am

1 stop6h 42m

$313

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Mon 10/20

3:49 pm-9:07 am

2 stops16h 18m

Lambert-St Louis

Fri 10/24

10:59 pm-6:50 pm

1 stop20h 51m

$314

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 11/6

4:34 pm-11:07 pm

1 stop5h 33m

Lambert-St Louis

Mon 11/10

5:34 pm-10:39 pm

1 stop6h 05m

$324

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 11/6

4:34 pm-11:07 pm

1 stop5h 33m

Lambert-St Louis

Mon 11/10

2:36 pm-10:39 pm

2 stops9h 03m

$354

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Fri 12/5

2:51 pm-11:40 pm

2 stops7h 49m

Lambert-St Louis

Sun 12/7

6:00 am-10:22 am

1 stop5h 22m

$374

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 10/16

12:56 pm-8:46 pm

1 stop6h 50m

Lambert-St Louis

Mon 10/20

12:25 pm-6:40 pm

2 stops7h 15m

$388

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Mon 10/20

5:50 pm-11:58 pm

1 stop5h 08m

Lambert-St Louis

Fri 10/24

6:30 am-10:13 am

1 stop4h 43m

$451

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 10/16

8:30 am-6:57 pm

2 stops9h 27m

Lambert-St Louis

Mon 10/20

12:25 pm-6:40 pm

2 stops7h 15m

$500

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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, December 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 $299. The month of June is another great option to travel to St. Louis, with average flight prices from Rapid City averaging around $344.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Monday when prices can be found for as low as $315. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $408. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Rapid City in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $343 when looking at flights departing in the afternoon. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $509 per ticket.

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

Direct flights

None
There are no direct flights from Rapid City to St. Louis. There are no popular flight routes from Rapid City to St. Louis.
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  • 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 5h 08m.

  • 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 $248Free CancellationRating
7.9
7,962 reviews
Search Delta flights
United AirlinesPriceFrom $264Free CancellationRating
7.4
8,933 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
Florissant
Maryland Heights
O'Fallon
Collinsville
Fenton
Wentzville
St. Peters
Alton
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
Shrewsbury

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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