What is the cheapest airline that flies from Rapid City to Lambert-St Louis?

American Airlines and Delta are the most popular carriers operating from Rapid City to Lambert-St Louis

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?

As of August 2025, there are 2 operators available to choose from 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.

$175 Cheap Flights from Rapid City to St. Louis (RAP-STL) in 2025

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Find the cheapest flights from Rapid City to St. Louis (RAP-STL)

Round-trip

One-way

Last minute

Cheap round-trip flights

4:24 pm - 11:09 pmRAP-STL

5h 45m1 stop

6:00 am - 10:12 amSTL-RAP

5h 12m1 stop

$249Delta

Find Deal

Thu, Sep 25 - Sun, Sep 28

4:25 pm - 11:23 pmRAP-STL

5h 58m1 stop

7:03 pm - 10:32 pmSTL-RAP

4h 29m1 stop

$259Delta

Find Deal

Thu, Aug 21 - Mon, Aug 25

4:24 pm - 11:09 pmRAP-STL

5h 45m1 stop

5:32 pm - 10:30 pmSTL-RAP

5h 58m1 stop

$274Delta

Find Deal

Wed, Sep 17 - Wed, Sep 24

5:30 am - 2:32 pmRAP-STL

8h 02m2 stops

9:00 am - 12:38 pmSTL-RAP

4h 38m1 stop

$289United Airlines

Find Deal

Thu, Aug 21 - Mon, Aug 25

5:30 am - 3:44 pmRAP-STL

9h 14m2 stops

1:10 pm - 9:59 pmSTL-RAP

9h 49m2 stops

$364United Airlines

Find Deal

Thu, Aug 21 - Mon, Aug 25

7:00 am - 8:46 pmRAP-STL

12h 46m1 stop

5:15 am - 9:06 amSTL-RAP

4h 51m1 stop

$400United Airlines

Find Deal

Wed, Sep 17 - Wed, Sep 24

4:24 pm - 11:09 pmRAP-STL

5h 45m1 stop

2:15 pm - 10:30 pmSTL-RAP

9h 15m2 stops

$403Delta

Find Deal

Wed, Sep 17 - Wed, Sep 24

5:00 pm - 10:50 pmRAP-STL

4h 50m1 stop

7:23 am - 8:53 pmSTL-RAP

14h 30m2 stops

$410American Airlines

Find Deal

Wed, Sep 17 - Wed, Sep 24

11:00 am - 9:15 pmRAP-STL

9h 15m2 stops

6:01 am - 3:43 pmSTL-RAP

10h 42m2 stops

$558Delta

Find Deal

Thu, Sep 25 - Sun, Sep 28

6:00 am - 9:53 pmRAP-STL

14h 53m2 stops

7:23 am - 8:53 pmSTL-RAP

14h 30m2 stops

$665American Airlines

Find Deal

Wed, Sep 17 - Wed, Sep 24

United Airlines flights from Rapid City to St. Louis

Our best United Airlines deals on Rapid City to St. Louis flight tickets

United Airlines

Aug 21

RAP5:30 amRapid City

8h 02m

2 stops

STL2:32 pmLambert-St Louis

Aug 25

STL9:00 amLambert-St Louis

4h 38m

1 stop

RAP12:38 pmRapid City

$289

Find similar

United Airlines

Aug 14

RAP1:43 pmRapid City

4h 48m

1 stop

STL7:31 pmLambert-St Louis

Aug 21

STL5:15 amLambert-St Louis

4h 51m

1 stop

RAP9:06 amRapid City

$359

Find similar

United Airlines

Aug 21

RAP5:30 amRapid City

9h 14m

2 stops

STL3:44 pmLambert-St Louis

Aug 25

STL1:10 pmLambert-St Louis

9h 49m

2 stops

RAP9:59 pmRapid City

$364

Find similar

Delta flights from Rapid City to St. Louis

Our best Delta deals on Rapid City to St. Louis flight tickets

Delta

Sep 25

RAP4:24 pmRapid City

5h 45m

1 stop

STL11:09 pmLambert-St Louis

Sep 28

STL6:00 amLambert-St Louis

5h 12m

1 stop

RAP10:12 amRapid City

$249

Find similar

Delta

Aug 21

RAP4:25 pmRapid City

5h 58m

1 stop

STL11:23 pmLambert-St Louis

Aug 25

STL7:03 pmLambert-St Louis

4h 29m

1 stop

RAP10:32 pmRapid City

$259

Find similar

Delta

Sep 17

RAP4:24 pmRapid City

5h 45m

1 stop

STL11:09 pmLambert-St Louis

Sep 24

STL5:32 pmLambert-St Louis

5h 58m

1 stop

RAP10:30 pmRapid City

$274

Find similar

Fly from

Fly to

Route

Depart

Return

Price

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 9/25

4:24 pm-11:09 pm

1 stop5h 45m

Lambert-St Louis

Sun 9/28

6:00 am-10:12 am

1 stop5h 12m

$249

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 8/21

4:25 pm-11:23 pm

1 stop5h 58m

Lambert-St Louis

Mon 8/25

7:03 pm-10:32 pm

1 stop4h 29m

$259

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 9/17

4:24 pm-11:09 pm

1 stop5h 45m

Lambert-St Louis

Wed 9/24

5:32 pm-10:30 pm

1 stop5h 58m

$274

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 8/21

5:30 am-2:32 pm

2 stops8h 02m

Lambert-St Louis

Mon 8/25

9:00 am-12:38 pm

1 stop4h 38m

$289

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 8/21

5:30 am-3:44 pm

2 stops9h 14m

Lambert-St Louis

Mon 8/25

1:10 pm-9:59 pm

2 stops9h 49m

$364

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 9/17

7:00 am-8:46 pm

1 stop12h 46m

Lambert-St Louis

Wed 9/24

5:15 am-9:06 am

1 stop4h 51m

$400

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 9/17

4:24 pm-11:09 pm

1 stop5h 45m

Lambert-St Louis

Wed 9/24

2:15 pm-10:30 pm

2 stops9h 15m

$403

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 9/17

5:00 pm-10:50 pm

1 stop4h 50m

Lambert-St Louis

Wed 9/24

7:23 am-8:53 pm

2 stops14h 30m

$410

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 9/25

11:00 am-9:15 pm

2 stops9h 15m

Lambert-St Louis

Sun 9/28

6:01 am-3:43 pm

2 stops10h 42m

$558

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 9/17

6:00 am-9:53 pm

2 stops14h 53m

Lambert-St Louis

Wed 9/24

7:23 am-8:53 pm

2 stops14h 30m

$665

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first

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

Prices

Airlines

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

Best Price Found	$175
Fastest flight time	4h 50m
Direct flights	None
Airports in St. Louis	1 airport

The best one-way flight to St. Louis from Rapid City in the past 72 hours is $175. The best round-trip flight deal from Rapid City to St. Louis found on momondo in the last 72 hours is $249.

The fastest flight from Rapid City to St. Louis takes 4h 50m

There are no direct flights from Rapid City to St. Louis. Popular non-direct route for this connection is Rapid City Airport - Lambert-St Louis Airport.

There is 1 airport near St. Louis: Lambert-St Louis (STL)

Search flight deals

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 50m.
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?
As of August 2025, there are 2 operators available to choose from 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?
Based on momondo bookings for flights between Rapid City and St. Louis, the leading airline is United Airlines, making up 71% of the total bookings. Other popular airlines include Delta with 29%.

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
Delta	PriceFrom $248	Free Cancellation	Rating 8.0 7,985 reviews		Search Delta flights
United Airlines	PriceFrom $299	Free Cancellation	Rating 7.4 8,917 reviews		Search United Airlines flights

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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.