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

United 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 December 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.

$191 Cheap Flights from Rapid City to St. Louis in 2025/26

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

Prices are currently low for flights on this route. Typical prices usually range from $355 to $411. The lowest price recently found on this route was $209.

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Find the cheapest flights from Rapid City to St. Louis

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:10 pm - 11:25 pm

RAP

STL

6h 15m1 stop

11:23 am - 3:25 pm

STL

RAP

5h 02m1 stop

$209Delta

Thu, Jan 15 - Sat, Jan 17

10:54 am - 4:45 pm

RAP

STL

4h 51m1 stop

6:10 am - 10:13 am

STL

RAP

5h 03m1 stop

$269Delta

Wed, Jan 7 - Sat, Jan 10

10:54 am - 4:45 pm

RAP

STL

4h 51m1 stop

6:35 am - 3:25 pm

STL

RAP

9h 50m2 stops

$274Delta

Wed, Jan 14 - Wed, Jan 21

3:35 pm - 10:22 pm

RAP

STL

5h 47m1 stop

2:45 pm - 7:12 pm

STL

RAP

5h 27m1 stop

$279United Airlines

Thu, Jan 1 - Mon, Jan 5

2:40 pm - 8:58 pm

RAP

STL

5h 18m1 stop

7:00 am - 5:12 pm

STL

RAP

11h 12m2 stops

$284United Airlines

Thu, Jan 15 - Sat, Jan 17

12:35 pm - 9:13 pm

RAP

STL

7h 38m2 stops

9:57 am - 5:12 pm

STL

RAP

8h 15m2 stops

$301United Airlines

Wed, Jan 14 - Wed, Jan 21

3:35 pm - 10:22 pm

RAP

STL

5h 47m1 stop

3:10 pm - 9:59 pm

STL

RAP

7h 49m2 stops

$332United Airlines

Thu, Jan 1 - Mon, Jan 5

5:10 am - 1:16 pm

RAP

STL

7h 06m1 stop

4:15 pm - 8:32 pm

STL

RAP

5h 17m1 stop

$339United Airlines

Tue, Feb 3 - Sat, Feb 7

12:35 pm - 8:58 pm

RAP

STL

7h 23m1 stop

9:57 am - 8:32 pm

STL

RAP

11h 35m2 stops

$344United Airlines

Tue, Feb 3 - Sat, Feb 7

5:10 am - 2:30 pm

RAP

STL

8h 20m2 stops

8:05 am - 7:14 pm

STL

RAP

12h 09m2 stops

$349United Airlines

Tue, Feb 3 - Sat, Feb 7

Delta flights from Rapid City to St. Louis

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

Delta

Jan 15

RAP4:10 pmRapid City

6h 15m

1 stop

STL11:25 pmLambert-St Louis

Jan 17

STL11:23 amLambert-St Louis

5h 02m

1 stop

RAP3:25 pmRapid City

$209

Find similar

Delta

Jan 7

RAP10:54 amRapid City

4h 51m

1 stop

STL4:45 pmLambert-St Louis

Jan 10

STL6:10 amLambert-St Louis

5h 03m

1 stop

RAP10:13 amRapid City

$269

Find similar

Delta

Jan 14

RAP10:54 amRapid City

4h 51m

1 stop

STL4:45 pmLambert-St Louis

Jan 21

STL6:35 amLambert-St Louis

9h 50m

2 stops

RAP3:25 pmRapid City

$274

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

Jan 1

RAP3:35 pmRapid City

5h 47m

1 stop

STL10:22 pmLambert-St Louis

Jan 5

STL2:45 pmLambert-St Louis

5h 27m

1 stop

RAP7:12 pmRapid City

$279

Find similar

United Airlines

Jan 15

RAP2:40 pmRapid City

5h 18m

1 stop

STL8:58 pmLambert-St Louis

Jan 17

STL7:00 amLambert-St Louis

11h 12m

2 stops

RAP5:12 pmRapid City

$284

Find similar

United Airlines

Jan 14

RAP12:35 pmRapid City

7h 38m

2 stops

STL9:13 pmLambert-St Louis

Jan 21

STL9:57 amLambert-St Louis

8h 15m

2 stops

RAP5:12 pmRapid City

$301

Find similar

Fly from

Fly to

Route

Depart

Return

Price

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 1/15

4:10 pm-11:25 pm

1 stop6h 15m

Lambert-St Louis

Sat 1/17

11:23 am-3:25 pm

1 stop5h 02m

$209

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 1/7

10:54 am-4:45 pm

1 stop4h 51m

Lambert-St Louis

Sat 1/10

6:10 am-10:13 am

1 stop5h 03m

$269

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 1/14

10:54 am-4:45 pm

1 stop4h 51m

Lambert-St Louis

Wed 1/21

6:35 am-3:25 pm

2 stops9h 50m

$274

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 1/1

3:35 pm-10:22 pm

1 stop5h 47m

Lambert-St Louis

Mon 1/5

2:45 pm-7:12 pm

1 stop5h 27m

$279

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 1/15

2:40 pm-8:58 pm

1 stop5h 18m

Lambert-St Louis

Sat 1/17

7:00 am-5:12 pm

2 stops11h 12m

$284

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 1/14

12:35 pm-9:13 pm

2 stops7h 38m

Lambert-St Louis

Wed 1/21

9:57 am-5:12 pm

2 stops8h 15m

$301

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 1/1

3:35 pm-10:22 pm

1 stop5h 47m

Lambert-St Louis

Mon 1/5

3:10 pm-9:59 pm

2 stops7h 49m

$332

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Tue 2/3

5:10 am-1:16 pm

1 stop7h 06m

Lambert-St Louis

Sat 2/7

4:15 pm-8:32 pm

1 stop5h 17m

$339

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Tue 2/3

12:35 pm-8:58 pm

1 stop7h 23m

Lambert-St Louis

Sat 2/7

9:57 am-8:32 pm

2 stops11h 35m

$344

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Tue 2/3

5:10 am-2:30 pm

2 stops8h 20m

Lambert-St Louis

Sat 2/7

8:05 am-7:14 pm

2 stops12h 09m

$349

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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 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 $318. 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

Fastest flight time	5h 02m
Direct flights	None

The fastest flight from Rapid City to St. Louis takes 5h 02m

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

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 02m.
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 December 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 75% of the total bookings. Other popular airlines include Delta with 25%.

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 7.9 8,005 reviews		Search Delta flights
United Airlines	PriceFrom $264	Free Cancellation	Rating 7.4 9,092 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.