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$158+ Cheap flights from Rapid City to St. Louis (RAP - STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
RAP — STL
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
1 adult, Economy
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Cheap flight deals from Rapid City to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Rapid City (RAP) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated junio 12, 2025.

Round-trip from

$259
(United Airlines)

One-way from

$158
(American Airlines)

Popular in

March

Cheapest in

December

Average price

$344
From Rapid City to Lambert-St Louis
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One-way flight from Rapid City to Lambert-St Louis
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Highest demand for flights based on searches. 24% potential increase in price ($145 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Rapid City to St. Louis

Cheapest flights from Rapid City to St. Louis
Explore the most affordable flight options available from Rapid City to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on junio 12, 2025.

This United Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 6/265:30 amRAP - STL
1 stop6h 16mUnited Airlines
lun. 6/305:15 amSTL - RAP
1 stop4h 49mUnited Airlines
Deal found 6/11$259
This American Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/171:03 pmRAP - STL
1 stop7h 50mAmerican Airlines
dom. 9/217:23 amSTL - RAP
1 stop6h 10mAmerican Airlines
Deal found 6/10$298
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/102:25 pmRAP - STL
2 stops8h 28mDelta
jue. 8/143:42 pmSTL - RAP
2 stops7h 49mDelta
Deal found 6/10$855

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated junio 12, 2025.
Use the filters below to find and compare flights from Rapid City to St. Louis that are best for you.

Fly from

Rapid City

Fly to

St. Louis

Route

Depart

Return

Price

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

jue. 6/26

5:30 am-12:46 pm

1 stop6h 16m

Lambert-St Louis

lun. 6/30

5:15 am-9:04 am

1 stop4h 49m

$259

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

mié. 9/17

1:03 pm-9:53 pm

1 stop7h 50m

Lambert-St Louis

dom. 9/21

7:23 am-12:33 pm

1 stop6h 10m

$298

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

dom. 8/10

2:25 pm-11:53 pm

2 stops8h 28m

Lambert-St Louis

jue. 8/14

3:42 pm-10:31 pm

2 stops7h 49m

$855

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

mar. 8/19

6:04 pm-3:49 pm

1 stop20h 45m

$158

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

jue. 6/19

11:19 am-10:45 pm

2 stops10h 26m

$291

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

jue. 6/19

10:02 pm-6:41 pm

3 stops19h 39m

$489

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Best time to book a flight from Rapid City to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Rapid City with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Rapid City to St. Louis

What is the cheapest month to book a flight from Rapid City to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Rapid City to St. Louis (average of $311). Flying from Rapid City to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated junio 12, 2025.
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Rapid City to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Rapid City to St. Louis round-trip?

    United Airlines, at $259, was found to be the cheapest airline from Rapid City to St. Louis.Alternate airlines to your destination round-trip include American Airlines and Delta. United Airlines is currently priced 43% below the average price you’ll pay for this route.

  • Can I find deals for flights from Rapid City to St. Louis that include hotel bookings?

    Yes. In addition to deals on Rapid City to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Rapid City to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Rapid City to St. Louis.

  • Can I find deals for business class flights from Rapid City to St. Louis?

    Yes. Cheapflights offers flight deals from Rapid City to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Rapid City to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Rapid City to St. Louis (average of $311). Flying from Rapid City to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Rapid City?

Book flights to Rapid City if you plan to visit one of these locations
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Festus
Alton
Farmington

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Top 2 airlines flying from Rapid City to St. Louis

Discover the top 2 airlines that operate flights from Rapid City to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$248Average$333FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$299Average$418FlexibilityNo cancel feeOn-time69%

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