$260+ Cheap flights from Rapid City to St. Louis (RAP - STL)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
RAP — STL
Oct 8 — Oct 151
Round-trip
1 adult, Economy
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Find cheap flights from Rapid City to St. Louis with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Rapid City to St. Louis
Cheapest
Best
Last-minute
One-way
Cheapest flights from Rapid City to St. LouisExplore 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 September 8, 2026.
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 September 8, 2026.
This United Airlines deal was found by Cheapflights users on 9/4. 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.
Sat 10/247:05 am -
1 stop4h 35m
Wed 10/281:40 pm -
1 stop6h 39m
Deal found 9/4![United Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 9/4. 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.
Sat 10/245:04 pm -
1 stop5h 38m
Wed 10/2811:32 am -
2 stops11h 07m
Deal found 9/4![American Airlines logo]()
$324
This American Airlines deal was found by Cheapflights users on 9/4. 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.
Thu 9/244:56 pm -
1 stop5h 47m
Sun 9/275:43 am -
1 stop5h 04m
Deal found 9/4![American Airlines logo]()
$334
This American Airlines deal was found by Cheapflights users on 9/7. 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.
Tue 9/226:07 pm -
1 stop5h 20m
Sat 9/263:34 pm -
1 stop6h 49m
Deal found 9/7![American Airlines logo]()
$349
This United Airlines deal was found by Cheapflights users on 9/3. 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.
Wed 10/287:00 am -
1 stop4h 38m
Sat 10/314:39 pm -
1 stop5h 04m
Deal found 9/3![United Airlines logo]()
$399
Best flights from Rapid City to St. LouisDiscover carefully curated flight deals from Rapid City to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 8, 2026.
Discover carefully curated flight deals from Rapid City to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 8, 2026.
This American Airlines deal was found by Cheapflights users on 9/3. 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.
Thu 9/246:07 pm -
1 stop5h 20m
Sun 9/275:43 am -
1 stop5h 04m
Deal found 9/3![American Airlines logo]()
$319
This United Airlines deal was found by Cheapflights users on 9/4. 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.
Sat 10/247:05 am -
1 stop4h 35m
Wed 10/281:40 pm -
1 stop6h 39m
Deal found 9/4![United Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 9/7. 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.
Sat 10/245:04 pm -
1 stop5h 38m
Wed 10/285:40 am -
1 stop5h 14m
Deal found 9/7![American Airlines logo]()
$319
This United Airlines deal was found by Cheapflights users on 9/3. 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.
Wed 10/287:00 am -
1 stop4h 38m
Sat 10/314:39 pm -
1 stop5h 04m
Deal found 9/3![United Airlines logo]()
$399
Last-minute flights from Rapid City to St. LouisDiscover last-minute flight deals from Rapid City to St. Louis. Data last updated September 8, 2026 and is based on user searches.
Discover last-minute flight deals from Rapid City to St. Louis. Data last updated September 8, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/7. 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.
Tue 9/226:07 pm -
1 stop5h 20m
Sat 9/263:34 pm -
1 stop6h 49m
Deal found 9/7![American Airlines logo]()
$349
This American Airlines deal was found by Cheapflights users on 9/4. 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.
Thu 9/244:56 pm -
1 stop5h 47m
Sun 9/275:43 am -
1 stop5h 04m
Deal found 9/4![American Airlines logo]()
$334
This United Airlines deal was found by Cheapflights users on 9/4. 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.
Sat 10/247:05 am -
1 stop4h 35m
Wed 10/281:40 pm -
1 stop6h 39m
Deal found 9/4![United Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 9/4. 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.
Sat 10/245:04 pm -
1 stop5h 38m
Wed 10/2811:32 am -
2 stops11h 07m
Deal found 9/4![American Airlines logo]()
$324
This United Airlines deal was found by Cheapflights users on 9/3. 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.
Wed 10/287:00 am -
1 stop4h 38m
Sat 10/314:39 pm -
1 stop5h 04m
Deal found 9/3![United Airlines logo]()
$399
One-way flights from Rapid City to St. LouisSearch for one-way flight options from Rapid City to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 8, 2026.
Search for one-way flight options from Rapid City to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 8, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/115:35 pm -
1 stop18h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Multiple Airlines logo]()
$260
This United Airlines deal was found by Cheapflights users on 9/4. 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.
Sun 10/117:05 am -
1 stop4h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![United Airlines logo]()
$351
Find 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 September 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $319 (United Airlines) |
One-way from | $260 (Kiwi.com) |
Popular in | May |
Cheapest in | January |
Average price | $387 |
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 7,457,451 searches. Data last updated September 8, 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
Cheapest round-trip
Rapid CitySt. Louis
RAP Rapid City - STL Lambert-St Louis
RAPSTL
Rapid City
Sun 10/11
5:35 pm-12:35 pm
1 stop18h 00m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$260
Rapid CitySt. Louis
RAP Rapid City - STL Lambert-St Louis
RAPSTL
Rapid City
Thu 9/24
6:07 pm-12:27 am
1 stop5h 20m
Lambert-St Louis
Sun 9/27
5:43 am-9:47 am
1 stop5h 04m
$319
Rapid CitySt. Louis
RAP Rapid City - STL Lambert-St Louis
RAPSTL
Rapid City
Sat 10/24
7:05 am-12:40 pm
1 stop4h 35m
Lambert-St Louis
Wed 10/28
1:40 pm-7:19 pm
1 stop6h 39m
$319
Rapid CitySt. Louis
RAP Rapid City - STL Lambert-St Louis
RAPSTL
Rapid City
Sat 10/24
5:04 pm-11:42 pm
1 stop5h 38m
Lambert-St Louis
Wed 10/28
5:40 am-9:54 am
1 stop5h 14m
$319
Quickest round-trip
Rapid CitySt. Louis
RAP Rapid City - STL Lambert-St Louis
RAPSTL
Rapid City
Sun 10/11
7:05 am-12:40 pm
1 stop4h 35m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$351
Rapid CitySt. Louis
RAP Rapid City - STL Lambert-St Louis
RAPSTL
Rapid City
Wed 10/28
7:00 am-12:38 pm
1 stop4h 38m
Lambert-St Louis
Sat 10/31
4:39 pm-8:43 pm
1 stop5h 04m
$399
Sorted by cheapest first
Compare providers for flights from Rapid City to St. Louis
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Rapid City to St. Louis in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Rapid City-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Rapid City-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Rapid City-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Rapid City-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Rapid City-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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.
RAP-STL
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
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 September 8, 2026.
Get a feel of what it's like to fly with Delta and United Airlines from Rapid City to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.2
Crew
8.5
Comfort
7.8
Entertainment
7.8
Boarding
8.1
Overall
7.8
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
Food
7.2
Crew
8.5
Comfort
7.8
Entertainment
7.8
Boarding
8.1
Overall
7.8
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
Food
7.2
Crew
8.5
Comfort
7.8
Entertainment
7.8
Boarding
8.1
Overall
7.8
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
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.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsFairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Edwardsville
Glencoe
Chesterfield
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Rapid City and St. Louis flights
Browse other Rapid City and St. Louis flight options. Last updated on September 8, 2026.
Other flights from Rapid City
Browse through other flights departing from Rapid City. Flights are based on user searches made on Cheapflights and were last updated on September 8, 2026.
Popular flight searches
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Other flights to St. Louis
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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 7,457,451 searches. Data last updated September 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$208 | Average$323 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$268 | Average$413 | FlexibilityNo cancel fee | On-time69% |