$245+ Cheap flights from St. Louis to Rapid City (STL - RAP)
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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
STL — RAP
Oct 12 — Oct 191
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Rapid City 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
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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 St. Louis to Rapid City
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Cheapest flights from St. Louis to Rapid CityExplore the most affordable flight options available from St. Louis to Rapid City. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 12, 2026.
Explore the most affordable flight options available from St. Louis to Rapid City. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 12, 2026.
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Tue 9/294:39 pm -
1 stop6h 51m
Tue 10/65:53 pm -
1 stop4h 51m
Deal found 9/11![United Airlines logo]()
$344
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.
Wed 10/75:40 am -
1 stop5h 14m
Wed 10/145:04 pm -
1 stop5h 38m
Deal found 9/7![American Airlines logo]()
$345
This American Airlines deal was found by Cheapflights users on 9/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/263:34 pm -
1 stop6h 49m
Wed 9/3012:47 pm -
1 stop5h 20m
Deal found 9/11![American Airlines logo]()
$349
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.
Sun 9/205:43 am -
1 stop5h 04m
Wed 9/304:56 pm -
1 stop5h 47m
Deal found 9/7![American Airlines logo]()
$364
This United Airlines deal was found by Cheapflights users on 9/9. 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 9/161:36 pm -
1 stop5h 16m
Fri 10/21:37 pm -
1 stop6h 44m
Deal found 9/9![United Airlines logo]()
$383
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:00 am -
1 stop5h 15m
Sat 10/248:45 am -
1 stop6h 45m
Deal found 9/10![United Airlines logo]()
$399
This American Airlines deal was found by Cheapflights users on 9/8. 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 10/85:40 am -
1 stop5h 14m
Thu 10/155:04 pm -
1 stop5h 38m
Deal found 9/8![American Airlines logo]()
$401
Best flights from St. Louis to Rapid CityDiscover carefully curated flight deals from St. Louis to Rapid City that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 12, 2026.
Discover carefully curated flight deals from St. Louis to Rapid City that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 12, 2026.
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.
Wed 10/75:40 am -
1 stop5h 14m
Wed 10/145:04 pm -
1 stop5h 38m
Deal found 9/7![American Airlines logo]()
$345
This United Airlines deal was found by Cheapflights users on 9/8. 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 10/216:00 am -
1 stop5h 15m
Sat 10/248:45 am -
1 stop6h 45m
Deal found 9/8![United Airlines logo]()
$399
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Sat 9/264:49 pm -
1 stop6h 41m
Wed 9/307:05 am -
1 stop4h 35m
Deal found 9/11![United Airlines logo]()
$429
This United Airlines deal was found by Cheapflights users on 9/8. 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.
Mon 10/264:39 pm -
1 stop5h 04m
Fri 10/305:50 pm -
1 stop26h 09m
Deal found 9/8![United Airlines logo]()
$507
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/712:20 pm -
2 stops11h 10m
Wed 10/145:00 am -
2 stops9h 21m
Deal found 9/7![United Airlines logo]()
$544
Last-minute flights from St. Louis to Rapid CityDiscover last-minute flight deals from St. Louis to Rapid City. Data last updated September 12, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Rapid City. Data last updated September 12, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/9. 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 9/161:36 pm -
1 stop5h 16m
Fri 10/21:37 pm -
1 stop6h 44m
Deal found 9/9![United Airlines logo]()
$383
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.
Sun 9/205:43 am -
1 stop5h 04m
Wed 9/304:56 pm -
1 stop5h 47m
Deal found 9/7![American Airlines logo]()
$364
This American Airlines deal was found by Cheapflights users on 9/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/263:34 pm -
1 stop6h 49m
Wed 9/3012:47 pm -
1 stop5h 20m
Deal found 9/11![American Airlines logo]()
$349
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Tue 9/294:39 pm -
1 stop6h 51m
Tue 10/65:53 pm -
1 stop4h 51m
Deal found 9/11![United Airlines logo]()
$344
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.
Wed 10/75:40 am -
1 stop5h 14m
Wed 10/145:04 pm -
1 stop5h 38m
Deal found 9/7![American Airlines logo]()
$345
This American Airlines deal was found by Cheapflights users on 9/8. 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 10/85:40 am -
1 stop5h 14m
Thu 10/155:04 pm -
1 stop5h 38m
Deal found 9/8![American Airlines logo]()
$401
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:00 am -
1 stop5h 15m
Sat 10/248:45 am -
1 stop6h 45m
Deal found 9/10![United Airlines logo]()
$399
One-way flights from St. Louis to Rapid CitySearch for one-way flight options from St. Louis to Rapid City. Find affordable one-way fares based on user searches. Data last updated September 12, 2026.
Search for one-way flight options from St. Louis to Rapid City. Find affordable one-way fares based on user searches. Data last updated September 12, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/302:29 pm -
3 stops55h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Multiple Airlines logo]()
$245
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/85:10 am -
1 stop5h 18m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![United Airlines logo]()
$274
This United Airlines deal was found by Cheapflights users on 9/8. 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.
Tue 10/131:29 pm -
2 stops8h 23m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![United Airlines logo]()
$289
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Wed 9/164:40 pm -
1 stop4h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![United Airlines logo]()
$351
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Sat 9/194:40 pm -
1 stop6h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![United Airlines logo]()
$361
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1612:17 pm -
3 stops55h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Multiple Airlines logo]()
$630
Find flight deals from St. Louis to Rapid City
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Rapid City (RAP). 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 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $344 (United Airlines) |
One-way from | $245 (Kiwi.com) |
Popular in | December |
Cheapest in | February |
Average price | $399 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Rapid City 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 12, 2026.
Use the filters below to find and compare flights from St. Louis to Rapid City that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisRapid City
STL Lambert-St Louis - RAP Rapid City
STLRAP
Lambert-St Louis
Thu 10/8
5:10 am-9:28 am
1 stop5h 18m
Rapid City
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$274
St. LouisRapid City
STL Lambert-St Louis - RAP Rapid City
STLRAP
Lambert-St Louis
Wed 9/30
2:29 pm-1:45 pm
2 stops24h 16m
Rapid City
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$279
St. LouisRapid City
STL Lambert-St Louis - RAP Rapid City
STLRAP
Lambert-St Louis
Wed 10/7
5:40 am-9:54 am
1 stop5h 14m
Rapid City
Wed 10/14
5:04 pm-11:42 pm
1 stop5h 38m
$345
Quickest round-trip
St. LouisRapid City
STL Lambert-St Louis - RAP Rapid City
STLRAP
Lambert-St Louis
Wed 9/16
4:40 pm-8:38 pm
1 stop4h 58m
Rapid City
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$351
St. LouisRapid City
STL Lambert-St Louis - RAP Rapid City
STLRAP
Lambert-St Louis
Sat 9/19
12:59 pm-10:26 pm
2 stops10h 27m
Rapid City
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$366
St. LouisRapid City
STL Lambert-St Louis - RAP Rapid City
STLRAP
Lambert-St Louis
Wed 10/21
6:00 am-10:15 am
1 stop5h 15m
Rapid City
Sat 10/24
8:45 am-4:30 pm
1 stop6h 45m
$399
St. LouisRapid City
STL Lambert-St Louis - RAP Rapid City
STLRAP
Lambert-St Louis
Sun 9/20
5:43 am-9:47 am
1 stop5h 04m
Rapid City
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$403
St. LouisRapid City
STL Lambert-St Louis - RAP Rapid City
STLRAP
Lambert-St Louis
Sun 9/20
1:55 pm-10:18 pm
2 stops9h 23m
Rapid City
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$418
St. LouisRapid City
STL Lambert-St Louis - RAP Rapid City
STLRAP
Lambert-St Louis
Sat 9/26
4:49 pm-10:30 pm
1 stop6h 41m
Rapid City
Wed 9/30
7:05 am-12:40 pm
1 stop4h 35m
$429
St. LouisRapid City
STL Lambert-St Louis - RAP Rapid City
STLRAP
Lambert-St Louis
Mon 10/26
4:39 pm-8:43 pm
1 stop5h 04m
Rapid City
Fri 10/30
5:50 pm-8:59 pm
1 stop26h 09m
$507
Showing 1-10 of 14 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Rapid City
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 St. Louis to Rapid City 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 St. Louis-Rapid City flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Rapid City flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Rapid City flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Rapid City 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 St. Louis-Rapid City 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 St. Louis to Rapid City
Have a flexible travel schedule? Discover the best time to fly to Rapid City from St. Louis with our price prediction graph.
STL-RAP
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 St. Louis to Rapid City
What is the cheapest month to book a flight from St. Louis to Rapid City?
Currently, February is the cheapest month in which you can book a flight from St. Louis to Rapid City (average of $289). Flying from St. Louis to Rapid City in December is currently the most expensive (average of $458). 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.
How much does it cost to fly round-trip from St. Louis to Rapid City?
Airfare is typical for this route at the moment.
St. Louis to Rapid City flights typically cost between $318 and $503 in September.The cheapest round-trip price found within the last 5 days was $344 on United Airlines (Sep 29-Oct 6).
Reviews of airlines servicing Rapid City
Get insights into the airlines that provide service to Rapid City. 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 Rapid City. Reviews last updated September 12, 2026.
Read through reviews of airlines operating flights from St. Louis to Rapid City, such as Delta,United Airlines, andAmerican Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.8
Boarding
8.1
Food
7.2
Entertainment
7.8
Crew
8.5
Overall
7.8
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Comfort
7.8
Boarding
8.1
Food
7.2
Entertainment
7.8
Crew
8.5
Overall
7.8
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Comfort
7.8
Boarding
8.1
Food
7.2
Entertainment
7.8
Crew
8.5
Overall
7.8
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Comfort
7.8
Boarding
8.1
Food
7.2
Entertainment
7.8
Crew
8.5
Overall
7.8
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Rapid City. 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 Rapid City?
Book flights to Rapid City if you plan to visit one of these locationsDeadwood
Keystone
Spearfish
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St. Louis and Rapid City flights
Browse other St. Louis and Rapid City flight options. Last updated on September 12, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on September 12, 2026.
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Explore flights to Rapid City departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 12, 2026.
Top 3 airlines flying from St. Louis to Rapid City
Discover the top 3 airlines that operate flights from St. Louis to Rapid City. 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 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$248 | Average$353 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$268 | Average$387 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$293 | Average$398 | FlexibilityNo cancel fee | On-time71% |