Cheap Flights from St. Louis (CPS) to Rapid City (RAP)

Popular airlines from St. Louis, MO (CPS-St. Louis Downtown) to Rapid City Regional Airport (RAP)

Frequently asked questions

How much does a flight from St. Louis Downtown Airport (CPS) to Rapid City Regional Airport (RAP) cost?
Snag a cheap one-way flight or cheap return flight from St. Louis Downtown Airport (CPS) to Rapid City Regional Airport (RAP) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from St. Louis Downtown Airport (CPS) to Rapid City Regional Airport (RAP)?
Traveling in is a good way to save, as it's the cheapest month for flights between CPS and RAP. You'll typically find the lowest prices during the off-season.
What is the cheapest airline that flies from St. Louis Downtown Airport (CPS) to Rapid City Regional Airport (RAP)?
Use the filters on Expedia to compare different airlines and find the most affordable carrier that'll take you from CPS to RAP. Then, sort your results by "Price (lowest to highest)" to snag a good deal.
How many flights per day from St. Louis Downtown Airport (CPS) to Rapid City Regional Airport (RAP)?
There are no daily nonstop flights departing from St. Louis Downtown Airport (CPS) to Rapid City Regional Airport (RAP). But you can choose flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be soaring above the clouds in no time.
What day of the week has the most flights from CPS to RAP?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can change depending on a number of factors, including the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from St. Louis Downtown Airport (CPS) to Rapid City Regional Airport (RAP)?
To avoid possible delays on the St. Louis Downtown Airport (CPS) to Rapid City Regional Airport (RAP) route, travel before 3 PM. Departures after this time have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from St. Louis Downtown Airport (CPS) to Rapid City Regional Airport (RAP) last-minute?
Last-minute bookings from CPS to RAP are typically more expensive. To lock in the best rates, start searching for flights as early as possible. That said, if you're flexible with your travel plans, it's possible to land a cheap ticket right before you leave.
Is it cheaper to book a CPS to RAP flight and hotel package?
Securing a CPS to RAP flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Select from our impressive range of accommodations and then add car rentals, flights and activities to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from St. Louis Downtown Airport (CPS) to Rapid City Regional Airport (RAP)?
You can usually cancel or reschedule your CPS to RAP flight. However, for bookings made more than 24 hours ago, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Origin airport
St. Louis Downtown
Destination airport
Rapid City Regional
Distance
767 mi

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St. Louis to Rapid City Flights

The cheapest times to fly from St. Louis to Rapid City

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Rapid City are during the month of . You can find some of the cheapest flights from St. Louis to Rapid City with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Rapid City

Sunday is one of the best days to book for cheap flights from St. Louis to Rapid City: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Rapid City

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Rapid City in 2025. You can also book with separate airlines for your outbound and return journeys, from one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Rapid City flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Rapid City airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

St. Louis to Rapid City Flights

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*Available to One Key members.