$862 Cheap Flights from Sofia (SOF) to Rapid City (RAP)

View $862 flight on Thu, Aug 6, 2026Opens in a new window

Popular airlines from Sofia Airport (SOF) to Rapid City Regional Airport (RAP)

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Cheap Flights from Sofia to Rapid City (SOF-RAP)

Prices were available within the past 7 days and start at $862 for one-way flights and $966 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu, Aug 6 - Sat, Aug 22
SOF
Sofia
RAP
Rapid City
$966 Roundtrip, found 1 hour ago
$966
Roundtrip
found 1 hour ago
Select United flight, departing Thu, Aug 6 from Sofia to Rapid City, returning Sat, Aug 22, priced at $966 found 1 hour ago
United
Thu, Aug 6 - Sat, Aug 22
SOF
Sofia
RAP
Rapid City
$1,039 Roundtrip, found 1 hour ago
$1,039
Roundtrip
found 1 hour ago
Select United flight, departing Thu, Aug 6 from Sofia to Rapid City, returning Sat, Aug 22, priced at $1,039 found 1 hour ago
Lufthansa
Thu, Aug 6 - Sat, Aug 22
SOF
Sofia
RAP
Rapid City
$1,083 Roundtrip, found 1 hour ago
$1,083
Roundtrip
found 1 hour ago
Select Lufthansa flight, departing Thu, Aug 6 from Sofia to Rapid City, returning Sat, Aug 22, priced at $1,083 found 1 hour ago
United
Thu, Aug 6 - Sat, Aug 22
SOF
Sofia
RAP
Rapid City
$1,104 Roundtrip, found 1 hour ago
$1,104
Roundtrip
found 1 hour ago
Select United flight, departing Thu, Aug 6 from Sofia to Rapid City, returning Sat, Aug 22, priced at $1,104 found 1 hour ago
United
Thu, Aug 6 - Sat, Aug 22
SOF
Sofia
RAP
Rapid City
$1,125 Roundtrip, found 1 hour ago
$1,125
Roundtrip
found 1 hour ago
Select United flight, departing Thu, Aug 6 from Sofia to Rapid City, returning Sat, Aug 22, priced at $1,125 found 1 hour ago
Bulgaria Air
Thu, Aug 6 - Sat, Aug 22
SOF
Sofia
RAP
Rapid City
$1,155 Roundtrip, found 1 hour ago
$1,155
Roundtrip
found 1 hour ago
Select Bulgaria Air flight, departing Thu, Aug 6 from Sofia to Rapid City, returning Sat, Aug 22, priced at $1,155 found 1 hour ago
Bulgaria Air
Thu, Aug 6 - Sat, Aug 22
SOF
Sofia
RAP
Rapid City
$1,155 Roundtrip, found 1 hour ago
$1,155
Roundtrip
found 1 hour ago
Select Bulgaria Air flight, departing Thu, Aug 6 from Sofia to Rapid City, returning Sat, Aug 22, priced at $1,155 found 1 hour ago
Bulgaria Air
Thu, Aug 6 - Sat, Aug 22
SOF
Sofia
RAP
Rapid City
$1,162 Roundtrip, found 1 hour ago
$1,162
Roundtrip
found 1 hour ago
Select Bulgaria Air flight, departing Thu, Aug 6 from Sofia to Rapid City, returning Sat, Aug 22, priced at $1,162 found 1 hour ago
Lufthansa
Thu, Aug 6 - Sat, Aug 22
SOF
Sofia
RAP
Rapid City
$1,180 Roundtrip, found 1 hour ago
$1,180
Roundtrip
found 1 hour ago
Select Lufthansa flight, departing Thu, Aug 6 from Sofia to Rapid City, returning Sat, Aug 22, priced at $1,180 found 1 hour ago
Bulgaria Air
Thu, Aug 6 - Sat, Aug 22
SOF
Sofia
RAP
Rapid City
$1,186 Roundtrip, found 1 hour ago
$1,186
Roundtrip
found 1 hour ago
Select Bulgaria Air flight, departing Thu, Aug 6 from Sofia to Rapid City, returning Sat, Aug 22, priced at $1,186 found 1 hour ago

Frequently asked questions

How much does a flight from Sofia Airport (SOF) to Rapid City Regional Airport (RAP) cost?
Secure a cheap one-way flight from $862 or cheap return flight from $966 from Sofia Airport (SOF) to Rapid City Regional Airport (RAP) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Sofia Airport (SOF) to Rapid City Regional Airport (RAP)?
August is the least expensive month to fly from SOF to RAP. Avoiding peak travel times is often the key to finding better fares.
What is the cheapest airline that flies from Sofia Airport (SOF) to Rapid City Regional Airport (RAP)?
Use the filter tool on Expedia to compare airlines and find the most affordable carrier that'll fly you from SOF to RAP. Then, sort your results by "Price (lowest to highest)" to snag the best deal available.
How many flights per day from Sofia Airport (SOF) to Rapid City Regional Airport (RAP)?
Direct flights from Sofia Airport (SOF) to Rapid City Regional Airport (RAP) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your travel dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SOF to RAP?
Generally you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* However, this can vary depending on the airline, season and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Sofia Airport (SOF) to Rapid City Regional Airport (RAP)?
To avoid possible delays on the Sofia Airport (SOF) to Rapid City Regional Airport (RAP) route, aim to travel before 3 PM. Departures after this time are 22% more likely to be canceled.**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 Sofia Airport (SOF) to Rapid City Regional Airport (RAP) last-minute?
Holding off until just before your trip to book a ticket from SOF to RAP generally means paying more. While you may find some last-minute deals, they're not always guaranteed. Be flexible with your travel plans to maximize your chances of snagging a bargain.
Is it cheaper to book a SOF to RAP flight and hotel package?
You'll typically save money by booking a SOF to RAP flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one convenient place. Once you've selected your ideal accommodations and flights, you can add extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Sofia Airport (SOF) to Rapid City Regional Airport (RAP)?
Typically, it's possible to cancel or reschedule your SOF to RAP flight. However, if it's been more than 24 hours since booking, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Origin airport
Sofia
Destination airport
Rapid City Regional
Airlines serving
United
Roundtrip price
$966
Distance
5592 mi

Book with confidence

Sofia to Rapid City Flights

The cheapest times to fly from Sofia 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 Sofia to Rapid City are during the month of August. You can find some of the cheapest flights from Sofia to Rapid City with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Sofia to Rapid City

Sunday is one of the best days to book for cheap flights from Sofia 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 Sofia 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 Sofia to Rapid City in 2026. You can also book with separate airlines for your outbound and return journeys, from $862 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 Sofia 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 Sofia 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.

 

Sofia to Rapid City Flights

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*Available to One Key members.