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Rapid City

$99+ Cheap flights from Illinois to Rapid City (RAP)

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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — RAP
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheap flight deals from Illinois to Rapid City

Keep the following information in mind while searching for Illinois to Rapid City flight deals. Data was last updated August 14, 2025.

Round-trip from

$219
(United Airlines)

One-way from

$99
(Mytrip)

Popular in

April

Cheapest in

February

Average price

$329

Good round-trip deal

$279 or less

Good one-way deal

$325 or less
From Illinois to Rapid City
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One-way flight from Illinois to Rapid City
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Highest demand for flights based on searches. 16% potential increase in price ($71 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Illinois to Rapid City.
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Price to beat on a one-way flight from Illinois to Rapid City.
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Find flight deals from Illinois to Rapid City

Cheapest flights from Illinois to Rapid City
Explore the most affordable flight options available from Illinois to Rapid City. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This United Airlines deal was found by Cheapflights users on 8/12. 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 9/278:45 amORD - RAP
Nonstop2h 28mUnited Airlines
Tue 9/305:50 pmRAP - ORD
1 stop5h 09mUnited Airlines
Deal found 8/12$219
This United Airlines deal was found by Cheapflights users on 8/13. 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 10/65:01 amORD - RAP
1 stop5h 09mUnited Airlines
Sun 10/121:44 pmRAP - ORD
Nonstop2h 21mUnited Airlines
Deal found 8/13$235
This American Airlines deal was found by Cheapflights users on 8/12. 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 10/111:08 amORD - RAP
Nonstop2h 34mAmerican Airlines
Sun 10/56:12 pmRAP - ORD
Nonstop2h 18mAmerican Airlines
Deal found 8/12$239
This United Airlines deal was found by Cheapflights users on 8/14. 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 9/115:00 amORD - RAP
1 stop7h 32mUnited Airlines
Thu 9/181:35 pmRAP - ORD
Nonstop2h 21mUnited Airlines
Deal found 8/14$244
This American Airlines deal was found by Cheapflights users on 8/14. 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.
Fri 9/265:00 amORD - RAP
1 stop6h 35mAmerican Airlines
Mon 9/296:12 pmRAP - ORD
Nonstop2h 18mAmerican Airlines
Deal found 8/14$249
This American Airlines deal was found by Cheapflights users on 8/14. 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 10/25:00 amORD - RAP
1 stop7h 22mAmerican Airlines
Sun 10/56:12 pmRAP - ORD
Nonstop2h 18mAmerican Airlines
Deal found 8/14$251
This American Airlines deal was found by Cheapflights users on 8/14. 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.
Fri 8/224:21 pmORD - RAP
Nonstop2h 21mAmerican Airlines
Mon 8/256:12 pmRAP - ORD
Nonstop2h 18mAmerican Airlines
Deal found 8/14$265
This American Airlines deal was found by Cheapflights users on 8/13. 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 9/2111:08 amORD - RAP
Nonstop2h 34mAmerican Airlines
Thu 9/256:12 pmRAP - ORD
Nonstop2h 18mAmerican Airlines
Deal found 8/13$271
This Delta deal was found by Cheapflights users on 8/13. 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.
Sat 8/166:04 amMDW - RAP
1 stop6h 33mDelta
Wed 8/206:20 amRAP - MDW
1 stop5h 43mDelta
Deal found 8/13$286
This United Airlines deal was found by Cheapflights users on 8/13. 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.
Fri 9/56:35 amSTL - RAP
1 stop4h 47mUnited Airlines
Mon 9/84:47 pmRAP - STL
1 stop6h 06mUnited Airlines
Deal found 8/13$293
This Delta deal was found by Cheapflights users on 8/14. 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.
Thu 12/49:20 amMDW - RAP
1 stop5h 20mDelta
Tue 12/96:20 amRAP - MDW
1 stop5h 49mDelta
Deal found 8/14$300
This American Airlines deal was found by Cheapflights users on 8/14. 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.
Mon 9/2910:54 amMLI - RAP
1 stop6h 10mAmerican Airlines
Thu 10/26:12 pmRAP - MLI
1 stop4h 36mAmerican Airlines
Deal found 8/14$301

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois 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 2,558,603 searches. Data last updated August 14, 2025.
Use the filters below to find and compare flights from Illinois to Rapid City that are best for you.

Fly from

Illinois

Fly to

Rapid City

Route

Depart

Return

Price

ChicagoRapid City

ORD - RAP

ORDRAP

Chicago O'Hare Intl

Sat 9/27

8:45 am-10:13 am

Nonstop2h 28m

Rapid City

Tue 9/30

5:50 pm-11:59 pm

1 stop5h 09m

$219

ChicagoRapid City

ORD - RAP

ORDRAP

Chicago O'Hare Intl

Mon 10/6

5:01 am-9:10 am

1 stop5h 09m

Rapid City

Sun 10/12

1:44 pm-5:05 pm

Nonstop2h 21m

$235

ChicagoRapid City

ORD - RAP

ORDRAP

Chicago O'Hare Intl

Sat 9/27

1:40 pm-3:02 pm

Nonstop2h 22m

Rapid City

Sun 9/28

6:12 pm-9:30 pm

Nonstop2h 18m

$239

ChicagoRapid City

ORD - RAP

ORDRAP

Chicago O'Hare Intl

Wed 10/1

11:08 am-12:42 pm

Nonstop2h 34m

Rapid City

Sun 10/5

6:12 pm-9:30 pm

Nonstop2h 18m

$239

ChicagoRapid City

ORD - RAP

ORDRAP

Chicago O'Hare Intl

Thu 9/11

5:00 am-11:32 am

1 stop7h 32m

Rapid City

Thu 9/18

1:35 pm-4:56 pm

Nonstop2h 21m

$244

ChicagoRapid City

ORD - RAP

ORDRAP

Chicago O'Hare Intl

Fri 9/5

5:00 am-10:35 am

1 stop6h 35m

Rapid City

Tue 9/9

1:12 pm-4:36 pm

Nonstop2h 24m

$249

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Thu 9/4

4:40 pm-9:59 pm

1 stop6h 19m

Rapid City

Mon 9/8

4:47 pm-11:53 pm

1 stop6h 06m

$293

St. LouisRapid City

STL - RAP

STLRAP

Lambert-St Louis

Fri 9/5

5:15 am-11:32 am

1 stop7h 17m

Rapid City

Mon 9/8

4:47 pm-11:53 pm

1 stop6h 06m

$293

ChicagoRapid City

MDW - RAP

MDWRAP

Chicago Midway

Thu 12/4

9:20 am-1:40 pm

1 stop5h 20m

Rapid City

Tue 12/9

6:20 am-1:09 pm

1 stop5h 49m

$300

MolineRapid City

MLI - RAP

MLIRAP

Moline Quad-City

Mon 9/29

10:54 am-4:04 pm

1 stop6h 10m

Rapid City

Thu 10/2

6:12 pm-11:48 pm

1 stop4h 36m

$301

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 41 results
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Best time to book a flight from Illinois to Rapid City

Have a flexible travel schedule? Discover the best time to fly to Rapid City from Illinois 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 Illinois to Rapid City

What is the cheapest month to book a flight from Illinois to Rapid City?

Currently, January is the cheapest month in which you can book a flight from Illinois to Rapid City (average of $348). Flying from Illinois to Rapid City in June is currently the most expensive (average of $502). 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.

What is the cheapest time of day to fly from IL to RAP?

Find hourly flight availability from Illinois to Rapid City. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Rapid City as you normally would.

Weekly flight availability from Illinois to Rapid City

Explore weekly flight availability from Illinois to Rapid City. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 14, 2025.

The most flights from USIL to RAP are scheduled on a Wednesday (8 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (2 on average).

Related info for your journey

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

  • What airport do you fly into for flights to Rapid City from Illinois?

    Most people fly into Rapid City (RAP) if they book a flight to Rapid City from Illinois. Rapid City is conveniently located just 9.0 mi from Rapid City’s city center.

  • What are the cheapest airlines to fly from Illinois to Rapid City one-way?

    One-way options have recently been found by users for as low as $175 on Delta. Other airlines that offer cheap prices include American Airlines from $450 and United Airlines from $496 one-way.

  • What are the most popular routes from Illinois to Rapid City?

    When deciding which route to take from Illinois to Rapid City consider Chicago O'Hare Intl - Rapid City, Chicago Midway - Rapid City or Lambert-St Louis - Rapid City as they are the most popular.

  • What are the most reliable airlines from Illinois to Rapid City?

    No one likes to see their flight delayed. When booking a flight from Illinois to Rapid City consider choosing American Airlines (81%), Envoy Air (81%) or United Airlines (71%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Illinois to Rapid City?

    While on average a flight from Illinois to Rapid City is generally $431, our data shows the cheapest flight currently is $125. When looking at the most popular route, (Chicago O'Hare Intl - Rapid City), you can expect to pay $235 for that flight.

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

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

  • How can I find direct flights from Illinois to Rapid City?

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

  • Can I find deals for business class flights from Illinois to Rapid City?

    Yes. Cheapflights offers flight deals from Illinois to Rapid City 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 Illinois to Rapid City?

    Currently, January is the cheapest month in which you can book a flight from Illinois to Rapid City (average of $348). Flying from Illinois to Rapid City in June is currently the most expensive (average of $502). 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
Deadwood
Keystone
Sturgis
Spearfish

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Alternative routes for Illinois to Rapid City

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Illinois to Rapid City

Discover the top 3 airlines that operate flights from Illinois 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 2,558,603 searches. Data last updated August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$209Average$296FlexibilityNo cancel feeOn-time71%
DeltaCheapest$228Average$345FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$232Average$441FlexibilityNo cancel feeOn-time69%

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