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$132+ Cheap flights from Rapid City (RAP) to Illinois

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 12/15. Fares are subject to change and may not be available on all flights or dates of travel.
RAP — ORD
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Rapid City to Illinois

Keep the following information in mind while searching for Rapid City to Illinois flight deals. Data was last updated September 17, 2025.

Round-trip from

$209
(United Airlines)

One-way from

$132
(Kiwi.com)

Popular in

April

Cheapest in

September

Average price

$302

Good round-trip deal

$353 or less

Good one-way deal

$192 or less
From Rapid City to Illinois
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One-way flight from Rapid City to Illinois
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Highest demand for flights based on searches. 11% potential increase in price ($51 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Rapid City to Illinois.
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Price to beat on a one-way flight from Rapid City to Illinois.
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Find flight deals from Rapid City to Illinois

Cheapest flights from Rapid City to Illinois
Explore the most affordable flight options available from Rapid City to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This United Airlines deal was found by Cheapflights users on 9/16. 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 10/181:44 pmRAP - ORD
Nonstop2h 21mUnited Airlines
Sun 10/198:45 amORD - RAP
Nonstop2h 28mUnited Airlines
Deal found 9/16$209
This United Airlines deal was found by Cheapflights users on 9/15. 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 10/1412:56 pmRAP - ORD
1 stop6h 29mUnited Airlines
Tue 10/218:45 amORD - RAP
Nonstop2h 28mUnited Airlines
Deal found 9/15$219
This United Airlines deal was found by Cheapflights users on 9/15. 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 10/225:50 pmRAP - ORD
1 stop5h 09mUnited Airlines
Tue 10/282:40 pmORD - RAP
1 stop5h 03mUnited Airlines
Deal found 9/15$229
This United Airlines deal was found by Cheapflights users on 9/16. 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 10/11:44 pmRAP - ORD
Nonstop2h 21mUnited Airlines
Sun 10/55:01 amORD - RAP
1 stop6h 56mUnited Airlines
Deal found 9/16$239
This United Airlines deal was found by Cheapflights users on 9/15. 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 9/305:50 pmRAP - ORD
1 stop5h 09mUnited Airlines
Sat 10/45:01 amORD - RAP
1 stop5h 51mUnited Airlines
Deal found 9/15$249
This Delta deal was found by Cheapflights users on 9/15. 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.
Wed 10/224:34 pmRAP - ORD
1 stop3h 45mDelta
Wed 10/291:25 pmORD - RAP
2 stops10h 11mDelta
Deal found 9/15$274
This United Airlines deal was found by Cheapflights users on 9/16. 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 10/161:44 pmRAP - ORD
Nonstop2h 21mUnited Airlines
Sun 10/198:45 amORD - RAP
Nonstop2h 28mUnited Airlines
Deal found 9/16$280
This United Airlines deal was found by Cheapflights users on 9/17. 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 10/221:44 pmRAP - ORD
Nonstop2h 21mUnited Airlines
Wed 10/291:55 pmORD - RAP
1 stop7h 31mUnited Airlines
Deal found 9/17$289
This United Airlines deal was found by Cheapflights users on 9/16. 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 10/73:20 pmRAP - ORD
1 stop6h 19mUnited Airlines
Mon 10/138:45 amORD - RAP
Nonstop2h 28mUnited Airlines
Deal found 9/16$302
This United Airlines deal was found by Cheapflights users on 9/15. 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 9/1911:18 amRAP - STL
1 stop4h 15mUnited Airlines
Sun 9/215:15 amSTL - RAP
1 stop4h 51mUnited Airlines
Deal found 9/15$350
This American Airlines deal was found by Cheapflights users on 9/16. 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 9/2611:09 amRAP - STL
1 stop6h 32mAmerican Airlines
Sun 9/285:18 amSTL - RAP
1 stop7h 44mAmerican Airlines
Deal found 9/16$394
This Delta deal was found by Cheapflights users on 9/17. 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.
Fri 12/54:25 pmRAP - STL
1 stop6h 03mDelta
Sun 12/76:00 amSTL - RAP
1 stop5h 22mDelta
Deal found 9/17$409

Cheapflights Fare Finder

 
Customize your flight search to find flights from Rapid City to Illinois 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 September 17, 2025.
Use the filters below to find and compare flights from Rapid City to Illinois that are best for you.

Fly from

Rapid City

Fly to

Illinois

Route

Depart

Return

Price

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Tue 10/14

12:56 pm-8:25 pm

1 stop6h 29m

Chicago O'Hare Intl

Tue 10/21

8:45 am-10:13 am

Nonstop2h 28m

$219

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Tue 9/30

5:50 pm-11:59 pm

1 stop5h 09m

Chicago O'Hare Intl

Sat 10/4

8:45 am-10:13 am

Nonstop2h 28m

$239

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Wed 10/1

1:44 pm-5:05 pm

Nonstop2h 21m

Chicago O'Hare Intl

Sun 10/5

5:01 am-10:57 am

1 stop6h 56m

$239

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Tue 3/3

4:00 pm-11:10 pm

1 stop6h 10m

Lambert-St Louis

Sat 3/7

5:30 pm-10:14 pm

1 stop5h 44m

$249

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Wed 10/22

4:34 pm-9:19 pm

1 stop3h 45m

Chicago O'Hare Intl

Wed 10/29

1:25 pm-10:36 pm

2 stops10h 11m

$274

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Wed 3/4

6:20 am-11:33 am

1 stop4h 13m

Chicago O'Hare Intl

Sat 3/7

9:30 am-3:14 pm

1 stop6h 44m

$279

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Thu 10/16

1:44 pm-5:05 pm

Nonstop2h 21m

Chicago O'Hare Intl

Sun 10/19

8:45 am-10:13 am

Nonstop2h 28m

$280

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Wed 10/22

1:44 pm-5:05 pm

Nonstop2h 21m

Chicago O'Hare Intl

Wed 10/29

2:40 pm-8:26 pm

1 stop6h 46m

$289

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Fri 12/5

4:25 pm-11:28 pm

1 stop6h 03m

Lambert-St Louis

Sun 12/7

6:00 am-10:22 am

1 stop5h 22m

$409

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Fri 12/5

2:55 pm-8:57 pm

1 stop5h 02m

Lambert-St Louis

Sun 12/7

4:30 pm-5:10 pm

1 stop25h 40m

$409

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 28 results
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Best time to book a flight from Rapid City to Illinois

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

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

Currently, August is the cheapest month in which you can book a flight from Rapid City to Illinois (average of $245). Flying from Rapid City to Illinois in March is currently the most expensive (average of $321). 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 RAP to IL?

Find hourly flight availability from Rapid City to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

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

Weekly flight availability from Rapid City to Illinois

Explore weekly flight availability from Rapid City to Illinois. 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 September 17, 2025.

The most flights from RAP to USIL are scheduled on a Monday (6 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (5 on average).

How much does it cost to fly round-trip from Rapid City to Illinois?

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated September 17, 2025.
Peruse reviews from past customers who have flown with Delta, United Airlines, and American Airlines from Rapid City to Illinois to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,926 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,961 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Rapid City to Illinois. 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 from for flights from Rapid City to Illinois?

    Rapid City (RAP), located 9.0 mi from the city center, is the airport you fly out of when you book flights from Rapid City to Illinois.

  • How long is the flight from Rapid City to Illinois?

    For as low as $249, United Airlines can have you in Illinois from Rapid City in 6h 10m. Airlines will cover a distance of 751 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    The most popular route from Rapid City to Illinois is Rapid City - Chicago O'Hare Intl. You may also consider Rapid City - Lambert-St Louis or Rapid City - Chicago Midway.

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

    No one likes to see their flight delayed. When booking a flight from Rapid City to Illinois consider choosing Emirates (76%), Air New Zealand (76%) or Qatar Airways (68%) as they are the most reliable in getting you off to your destination on time.

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

    On average you can expect to pay $597 for a flight from Rapid City to Illinois. The cheapest flight overall is $165 while the most popular route, (Rapid City - Chicago O'Hare Intl) is currently priced at $209.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Rapid City to Illinois (average of $245). Flying from Rapid City to Illinois in March is currently the most expensive (average of $321). 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.

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Alternative routes for Rapid City to Illinois

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

Discover the top 3 airlines that operate flights from Rapid City to Illinois. 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$189Average$219FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$210Average$352FlexibilityNo cancel feeOn-time69%
DeltaCheapest$228Average$358FlexibilityNo cancel feeOn-timeN/A

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