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$120+ 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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
RAP — ORD
ago. 25 — sep. 11
lun. 8/25
lun. 9/1
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 agosto 20, 2025.

Round-trip from

$200
(American Airlines)

One-way from

$120
(American Airlines)

Popular in

April

Cheapest in

September

Average price

$309

Good round-trip deal

$328 or less

Good one-way deal

$268 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. 12% potential increase in price ($55 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 August 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 agosto 20, 2025.

This American Airlines deal was found by Cheapflights users on 8/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/256:12 pmRAP - ORD
Nonstop2h 18mAmerican Airlines
dom. 9/284:17 pmORD - RAP
Nonstop2h 25mAmerican Airlines
Deal found 8/17$200
This United Airlines deal was found by Cheapflights users on 8/18. 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.
mar. 9/161:35 pmRAP - ORD
Nonstop2h 21mUnited Airlines
mar. 9/238:53 amORD - RAP
Nonstop2h 29mUnited Airlines
Deal found 8/18$209
This United Airlines deal was found by Cheapflights users on 8/17. 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.
mar. 10/2111:15 amRAP - ORD
1 stop6h 10mUnited Airlines
sáb. 10/258:45 amORD - RAP
Nonstop2h 28mUnited Airlines
Deal found 8/17$219
This United Airlines deal was found by Cheapflights users on 8/20. 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.
jue. 9/41:35 pmRAP - ORD
Nonstop2h 21mUnited Airlines
lun. 9/85:00 amORD - RAP
1 stop5h 06mUnited Airlines
Deal found 8/20$239
This United Airlines deal was found by Cheapflights users on 8/17. 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.
sáb. 10/185:50 pmRAP - ORD
1 stop5h 09mUnited Airlines
jue. 10/235:01 amORD - RAP
1 stop5h 09mUnited Airlines
Deal found 8/17$244
This American Airlines deal was found by Cheapflights users on 8/18. 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.
vie. 8/296:12 pmRAP - ORD
Nonstop2h 18mAmerican Airlines
lun. 9/110:49 amORD - RAP
Nonstop2h 31mAmerican Airlines
Deal found 8/18$255
This Delta deal was found by Cheapflights users on 8/19. 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.
sáb. 8/2310:55 amRAP - MDW
1 stop5h 42mDelta
lun. 8/257:17 pmMDW - RAP
1 stop4h 15mDelta
Deal found 8/19$286
This Delta deal was found by Cheapflights users on 8/19. 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.
jue. 12/184:35 pmRAP - STL
1 stop5h 27mDelta
mar. 1/66:30 amSTL - RAP
1 stop4h 35mDelta
Deal found 8/19$294
This Delta deal was found by Cheapflights users on 8/20. 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.
mié. 9/34:25 pmRAP - STL
1 stop5h 58mDelta
sáb. 9/67:00 amSTL - RAP
1 stop5h 37mDelta
Deal found 8/20$299
This American Airlines deal was found by Cheapflights users on 8/18. 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.
mar. 9/212:50 pmRAP - STL
1 stop5h 31mAmerican Airlines
sáb. 9/63:59 pmSTL - RAP
1 stop5h 54mAmerican Airlines
Deal found 8/18$309
This United Airlines deal was found by Cheapflights users on 8/20. 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.
vie. 9/511:18 amRAP - STL
1 stop4h 15mUnited Airlines
sáb. 9/65:15 amSTL - RAP
1 stop7h 17mUnited Airlines
Deal found 8/20$329
This United Airlines deal was found by Cheapflights users on 8/20. 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.
jue. 9/412:43 pmRAP - STL
1 stop7h 03mUnited Airlines
lun. 9/85:15 amSTL - RAP
1 stop4h 51mUnited Airlines
Deal found 8/20$332

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 agosto 20, 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

jue. 9/25

6:12 pm-9:30 pm

Nonstop2h 18m

Chicago O'Hare Intl

dom. 9/28

4:17 pm-5:42 pm

Nonstop2h 25m

$200

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

mar. 9/16

1:35 pm-4:56 pm

Nonstop2h 21m

Chicago O'Hare Intl

mar. 9/23

8:53 am-10:22 am

Nonstop2h 29m

$209

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

sáb. 9/20

5:59 pm-11:59 pm

1 stop5h 00m

Chicago O'Hare Intl

mar. 9/23

8:53 am-10:22 am

Nonstop2h 29m

$219

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

mar. 10/21

11:15 am-6:25 pm

1 stop6h 10m

Chicago O'Hare Intl

sáb. 10/25

8:45 am-10:13 am

Nonstop2h 28m

$219

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

mié. 11/12

8:45 am-4:58 pm

1 stop7h 13m

Chicago O'Hare Intl

sáb. 11/15

8:45 am-10:34 am

Nonstop2h 49m

$219

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

lun. 10/20

1:44 pm-5:05 pm

Nonstop2h 21m

Chicago O'Hare Intl

sáb. 10/25

8:45 am-10:13 am

Nonstop2h 28m

$229

Rapid CityChicago

RAP - MDW

RAPMDW

Rapid City

sáb. 8/23

10:55 am-5:37 pm

1 stop5h 42m

Chicago Midway

lun. 8/25

7:17 pm-10:32 pm

1 stop4h 15m

$286

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

jue. 12/18

4:35 pm-11:02 pm

1 stop5h 27m

Lambert-St Louis

mar. 1/6

6:30 am-10:05 am

1 stop4h 35m

$294

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

mié. 9/3

4:25 pm-11:23 pm

1 stop5h 58m

Lambert-St Louis

sáb. 9/6

7:00 am-11:37 am

1 stop5h 37m

$299

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

mar. 9/2

12:50 pm-7:21 pm

1 stop5h 31m

Lambert-St Louis

sáb. 9/6

3:59 pm-8:53 pm

1 stop5h 54m

$309

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/19

Showing 1-10 of 36 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 agosto 20, 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 agosto 20, 2025.

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

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 agosto 20, 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
7,982 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

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
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

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
8,928 reviews
Delta
8.0
Very good
7,982 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

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
7,982 reviews

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

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 $200, American Airlines can have you in Illinois from Rapid City in 2h 18m. Airlines will cover a distance of 777 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 - Chicago Midway or Rapid City - Lambert-St Louis.

  • 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 United Airlines (80%), Emirates (73%) or Air New Zealand (73%) 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 $668 for a flight from Rapid City to Illinois. The cheapest flight overall is $152 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.

See more FAQs

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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 agosto 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$189Average$219FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$210Average$350FlexibilityNo cancel feeOn-time69%
DeltaCheapest$228Average$358FlexibilityNo cancel feeOn-timeN/A

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