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$127+ 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 8/2. Fares are subject to change and may not be available on all flights or dates of travel.
RAP — ORD
Jun 17 — Jun 241
Wed 6/17
Wed 6/24
1 adult, Economy
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Cheap 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 May 18, 2026.

This United Airlines deal was found by Cheapflights users on 5/15. 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 8/41:35 pm
RAP
-
ORD
Nonstop2h 24m
United Airlines
Tue 8/118:58 am
ORD
-
RAP
Nonstop2h 28m
United Airlines
Deal found 5/15$191
This American Airlines deal was found by Cheapflights users on 5/16. 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.
Wed 7/15:00 pm
RAP
-
ORD
1 stop6h 39m
American Airlines
Sat 7/49:40 am
ORD
-
RAP
Nonstop2h 34m
American Airlines
Deal found 5/16$201
This United Airlines deal was found by Cheapflights users on 5/14. 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.
Sat 7/41:35 pm
RAP
-
ORD
Nonstop2h 24m
United Airlines
Tue 7/79:30 pm
ORD
-
RAP
Nonstop2h 46m
United Airlines
Deal found 5/14$207
This American Airlines deal was found by Cheapflights users on 5/13. 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.
Wed 9/236:11 pm
RAP
-
ORD
Nonstop2h 19m
American Airlines
Mon 9/289:40 am
ORD
-
RAP
Nonstop2h 28m
American Airlines
Deal found 5/13$222
This United Airlines deal was found by Cheapflights users on 5/17. 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.
Thu 6/181:35 pm
RAP
-
ORD
Nonstop2h 24m
United Airlines
Tue 6/235:00 am
ORD
-
RAP
1 stop5h 20m
United Airlines
Deal found 5/17$232
This Delta deal was found by Cheapflights users on 5/14. 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 7/211:00 am
RAP
-
ORD
1 stop5h 02m
Delta
Tue 7/2812:27 pm
ORD
-
RAP
1 stop4h 02m
Delta
Deal found 5/14$242
This Delta deal was found by Cheapflights users on 5/14. 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 7/211:00 am
RAP
-
MDW
1 stop6h 18m
Delta
Tue 7/289:49 am
MDW
-
RAP
1 stop6h 40m
Delta
Deal found 5/14$242
This United Airlines deal was found by Cheapflights users on 5/18. 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.
Mon 7/201:35 pm
RAP
-
ORD
Nonstop2h 24m
United Airlines
Sat 7/256:00 am
ORD
-
RAP
1 stop7h 29m
United Airlines
Deal found 5/18$248
This United Airlines deal was found by Cheapflights users on 5/15. 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.
Thu 6/255:53 pm
RAP
-
ORD
1 stop5h 51m
United Airlines
Sun 6/289:30 pm
ORD
-
RAP
Nonstop2h 46m
United Airlines
Deal found 5/15$263
This Delta deal was found by Cheapflights users on 5/14. 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.
Tue 7/286:48 am
RAP
-
MDW
1 stop5h 21m
Delta
Tue 8/47:25 pm
MDW
-
RAP
1 stop4h 12m
Delta
Deal found 5/14$270
This American Airlines deal was found by Cheapflights users on 5/18. 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.
Sat 5/2312:47 pm
RAP
-
ORD
Nonstop2h 30m
American Airlines
Tue 5/261:19 pm
ORD
-
RAP
Nonstop2h 34m
American Airlines
Deal found 5/18$271
This American Airlines deal was found by Cheapflights users on 5/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/293:26 pm
RAP
-
ORD
Nonstop2h 34m
American Airlines
Sat 8/85:00 am
ORD
-
RAP
1 stop5h 49m
American Airlines
Deal found 5/15$272

Find 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 May 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$191
(United Airlines)

One-way from

$127
(United Airlines)

Popular in

January

Cheapest in

February

Average price

$334

Good round-trip deal

$390 or less

Good one-way deal

$249 or less
Provider with most accurate pricing for Rapid City-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Rapid City-Chicago (CHI) flights.
Search Deals
From Rapid City to Illinois
Search Deals
One-way flight from Rapid City to Illinois
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($24 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals
Price to beat on a round-trip flight from Rapid City to Illinois.
Search Deals
Price to beat on a one-way flight from Rapid City to Illinois.
Search Deals

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 May 18, 2026.
Use the filters below to find and compare flights from Rapid City to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Tue 8/4

1:35 pm-4:59 pm

Nonstop2h 24m

Chicago O'Hare Intl

Tue 8/11

8:58 am-10:26 am

Nonstop2h 28m

$191

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Wed 9/23

6:11 pm-9:30 pm

Nonstop2h 19m

Chicago O'Hare Intl

Mon 9/28

5:00 am-10:49 am

1 stop6h 49m

$232

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Thu 6/18

1:35 pm-4:59 pm

Nonstop2h 24m

Chicago O'Hare Intl

Tue 6/23

5:00 am-9:20 am

1 stop5h 20m

$232

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Thu 6/25

5:53 pm-12:44 am

1 stop5h 51m

Chicago O'Hare Intl

Sun 6/28

9:30 pm-11:16 pm

Nonstop2h 46m

$263

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Wed 7/1

6:00 am-9:34 am

Nonstop2h 34m

Chicago O'Hare Intl

Wed 7/8

8:45 am-10:24 am

Nonstop2h 39m

$296

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 11/12

4:00 pm-11:18 pm

1 stop6h 18m

Lambert-St Louis

Mon 11/16

9:45 am-1:52 pm

1 stop5h 07m

$309

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 11/11

4:00 pm-11:18 pm

1 stop6h 18m

Lambert-St Louis

Sun 11/15

9:45 am-1:52 pm

1 stop5h 07m

$309

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Tue 7/21

1:35 pm-4:59 pm

Nonstop2h 24m

Chicago O'Hare Intl

Thu 7/23

5:00 am-9:19 am

1 stop5h 19m

$309

Rapid CityChicago

RAP - MDW

RAPMDW

Rapid City

Wed 7/1

6:48 am-1:09 pm

1 stop5h 21m

Chicago Midway

Wed 7/8

7:06 pm-10:26 pm

1 stop4h 20m

$365

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Fri 7/17

12:35 pm-8:43 pm

1 stop7h 08m

Lambert-St Louis

Wed 7/22

7:05 pm-11:16 pm

1 stop5h 11m

$371

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/15

Showing 1-10 of 40 resultsSorted by cheapest first
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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, April is the cheapest month in which you can book a flight from Rapid City to Illinois (average of $187). Flying from Rapid City to Illinois in January is currently the most expensive (average of $248). 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 May 18, 2026.

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.

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 May 18, 2026.
Peruse reviews from past customers who have flown with Delta,United Airlines, andAmerican 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
7.9
Good
8,447 reviews

Comfort

7.8

Boarding

8.1

Entertainment

7.8

Food

7.2

Crew

8.5

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Delta
7.9
Good
8,447 reviews
Delta
7.9
Good
8,447 reviews

Comfort

7.8

Boarding

8.1

Entertainment

7.8

Food

7.2

Crew

8.5

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
United Airlines
7.4
Good
9,737 reviews
Delta
7.9
Good
8,447 reviews

Comfort

7.8

Boarding

8.1

Entertainment

7.8

Food

7.2

Crew

8.5

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
American Airlines
7.1
Good
11,648 reviews
Delta
7.9
Good
8,447 reviews

Comfort

7.8

Boarding

8.1

Entertainment

7.8

Food

7.2

Crew

8.5

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

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 $232, United Airlines can have you in Illinois from Rapid City in 2h 19m. 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 American Airlines (80%), Envoy Air (80%) or Qatar Airways (75%) 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 $413 for a flight from Rapid City to Illinois. The cheapest flight overall is $188 while the most popular route, (Rapid City - Chicago O'Hare Intl) is currently priced at $231.

  • 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, April is the cheapest month in which you can book a flight from Rapid City to Illinois (average of $187). Flying from Rapid City to Illinois in January is currently the most expensive (average of $248). 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 2 airlines flying from Rapid City to Illinois

Discover the top 2 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 May 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$187Average$239FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$219Average$339FlexibilityNo cancel feeOn-time69%

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