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$131+ 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 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
RAP — ORD
Aug 29 — Sep 51
Sat 8/29
Sat 9/5
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 July 30, 2026.

This United Airlines deal was found by Cheapflights users on 7/25. 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 8/261:31 pm
RAP
-
ORD
Nonstop2h 24m
United Airlines
Tue 9/13:56 pm
ORD
-
RAP
1 stop7h 37m
United Airlines
Deal found 7/25$271
This American Airlines deal was found by Cheapflights users on 7/26. 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 8/283:21 pm
RAP
-
ORD
Nonstop2h 39m
American Airlines
Sun 8/309:43 am
ORD
-
RAP
Nonstop2h 32m
American Airlines
Deal found 7/26$279
This American Airlines deal was found by Cheapflights users on 7/25. 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 9/43:20 pm
RAP
-
ORD
Nonstop2h 39m
American Airlines
Sat 9/51:50 pm
ORD
-
RAP
1 stop8h 45m
American Airlines
Deal found 7/25$280
This United Airlines deal was found by Cheapflights users on 7/26. 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 10/711:17 am
RAP
-
ORD
1 stop7h 12m
United Airlines
Wed 10/148:47 am
ORD
-
RAP
Nonstop2h 28m
United Airlines
Deal found 7/26$287
This American Airlines deal was found by Cheapflights users on 7/25. 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 9/512:39 pm
RAP
-
ORD
1 stop6h 03m
American Airlines
Sun 9/63:54 pm
ORD
-
RAP
1 stop7h 10m
American Airlines
Deal found 7/25$289
This United Airlines deal was found by Cheapflights users on 7/30. 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 9/21:31 pm
RAP
-
ORD
Nonstop2h 24m
United Airlines
Wed 9/95:55 am
ORD
-
RAP
1 stop7h 29m
United Airlines
Deal found 7/30$298
This United Airlines deal was found by Cheapflights users on 7/29. 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 8/201:31 pm
RAP
-
ORD
Nonstop2h 24m
United Airlines
Wed 8/268:58 am
ORD
-
RAP
Nonstop2h 28m
United Airlines
Deal found 7/29$299
This American Airlines deal was found by Cheapflights users on 7/26. 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 9/244:56 pm
RAP
-
STL
1 stop5h 47m
American Airlines
Sun 9/277:27 am
STL
-
RAP
1 stop4h 48m
American Airlines
Deal found 7/26$319
This United Airlines deal was found by Cheapflights users on 7/29. 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 8/3111:22 am
RAP
-
STL
1 stop4h 12m
United Airlines
Sat 9/54:40 pm
STL
-
RAP
1 stop6h 48m
United Airlines
Deal found 7/29$339
This American Airlines deal was found by Cheapflights users on 7/27. 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.
Tue 8/115:06 pm
RAP
-
STL
1 stop5h 36m
American Airlines
Sat 8/155:11 pm
STL
-
RAP
1 stop5h 24m
American Airlines
Deal found 7/27$349
This American Airlines deal was found by Cheapflights users on 7/26. 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 10/75:04 pm
RAP
-
STL
1 stop5h 38m
American Airlines
Wed 10/145:00 am
STL
-
RAP
2 stops12h 25m
American Airlines
Deal found 7/26$350
This Delta deal was found by Cheapflights users on 7/30. 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 9/210:46 am
RAP
-
MDW
1 stop6h 15m
Delta
Wed 9/97:13 pm
MDW
-
RAP
1 stop4h 05m
Delta
Deal found 7/30$360

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 July 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$271
(United Airlines)

One-way from

$131
(American Airlines)

Popular in

January

Cheapest in

June

Average price

$362

Good round-trip deal

$379 or less

Good one-way deal

$323 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. 4% potential increase in price ($17 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 July 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 July 30, 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

Thu 9/3

1:31 pm-4:55 pm

Nonstop2h 24m

Chicago O'Hare Intl

Mon 9/7

8:58 am-10:26 am

Nonstop2h 28m

$279

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Thu 9/24

1:37 pm-5:01 pm

Nonstop2h 24m

Chicago O'Hare Intl

Mon 9/28

8:47 am-10:15 am

Nonstop2h 28m

$279

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Wed 8/26

5:00 am-11:28 am

1 stop5h 28m

Chicago O'Hare Intl

Tue 9/1

3:56 pm-8:37 pm

1 stop5h 41m

$281

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Fri 8/28

12:30 pm-6:32 pm

1 stop5h 02m

Chicago O'Hare Intl

Sun 8/30

5:00 am-9:28 am

1 stop5h 28m

$299

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Thu 8/20

3:27 pm-10:46 pm

1 stop6h 19m

Chicago O'Hare Intl

Wed 8/26

8:58 am-10:26 am

Nonstop2h 28m

$309

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Fri 10/16

11:29 am-7:34 pm

1 stop7h 05m

Chicago O'Hare Intl

Fri 10/30

9:59 am-3:58 pm

1 stop6h 59m

$319

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Thu 9/3

1:31 pm-4:55 pm

Nonstop2h 24m

Chicago O'Hare Intl

Sun 9/6

3:56 pm-10:33 pm

1 stop7h 37m

$329

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 9/24

4:56 pm-11:43 pm

1 stop5h 47m

Lambert-St Louis

Sun 9/27

7:27 am-11:15 am

1 stop4h 48m

$339

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Mon 8/31

11:22 am-4:34 pm

1 stop4h 12m

Lambert-St Louis

Sat 9/5

4:40 pm-10:28 pm

1 stop6h 48m

$339

Rapid CityChicago

RAP - MDW

RAPMDW

Rapid City

Wed 9/2

10:46 am-6:01 pm

1 stop6h 15m

Chicago Midway

Wed 9/9

7:13 pm-10:18 pm

1 stop4h 05m

$360

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 46 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 $209). Flying from Rapid City to Illinois in January is currently the most expensive (average of $536). 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 July 30, 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.

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 July 30, 2026.

The most flights from RAP to USIL are scheduled on a Thursday (9 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).

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

Airfare is below average for this route at the moment.
Rapid City to Illinois flights typically cost between $281 and $351 in August.
The cheapest round-trip price found within the last 5 days was $271 on United Airlines (Aug 26-Sep 1).

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 July 30, 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
7.8
Good
8,487 reviews

Food

7.2

Entertainment

7.8

Crew

8.5

Boarding

8.1

Overall

7.8

Comfort

7.8

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
7.8
Good
8,487 reviews
Delta
7.8
Good
8,487 reviews

Food

7.2

Entertainment

7.8

Crew

8.5

Boarding

8.1

Overall

7.8

Comfort

7.8

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
10,046 reviews
Delta
7.8
Good
8,487 reviews

Food

7.2

Entertainment

7.8

Crew

8.5

Boarding

8.1

Overall

7.8

Comfort

7.8

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
11,841 reviews
Delta
7.8
Good
8,487 reviews

Food

7.2

Entertainment

7.8

Crew

8.5

Boarding

8.1

Overall

7.8

Comfort

7.8

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 $279, United Airlines can have you in Illinois from Rapid City in 2h 24m. 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 - 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 American Airlines (77%), Envoy Air (77%) 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 $443 for a flight from Rapid City to Illinois. The cheapest flight overall is $209 while the most popular route, (Rapid City - Chicago O'Hare Intl) is currently priced at $279.

  • 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 $209). Flying from Rapid City to Illinois in January is currently the most expensive (average of $536). 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 July 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$187Average$297FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$230Average$335FlexibilityNo cancel feeOn-time69%

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