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$110+ 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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
RAP — ORD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$193
(American Airlines)

One-way from

$110
(American Airlines)

Popular in

April

Cheapest in

August

Average price

$343

Good round-trip deal

$348 or less

Good one-way deal

$199 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. 14% potential increase in price ($64 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This American Airlines deal was found by Cheapflights users on 6/12. 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.
Thu 7/106:01 pmRAP - ORD
Nonstop2h 17mAmerican Airlines
Mon 7/144:13 pmORD - RAP
Nonstop2h 18mAmerican Airlines
Deal found 6/12$193
This United Airlines deal was found by Cheapflights users on 6/12. 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.
Fri 7/41:43 pmRAP - ORD
Nonstop2h 20mUnited Airlines
Sun 7/68:45 amORD - RAP
Nonstop2h 35mUnited Airlines
Deal found 6/12$200
This Delta deal was found by Cheapflights users on 6/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1510:40 amRAP - ORD
1 stop5h 07mDelta
Sat 1/103:50 pmORD - RAP
1 stop7h 24mDelta
Deal found 6/12$229
This United Airlines deal was found by Cheapflights users on 6/11. 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 6/265:30 amRAP - STL
1 stop6h 16mUnited Airlines
Mon 6/305:15 amSTL - RAP
1 stop4h 49mUnited Airlines
Deal found 6/11$259
This American Airlines deal was found by Cheapflights users on 6/10. 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 9/171:03 pmRAP - STL
1 stop7h 50mAmerican Airlines
Sun 9/217:23 amSTL - RAP
1 stop6h 10mAmerican Airlines
Deal found 6/10$298
This Delta deal was found by Cheapflights users on 6/11. 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 9/66:25 amRAP - MDW
1 stop5h 38mDelta
Sat 9/206:45 pmMDW - RAP
1 stop4h 25mDelta
Deal found 6/11$299
This Mytrip deal was found by Cheapflights users on 6/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/69:49 pmRAP - ORD
1 stop12h 01mMultiple Airlines
Wed 7/94:36 pmORD - RAP
2 stops29h 33mMultiple Airlines
Deal found 6/11$358
This Mytrip deal was found by Cheapflights users on 6/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/263:32 pmRAP - MDW
2 stops26h 52mAllegiant Air
Sun 8/38:14 pmMDW - RAP
2 stops20h 37mAllegiant Air
Deal found 6/12$404
This American Airlines deal was found by Cheapflights users on 6/11. 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 6/116:14 pmRAP - BMI
1 stop28h 28mAmerican Airlines
Tue 6/173:51 pmBMI - RAP
1 stop6h 06mAmerican Airlines
Deal found 6/11$764
This Delta deal was found by Cheapflights users on 6/10. 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.
Sun 8/102:25 pmRAP - STL
2 stops8h 28mDelta
Thu 8/143:42 pmSTL - RAP
2 stops7h 49mDelta
Deal found 6/10$855

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 June 12, 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

Thu 7/10

6:01 pm-9:18 pm

Nonstop2h 17m

Chicago O'Hare Intl

Mon 7/14

4:13 pm-5:31 pm

Nonstop2h 18m

$193

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Fri 7/4

1:43 pm-5:03 pm

Nonstop2h 20m

Chicago O'Hare Intl

Sun 7/6

8:45 am-10:20 am

Nonstop2h 35m

$200

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Sat 11/15

10:40 am-4:47 pm

1 stop5h 07m

Chicago O'Hare Intl

Sat 1/10

3:50 pm-10:14 pm

1 stop7h 24m

$229

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Thu 6/26

5:30 am-12:46 pm

1 stop6h 16m

Lambert-St Louis

Mon 6/30

5:15 am-9:04 am

1 stop4h 49m

$259

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Wed 9/17

1:03 pm-9:53 pm

1 stop7h 50m

Lambert-St Louis

Sun 9/21

7:23 am-12:33 pm

1 stop6h 10m

$298

Rapid CityChicago

RAP - MDW

RAPMDW

Rapid City

Sat 9/6

6:25 am-1:03 pm

1 stop5h 38m

Chicago Midway

Sat 9/20

6:45 pm-10:10 pm

1 stop4h 25m

$299

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Sun 7/6

9:49 pm-6:51 am

2 stops32h 02m

Chicago O'Hare Intl

Wed 7/9

4:36 pm-9:09 pm

2 stops29h 33m

$349

Rapid CityChicago

RAP - MDW

RAPMDW

Rapid City

Sat 7/26

3:32 pm-7:24 pm

2 stops26h 52m

Chicago Midway

Sun 8/3

8:14 pm-3:51 pm

2 stops20h 37m

$404

Rapid CitySt. Louis

RAP - STL

RAPSTL

Rapid City

Sun 8/10

2:25 pm-11:53 pm

2 stops8h 28m

Lambert-St Louis

Thu 8/14

3:42 pm-10:31 pm

2 stops7h 49m

$855

Rapid CityChicago

RAP - ORD

RAPORD

Rapid City

Wed 8/20

6:04 pm-9:24 pm

Nonstop2h 20m

$110

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 18 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 June 12, 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 June 12, 2025.

The most flights from RAP to USIL are scheduled on a Monday (9 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 June 12, 2025.
Read reviews from past customers who have flown Delta, United Airlines and Allegiant Air from Rapid City to Illinois. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

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
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

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
8,790 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

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!
Allegiant Air
7.3
Good
725 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

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
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

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!
Sun Country Air
6.9
Okay
345 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Crew

8.5

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.3

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.

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

    One-way options have recently been found by users for as low as $110 on American Airlines. Other airlines that offer cheap prices include Delta from $120 and Sun Country Air from $123 one-way.

  • 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 SkyWest Airlines (100%), Republic Airways (90%) or Emirates (89%) 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 $822 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 $229.

  • 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$189Average$263FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$226Average$345FlexibilityNo cancel feeOn-time69%
DeltaCheapest$228Average$349FlexibilityNo cancel feeOn-timeN/A

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