HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$83+ Cheap flights from Raleigh (RDU) 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 5/1. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — ORD
Apr 7 — Apr 141
Mon 4/7
Mon 4/14
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Raleigh to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Raleigh to Illinois

Keep the following information in mind while searching for Raleigh to Illinois flight deals. Data was last updated April 2, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$199
(American Airlines)

One-way from

$83
(Booking.com)

Popular in

March

Cheapest in

August

Average price

$268

Good round-trip deal

$333 or less

Good one-way deal

$159 or less
Provider with most accurate pricing for Raleigh-Durham-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Raleigh-Durham-Chicago (CHI) flights.
Search Deals
From Raleigh-Durham to Illinois
Search Deals
One-way flight from Raleigh-Durham to Illinois
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($61 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals
Price to beat on a round-trip flight from Raleigh-Durham to Illinois.
Search Deals
Price to beat on a one-way flight from Raleigh-Durham to Illinois.
Search Deals

Find flight deals from Raleigh to Illinois

Cheapest flights from Raleigh to Illinois
Explore the most affordable flight options available from Raleigh to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 2, 2025.

This American Airlines deal was found by Cheapflights users on 4/2. 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 5/246:00 amRDU - MLI
1 stop5h 42mAmerican Airlines
Sun 5/255:00 amMLI - RDU
1 stop5h 55mAmerican Airlines
Deal found 4/2$199
This CheapOair deal was found by Cheapflights users on 4/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2910:01 amRDU - STL
1 stop15h 03mFrontier
Fri 5/165:55 pmSTL - RDU
1 stop19h 04mFrontier
Deal found 4/1$200
This Mytrip deal was found by Cheapflights users on 4/1. 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.
Fri 5/910:17 amRDU - STL
1 stop23h 58mSpirit Airlines
Sun 5/1110:10 amSTL - RDU
1 stop22h 02mSpirit Airlines
Deal found 4/1$208
This American Airlines deal was found by Cheapflights users on 4/1. 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 4/194:09 pmRDU - PIA
1 stop6h 54mAmerican Airlines
Fri 5/25:16 pmPIA - RDU
1 stop3h 58mAmerican Airlines
Deal found 4/1$224
This Booking.com deal was found by Cheapflights users on 3/31. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/25:28 pmRDU - STL
1 stop17h 31mMultiple Airlines
Sun 5/48:00 amSTL - RDU
1 stop7h 29mMultiple Airlines
Deal found 3/31$239
This Priceline deal was found by Cheapflights users on 4/1. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/145:36 pmRDU - ORD
1 stop8h 22mMultiple Airlines
Sat 4/196:45 amORD - RDU
1 stop8h 39mMultiple Airlines
Deal found 4/1$241
This Cheapflightsfares deal was found by Cheapflights users on 4/1. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1011:29 amRDU - ORD
1 stop7h 58mSpirit Airlines
Mon 4/145:36 amORD - RDU
1 stop10h 05mSpirit Airlines
Deal found 4/1$242
This United Airlines deal was found by Cheapflights users on 4/1. 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 6/281:33 pmRDU - ORD
Nonstop2h 22mUnited Airlines
Wed 7/26:20 pmORD - RDU
Nonstop2h 07mUnited Airlines
Deal found 4/1$244
This American Airlines deal was found by Cheapflights users on 4/2. 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 6/65:34 amRDU - ORD
1 stop5h 03mAmerican Airlines
Wed 6/116:55 pmORD - RDU
Nonstop2h 04mAmerican Airlines
Deal found 4/2$246
This Southwest deal was found by Cheapflights users on 4/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/98:20 amRDU - MDW
2 stops6h 55mSouthwest
Sun 7/138:55 pmMDW - RDU
Nonstop1h 50mSouthwest
Deal found 4/1$247
This Delta deal was found by Cheapflights users on 4/1. 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 6/2812:26 pmRDU - MDW
1 stop4h 13mDelta
Tue 7/16:00 amMDW - RDU
1 stop4h 21mDelta
Deal found 4/1$248
This Cheapflightsfares deal was found by Cheapflights users on 4/2. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/193:38 pmRDU - ORD
Nonstop2h 37mFrontier
Sun 6/2211:32 amORD - RDU
Nonstop2h 07mFrontier
Deal found 4/2$249

Cheapflights Fare Finder

Customize your flight search to find flights from Raleigh 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 April 2, 2025.
Use the filters below to find and compare flights from Raleigh to Illinois that are best for you.

Fly from

Raleigh

Fly to

Illinois

Route

Depart

Return

Price

RaleighMoline

RDU - MLI

RDUMLI

Raleigh-Durham

Sat 5/24

6:00 am-10:42 am

1 stop5h 42m

Moline Quad-City

Sun 5/25

5:00 am-11:55 am

1 stop5h 55m

$199

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Tue 4/29

10:01 am-12:04 am

1 stop15h 03m

Lambert-St Louis

Fri 5/16

5:55 pm-1:59 pm

1 stop19h 04m

$200

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Fri 5/9

10:17 am-9:15 am

1 stop23h 58m

Lambert-St Louis

Sun 5/11

10:10 am-9:12 am

1 stop22h 02m

$208

RaleighPeoria

RDU - PIA

RDUPIA

Raleigh-Durham

Sat 4/19

4:09 pm-10:03 pm

1 stop6h 54m

Greater Peoria

Fri 5/2

5:16 pm-10:14 pm

1 stop3h 58m

$224

RaleighSt. Louis

RDU - STL

RDUSTL

Raleigh-Durham

Fri 5/2

5:28 pm-9:59 am

1 stop17h 31m

Lambert-St Louis

Sun 5/4

8:00 am-4:29 pm

1 stop7h 29m

$239

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Mon 4/14

5:36 pm-12:58 am

1 stop8h 22m

Chicago O'Hare Intl

Sat 4/19

6:45 am-4:24 pm

1 stop8h 39m

$241

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Thu 5/8

8:50 am-7:17 pm

2 stops35h 27m

Chicago O'Hare Intl

Sun 5/11

7:35 pm-9:12 am

1 stop12h 37m

$242

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sat 6/28

1:33 pm-2:55 pm

Nonstop2h 22m

Chicago O'Hare Intl

Wed 7/2

6:20 pm-9:27 pm

Nonstop2h 07m

$244

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Fri 6/6

5:34 am-9:37 am

1 stop5h 03m

Chicago O'Hare Intl

Wed 6/11

6:55 pm-9:59 pm

Nonstop2h 04m

$246

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Wed 7/9

8:20 am-2:15 pm

2 stops6h 55m

Chicago Midway

Sun 7/13

8:55 pm-11:45 pm

Nonstop1h 50m

$247

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

Showing 1-10 of 53 results
1
2
3
...
6

Best time to book a flight from Raleigh to Illinois

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

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

Currently, August is the cheapest month in which you can book a flight from Raleigh to Illinois (average of $245). Flying from Raleigh 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 RDU to IL?

Find hourly flight availability from Raleigh 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 April 2, 2025.

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

Weekly flight availability from Raleigh to Illinois

Explore weekly flight availability from Raleigh 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 April 2, 2025.

The most flights from RDU to USIL are scheduled on a Monday (30 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 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 April 2, 2025.
To help decide which airline to fly from Raleigh to Illinois, see what other customers have to say about Southwest, Delta and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,272 reviews

Crew

8.6

Food

7.1

Comfort

8.0

Entertainment

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.0
Very good
4,272 reviews
Southwest
8.0
Very good
4,272 reviews

Crew

8.6

Food

7.1

Comfort

8.0

Entertainment

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,897 reviews
Southwest
8.0
Very good
4,272 reviews

Crew

8.6

Food

7.1

Comfort

8.0

Entertainment

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,616 reviews
Southwest
8.0
Very good
4,272 reviews

Crew

8.6

Food

7.1

Comfort

8.0

Entertainment

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,272 reviews

Crew

8.6

Food

7.1

Comfort

8.0

Entertainment

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Sun Country Air
6.9
Okay
349 reviews
Southwest
8.0
Very good
4,272 reviews

Crew

8.6

Food

7.1

Comfort

8.0

Entertainment

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

Find useful and relevant information for your journey from Raleigh 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 Raleigh to Illinois?

    Most people fly from Raleigh-Durham (RDU) if they book a flight from Raleigh to Illinois. Raleigh-Durham is conveniently located just 11.1 mi from Raleigh’s city center.

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

    For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $83. Users have also found prices from $95 and $133 on Frontier and Sun Country Air, respectively.

  • What are the most popular routes from Raleigh to Illinois?

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

  • What are the most reliable airlines from Raleigh to Illinois?

    No one likes to see their flight delayed. When booking a flight from Raleigh to Illinois consider choosing Royal Jordanian (92%), Japan Airlines (89%) or ANA (88%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Raleigh to Illinois?

    Looking at all options, your cheapest flight can be booked for $134. While the most popular route (Raleigh-Durham - Chicago O'Hare Intl) can be booked for $126 on average our data indicates $2,054 when flying from Raleigh to Illinois.

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

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

  • How can I find direct flights from Raleigh to Illinois?

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

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

    Yes. Cheapflights offers flight deals from Raleigh 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 Raleigh to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Raleigh to Illinois (average of $245). Flying from Raleigh 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Raleigh to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Charlotte to John F Kennedy Intl flights
Raleigh to Seattle flights
Raleigh to John F Kennedy Intl flights
Charlotte to LaGuardia flights
Raleigh to LaGuardia flights
Charlotte to Hobby flights
Charlotte to Newark flights
Charlotte to Denver flights
Charlotte to Boston flights
Raleigh to Newark flights
Charlotte to Seattle flights
Raleigh to Miami flights
Charlotte to O'Hare Intl flights
Raleigh to O'Hare Intl flights
Raleigh to Denver flights
Raleigh to Hobby flights
Raleigh to Las Vegas flights
Charlotte to George Bush Intcntl flights
Raleigh to Orlando flights
Charlotte to Fort Lauderdale flights
Raleigh to Fort Lauderdale flights
Charlotte to Dulles Intl flights
Raleigh to Nashville flights
Charlotte to Orlando flights
Charlotte to Las Vegas flights
Raleigh to Los Angeles flights
Raleigh to George Bush Intcntl flights
Raleigh to Austin flights
Raleigh to Boston flights
Raleigh to San Francisco flights
Raleigh to Dallas/Fort Worth flights
Charlotte to Dallas/Fort Worth flights
Charlotte to San Antonio flights
Raleigh to San Antonio flights
Charlotte to Miami flights
Charlotte to Sky Harbor Intl flights
Raleigh to Atlanta flights
Raleigh to Islip flights
Charlotte to Austin flights
Charlotte to Salt Lake City flights
Norfolk to Hobby flights
Raleigh to Midway flights
Raleigh to Dulles Intl flights
Charlotte to San Francisco flights
Charlotte to Reagan-National flights
Greensboro to O'Hare Intl flights
Raleigh to Sky Harbor Intl flights
Raleigh to Tampa flights
Charlotte to Los Angeles flights
Norfolk to Las Vegas flights

Top 6 airlines flying from Raleigh to Illinois

Discover the top 6 airlines that operate flights from Raleigh 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 April 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$38Average$130FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$98Average$249FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$138Average$352FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$145Average$380FlexibilityNo cancel feeOn-time71%
DeltaCheapest$155Average$414FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$166Average$334FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.