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$89+ 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 5/24. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — ORD
Apr 29 — May 61
Tue 4/29
Tue 5/6
1 adult, Economy
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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 24, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$181
(Cheapflightsfares)

One-way from

$89
(Frontier)

Popular in

March

Cheapest in

August

Average price

$308

Good round-trip deal

$314 or less

Good one-way deal

$148 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. 21% potential increase in price ($69 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($10 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.
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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 24, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 4/23. 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 5/228:50 amRDU - ORD
1 stop6h 16mSpirit Airlines
Sun 5/257:35 pmORD - RDU
1 stop12h 37mSpirit Airlines
Deal found 4/23$181
This FlightHub deal was found by Cheapflights users on 4/23. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/232:03 pmRDU - ORD
1 stop6h 11mMultiple Airlines
Thu 6/2611:32 amORD - RDU
Nonstop2h 04mMultiple Airlines
Deal found 4/23$182
This American Airlines deal was found by Cheapflights users on 4/23. 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 5/214:09 pmRDU - ORD
Nonstop2h 33mAmerican Airlines
Wed 5/286:40 amORD - RDU
Nonstop1h 58mAmerican Airlines
Deal found 4/23$184
This Southwest deal was found by Cheapflights users on 4/22. 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 7/26:30 amRDU - MDW
Nonstop1h 55mSouthwest
Thu 7/35:05 amMDW - RDU
1 stop3h 50mSouthwest
Deal found 4/22$184
This Cheapflightsfares deal was found by Cheapflights users on 4/23. 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.
Sat 5/317:16 pmRDU - ORD
1 stop5h 48mFrontier
Thu 6/511:32 amORD - RDU
Nonstop2h 04mFrontier
Deal found 4/23$187
This Frontier deal was found by Cheapflights users on 4/23. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/34:54 pmRDU - MDW
1 stop6h 50mFrontier
Fri 6/66:30 amMDW - RDU
1 stop8h 54mFrontier
Deal found 4/23$188
This United Airlines deal was found by Cheapflights users on 4/23. 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 5/315:16 pmRDU - ORD
Nonstop2h 24mUnited Airlines
Thu 6/56:25 pmORD - RDU
Nonstop2h 07mUnited Airlines
Deal found 4/23$193
This Delta deal was found by Cheapflights users on 4/24. 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 6/712:25 pmRDU - ORD
1 stop7h 23mDelta
Tue 6/1011:00 amORD - RDU
1 stop5h 38mDelta
Deal found 4/24$197
This Delta deal was found by Cheapflights users on 4/23. 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 6/712:25 pmRDU - MDW
1 stop3h 55mDelta
Sat 6/144:26 pmMDW - RDU
1 stop6h 54mDelta
Deal found 4/23$197
This American Airlines deal was found by Cheapflights users on 4/23. 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 6/75:56 pmRDU - PIA
1 stop6h 17mAmerican Airlines
Sat 6/144:06 pmPIA - RDU
1 stop4h 49mAmerican Airlines
Deal found 4/23$249
This Delta deal was found by Cheapflights users on 4/23. 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.
Fri 6/66:47 pmRDU - MLI
1 stop5h 10mDelta
Tue 6/105:28 pmMLI - RDU
1 stop5h 52mDelta
Deal found 4/23$249
This American Airlines deal was found by Cheapflights users on 4/22. 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 7/1212:44 pmRDU - MLI
2 stops6h 21mAmerican Airlines
Mon 7/216:36 pmMLI - RDU
1 stop4h 15mAmerican Airlines
Deal found 4/22$254

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 24, 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

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Thu 5/22

8:50 am-2:06 pm

1 stop6h 16m

Chicago O'Hare Intl

Sun 5/25

7:35 pm-9:12 am

1 stop12h 37m

$181

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Mon 6/23

2:03 pm-7:14 pm

1 stop6h 11m

Chicago O'Hare Intl

Thu 6/26

11:32 am-2:36 pm

Nonstop2h 04m

$182

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Wed 5/21

4:09 pm-5:42 pm

Nonstop2h 33m

Chicago O'Hare Intl

Wed 5/28

6:40 am-9:38 am

Nonstop1h 58m

$184

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Wed 7/2

6:30 am-7:25 am

Nonstop1h 55m

Chicago Midway

Thu 7/3

5:05 am-9:55 am

1 stop3h 50m

$184

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sat 5/31

7:16 pm-12:04 am

1 stop5h 48m

Chicago O'Hare Intl

Thu 6/5

11:32 am-2:36 pm

Nonstop2h 04m

$187

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Tue 6/3

4:54 pm-10:44 pm

1 stop6h 50m

Chicago Midway

Mon 6/9

6:30 am-4:23 pm

1 stop8h 53m

$188

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sat 5/31

5:16 pm-6:40 pm

Nonstop2h 24m

Chicago O'Hare Intl

Thu 6/5

6:25 pm-9:32 pm

Nonstop2h 07m

$193

RaleighChicago

RDU - ORD

RDUORD

Raleigh-Durham

Sat 6/7

12:25 pm-6:48 pm

1 stop7h 23m

Chicago O'Hare Intl

Tue 6/10

11:00 am-5:38 pm

1 stop5h 38m

$197

RaleighChicago

RDU - MDW

RDUMDW

Raleigh-Durham

Sat 6/7

12:25 pm-3:20 pm

1 stop3h 55m

Chicago Midway

Sat 6/14

4:26 pm-11:22 pm

1 stop5h 56m

$197

RaleighPeoria

RDU - PIA

RDUPIA

Raleigh-Durham

Sat 6/7

5:56 pm-11:13 pm

1 stop6h 17m

Greater Peoria

Sat 6/14

4:06 pm-9:55 pm

1 stop4h 49m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/23

Showing 1-10 of 56 results
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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 24, 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 24, 2025.

The most flights from RDU to USIL are scheduled on a Friday (30 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (17 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 24, 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
4,287 reviews

Comfort

8.0

Overall

8.0

Boarding

8.2

Crew

8.6

Entertainment

7.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
Southwest
8.0
Very good
4,287 reviews
Southwest
8.0
Very good
4,287 reviews

Comfort

8.0

Overall

8.0

Boarding

8.2

Crew

8.6

Entertainment

7.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
Delta
8.0
Very good
7,920 reviews
Southwest
8.0
Very good
4,287 reviews

Comfort

8.0

Overall

8.0

Boarding

8.2

Crew

8.6

Entertainment

7.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
United Airlines
7.4
Good
8,685 reviews
Southwest
8.0
Very good
4,287 reviews

Comfort

8.0

Overall

8.0

Boarding

8.2

Crew

8.6

Entertainment

7.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
JetBlue
7.3
Good
2,924 reviews
Southwest
8.0
Very good
4,287 reviews

Comfort

8.0

Overall

8.0

Boarding

8.2

Crew

8.6

Entertainment

7.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,287 reviews

Comfort

8.0

Overall

8.0

Boarding

8.2

Crew

8.6

Entertainment

7.6

Food

7.1

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

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 Frontier. According to our data, you can fly for as low as $89. Users have also found prices from $91 and $91 on United Airlines and Southwest, 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 SkyWest Airlines (100%), Republic Airways (88%) or ANA (85%) 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 $80. While the most popular route (Raleigh-Durham - Chicago O'Hare Intl) can be booked for $142 on average our data indicates $924 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

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Alternative routes for Raleigh to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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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 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$38Average$140FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$98Average$249FlexibilityNo cancel feeOn-time65%
DeltaCheapest$102Average$391FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$139Average$354FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$145Average$391FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$160Average$334FlexibilityNo cancel feeOn-time63%

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