$70+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — ORD
May 24 — May 311
Round-trip
1 adult, Economy
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Find cheap flights from Raleigh to Illinois with Cheapflights
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Cheapest flights from Raleigh to IllinoisExplore 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, 2026.
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, 2026.
This Priceline deal was found by Cheapflights users on 4/21. 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.
Tue 5/1212:59 pm
RDU
- STL
1 stop5h 34m
Frontier
Tue 5/196:33 pm
STL
- RDU
1 stop5h 00m
Frontier
Deal found 4/21![Frontier logo]()
$140
This Frontier deal was found by Cheapflights users on 4/20. 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 5/2612:54 pm
RDU
- STL
1 stop5h 39m
Frontier
Wed 5/275:27 pm
STL
- RDU
1 stop6h 06m
Frontier
Deal found 4/20![Frontier logo]()
$160
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/97:52 pm
RDU
- STL
1 stop5h 29m
Frontier
Tue 5/126:33 pm
STL
- RDU
1 stop5h 00m
Frontier
Deal found 4/22![Frontier logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 4/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/212:54 pm
RDU
- STL
1 stop5h 39m
Frontier
Fri 6/55:27 pm
STL
- RDU
1 stop5h 57m
Frontier
Deal found 4/20![Frontier logo]()
$174
This Frontier deal was found by Cheapflights users on 4/21. 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.
Thu 5/712:57 pm
RDU
- STL
1 stop4h 57m
Frontier
Sat 5/95:27 pm
STL
- RDU
1 stop6h 02m
Frontier
Deal found 4/21![Frontier logo]()
$180
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.
Thu 5/146:15 am
RDU
- STL
1 stop11h 39m
Frontier
Mon 5/184:19 pm
STL
- RDU
1 stop23h 47m
Frontier
Deal found 4/23![Frontier logo]()
$182
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/712:54 pm
RDU
- STL
1 stop21h 01m
Frontier
Wed 6/105:13 pm
STL
- RDU
1 stop6h 08m
Frontier
Deal found 4/22![Frontier logo]()
$183
This Priceline deal was found by Cheapflights users on 4/20. 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.
Tue 6/3012:54 pm
RDU
- STL
1 stop5h 36m
Frontier
Tue 7/76:33 pm
STL
- RDU
1 stop4h 56m
Frontier
Deal found 4/20![Frontier logo]()
$190
This Super.com 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/410:16 am
RDU
- ORD
1 stop13h 45m
Frontier
Mon 6/81:50 pm
ORD
- RDU
1 stop9h 34m
Frontier
Deal found 4/22![Frontier logo]()
$192
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/198:01 pm
RDU
- ORD
2 stops24h 50m
Frontier
Sun 5/241:50 pm
ORD
- RDU
1 stop9h 34m
Frontier
Deal found 4/22![Frontier logo]()
$193
This Frontier deal was found by Cheapflights users on 4/21. 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.
Thu 5/712:53 pm
RDU
- ORD
Nonstop2h 46m
Frontier
Sun 5/101:59 pm
ORD
- RDU
1 stop9h 25m
Frontier
Deal found 4/21![Frontier logo]()
$194
This Trip.com deal was found by Cheapflights users on 4/21. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/1410:15 pm
RDU
- MDW
1 stop18h 42m
Frontier
Sun 5/176:00 am
MDW
- RDU
1 stop5h 02m
Frontier
Deal found 4/21![Frontier logo]()
$194
Best flights from Raleigh to IllinoisDiscover carefully curated flight deals from Raleigh to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 24, 2026.
Discover carefully curated flight deals from Raleigh to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 24, 2026.
This Frontier deal was found by Cheapflights users on 4/19. 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 5/266:21 pm
RDU
- STL
1 stop6h 36m
Frontier
Wed 6/35:27 pm
STL
- RDU
1 stop6h 06m
Frontier
Deal found 4/19![Frontier logo]()
$160
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2810:15 pm
RDU
- RFD
1 stop21h 58m
Multiple Airlines
Mon 6/18:03 pm
RFD
- RDU
1 stop12h 18m
Multiple Airlines
Deal found 4/22![Multiple Airlines logo]()
$230
This Southwest deal was found by Cheapflights users on 4/20. 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.
Mon 9/148:25 am
RDU
- MDW
Nonstop1h 50m
Southwest
Wed 9/232:40 pm
MDW
- RDU
Nonstop1h 55m
Southwest
Deal found 4/20![Southwest logo]()
$232
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/277:30 am
RDU
- ORD
1 stop7h 17m
Delta
Sat 5/303:00 pm
ORD
- RDU
1 stop4h 42m
Delta
Deal found 4/22![Delta logo]()
$246
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.
Thu 6/46:00 am
RDU
- ORD
1 stop4h 36m
United Airlines
Tue 6/910:48 am
ORD
- RDU
Nonstop2h 13m
United Airlines
Deal found 4/23![United Airlines logo]()
$252
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 7/17:09 pm
RDU
- MLI
1 stop5h 43m
American Airlines
Sat 7/46:00 am
MLI
- RDU
2 stops7h 21m
American Airlines
Deal found 4/23![American Airlines logo]()
$266
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/57:53 pm
RDU
- RFD
1 stop14h 24m
Multiple Airlines
Sun 6/711:27 am
RFD
- RDU
2 stops11h 57m
Multiple Airlines
Deal found 4/22![Multiple Airlines logo]()
$240
This Southwest deal was found by Cheapflights users on 4/21. 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 5/206:40 pm
RDU
- MDW
Nonstop2h 00m
Southwest
Tue 5/264:40 pm
MDW
- RDU
1 stop4h 00m
Southwest
Deal found 4/21![Southwest logo]()
$243
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.
Sun 5/245:40 am
RDU
- MDW
1 stop4h 03m
Delta
Sun 5/246:36 pm
MDW
- RDU
1 stop3h 50m
Delta
Deal found 4/23![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 4/20. 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 5/238:00 am
RDU
- PIA
1 stop6h 57m
United Airlines
Tue 5/262:33 pm
PIA
- RDU
1 stop6h 04m
United Airlines
Deal found 4/20![United Airlines logo]()
$277
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/292:52 pm
RDU
- RFD
1 stop19h 29m
Multiple Airlines
Sun 5/3111:27 am
RFD
- RDU
2 stops11h 57m
Multiple Airlines
Deal found 4/23![Multiple Airlines logo]()
$257
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:15 am
RDU
- STL
Nonstop2h 05m
Southwest
Tue 9/110:15 am
STL
- RDU
Nonstop1h 50m
Southwest
Deal found 4/23![Southwest logo]()
$263
This United Airlines deal was found by Cheapflights users on 4/21. 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 5/2710:32 am
RDU
- ORD
1 stop5h 08m
United Airlines
Sun 5/317:38 am
ORD
- RDU
Nonstop2h 20m
United Airlines
Deal found 4/21![United Airlines logo]()
$279
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.
Wed 5/203:00 pm
RDU
- CMI
2 stops7h 35m
American Airlines
Wed 5/276:39 pm
CMI
- RDU
1 stop4h 15m
American Airlines
Deal found 4/22![American Airlines logo]()
$312
This Southwest deal was found by Cheapflights users on 4/21. 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 8/58:20 am
RDU
- MDW
Nonstop1h 50m
Southwest
Wed 8/1212:45 pm
MDW
- RDU
2 stops5h 05m
Southwest
Deal found 4/21![Southwest logo]()
$271
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/283:20 pm
RDU
- RFD
1 stop17h 25m
Multiple Airlines
Sun 5/3111:27 am
RFD
- RDU
2 stops19h 37m
Multiple Airlines
Deal found 4/23![Multiple Airlines logo]()
$285
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.
Tue 5/127:55 pm
RDU
- ORD
1 stop4h 49m
United Airlines
Wed 5/137:00 am
ORD
- RDU
Nonstop2h 07m
United Airlines
Deal found 4/23![United Airlines logo]()
$291
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.
Tue 5/264:15 pm
RDU
- BMI
1 stop7h 15m
Delta
Sat 5/304:14 pm
BMI
- RDU
1 stop4h 39m
Delta
Deal found 4/24![Delta logo]()
$329
This American Airlines deal was found by Cheapflights users on 4/20. 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 7/812:56 pm
RDU
- EVV
1 stop4h 14m
American Airlines
Sat 7/114:35 pm
EVV
- RDU
1 stop6h 24m
American Airlines
Deal found 4/20![American Airlines logo]()
$331
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 5/1311:15 am
RDU
- MDW
1 stop6h 45m
Southwest
Fri 5/156:55 pm
MDW
- RDU
Nonstop1h 50m
Southwest
Deal found 4/22![Southwest logo]()
$275
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.
Wed 5/2010:41 am
RDU
- ORD
1 stop6h 49m
United Airlines
Wed 5/279:10 am
ORD
- RDU
Nonstop2h 23m
United Airlines
Deal found 4/23![United Airlines logo]()
$291
This Kiwi.com deal was found by Cheapflights users on 4/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/12:36 pm
RDU
- RFD
2 stops18h 53m
Multiple Airlines
Sun 7/511:27 am
RFD
- RDU
1 stop23h 39m
Multiple Airlines
Deal found 4/21![Multiple Airlines logo]()
$292
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/207:30 am
RDU
- BMI
1 stop4h 53m
Delta
Wed 5/276:00 am
BMI
- RDU
1 stop4h 52m
Delta
Deal found 4/22![Delta logo]()
$329
This American Airlines deal was found by Cheapflights users on 4/20. 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 5/87:13 am
RDU
- BMI
1 stop4h 33m
American Airlines
Mon 5/115:00 am
BMI
- RDU
1 stop5h 11m
American Airlines
Deal found 4/20![American Airlines logo]()
$334
This Southwest deal was found by Cheapflights users on 4/19. 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.
Tue 5/196:40 pm
RDU
- MDW
Nonstop2h 00m
Southwest
Tue 5/267:40 am
MDW
- RDU
Nonstop1h 50m
Southwest
Deal found 4/19![Southwest logo]()
$277
This Kiwi.com deal was found by Cheapflights users on 4/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/3010:22 pm
RDU
- RFD
1 stop11h 51m
Multiple Airlines
Wed 7/14:47 pm
RFD
- RDU
1 stop15h 12m
Multiple Airlines
Deal found 4/20![Multiple Airlines logo]()
$295
This United Airlines deal was found by Cheapflights users on 4/21. 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.
Sun 5/248:00 am
RDU
- ORD
Nonstop2h 26m
United Airlines
Tue 5/266:25 pm
ORD
- RDU
Nonstop2h 12m
United Airlines
Deal found 4/21![United Airlines logo]()
$299
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.
Wed 9/235:20 am
RDU
- EVV
1 stop5h 02m
Delta
Tue 10/65:45 pm
EVV
- RDU
1 stop5h 38m
Delta
Deal found 4/23![Delta logo]()
$331
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.
Thu 5/145:45 am
RDU
- BMI
1 stop6h 01m
American Airlines
Sun 5/175:00 am
BMI
- RDU
2 stops8h 10m
American Airlines
Deal found 4/23![American Airlines logo]()
$334
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.
Thu 5/2111:10 am
RDU
- MDW
Nonstop1h 55m
Southwest
Sat 5/237:50 am
MDW
- RDU
Nonstop1h 50m
Southwest
Deal found 4/22![Southwest logo]()
$294
Last-minute flights from Raleigh to IllinoisDiscover last-minute flight deals from Raleigh to Illinois. Data last updated April 24, 2026 and is based on user searches.
Discover last-minute flight deals from Raleigh to Illinois. Data last updated April 24, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 4/21. 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.
Thu 5/712:57 pm
RDU
- STL
1 stop4h 57m
Frontier
Sat 5/95:27 pm
STL
- RDU
1 stop6h 02m
Frontier
Deal found 4/21![Frontier logo]()
$180
This Expedia deal was found by Cheapflights users on 4/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/712:53 pm
RDU
- ORD
Nonstop2h 46m
Frontier
Mon 5/115:30 pm
ORD
- RDU
1 stop22h 36m
Frontier
Deal found 4/21![Frontier logo]()
$194
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/97:52 pm
RDU
- STL
1 stop5h 29m
Frontier
Tue 5/126:33 pm
STL
- RDU
1 stop5h 00m
Frontier
Deal found 4/22![Frontier logo]()
$164
This Priceline deal was found by Cheapflights users on 4/21. 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.
Tue 5/1212:59 pm
RDU
- STL
1 stop5h 34m
Frontier
Tue 5/196:33 pm
STL
- RDU
1 stop5h 00m
Frontier
Deal found 4/21![Frontier logo]()
$140
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.
Thu 5/146:15 am
RDU
- STL
1 stop11h 39m
Frontier
Mon 5/184:19 pm
STL
- RDU
1 stop23h 47m
Frontier
Deal found 4/23![Frontier logo]()
$182
This Trip.com deal was found by Cheapflights users on 4/21. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/1410:15 pm
RDU
- MDW
1 stop18h 42m
Frontier
Sun 5/176:00 am
MDW
- RDU
1 stop5h 02m
Frontier
Deal found 4/21![Frontier logo]()
$194
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/156:15 am
RDU
- ORD
1 stop26h 40m
Frontier
Sun 5/175:49 pm
ORD
- RDU
1 stop12h 35m
Frontier
Deal found 4/23![Frontier logo]()
$195
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/198:01 pm
RDU
- ORD
2 stops24h 50m
Frontier
Sun 5/241:50 pm
ORD
- RDU
1 stop9h 34m
Frontier
Deal found 4/22![Frontier logo]()
$193
This Kiwi.com deal was found by Cheapflights users on 4/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2112:54 pm
RDU
- ORD
2 stops24h 43m
Frontier
Sun 5/241:50 pm
ORD
- RDU
1 stop17h 14m
Frontier
Deal found 4/20![Frontier logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 4/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2111:47 am
RDU
- ORD
1 stop12h 28m
Multiple Airlines
Tue 5/261:50 pm
ORD
- RDU
1 stop9h 43m
Multiple Airlines
Deal found 4/21![Multiple Airlines logo]()
$197
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/2311:56 am
RDU
- MDW
1 stop11h 06m
Frontier
Mon 5/256:00 am
MDW
- RDU
1 stop17h 24m
Frontier
Deal found 4/23![Frontier logo]()
$195
This Frontier deal was found by Cheapflights users on 4/20. 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 5/2612:54 pm
RDU
- STL
1 stop5h 39m
Frontier
Wed 5/275:27 pm
STL
- RDU
1 stop6h 06m
Frontier
Deal found 4/20![Frontier logo]()
$160
One-way flights from Raleigh to IllinoisSearch for one-way flight options from Raleigh to Illinois. Find affordable one-way fares based on user searches. Data last updated April 24, 2026.
Search for one-way flight options from Raleigh to Illinois. Find affordable one-way fares based on user searches. Data last updated April 24, 2026.
This Frontier deal was found by Cheapflights users on 4/20. 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 5/1912:59 pm
RDU
- STL
1 stop5h 34m
Frontier
Deal found 4/20![Frontier logo]()
$70
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/152:32 pm
RDU
- STL
1 stop10h 49m
Frontier
Deal found 4/23![Frontier logo]()
$76
This Frontier deal was found by Cheapflights users on 4/19. 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.
Sun 5/36:10 am
RDU
- STL
1 stop5h 21m
Frontier
Deal found 4/19![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 4/21. 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 6/2312:54 pm
RDU
- STL
1 stop5h 36m
Frontier
Deal found 4/21![Frontier logo]()
$95
This Frontier deal was found by Cheapflights users on 4/20. 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.
Mon 5/182:32 pm
RDU
- STL
1 stop10h 49m
Frontier
Deal found 4/20![Frontier logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 4/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/116:15 am
RDU
- STL
1 stop27h 37m
Frontier
Deal found 4/19![Frontier logo]()
$99
This United Airlines deal was found by Cheapflights users on 4/20. 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 5/2010:05 am
RDU
- ORD
Nonstop2h 26m
United Airlines
Deal found 4/20![United Airlines logo]()
$101
This Frontier deal was found by Cheapflights users on 4/20. 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 7/212:36 pm
RDU
- STL
1 stop10h 38m
Frontier
Deal found 4/20![Frontier logo]()
$101
This Southwest deal was found by Cheapflights users on 4/19. 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.
Tue 5/196:40 pm
RDU
- MDW
Nonstop2h 00m
Southwest
Deal found 4/19![Southwest logo]()
$102
This Kiwi.com deal was found by Cheapflights users on 4/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/1010:11 am
RDU
- ORD
1 stop14h 27m
Frontier
Deal found 4/21![Frontier logo]()
$103
This Trip.com deal was found by Cheapflights users on 4/20. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/1612:54 pm
RDU
- MDW
1 stop10h 17m
Frontier
Deal found 4/20![Frontier logo]()
$103
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/43:20 pm
RDU
- ORD
2 stops22h 17m
Multiple Airlines
Deal found 4/24![Multiple Airlines logo]()
$104
Find 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, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $140 (Priceline) |
One-way from | $70 (Frontier) |
Popular in | February |
Cheapest in | December |
Average price | $276 |
Good round-trip deal | $328 or less |
Good one-way deal | $179 or less |
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, 2026.
Use the filters below to find and compare flights from Raleigh to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
RaleighSt. Louis
RDU - STL
RDUSTL
Raleigh-Durham
Tue 5/26
6:21 pm-11:57 pm
1 stop6h 36m
Lambert-St Louis
Wed 6/3
5:27 pm-12:33 am
1 stop6h 06m
$160
RaleighChicago
RDU - RFD
RDURFD
Raleigh-Durham
Thu 5/28
10:15 pm-7:13 pm
1 stop21h 58m
Chicago Greater Rockford
Mon 6/1
8:03 pm-9:21 am
1 stop12h 18m
$230
Quickest round-trip
RaleighChicago
RDU - MDW
RDUMDW
Raleigh-Durham
Mon 9/14
8:25 am-9:15 am
Nonstop1h 50m
Chicago Midway
Wed 9/23
2:40 pm-5:35 pm
Nonstop1h 55m
$232
RaleighChicago
RDU - RFD
RDURFD
Raleigh-Durham
Fri 6/5
7:53 pm-9:17 am
1 stop14h 24m
Chicago Greater Rockford
Sun 6/7
11:27 am-12:24 am
2 stops11h 57m
$240
RaleighChicago
RDU - MDW
RDUMDW
Raleigh-Durham
Wed 5/20
6:40 pm-7:40 pm
Nonstop2h 00m
Chicago Midway
Tue 5/26
4:40 pm-9:40 pm
1 stop4h 00m
$243
RaleighChicago
RDU - ORD
RDUORD
Raleigh-Durham
Wed 5/27
7:30 am-1:47 pm
1 stop7h 17m
Chicago O'Hare Intl
Sat 5/30
3:00 pm-8:42 pm
1 stop4h 42m
$246
RaleighChicago
RDU - ORD
RDUORD
Raleigh-Durham
Thu 6/4
6:00 am-9:36 am
1 stop4h 36m
Chicago O'Hare Intl
Tue 6/9
10:48 am-2:01 pm
Nonstop2h 13m
$252
RaleighChicago
RDU - MDW
RDUMDW
Raleigh-Durham
Sun 5/24
5:40 am-8:43 am
1 stop4h 03m
Chicago Midway
Sun 5/24
6:36 pm-11:26 pm
1 stop3h 50m
$257
RaleighChicago
RDU - RFD
RDURFD
Raleigh-Durham
Fri 5/29
2:52 pm-9:21 am
1 stop19h 29m
Chicago Greater Rockford
Sun 5/31
11:27 am-12:24 am
2 stops11h 57m
$257
RaleighSt. Louis
RDU - STL
RDUSTL
Raleigh-Durham
Tue 8/25
6:15 am-7:20 am
Nonstop2h 05m
Lambert-St Louis
Tue 9/1
10:15 am-1:05 pm
Nonstop1h 50m
$263
Showing 1-10 of 60 resultsSorted by cheapest first
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.
RDU-STL
RDU-ORD
RDU-MDW
RDU-RFD
RDU-PIA
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
RDU-USIL
RDU-STL
RDU-ORD
RDU-MDW
RDU-RFD
How far ahead should I book a flight from Raleigh to Illinois?
To ensure you get the cheapest price possible for a flight from Raleigh to Illinois, you should look to book at least 81 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Raleigh to Illinois?
Currently, January is the cheapest month in which you can book a flight from Raleigh to Illinois (average of $33). Flying from Raleigh to Illinois in May is currently the most expensive (average of $500). 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, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 29% on flights from Raleigh to Illinois by exploring options for tickets in the evening.
What is the cheapest day to fly from Raleigh to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Raleigh to Illinois. Price data was last updated on April 18, 2026.
Travelers seeking maximum savings on their Raleigh to Illinois flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
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, 2026.
The most flights from RDU to USIL are scheduled on a Thursday (37 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (15 on average).
How much does it cost to fly round-trip from Raleigh 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 April 24, 2026.
Read reviews from past customers who have flown Southwest,United Airlines, andJetBlue from Raleigh to Illinois. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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.
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Alternative routes for Raleigh to Illinois
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Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
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Find flights from Raleigh to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Raleigh and Illinois flights
Browse other Raleigh and Illinois flight options. Last updated on April 24, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Raleigh to Illinois flights
Consider these flights traveling from Raleigh to Illinois.
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, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$75 | Average$194 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$98 | Average$277 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$149 | Average$339 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$160 | Average$293 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$171 | Average$408 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$177 | Average$303 | FlexibilityNo cancel fee | On-time63% |