$57+ Cheap flights from Philadelphia (PHL) 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 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Aug 28 — Sep 41
Round-trip
1 adult, Economy
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Find cheap flights from Philadelphia to Illinois with Cheapflights
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Cheapest flights from Philadelphia to IllinoisExplore the most affordable flight options available from Philadelphia to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2026.
Explore the most affordable flight options available from Philadelphia to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/28. 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.
Mon 8/318:30 am
PHL
- STL
1 stop9h 52m
Frontier
Mon 9/76:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/28![Frontier logo]()
$131
This Kiwi.com deal was found by Cheapflights users on 7/24. 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.
Wed 10/79:14 am
PHL
- STL
1 stop25h 26m
Frontier
Sat 10/1010:35 am
STL
- PHL
1 stop11h 46m
Frontier
Deal found 7/24![Frontier logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 7/28. 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 11/35:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Fri 11/610:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 7/28![Frontier logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 7/28. 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 9/38:30 am
PHL
- STL
1 stop9h 52m
Frontier
Mon 9/76:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/28![Frontier logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 7/28. 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 8/278:30 am
PHL
- STL
1 stop9h 52m
Frontier
Sun 8/306:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/28![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/304:45 pm
PHL
- STL
1 stop25h 37m
Frontier
Mon 9/282:29 pm
STL
- PHL
1 stop15h 47m
Frontier
Deal found 7/29![Frontier logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 7/28. 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 10/175:38 pm
PHL
- STL
1 stop17h 02m
Frontier
Mon 10/1910:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 7/28![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/292:45 pm
PHL
- STL
1 stop27h 37m
Frontier
Mon 8/316:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/27![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:30 am
PHL
- STL
1 stop11h 52m
Frontier
Mon 8/246:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/27![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/218:41 am
PHL
- STL
1 stop5h 29m
Frontier
Mon 9/282:29 pm
STL
- PHL
1 stop15h 47m
Frontier
Deal found 7/26![Frontier logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/225:32 pm
PHL
- STL
1 stop17h 08m
Frontier
Mon 9/282:29 pm
STL
- PHL
1 stop15h 47m
Frontier
Deal found 7/26![Frontier logo]()
$165
This Frontier deal was found by Cheapflights users on 7/28. 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 9/107:15 am
PHL
- ORD
1 stop16h 44m
Frontier
Sun 9/137:25 am
ORD
- PHL
Nonstop2h 24m
Frontier
Deal found 7/28![Frontier logo]()
$181
Best flights from Philadelphia to IllinoisDiscover carefully curated flight deals from Philadelphia to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2026.
Discover carefully curated flight deals from Philadelphia to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/15:45 pm
PHL
- RFD
1 stop15h 14m
Multiple Airlines
Sun 10/410:08 am
RFD
- PHL
1 stop12h 34m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$230
This JetBlue deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2210:42 am
PHL
- ORD
1 stop9h 19m
JetBlue
Thu 9/249:38 am
ORD
- PHL
1 stop7h 10m
JetBlue
Deal found 7/27![JetBlue logo]()
$249
This United Airlines deal was found by Cheapflights users on 7/28. 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 8/291:30 pm
PHL
- ORD
Nonstop2h 25m
United Airlines
Mon 8/319:05 am
ORD
- PHL
Nonstop2h 18m
United Airlines
Deal found 7/28![United Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/312:45 pm
PHL
- MDW
Nonstop2h 00m
Southwest
Sun 9/61:35 pm
MDW
- PHL
Nonstop1h 55m
Southwest
Deal found 7/27![Southwest logo]()
$262
This Delta deal was found by Cheapflights users on 7/24. 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 8/156:05 am
PHL
- MDW
1 stop4h 12m
Delta
Mon 8/176:42 pm
MDW
- PHL
1 stop3h 44m
Delta
Deal found 7/24![Delta logo]()
$287
This American Airlines deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/197:39 pm
PHL
- PIA
1 stop5h 29m
American Airlines
Sun 9/275:28 pm
PIA
- PHL
1 stop4h 21m
American Airlines
Deal found 7/29![American Airlines logo]()
$319
This Sun Country Air deal was found by Cheapflights users on 7/24. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2510:36 am
PHL
- ORD
1 stop22h 44m
Sun Country Air
Sun 11/297:35 pm
ORD
- PHL
1 stop15h 26m
Sun Country Air
Deal found 7/24![Sun Country Air logo]()
$435
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/96:00 am
PHL
- RFD
1 stop14h 12m
Multiple Airlines
Mon 10/126:13 pm
RFD
- PHL
1 stop17h 19m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$262
This Southwest deal was found by Cheapflights users on 7/28. 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 10/13:20 pm
PHL
- MDW
Nonstop2h 05m
Southwest
Sun 10/48:15 pm
MDW
- PHL
Nonstop1h 55m
Southwest
Deal found 7/28![Southwest logo]()
$274
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/276:15 am
PHL
- ORD
1 stop5h 22m
Delta
Tue 9/2911:17 am
ORD
- PHL
1 stop4h 15m
Delta
Deal found 7/27![Delta logo]()
$294
This Southwest deal was found by Cheapflights users on 7/28. 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.
Fri 8/288:00 am
PHL
- MDW
Nonstop2h 05m
Southwest
Mon 8/316:45 pm
MDW
- PHL
Nonstop1h 55m
Southwest
Deal found 7/28![Southwest logo]()
$274
This Kiwi.com deal was found by Cheapflights users on 7/28. 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 9/105:45 pm
PHL
- RFD
1 stop16h 07m
Multiple Airlines
Sun 9/133:53 pm
RFD
- PHL
1 stop8h 14m
Multiple Airlines
Deal found 7/28![Multiple Airlines logo]()
$280
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2010:34 am
PHL
- PIA
1 stop5h 23m
United Airlines
Fri 8/288:29 am
PIA
- PHL
1 stop5h 11m
United Airlines
Deal found 7/27![United Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/305:38 pm
PHL
- BMI
1 stop7h 21m
American Airlines
Mon 11/22:32 pm
BMI
- PHL
1 stop7h 15m
American Airlines
Deal found 7/26![American Airlines logo]()
$319
This Southwest deal was found by Cheapflights users on 7/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/208:50 pm
PHL
- MDW
Nonstop2h 10m
Southwest
Wed 9/2311:25 am
MDW
- PHL
Nonstop1h 55m
Southwest
Deal found 7/24![Southwest logo]()
$274
This Delta deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/295:25 pm
PHL
- ORD
1 stop4h 05m
Delta
Sun 8/306:59 am
ORD
- PHL
1 stop3h 52m
Delta
Deal found 7/26![Delta logo]()
$318
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/198:20 am
PHL
- ORD
Nonstop2h 25m
United Airlines
Thu 8/209:45 pm
ORD
- PHL
Nonstop2h 14m
United Airlines
Deal found 7/28![United Airlines logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/87:20 pm
PHL
- RFD
2 stops13h 42m
Multiple Airlines
Sun 10/1110:30 am
RFD
- PHL
1 stop12h 13m
Multiple Airlines
Deal found 7/26![Multiple Airlines logo]()
$301
This Southwest deal was found by Cheapflights users on 7/28. 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 8/206:20 am
PHL
- STL
Nonstop2h 15m
Southwest
Mon 8/247:05 pm
STL
- PHL
Nonstop2h 10m
Southwest
Deal found 7/28![Southwest logo]()
$277
This Southwest deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/511:55 am
PHL
- STL
Nonstop2h 20m
Southwest
Tue 9/86:40 pm
STL
- PHL
Nonstop2h 15m
Southwest
Deal found 7/25![Southwest logo]()
$277
This United Airlines deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:56 pm
PHL
- PIA
1 stop5h 17m
United Airlines
Sat 9/266:15 am
PIA
- PHL
1 stop7h 28m
United Airlines
Deal found 7/29![United Airlines logo]()
$339
This KAYAK deal was found by Cheapflights users on 7/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/196:05 am
PHL
- ORD
1 stop5h 37m
Delta
Thu 8/208:05 am
ORD
- PHL
1 stop5h 42m
Delta
Deal found 7/28![Delta logo]()
$339
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/245:45 pm
PHL
- RFD
1 stop16h 07m
Multiple Airlines
Sun 9/273:53 pm
RFD
- PHL
1 stop8h 14m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:00 am
PHL
- EVV
1 stop4h 20m
Delta
Sat 10/103:38 pm
EVV
- PHL
1 stop5h 02m
Delta
Deal found 7/27![Delta logo]()
$341
This United Airlines deal was found by Cheapflights users on 7/28. 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 1/710:10 am
PHL
- ORD
Nonstop2h 21m
United Airlines
Sun 1/109:06 am
ORD
- PHL
Nonstop2h 19m
United Airlines
Deal found 7/28![United Airlines logo]()
$341
This Southwest deal was found by Cheapflights users on 7/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/12:45 pm
PHL
- MDW
2 stops8h 35m
Southwest
Mon 9/79:30 am
MDW
- PHL
Nonstop1h 55m
Southwest
Deal found 7/24![Southwest logo]()
$283
This American Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/115:55 pm
PHL
- PIA
1 stop7h 04m
American Airlines
Sat 8/156:00 am
PIA
- PHL
2 stops8h 05m
American Airlines
Deal found 7/27![American Airlines logo]()
$428
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/225:57 pm
PHL
- RFD
1 stop14h 57m
Multiple Airlines
Sun 10/251:12 pm
RFD
- PHL
1 stop6h 36m
Multiple Airlines
Deal found 7/25![Multiple Airlines logo]()
$342
This Southwest deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/128:55 am
PHL
- MDW
1 stop6h 15m
Southwest
Sun 9/138:20 pm
MDW
- PHL
Nonstop2h 00m
Southwest
Deal found 7/25![Southwest logo]()
$284
This United Airlines deal was found by Cheapflights users on 7/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1510:30 am
PHL
- ORD
1 stop4h 57m
United Airlines
Tue 8/182:30 pm
ORD
- PHL
Nonstop2h 24m
United Airlines
Deal found 7/24![United Airlines logo]()
$347
Last-minute flights from Philadelphia to IllinoisDiscover last-minute flight deals from Philadelphia to Illinois. Data last updated July 29, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Illinois. Data last updated July 29, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/146:11 pm
PHL
- ORD
Nonstop2h 42m
Frontier
Mon 8/178:58 pm
ORD
- PHL
Nonstop2h 23m
Frontier
Deal found 7/25![Frontier logo]()
$186
This Frontier deal was found by Cheapflights users on 7/28. 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 8/188:15 am
PHL
- ORD
1 stop8h 45m
Frontier
Thu 8/206:00 am
ORD
- PHL
Nonstop2h 17m
Frontier
Deal found 7/28![Frontier logo]()
$184
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:30 am
PHL
- STL
1 stop11h 52m
Frontier
Mon 8/246:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/27![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:30 am
PHL
- STL
1 stop11h 52m
Frontier
Sun 8/236:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/25![Frontier logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 7/24. 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.
Fri 8/216:30 am
PHL
- STL
1 stop11h 52m
Frontier
Fri 8/286:17 pm
STL
- PHL
1 stop25h 11m
Frontier
Deal found 7/24![Frontier logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 7/28. 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 8/278:30 am
PHL
- STL
1 stop9h 52m
Frontier
Sun 8/306:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/28![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/288:30 am
PHL
- STL
1 stop9h 52m
Frontier
Mon 8/316:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/26![Frontier logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/288:30 am
PHL
- STL
1 stop9h 52m
Frontier
Sun 8/306:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/26![Frontier logo]()
$174
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/292:45 pm
PHL
- STL
1 stop27h 37m
Frontier
Mon 8/316:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/27![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/304:45 pm
PHL
- STL
1 stop25h 37m
Frontier
Mon 9/282:29 pm
STL
- PHL
1 stop15h 47m
Frontier
Deal found 7/29![Frontier logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 7/28. 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 8/304:45 pm
PHL
- STL
1 stop25h 37m
Frontier
Sun 9/66:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/28![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 7/28. 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.
Mon 8/318:30 am
PHL
- STL
1 stop9h 52m
Frontier
Mon 9/76:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/28![Frontier logo]()
$131
One-way flights from Philadelphia to IllinoisSearch for one-way flight options from Philadelphia to Illinois. Find affordable one-way fares based on user searches. Data last updated July 29, 2026.
Search for one-way flight options from Philadelphia to Illinois. Find affordable one-way fares based on user searches. Data last updated July 29, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/24. 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.
Tue 10/2712:43 pm
PHL
- STL
1 stop21h 57m
Frontier
Deal found 7/24![Frontier logo]()
$57
This Kiwi.com deal was found by Cheapflights users on 7/24. 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.
Sat 10/2412:43 pm
PHL
- STL
1 stop21h 57m
Frontier
Deal found 7/24![Frontier logo]()
$64
This Kiwi.com deal was found by Cheapflights users on 7/28. 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.
Mon 8/318:30 am
PHL
- STL
1 stop9h 52m
Frontier
Deal found 7/28![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/264:45 pm
PHL
- STL
1 stop25h 37m
Frontier
Deal found 7/26![Frontier logo]()
$75
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/294:45 pm
PHL
- STL
1 stop25h 37m
Frontier
Deal found 7/26![Frontier logo]()
$81
This Trip.com deal was found by Cheapflights users on 7/28. 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 8/206:30 am
PHL
- STL
1 stop11h 52m
Frontier
Deal found 7/28![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 7/28. 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 8/278:30 am
PHL
- STL
1 stop9h 52m
Frontier
Deal found 7/28![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:30 am
PHL
- STL
1 stop9h 52m
Frontier
Deal found 7/26![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/275:32 pm
PHL
- STL
1 stop20h 38m
Frontier
Deal found 7/25![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 7/24. 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.
Sat 8/224:45 pm
PHL
- STL
1 stop25h 37m
Frontier
Deal found 7/24![Frontier logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/26:42 pm
PHL
- MLI
1 stop22h 14m
Allegiant Air
Deal found 7/27![Allegiant Air logo]()
$97
This Super.com deal was found by Cheapflights users on 7/28. 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.
Fri 8/216:00 am
PHL
- ORD
Nonstop2h 29m
Frontier
Deal found 7/28![Frontier logo]()
$101
Find flight deals from Philadelphia to Illinois
Keep the following information in mind while searching for Philadelphia to Illinois flight deals. Data was last updated July 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $131 (Kiwi.com) |
One-way from | $57 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $327 |
Good round-trip deal | $289 or less |
Good one-way deal | $150 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Philadelphia to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2026.
Use the filters below to find and compare flights from Philadelphia to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
PhiladelphiaChicago
PHL - RFD
PHLRFD
Philadelphia
Thu 10/1
5:45 pm-7:59 am
1 stop15h 14m
Chicago Greater Rockford
Sun 10/4
10:08 am-11:42 pm
1 stop12h 34m
$230
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Tue 9/22
10:42 am-7:01 pm
1 stop9h 19m
Chicago O'Hare Intl
Thu 9/24
9:38 am-5:48 pm
1 stop7h 10m
$249
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Sat 8/29
1:30 pm-2:55 pm
Nonstop2h 25m
Chicago O'Hare Intl
Mon 8/31
9:05 am-12:23 pm
Nonstop2h 18m
$257
Quickest round-trip
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Thu 9/3
12:45 pm-1:45 pm
Nonstop2h 00m
Chicago Midway
Sun 9/6
1:35 pm-4:30 pm
Nonstop1h 55m
$262
PhiladelphiaChicago
PHL - RFD
PHLRFD
Philadelphia
Fri 10/9
6:00 am-7:12 pm
1 stop14h 12m
Chicago Greater Rockford
Mon 10/12
6:13 pm-12:32 pm
1 stop17h 19m
$262
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Thu 10/1
3:20 pm-4:25 pm
Nonstop2h 05m
Chicago Midway
Sun 10/4
8:15 pm-11:10 pm
Nonstop1h 55m
$274
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Fri 8/28
8:00 am-9:05 am
Nonstop2h 05m
Chicago Midway
Mon 8/31
6:45 pm-9:40 pm
Nonstop1h 55m
$274
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Sun 9/20
8:50 pm-10:00 pm
Nonstop2h 10m
Chicago Midway
Wed 9/23
11:25 am-2:20 pm
Nonstop1h 55m
$274
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Thu 8/20
6:20 am-7:35 am
Nonstop2h 15m
Lambert-St Louis
Mon 8/24
7:05 pm-10:15 pm
Nonstop2h 10m
$277
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Sat 9/5
11:55 am-1:15 pm
Nonstop2h 20m
Lambert-St Louis
Tue 9/8
6:40 pm-9:55 pm
Nonstop2h 15m
$277
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Philadelphia to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Philadelphia with our price prediction graph.
PHL-STL
PHL-ORD
PHL-RFD
PHL-MDW
PHL-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 Philadelphia to Illinois
PHL-USIL
PHL-STL
PHL-ORD
PHL-RFD
PHL-MDW
What is the cheapest month to book a flight from Philadelphia to Illinois?
Currently, November is the cheapest month in which you can book a flight from Philadelphia to Illinois (average of $233). Flying from Philadelphia to Illinois in June is currently the most expensive (average of $365). 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 PHL to IL?
Find hourly flight availability from Philadelphia to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2026.
It’s optimal to fly from Philadelphia to Illinois in the afternoon. By choosing this option you can save up to 14% on the cost of your flight, compared to a flight in the morning.
Weekly flight availability from Philadelphia to Illinois
Explore weekly flight availability from Philadelphia to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 29, 2026.
The most flights from PHL to USIL are scheduled on a Tuesday (53 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (29 on average).
How much does it cost to fly round-trip from Philadelphia to Illinois?
Airfare is below average for this route at the moment.
Philadelphia to Illinois flights typically cost between $195 and $362 in September.The cheapest round-trip price found within the last 5 days was $181 on Frontier (Sep 10-Sep 13).
How far ahead should I book a flight from Philadelphia to Illinois?
Booking 64 days in advance of your planned departure date is, on average, the best time to get cheap flights from Philadelphia to Illinois. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest day to fly from Philadelphia to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Philadelphia to Illinois. Price data was last updated on July 25, 2026.
Travelers seeking maximum savings on their Philadelphia to Illinois flight should consider departing on Friday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated July 29, 2026.
See what other customers who have flown with Southwest,Delta, andUnited Airlines from Philadelphia to Illinois have to say. 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.
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
Food
7.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from Philadelphia 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 Philadelphia 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.
Search flights from Philadelphia to Illinois by cabin class
Find flights from Philadelphia to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Philadelphia and Illinois flights
Browse other Philadelphia and Illinois flight options. Last updated on July 29, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Philadelphia to Illinois flights
Consider these flights traveling from Philadelphia to Illinois.
Top 5 airlines flying from Philadelphia to Illinois
Discover the top 5 airlines that operate flights from Philadelphia to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$75 | Average$180 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$133 | Average$266 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$168 | Average$392 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$169 | Average$364 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$171 | Average$346 | FlexibilityNo cancel fee | On-time69% |