$60+ 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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Aug 14 — Aug 211
Round-trip
1 adult, Economy
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Find cheap flights from Philadelphia to Illinois with Cheapflights
1. Tell us where you want to go
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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 15, 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 15, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/66:25 am
PHL
- STL
1 stop12h 12m
Frontier
Tue 8/116:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/10![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 7/13. 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 8/64:30 pm
PHL
- STL
1 stop17h 27m
Frontier
Mon 8/104:57 pm
STL
- PHL
1 stop18h 25m
Frontier
Deal found 7/13![Frontier logo]()
$119
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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
Sun 8/236:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/10![Frontier logo]()
$121
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/45:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Thu 10/810:35 am
STL
- PHL
1 stop11h 46m
Frontier
Deal found 7/10![Frontier logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/65:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Thu 10/810:35 am
STL
- PHL
1 stop11h 46m
Frontier
Deal found 7/10![Frontier logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/74:40 pm
PHL
- STL
1 stop17h 17m
Frontier
Fri 8/144:57 pm
STL
- PHL
1 stop14h 42m
Frontier
Deal found 7/10![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 7/13. 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 8/96:25 am
PHL
- STL
1 stop27h 32m
Frontier
Thu 8/136:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/13![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/137:10 am
PHL
- STL
1 stop27h 30m
Frontier
Thu 9/1710:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 7/10![Frontier logo]()
$131
This Kiwi.com deal was found by Cheapflights users on 7/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/104:40 pm
PHL
- STL
1 stop25h 57m
Frontier
Mon 8/174:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/11![Frontier logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 7/9. 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 8/48:30 am
PHL
- STL
1 stop10h 07m
Frontier
Thu 8/66:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/9![Frontier logo]()
$137
This Super.com deal was found by Cheapflights users on 7/13. 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 9/310:22 am
PHL
- ORD
Nonstop2h 33m
Frontier
Mon 9/78:37 am
ORD
- PHL
Nonstop2h 15m
Frontier
Deal found 7/13![Frontier logo]()
$195
This Kiwi.com deal was found by Cheapflights users on 7/14. 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 8/96:25 am
PHL
- ORD
1 stop14h 28m
Frontier
Thu 8/206:00 am
ORD
- PHL
Nonstop2h 17m
Frontier
Deal found 7/14![Frontier logo]()
$196
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 15, 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 15, 2026.
This JetBlue deal was found by Cheapflights users on 7/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1010:45 am
PHL
- ORD
1 stop9h 37m
JetBlue
Sun 9/139:38 am
ORD
- PHL
1 stop7h 26m
JetBlue
Deal found 7/12![JetBlue logo]()
$219
This Southwest deal was found by Cheapflights users on 7/9. 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 9/242:05 pm
PHL
- MDW
Nonstop2h 05m
Southwest
Fri 9/253:20 pm
MDW
- PHL
1 stop5h 40m
Southwest
Deal found 7/9![Southwest logo]()
$219
This Delta deal was found by Cheapflights users on 7/9. 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 8/75:16 pm
PHL
- MDW
1 stop6h 20m
Delta
Mon 8/106:42 pm
MDW
- PHL
1 stop3h 44m
Delta
Deal found 7/9![Delta logo]()
$229
This United Airlines deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/185:01 pm
PHL
- ORD
Nonstop2h 31m
United Airlines
Wed 8/198:45 am
ORD
- PHL
1 stop4h 36m
United Airlines
Deal found 7/10![United Airlines logo]()
$268
This American Airlines deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/129:19 am
PHL
- CMI
1 stop4h 33m
American Airlines
Sat 9/191:23 pm
CMI
- PHL
1 stop6h 47m
American Airlines
Deal found 7/10![American Airlines logo]()
$270
This Kiwi.com deal was found by Cheapflights users on 7/13. 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 8/66:33 pm
PHL
- RFD
1 stop14h 16m
Multiple Airlines
Sun 8/911:37 am
RFD
- PHL
2 stops18h 38m
Multiple Airlines
Deal found 7/13![Multiple Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/215:25 pm
PHL
- MDW
1 stop6h 55m
Southwest
Tue 8/251:00 pm
MDW
- PHL
2 stops7h 45m
Southwest
Deal found 7/10![Southwest logo]()
$234
This Southwest deal was found by Cheapflights users on 7/9. 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 8/144:05 pm
PHL
- MDW
1 stop8h 40m
Southwest
Tue 8/1812:35 pm
MDW
- PHL
2 stops8h 15m
Southwest
Deal found 7/9![Southwest logo]()
$235
This Delta deal was found by Cheapflights users on 7/13. 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 8/81:49 pm
PHL
- ORD
1 stop6h 10m
Delta
Tue 8/181:59 pm
ORD
- PHL
1 stop4h 31m
Delta
Deal found 7/13![Delta logo]()
$277
This Southwest deal was found by Cheapflights users on 7/9. 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 8/158:05 am
PHL
- MDW
Nonstop2h 05m
Southwest
Sat 8/1511:45 am
MDW
- PHL
Nonstop1h 55m
Southwest
Deal found 7/9![Southwest logo]()
$236
This United Airlines deal was found by Cheapflights users on 7/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:25 am
PHL
- PAH
1 stop7h 45m
United Airlines
Tue 8/185:00 am
PAH
- PHL
1 stop6h 23m
United Airlines
Deal found 7/12![United Airlines logo]()
$294
This American Airlines deal was found by Cheapflights users on 7/9. 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 7/255:06 am
PHL
- MLI
1 stop6h 52m
American Airlines
Sat 8/811:43 am
MLI
- PHL
1 stop6h 36m
American Airlines
Deal found 7/9![American Airlines logo]()
$300
This Delta deal was found by Cheapflights users on 7/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/133:58 pm
PHL
- MLI
1 stop7h 21m
Delta
Wed 8/196:00 am
MLI
- PHL
1 stop7h 47m
Delta
Deal found 7/12![Delta logo]()
$285
This Kiwi.com deal was found by Cheapflights users on 7/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/305:28 pm
PHL
- RFD
2 stops16h 12m
Multiple Airlines
Sun 10/41:56 pm
RFD
- PHL
1 stop5h 52m
Multiple Airlines
Deal found 7/11![Multiple Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 7/9. 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 8/47:42 am
PHL
- CMI
1 stop4h 25m
American Airlines
Tue 8/114:54 pm
CMI
- PHL
1 stop6h 05m
American Airlines
Deal found 7/9![American Airlines logo]()
$306
This United Airlines deal was found by Cheapflights users on 7/14. 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 8/138:20 am
PHL
- MLI
1 stop5h 02m
United Airlines
Sun 8/165:09 pm
MLI
- PHL
1 stop6h 50m
United Airlines
Deal found 7/14![United Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 7/14. 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 8/318:00 am
PHL
- MDW
Nonstop2h 05m
Southwest
Mon 9/79:30 am
MDW
- PHL
Nonstop1h 55m
Southwest
Deal found 7/14![Southwest logo]()
$257
This Delta deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:10 am
PHL
- STL
1 stop4h 05m
Delta
Wed 10/77:20 pm
STL
- PHL
1 stop4h 36m
Delta
Deal found 7/10![Delta logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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
Sun 10/1110:30 am
RFD
- PHL
2 stops11h 12m
Multiple Airlines
Deal found 7/10![Multiple Airlines logo]()
$321
This Southwest deal was found by Cheapflights users on 7/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/32:05 pm
PHL
- MDW
Nonstop2h 05m
Southwest
Sat 9/58:05 am
MDW
- PHL
1 stop4h 25m
Southwest
Deal found 7/11![Southwest logo]()
$267
This Delta deal was found by Cheapflights users on 7/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/228:10 am
PHL
- STL
1 stop6h 13m
Delta
Thu 9/246:54 pm
STL
- PHL
1 stop4h 47m
Delta
Deal found 7/12![Delta logo]()
$297
This Kiwi.com deal was found by Cheapflights users on 7/9. 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 8/285:05 am
PHL
- RFD
1 stop11h 18m
Multiple Airlines
Mon 8/317:04 pm
RFD
- PHL
1 stop12h 47m
Multiple Airlines
Deal found 7/9![Multiple Airlines logo]()
$336
This United Airlines deal was found by Cheapflights users on 7/9. 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 8/87:00 pm
PHL
- MLI
1 stop5h 16m
United Airlines
Wed 8/125:40 am
MLI
- PHL
1 stop5h 43m
United Airlines
Deal found 7/9![United Airlines logo]()
$341
This Delta deal was found by Cheapflights users on 7/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/65:15 am
PHL
- STL
1 stop7h 31m
Delta
Mon 8/106:30 am
STL
- PHL
1 stop4h 21m
Delta
Deal found 7/12![Delta logo]()
$297
This Southwest deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:05 pm
PHL
- MDW
Nonstop2h 05m
Southwest
Tue 8/184:40 pm
MDW
- PHL
1 stop4h 10m
Southwest
Deal found 7/10![Southwest logo]()
$271
This Kiwi.com deal was found by Cheapflights users on 7/14. 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 8/68:35 am
PHL
- EVV
1 stop10h 14m
Multiple Airlines
Sun 8/98:38 pm
EVV
- PHL
2 stops33h 37m
Multiple Airlines
Deal found 7/14![Multiple Airlines logo]()
$338
This American Airlines deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1912:39 pm
PHL
- PIA
1 stop5h 19m
American Airlines
Sun 9/275:28 pm
PIA
- PHL
1 stop4h 21m
American Airlines
Deal found 7/10![American Airlines logo]()
$401
This Kiwi.com deal was found by Cheapflights users on 7/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/64:30 pm
PHL
- PIA
2 stops16h 44m
Multiple Airlines
Mon 8/109:04 am
PIA
- PHL
1 stop22h 48m
Multiple Airlines
Deal found 7/12![Multiple Airlines logo]()
$340
This United Airlines deal was found by Cheapflights users on 7/13. 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 9/18:20 am
PHL
- PAH
1 stop5h 50m
United Airlines
Sat 9/55:02 am
PAH
- PHL
1 stop6h 21m
United Airlines
Deal found 7/13![United Airlines logo]()
$374
This Southwest deal was found by Cheapflights users on 7/13. 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 9/227:15 am
PHL
- MDW
2 stops9h 10m
Southwest
Wed 9/232:00 pm
MDW
- PHL
1 stop6h 50m
Southwest
Deal found 7/13![Southwest logo]()
$282
Last-minute flights from Philadelphia to IllinoisDiscover last-minute flight deals from Philadelphia to Illinois. Data last updated July 15, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Illinois. Data last updated July 15, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/311:32 pm
PHL
- STL
1 stop20h 25m
Frontier
Sun 8/26:34 pm
STL
- PHL
1 stop16h 48m
Frontier
Deal found 7/10![Frontier logo]()
$131
This Kiwi.com deal was found by Cheapflights users on 7/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/34:40 pm
PHL
- STL
1 stop25h 57m
Frontier
Mon 8/104:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/12![Frontier logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 7/9. 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 8/48:30 am
PHL
- STL
1 stop10h 07m
Frontier
Thu 8/66:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/9![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/66:25 am
PHL
- STL
1 stop12h 12m
Frontier
Tue 8/116:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/10![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 7/13. 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 8/64:30 pm
PHL
- STL
1 stop17h 27m
Frontier
Mon 8/104:57 pm
STL
- PHL
1 stop18h 25m
Frontier
Deal found 7/13![Frontier logo]()
$119
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/74:40 pm
PHL
- STL
1 stop17h 17m
Frontier
Fri 8/144:57 pm
STL
- PHL
1 stop14h 42m
Frontier
Deal found 7/10![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 7/13. 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 8/96:25 am
PHL
- STL
1 stop27h 32m
Frontier
Thu 8/136:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/13![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 7/14. 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 8/96:25 am
PHL
- ORD
1 stop14h 28m
Frontier
Thu 8/206:00 am
ORD
- PHL
Nonstop2h 17m
Frontier
Deal found 7/14![Frontier logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 7/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/104:40 pm
PHL
- STL
1 stop25h 57m
Frontier
Mon 8/174:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/11![Frontier logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 7/14. 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 8/106:25 am
PHL
- ORD
1 stop14h 28m
Frontier
Sat 8/158:52 pm
ORD
- PHL
Nonstop2h 23m
Frontier
Deal found 7/14![Frontier logo]()
$195
This Kiwi.com deal was found by Cheapflights users on 7/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:25 am
PHL
- STL
1 stop12h 12m
Frontier
Wed 8/124:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/12![Frontier logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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
Sun 8/236:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/10![Frontier logo]()
$121
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 15, 2026.
Search for one-way flight options from Philadelphia to Illinois. Find affordable one-way fares based on user searches. Data last updated July 15, 2026.
This Trip.com deal was found by Cheapflights users on 7/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:25 am
PHL
- STL
1 stop12h 12m
Frontier
Deal found 7/11![Frontier logo]()
$60
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/255:38 pm
PHL
- STL
1 stop17h 02m
Frontier
Deal found 7/10![Frontier logo]()
$61
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/95:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Deal found 7/10![Frontier logo]()
$62
This Kiwi.com deal was found by Cheapflights users on 7/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/88:30 am
PHL
- STL
1 stop26h 10m
Frontier
Deal found 7/12![Frontier logo]()
$64
This Kiwi.com deal was found by Cheapflights users on 7/9. 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 8/54:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Deal found 7/9![Frontier logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 7/9. 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 9/54:45 pm
PHL
- STL
1 stop25h 37m
Frontier
Deal found 7/9![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 7/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/96:25 am
PHL
- STL
1 stop27h 32m
Frontier
Deal found 7/11![Frontier logo]()
$71
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/308:30 am
PHL
- STL
1 stop10h 07m
Frontier
Deal found 7/10![Frontier logo]()
$73
This Kiwi.com deal was found by Cheapflights users on 7/9. 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 9/105:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Deal found 7/9![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 7/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/96:25 am
PHL
- ORD
1 stop26h 37m
Frontier
Deal found 7/11![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 7/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/84:30 pm
PHL
- MDW
1 stop6h 33m
Frontier
Deal found 7/11![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 7/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/109:14 am
PHL
- RFD
2 stops24h 38m
Multiple Airlines
Deal found 7/12![Multiple Airlines logo]()
$105
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 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $118 (Kiwi.com) |
One-way from | $60 (Trip.com) |
Popular in | June |
Cheapest in | January |
Average price | $308 |
Good round-trip deal | $316 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 15, 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 - ORD
PHLORD
Philadelphia
Thu 9/10
10:45 am-7:22 pm
1 stop9h 37m
Chicago O'Hare Intl
Sun 9/13
9:38 am-6:04 pm
1 stop7h 26m
$219
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Thu 9/24
2:05 pm-3:10 pm
Nonstop2h 05m
Chicago Midway
Fri 9/25
3:20 pm-10:00 pm
1 stop5h 40m
$219
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Fri 8/7
5:16 pm-10:36 pm
1 stop6h 20m
Chicago Midway
Mon 8/10
6:42 pm-11:26 pm
1 stop3h 44m
$229
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Fri 8/21
5:25 pm-11:20 pm
1 stop6h 55m
Chicago Midway
Tue 8/25
1:00 pm-9:45 pm
2 stops7h 45m
$234
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Fri 8/14
4:05 pm-11:45 pm
1 stop8h 40m
Chicago Midway
Tue 8/18
12:35 pm-9:50 pm
2 stops8h 15m
$235
Quickest round-trip
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Sat 8/15
8:05 am-9:10 am
Nonstop2h 05m
Chicago Midway
Sat 8/15
11:45 am-2:40 pm
Nonstop1h 55m
$236
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Mon 8/31
8:00 am-9:05 am
Nonstop2h 05m
Chicago Midway
Mon 9/7
9:30 am-12:25 pm
Nonstop1h 55m
$257
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Thu 9/3
2:05 pm-3:10 pm
Nonstop2h 05m
Chicago Midway
Sat 9/5
8:05 am-1:30 pm
1 stop4h 25m
$267
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Tue 8/18
5:01 pm-6:32 pm
Nonstop2h 31m
Chicago O'Hare Intl
Wed 8/19
8:45 am-2:21 pm
1 stop4h 36m
$268
PhiladelphiaChampaign
PHL - CMI
PHLCMI
Philadelphia
Sat 9/12
9:19 am-12:52 pm
1 stop4h 33m
Champaign University-Willard
Sat 9/19
1:23 pm-9:10 pm
1 stop6h 47m
$270
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-MDW
PHL-RFD
PHL-CMI
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-MDW
PHL-RFD
What is the cheapest month to book a flight from Philadelphia to Illinois?
Currently, February is the cheapest month in which you can book a flight from Philadelphia to Illinois (average of $40). Flying from Philadelphia to Illinois in January is currently the most expensive (average of $782). 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 15, 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 15, 2026.
The most flights from PHL to USIL are scheduled on a Tuesday (54 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (31 on average).
How much does it cost to fly round-trip from Philadelphia to Illinois?
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 11, 2026.
Travelers seeking maximum savings on their Philadelphia to Illinois flight should consider departing on Friday evenings 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 15, 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.
Food
7.0
Entertainment
7.5
Crew
8.6
Comfort
8.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Crew
8.6
Comfort
8.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Crew
8.6
Comfort
8.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Crew
8.6
Comfort
8.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Crew
8.6
Comfort
8.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Crew
8.6
Comfort
8.0
Boarding
8.1
Overall
8.0
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 15, 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 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$77 | Average$178 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$133 | Average$266 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$158 | Average$355 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$161 | Average$391 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$166 | Average$346 | FlexibilityNo cancel fee | On-time69% |