$52+ 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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Aug 26 — Sep 21
Round-trip
1 adult, Economy
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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 27, 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 27, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Tue 9/84:45 pm
PHL
- STL
1 stop17h 55m
Frontier
Sat 9/1210:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 7/23![Frontier logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 11/312:43 pm
PHL
- STL
1 stop21h 57m
Frontier
Fri 11/610:35 am
STL
- PHL
1 stop20h 01m
Frontier
Deal found 7/22![Frontier logo]()
$107
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 11/115:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Wed 11/1810:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 7/24![Frontier logo]()
$110
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 10/45:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Wed 10/710:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 7/22![Frontier logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/136:25 am
PHL
- STL
1 stop12h 12m
Frontier
Mon 8/174:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/23![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Sun 8/308:30 am
PHL
- STL
1 stop9h 52m
Frontier
Mon 8/316:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/23![Frontier logo]()
$115
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 10/912:43 pm
PHL
- STL
1 stop21h 57m
Frontier
Sun 10/1110:35 am
STL
- PHL
1 stop11h 46m
Frontier
Deal found 7/22![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 10/85:38 pm
PHL
- STL
1 stop17h 02m
Frontier
Sun 10/1110:35 am
STL
- PHL
1 stop11h 46m
Frontier
Deal found 7/22![Frontier logo]()
$119
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/276:30 am
PHL
- STL
1 stop11h 52m
Frontier
Sun 8/306:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/23![Frontier logo]()
$120
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/208:30 am
PHL
- STL
1 stop9h 52m
Frontier
Thu 8/276:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/23![Frontier logo]()
$121
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Sun 10/185:38 pm
PHL
- STL
1 stop17h 02m
Frontier
Sun 10/2510:35 am
STL
- PHL
1 stop20h 01m
Frontier
Deal found 7/23![Frontier logo]()
$123
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 9/1912:40 pm
PHL
- ORD
1 stop6h 43m
Frontier
Thu 10/87:29 pm
ORD
- PHL
Nonstop2h 18m
Frontier
Deal found 7/27![Frontier logo]()
$185
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 27, 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 27, 2026.
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 10/15:45 pm
PHL
- RFD
1 stop15h 14m
Multiple Airlines
Sun 10/410:08 am
RFD
- PHL
1 stop12h 34m
Multiple Airlines
Deal found 7/25![Multiple Airlines logo]()
$233
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/210:42 am
PHL
- ORD
1 stop9h 19m
JetBlue
Tue 10/69:39 am
ORD
- PHL
1 stop7h 10m
JetBlue
Deal found 7/26![JetBlue logo]()
$249
This United Airlines 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 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 7/25![United Airlines logo]()
$257
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 9/123:40 pm
PHL
- MDW
Nonstop2h 05m
Southwest
Mon 9/146:45 pm
MDW
- PHL
Nonstop2h 00m
Southwest
Deal found 7/25![Southwest logo]()
$257
This American Airlines deal was found by Cheapflights users on 7/23. 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.
Tue 9/155:49 pm
PHL
- MLI
1 stop7h 16m
American Airlines
Tue 9/224:57 pm
MLI
- PHL
1 stop4h 52m
American Airlines
Deal found 7/23![American Airlines logo]()
$271
This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/297:25 am
PHL
- ORD
1 stop6h 15m
Delta
Sat 8/295:18 pm
ORD
- PHL
1 stop5h 08m
Delta
Deal found 7/23![Delta logo]()
$277
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/201:30 pm
PHL
- ORD
Nonstop2h 25m
United Airlines
Sat 8/229:45 pm
ORD
- PHL
Nonstop2h 14m
United Airlines
Deal found 7/26![United Airlines logo]()
$257
This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/156:05 am
PHL
- ORD
1 stop5h 37m
Delta
Sat 8/155:18 pm
ORD
- PHL
1 stop5h 08m
Delta
Deal found 7/23![Delta logo]()
$277
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/57:40 pm
PHL
- STL
Nonstop2h 20m
Southwest
Thu 10/87:50 pm
STL
- PHL
Nonstop2h 20m
Southwest
Deal found 7/26![Southwest logo]()
$277
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/176:15 am
PHL
- ORD
1 stop6h 33m
United Airlines
Tue 10/2011:25 am
ORD
- PHL
Nonstop2h 18m
United Airlines
Deal found 7/23![United Airlines logo]()
$267
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 Delta deal was found by Cheapflights users on 7/22. 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.
Sat 9/266:15 am
PHL
- MDW
1 stop3h 52m
Delta
Sat 10/176:45 pm
MDW
- PHL
1 stop3h 27m
Delta
Deal found 7/22![Delta logo]()
$277
This Southwest deal was found by Cheapflights users on 7/23. 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 8/182:45 pm
PHL
- MDW
2 stops8h 35m
Southwest
Wed 8/194:40 pm
MDW
- PHL
1 stop4h 10m
Southwest
Deal found 7/23![Southwest logo]()
$282
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/156:56 pm
PHL
- ORD
Nonstop2h 30m
United Airlines
Sat 8/298:45 am
ORD
- PHL
1 stop4h 36m
United Airlines
Deal found 7/23![United Airlines logo]()
$267
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 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 7/24. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/85:43 am
PHL
- CMI
1 stop6h 28m
American Airlines
Wed 8/124:54 pm
CMI
- PHL
1 stop4h 29m
American Airlines
Deal found 7/24![American Airlines logo]()
$352
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 8/295:01 pm
PHL
- ORD
Nonstop2h 30m
United Airlines
Sun 8/306:29 am
ORD
- PHL
Nonstop2h 08m
United Airlines
Deal found 7/24![United Airlines logo]()
$274
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 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 Delta deal was found by Cheapflights users on 7/22. 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.
Sun 8/166:15 am
PHL
- ORD
1 stop4h 58m
Delta
Sat 8/225:18 pm
ORD
- PHL
1 stop5h 08m
Delta
Deal found 7/22![Delta logo]()
$289
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/25:43 am
PHL
- CMI
1 stop6h 28m
American Airlines
Sun 9/64:52 pm
CMI
- PHL
1 stop6h 07m
American Airlines
Deal found 7/24![American Airlines logo]()
$355
This United Airlines deal was found by Cheapflights users on 7/23. 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.
Fri 8/285:01 pm
PHL
- ORD
Nonstop2h 30m
United Airlines
Tue 9/111:22 am
ORD
- PHL
Nonstop2h 18m
United Airlines
Deal found 7/23![United Airlines logo]()
$274
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 7/27. 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 8/205:55 am
PHL
- MDW
2 stops7h 20m
Southwest
Tue 8/251:00 pm
MDW
- PHL
2 stops7h 45m
Southwest
Deal found 7/27![Southwest logo]()
$287
This Delta deal was found by Cheapflights users on 7/22. 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.
Sat 8/229:35 am
PHL
- MDW
1 stop4h 04m
Delta
Sun 8/236:42 pm
MDW
- PHL
1 stop3h 44m
Delta
Deal found 7/22![Delta logo]()
$289
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:20 am
PHL
- STL
Nonstop2h 15m
Southwest
Mon 9/216:05 am
STL
- PHL
1 stop4h 05m
Southwest
Deal found 7/26![Southwest logo]()
$287
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
Mon 10/126:13 pm
RFD
- PHL
1 stop17h 19m
Multiple Airlines
Deal found 7/26![Multiple Airlines logo]()
$365
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.
Tue 8/252:45 pm
PHL
- STL
Nonstop2h 20m
Southwest
Tue 9/112:50 pm
STL
- PHL
1 stop7h 05m
Southwest
Deal found 7/25![Southwest logo]()
$287
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
Last-minute flights from Philadelphia to IllinoisDiscover last-minute flight deals from Philadelphia to Illinois. Data last updated July 27, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Illinois. Data last updated July 27, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 7/22. 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.
Mon 8/104:40 pm
PHL
- STL
1 stop25h 57m
Frontier
Sun 8/166:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/22![Frontier logo]()
$155
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Tue 8/118:30 am
PHL
- STL
1 stop10h 07m
Frontier
Wed 8/124:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/23![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/136:25 am
PHL
- STL
1 stop12h 12m
Frontier
Mon 8/174:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/23![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/136:25 am
PHL
- STL
1 stop12h 12m
Frontier
Sat 8/154:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/22![Frontier logo]()
$164
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 Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/208:30 am
PHL
- STL
1 stop9h 52m
Frontier
Thu 8/276:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/23![Frontier logo]()
$121
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 7/22. 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 8/218:30 am
PHL
- STL
1 stop9h 52m
Frontier
Fri 8/286:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/22![Frontier logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/218:30 am
PHL
- STL
1 stop9h 52m
Frontier
Sun 8/236:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/23![Frontier logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/276:30 am
PHL
- STL
1 stop11h 52m
Frontier
Sun 8/306:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/23![Frontier logo]()
$120
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 7/23. 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.
Sun 8/308:30 am
PHL
- STL
1 stop9h 52m
Frontier
Mon 8/316:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 7/23![Frontier logo]()
$115
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 27, 2026.
Search for one-way flight options from Philadelphia to Illinois. Find affordable one-way fares based on user searches. Data last updated July 27, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Tue 9/225:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Deal found 7/23![Frontier logo]()
$52
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Wed 8/194:45 pm
PHL
- STL
1 stop25h 37m
Frontier
Deal found 7/23![Frontier logo]()
$57
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/141:32 pm
PHL
- STL
1 stop20h 25m
Frontier
Deal found 7/23![Frontier logo]()
$58
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 9/197:10 am
PHL
- STL
1 stop27h 30m
Frontier
Deal found 7/23![Frontier logo]()
$59
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Sun 8/236:30 am
PHL
- STL
1 stop11h 52m
Frontier
Deal found 7/23![Frontier logo]()
$62
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Sun 10/255:38 pm
PHL
- STL
1 stop17h 02m
Frontier
Deal found 7/23![Frontier logo]()
$63
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Mon 9/217:10 am
PHL
- STL
1 stop7h 00m
Frontier
Deal found 7/23![Frontier logo]()
$64
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 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 10/2412:43 pm
PHL
- STL
1 stop21h 57m
Frontier
Deal found 7/26![Frontier logo]()
$82
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 10/235:38 pm
PHL
- STL
1 stop17h 02m
Frontier
Deal found 7/24![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 10/212:43 pm
PHL
- ORD
1 stop24h 19m
Frontier
Deal found 7/23![Frontier logo]()
$100
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 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $99 (Kiwi.com) |
One-way from | $52 (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 27, 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
$233
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Fri 10/2
10:42 am-7:01 pm
1 stop9h 19m
Chicago O'Hare Intl
Tue 10/6
9:39 am-5:49 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
Sat 9/12
3:40 pm-4:45 pm
Nonstop2h 05m
Chicago Midway
Mon 9/14
6:45 pm-9:45 pm
Nonstop2h 00m
$257
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Thu 8/20
1:30 pm-2:55 pm
Nonstop2h 25m
Chicago O'Hare Intl
Sat 8/22
9:45 pm-12:59 am
Nonstop2h 14m
$257
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Sat 10/17
6:15 am-11:48 am
1 stop6h 33m
Chicago O'Hare Intl
Tue 10/20
11:25 am-2:43 pm
Nonstop2h 18m
$267
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Sat 8/15
6:56 pm-8:26 pm
Nonstop2h 30m
Chicago O'Hare Intl
Sat 8/29
8:45 am-2:21 pm
1 stop4h 36m
$267
PhiladelphiaMoline
PHL - MLI
PHLMLI
Philadelphia
Tue 9/15
5:49 pm-12:05 am
1 stop7h 16m
Moline Quad-City
Tue 9/22
4:57 pm-10:49 pm
1 stop4h 52m
$271
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Sat 8/29
5:01 pm-6:31 pm
Nonstop2h 30m
Chicago O'Hare Intl
Sun 8/30
6:29 am-9:37 am
Nonstop2h 08m
$274
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Fri 8/28
5:01 pm-6:31 pm
Nonstop2h 30m
Chicago O'Hare Intl
Tue 9/1
11:22 am-2:40 pm
Nonstop2h 18m
$274
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, 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 27, 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 27, 2026.
The most flights from PHL to USIL are scheduled on a Friday (56 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (44 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 August.The cheapest round-trip price found within the last 5 days was $186 on Frontier (Aug 14-Aug 17).
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 27, 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.
Entertainment
7.5
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Comfort
8.0
Overall
8.0
Boarding
8.1
Crew
8.6
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 27, 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 27, 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% |