$66+ 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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Aug 3 — Aug 101
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 4, 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 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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
Fri 9/2510:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 7/2![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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
Mon 8/104:57 pm
STL
- PHL
1 stop18h 25m
Frontier
Deal found 7/3![Frontier logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 8/68:30 am
PHL
- STL
1 stop10h 07m
Frontier
Mon 8/104:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/3![Frontier logo]()
$141
This Kiwi.com deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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 8/71:32 pm
PHL
- STL
1 stop20h 25m
Frontier
Mon 8/104:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/1![Frontier logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 7/244:40 pm
PHL
- STL
1 stop17h 17m
Frontier
Tue 7/286:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/2![Frontier logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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
Sun 8/96:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/3![Frontier logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” 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 7/284:30 pm
PHL
- STL
1 stop17h 27m
Frontier
Fri 8/74:57 pm
STL
- PHL
1 stop14h 42m
Frontier
Deal found 6/30![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 7/288:30 am
PHL
- STL
1 stop10h 07m
Frontier
Thu 7/306:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/3![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 8/68:30 am
PHL
- STL
1 stop10h 07m
Frontier
Sun 8/96:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/2![Frontier logo]()
$153
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/224:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Wed 8/124:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/2![Frontier logo]()
$154
This JetBlue deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” 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 9/1110:45 am
PHL
- ORD
1 stop9h 37m
JetBlue
Mon 9/149:38 am
ORD
- PHL
1 stop7h 26m
JetBlue
Deal found 6/30![JetBlue logo]()
$219
This Super.com deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” 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 9/46:00 am
PHL
- ORD
Nonstop2h 29m
Frontier
Mon 9/78:37 am
ORD
- PHL
Nonstop2h 15m
Frontier
Deal found 6/30![Frontier logo]()
$220
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 4, 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 4, 2026.
This JetBlue deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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 9/2410:45 am
PHL
- ORD
1 stop9h 37m
JetBlue
Sun 9/279:38 am
ORD
- PHL
1 stop7h 26m
JetBlue
Deal found 7/1![JetBlue logo]()
$248
This Southwest deal was found by Cheapflights users on 6/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/295:05 pm
PHL
- STL
Nonstop2h 35m
Southwest
Wed 8/56:40 pm
STL
- PHL
Nonstop2h 10m
Southwest
Deal found 6/29![Southwest logo]()
$249
This United Airlines deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 8/46:00 am
PHL
- ORD
Nonstop2h 30m
United Airlines
Sat 8/87:15 am
ORD
- PHL
Nonstop2h 15m
United Airlines
Deal found 7/3![United Airlines logo]()
$269
This American Airlines deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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 8/15:06 am
PHL
- CMI
1 stop7h 01m
American Airlines
Sat 8/811:41 am
CMI
- PHL
1 stop6h 38m
American Airlines
Deal found 7/1![American Airlines logo]()
$270
This Delta deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 8/275:15 am
PHL
- MLI
1 stop6h 10m
Delta
Sun 9/66:00 am
MLI
- PHL
1 stop5h 44m
Delta
Deal found 7/3![Delta logo]()
$285
This Kiwi.com deal was found by Cheapflights users on 6/29. 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 7/1710:59 pm
PHL
- RFD
2 stops36h 38m
Multiple Airlines
Thu 7/2311:27 am
RFD
- PHL
1 stop12h 12m
Multiple Airlines
Deal found 6/29![Multiple Airlines logo]()
$343
This Southwest deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” 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 8/43:00 pm
PHL
- MDW
Nonstop2h 00m
Southwest
Tue 8/113:00 pm
MDW
- PHL
Nonstop2h 00m
Southwest
Deal found 6/30![Southwest logo]()
$253
This JetBlue deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 10/210:45 am
PHL
- ORD
1 stop9h 37m
JetBlue
Mon 10/59:38 am
ORD
- PHL
1 stop7h 26m
JetBlue
Deal found 7/3![JetBlue logo]()
$277
This Southwest deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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 8/206:35 pm
PHL
- STL
Nonstop2h 25m
Southwest
Mon 8/243:45 pm
STL
- PHL
1 stop5h 15m
Southwest
Deal found 7/1![Southwest logo]()
$279
This United Airlines deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” 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
- ORD
Nonstop2h 25m
United Airlines
Fri 8/149:45 pm
ORD
- PHL
Nonstop2h 14m
United Airlines
Deal found 6/30![United Airlines logo]()
$308
This American Airlines deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/275:55 pm
PHL
- MLI
1 stop7h 13m
American Airlines
Sun 9/66:00 am
MLI
- PHL
1 stop4h 30m
American Airlines
Deal found 7/3![American Airlines logo]()
$324
This Southwest deal was found by Cheapflights users on 6/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/66:20 am
PHL
- STL
Nonstop2h 15m
Southwest
Thu 8/611:05 am
STL
- PHL
1 stop5h 50m
Southwest
Deal found 6/29![Southwest logo]()
$279
This United Airlines deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” 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 9/296:10 am
PHL
- ORD
Nonstop2h 25m
United Airlines
Fri 10/26:15 pm
ORD
- PHL
Nonstop2h 14m
United Airlines
Deal found 6/30![United Airlines logo]()
$308
This Delta deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 9/275:20 am
PHL
- ORD
1 stop5h 59m
Delta
Tue 9/296:25 pm
ORD
- PHL
1 stop5h 16m
Delta
Deal found 7/3![Delta logo]()
$352
This Kiwi.com deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/292:59 pm
PHL
- RFD
1 stop20h 38m
Multiple Airlines
Sun 8/211:27 am
RFD
- PHL
2 stops11h 19m
Multiple Airlines
Deal found 6/30![Multiple Airlines logo]()
$357
This Southwest deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 9/245:25 am
PHL
- STL
1 stop6h 45m
Southwest
Tue 9/296:40 pm
STL
- PHL
Nonstop2h 10m
Southwest
Deal found 7/3![Southwest logo]()
$279
This United Airlines deal was found by Cheapflights users on 7/4. Clicking the “Pick Dates” 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 7/317:00 pm
PHL
- MLI
1 stop5h 16m
United Airlines
Sun 8/26:30 pm
MLI
- PHL
1 stop5h 27m
United Airlines
Deal found 7/4![United Airlines logo]()
$309
This Kiwi.com deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/222:59 pm
PHL
- RFD
1 stop20h 38m
Multiple Airlines
Sun 7/2611:27 am
RFD
- PHL
2 stops11h 19m
Multiple Airlines
Deal found 6/30![Multiple Airlines logo]()
$361
This Southwest deal was found by Cheapflights users on 6/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/201:05 pm
PHL
- MDW
1 stop9h 55m
Southwest
Mon 8/245:30 am
MDW
- PHL
2 stops10h 55m
Southwest
Deal found 6/29![Southwest logo]()
$282
This Delta deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 8/183:58 pm
PHL
- EVV
1 stop7h 03m
Delta
Fri 8/286:25 am
EVV
- PHL
1 stop6h 01m
Delta
Deal found 7/3![Delta logo]()
$379
This American Airlines deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” 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 20m
American Airlines
Deal found 6/30![American Airlines logo]()
$401
This Kiwi.com deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” 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 7/219:16 pm
PHL
- RFD
1 stop12h 57m
Multiple Airlines
Thu 7/2311:27 am
RFD
- PHL
1 stop12h 12m
Multiple Airlines
Deal found 6/30![Multiple Airlines logo]()
$375
This United Airlines deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 8/128:14 am
MLI
- PHL
1 stop5h 26m
United Airlines
Deal found 7/2![United Airlines logo]()
$341
This Southwest deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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
Tue 9/222:50 pm
STL
- PHL
2 stops8h 00m
Southwest
Deal found 7/3![Southwest logo]()
$284
This Delta deal was found by Cheapflights users on 6/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/197:00 pm
PHL
- ORD
1 stop5h 53m
Delta
Tue 7/218:03 am
ORD
- PHL
1 stop5h 59m
Delta
Deal found 6/29![Delta logo]()
$387
This United Airlines deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” 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 8/176:56 pm
PHL
- ORD
Nonstop2h 30m
United Airlines
Sat 8/226:30 am
ORD
- PHL
Nonstop2h 08m
United Airlines
Deal found 6/30![United Airlines logo]()
$341
This Kiwi.com deal was found by Cheapflights users on 6/29. 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.
Mon 7/208:10 am
PHL
- RFD
1 stop11h 50m
Multiple Airlines
Thu 7/2311:27 am
RFD
- PHL
1 stop12h 12m
Multiple Airlines
Deal found 6/29![Multiple Airlines logo]()
$385
This Southwest deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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
Thu 8/207:50 pm
MDW
- PHL
1 stop12h 50m
Southwest
Deal found 7/3![Southwest logo]()
$294
This United Airlines deal was found by Cheapflights users on 6/29. 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.
Tue 10/271:22 pm
PHL
- CMI
1 stop5h 06m
United Airlines
Sat 10/316:30 am
CMI
- PHL
1 stop4h 46m
United Airlines
Deal found 6/29![United Airlines logo]()
$350
This Delta deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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.
Mon 8/176:15 am
PHL
- EVV
1 stop4h 08m
Delta
Fri 8/2810:04 am
EVV
- PHL
1 stop6h 30m
Delta
Deal found 7/3![Delta logo]()
$427
Last-minute flights from Philadelphia to IllinoisDiscover last-minute flight deals from Philadelphia to Illinois. Data last updated July 4, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Illinois. Data last updated July 4, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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 7/96:05 pm
PHL
- ORD
Nonstop2h 42m
Frontier
Mon 7/138:58 pm
ORD
- PHL
Nonstop2h 23m
Frontier
Deal found 7/1![Frontier logo]()
$230
This Super.com deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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 7/106:11 pm
PHL
- ORD
Nonstop2h 42m
Frontier
Mon 7/138:58 pm
ORD
- PHL
Nonstop2h 23m
Frontier
Deal found 7/1![Frontier logo]()
$231
This Kiwi.com deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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 7/218:30 am
PHL
- STL
1 stop10h 07m
Frontier
Fri 7/244:57 pm
STL
- PHL
1 stop14h 42m
Frontier
Deal found 7/1![Frontier logo]()
$155
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/224:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Wed 8/124:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/2![Frontier logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 7/244:40 pm
PHL
- STL
1 stop17h 17m
Frontier
Tue 7/286:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/2![Frontier logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” 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 7/284:30 pm
PHL
- STL
1 stop17h 27m
Frontier
Fri 8/74:57 pm
STL
- PHL
1 stop14h 42m
Frontier
Deal found 6/30![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 7/288:30 am
PHL
- STL
1 stop10h 07m
Frontier
Thu 7/306:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/3![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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
Mon 8/104:57 pm
STL
- PHL
1 stop18h 25m
Frontier
Deal found 7/3![Frontier logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 8/68:30 am
PHL
- STL
1 stop10h 07m
Frontier
Mon 8/104:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/3![Frontier logo]()
$141
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 8/68:30 am
PHL
- STL
1 stop10h 07m
Frontier
Sun 8/96:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/2![Frontier logo]()
$153
This Kiwi.com deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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 8/71:32 pm
PHL
- STL
1 stop20h 25m
Frontier
Mon 8/104:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 7/1![Frontier logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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
Sun 8/96:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 7/3![Frontier logo]()
$147
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 4, 2026.
Search for one-way flight options from Philadelphia to Illinois. Find affordable one-way fares based on user searches. Data last updated July 4, 2026.
This Trip.com deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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 8/46:30 am
PHL
- STL
1 stop12h 07m
Frontier
Deal found 7/1![Frontier logo]()
$66
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 8/14:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Deal found 7/2![Frontier logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 9/2712:43 pm
PHL
- STL
1 stop21h 57m
Frontier
Deal found 7/2![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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 7/288:30 am
PHL
- STL
1 stop10h 07m
Frontier
Deal found 7/1![Frontier logo]()
$74
This Kiwi.com deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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 9/2612:43 pm
PHL
- STL
1 stop21h 57m
Frontier
Deal found 7/1![Frontier logo]()
$75
This Kiwi.com deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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 9/295:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Deal found 7/1![Frontier logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 8/144:40 pm
PHL
- STL
1 stop17h 17m
Frontier
Deal found 7/2![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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 8/98:30 am
PHL
- STL
1 stop25h 27m
Frontier
Deal found 7/1![Frontier logo]()
$81
This Trip.com deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” 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.
Sun 8/28:30 am
PHL
- STL
1 stop10h 07m
Frontier
Deal found 6/30![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 7/244:40 pm
PHL
- STL
1 stop17h 17m
Frontier
Deal found 7/2![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” 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
Deal found 7/1![Frontier logo]()
$85
This Super.com deal was found by Cheapflights users on 6/29. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/36:11 pm
PHL
- ORD
Nonstop2h 42m
Frontier
Deal found 6/29![Frontier logo]()
$106
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 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $130 (Kiwi.com) |
One-way from | $66 (Trip.com) |
Popular in | June |
Cheapest in | January |
Average price | $299 |
Good round-trip deal | $322 or less |
Good one-way deal | $165 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 4, 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 9/24
10:45 am-7:22 pm
1 stop9h 37m
Chicago O'Hare Intl
Sun 9/27
9:38 am-6:04 pm
1 stop7h 26m
$248
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Wed 7/29
5:05 pm-6:40 pm
Nonstop2h 35m
Lambert-St Louis
Wed 8/5
6:40 pm-9:50 pm
Nonstop2h 10m
$249
Quickest round-trip
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Tue 8/4
3:00 pm-4:00 pm
Nonstop2h 00m
Chicago Midway
Tue 8/11
3:00 pm-6:00 pm
Nonstop2h 00m
$253
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Tue 8/4
6:00 am-7:30 am
Nonstop2h 30m
Chicago O'Hare Intl
Sat 8/8
7:15 am-10:30 am
Nonstop2h 15m
$269
PhiladelphiaChampaign
PHL - CMI
PHLCMI
Philadelphia
Sat 8/1
5:06 am-11:07 am
1 stop7h 01m
Champaign University-Willard
Sat 8/8
11:41 am-7:19 pm
1 stop6h 38m
$270
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Fri 10/2
10:45 am-7:22 pm
1 stop9h 37m
Chicago O'Hare Intl
Mon 10/5
9:38 am-6:04 pm
1 stop7h 26m
$277
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Thu 8/20
6:35 pm-8:00 pm
Nonstop2h 25m
Lambert-St Louis
Mon 8/24
3:45 pm-10:00 pm
1 stop5h 15m
$279
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Thu 8/6
6:20 am-7:35 am
Nonstop2h 15m
Lambert-St Louis
Thu 8/6
11:05 am-5:55 pm
1 stop5h 50m
$279
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Thu 9/24
5:25 am-11:10 am
1 stop6h 45m
Lambert-St Louis
Tue 9/29
6:40 pm-9:50 pm
Nonstop2h 10m
$279
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Thu 8/20
1:05 pm-10:00 pm
1 stop9h 55m
Chicago Midway
Mon 8/24
5:30 am-5:25 pm
2 stops10h 55m
$282
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-SPI
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 4, 2026.
It’s optimal to fly from Philadelphia to Illinois in the evening. By choosing this option you can save up to 19% on the cost of your flight, compared to a flight at noon.
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 4, 2026.
The most flights from PHL to USIL are scheduled on a Friday (47 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (36 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 June 27, 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 4, 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
Overall
7.9
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Overall
7.9
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Overall
7.9
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Overall
7.9
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Overall
7.9
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Entertainment
7.5
Food
7.0
Overall
7.9
Crew
8.6
Comfort
8.0
Boarding
8.1
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 4, 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 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$77 | Average$175 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$133 | Average$266 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$158 | Average$352 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$162 | Average$391 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$164 | Average$345 | FlexibilityNo cancel fee | On-time69% |