$82+ 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 7/28. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Jul 22 — Jul 291
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 June 22, 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 June 22, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” 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 7/154:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Mon 7/204:57 pm
STL
- PHL
1 stop18h 25m
Frontier
Deal found 6/18![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” 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 7/98:30 am
PHL
- STL
1 stop10h 07m
Frontier
Mon 7/134:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 6/18![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 9/245:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Sat 10/310:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 6/17![Frontier logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 7/266:30 am
PHL
- STL
1 stop27h 27m
Frontier
Tue 8/46:34 pm
STL
- PHL
1 stop16h 48m
Frontier
Deal found 6/17![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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
Sat 10/1010:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 6/17![Frontier logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 7/154:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Wed 7/224:57 pm
STL
- PHL
1 stop18h 25m
Frontier
Deal found 6/17![Frontier logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 7/104:40 pm
PHL
- STL
1 stop17h 17m
Frontier
Sun 7/126:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/17![Frontier logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 7/96:30 am
PHL
- STL
1 stop12h 07m
Frontier
Sun 7/126:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/17![Frontier logo]()
$188
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 7/98:30 am
PHL
- STL
1 stop10h 07m
Frontier
Sat 7/114:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 6/17![Frontier logo]()
$190
This Kiwi.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” 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 7/184:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Sat 7/254:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 6/18![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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
Tue 8/46:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/17![Frontier logo]()
$194
This Trip.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/308:30 am
PHL
- STL
1 stop10h 07m
Frontier
Wed 8/54:09 pm
STL
- PHL
1 stop6h 35m
Frontier
Deal found 6/18![Frontier logo]()
$200
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 June 22, 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 June 22, 2026.
This United Airlines deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/101:24 pm
PHL
- ORD
Nonstop2h 26m
United Airlines
Tue 10/139:07 am
ORD
- PHL
Nonstop2h 18m
United Airlines
Deal found 6/19![United Airlines logo]()
$253
This Southwest deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/144:35 pm
PHL
- MDW
Nonstop2h 25m
Southwest
Wed 7/223:40 pm
MDW
- PHL
Nonstop2h 00m
Southwest
Deal found 6/21![Southwest logo]()
$253
This Delta deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1212:10 pm
PHL
- MLI
1 stop5h 15m
Delta
Sat 8/155:09 pm
MLI
- PHL
1 stop7h 10m
Delta
Deal found 6/20![Delta logo]()
$261
This American Airlines deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/27:30 am
PHL
- CMI
1 stop4h 41m
American Airlines
Sat 9/511:41 am
CMI
- PHL
1 stop6h 01m
American Airlines
Deal found 6/19![American Airlines logo]()
$270
This Kiwi.com deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/410:59 pm
PHL
- RFD
2 stops36h 48m
Multiple Airlines
Thu 8/1311:37 am
RFD
- PHL
1 stop12h 11m
Multiple Airlines
Deal found 6/19![Multiple Airlines logo]()
$289
This Delta deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/265:16 pm
PHL
- MLI
1 stop6h 03m
Delta
Sat 8/2911:08 am
MLI
- PHL
1 stop5h 31m
Delta
Deal found 6/20![Delta logo]()
$261
This Southwest deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/112:20 pm
PHL
- MDW
Nonstop2h 05m
Southwest
Wed 10/77:55 am
MDW
- PHL
Nonstop2h 05m
Southwest
Deal found 6/20![Southwest logo]()
$269
This Southwest deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/145:05 pm
PHL
- MDW
1 stop6h 35m
Southwest
Tue 7/2111:25 am
MDW
- PHL
2 stops10h 30m
Southwest
Deal found 6/21![Southwest logo]()
$278
This United Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/206:00 am
PHL
- MLI
1 stop5h 04m
United Airlines
Mon 7/276:30 pm
MLI
- PHL
1 stop5h 27m
United Airlines
Deal found 6/20![United Airlines logo]()
$309
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 7/82:59 pm
PHL
- RFD
1 stop20h 38m
Multiple Airlines
Sun 7/1211:27 am
RFD
- PHL
2 stops11h 19m
Multiple Airlines
Deal found 6/17![Multiple Airlines logo]()
$309
This Delta deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/256:00 am
PHL
- MLI
1 stop5h 12m
Delta
Mon 8/105:09 pm
MLI
- PHL
1 stop7h 10m
Delta
Deal found 6/19![Delta logo]()
$285
This Southwest deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/222:10 pm
PHL
- MDW
1 stop7h 35m
Southwest
Mon 8/248:00 am
MDW
- PHL
Nonstop2h 10m
Southwest
Deal found 6/20![Southwest logo]()
$279
This Kiwi.com deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/96:00 am
PHL
- RFD
1 stop14h 12m
Multiple Airlines
Mon 10/1210:39 am
RFD
- PHL
1 stop12h 41m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$309
This Delta deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1511:29 am
PHL
- ORD
1 stop6h 22m
Delta
Mon 8/176:40 am
ORD
- PHL
1 stop7h 07m
Delta
Deal found 6/21![Delta logo]()
$289
This United Airlines deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 7/148:05 am
PHL
- ORD
Nonstop2h 29m
United Airlines
Fri 7/175:59 pm
ORD
- PHL
Nonstop2h 20m
United Airlines
Deal found 6/17![United Airlines logo]()
$320
This Southwest deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/16:05 pm
PHL
- MDW
Nonstop2h 10m
Southwest
Tue 8/42:00 pm
MDW
- PHL
1 stop6h 50m
Southwest
Deal found 6/19![Southwest logo]()
$279
This Kiwi.com deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
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 6/20![Multiple Airlines logo]()
$321
This United Airlines deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” 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 7/38:05 am
PHL
- PIA
1 stop6h 52m
United Airlines
Wed 7/225:43 pm
PIA
- PHL
1 stop6h 14m
United Airlines
Deal found 6/18![United Airlines logo]()
$324
This American Airlines deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/22:00 pm
PHL
- BMI
1 stop4h 34m
American Airlines
Sat 7/46:00 pm
BMI
- PHL
1 stop5h 46m
American Airlines
Deal found 6/21![American Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/256:10 am
PHL
- ORD
1 stop5h 22m
Delta
Sat 7/255:18 pm
ORD
- PHL
1 stop4h 58m
Delta
Deal found 6/20![Delta logo]()
$306
This Southwest deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/104:00 pm
PHL
- MDW
1 stop6h 15m
Southwest
Tue 10/136:10 pm
MDW
- PHL
Nonstop1h 55m
Southwest
Deal found 6/19![Southwest logo]()
$279
This United Airlines deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” 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 7/36:00 am
PHL
- PIA
1 stop5h 09m
United Airlines
Thu 7/235:43 pm
PIA
- PHL
1 stop6h 14m
United Airlines
Deal found 6/18![United Airlines logo]()
$324
This Kiwi.com deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/186:00 am
PHL
- RFD
1 stop11h 15m
Multiple Airlines
Mon 9/215:20 pm
RFD
- PHL
2 stops18h 52m
Multiple Airlines
Deal found 6/21![Multiple Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/184:30 pm
PHL
- MDW
1 stop8h 15m
Southwest
Sat 7/255:55 pm
MDW
- PHL
Nonstop2h 05m
Southwest
Deal found 6/20![Southwest logo]()
$280
This Delta deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/265:15 am
PHL
- MLI
1 stop5h 57m
Delta
Fri 8/75:09 pm
MLI
- PHL
1 stop7h 10m
Delta
Deal found 6/19![Delta logo]()
$309
This United Airlines deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/108:05 am
PHL
- PIA
1 stop5h 33m
United Airlines
Mon 7/135:43 pm
PIA
- PHL
1 stop6h 14m
United Airlines
Deal found 6/21![United Airlines logo]()
$324
This American Airlines deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/35:07 am
PHL
- PIA
1 stop5h 10m
American Airlines
Fri 7/246:58 pm
PIA
- PHL
1 stop5h 01m
American Airlines
Deal found 6/18![American Airlines logo]()
$443
This Kiwi.com deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/152:59 pm
PHL
- RFD
1 stop20h 38m
Multiple Airlines
Sun 7/1911:27 am
RFD
- PHL
2 stops11h 19m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$333
This Delta deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 7/174:08 pm
PHL
- MLI
1 stop7h 23m
Delta
Fri 7/245:05 pm
MLI
- PHL
1 stop6h 54m
Delta
Deal found 6/17![Delta logo]()
$309
This Southwest deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/153:45 pm
PHL
- MDW
Nonstop2h 00m
Southwest
Mon 8/178:00 am
MDW
- PHL
Nonstop2h 10m
Southwest
Deal found 6/21![Southwest logo]()
$285
Last-minute flights from Philadelphia to IllinoisDiscover last-minute flight deals from Philadelphia to Illinois. Data last updated June 22, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Illinois. Data last updated June 22, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” 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 7/98:30 am
PHL
- STL
1 stop10h 07m
Frontier
Mon 7/134:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 6/18![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 7/96:30 am
PHL
- STL
1 stop12h 07m
Frontier
Sun 7/126:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/17![Frontier logo]()
$188
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 7/98:30 am
PHL
- STL
1 stop10h 07m
Frontier
Sat 7/114:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 6/17![Frontier logo]()
$190
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 7/104:40 pm
PHL
- STL
1 stop17h 17m
Frontier
Sun 7/126:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/17![Frontier logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” 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 7/154:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Mon 7/204:57 pm
STL
- PHL
1 stop18h 25m
Frontier
Deal found 6/18![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 7/154:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Wed 7/224:57 pm
STL
- PHL
1 stop18h 25m
Frontier
Deal found 6/17![Frontier logo]()
$185
This Frontier deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/166:05 pm
PHL
- ORD
Nonstop2h 42m
Frontier
Sat 7/188:52 pm
ORD
- PHL
Nonstop2h 23m
Frontier
Deal found 6/21![Frontier logo]()
$206
This Frontier deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/176:11 pm
PHL
- ORD
Nonstop2h 42m
Frontier
Sat 7/188:52 pm
ORD
- PHL
Nonstop2h 23m
Frontier
Deal found 6/21![Frontier logo]()
$202
This Kiwi.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” 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 7/184:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Sat 7/254:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 6/18![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/256:05 pm
PHL
- ORD
Nonstop2h 42m
Frontier
Thu 7/308:52 pm
ORD
- PHL
Nonstop2h 23m
Frontier
Deal found 6/21![Frontier logo]()
$205
This Kiwi.com deal was found by Cheapflights users on 6/17. Clicking the “Pick Dates” 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 7/266:30 am
PHL
- STL
1 stop27h 27m
Frontier
Tue 8/46:34 pm
STL
- PHL
1 stop16h 48m
Frontier
Deal found 6/17![Frontier logo]()
$180
This Trip.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/308:30 am
PHL
- STL
1 stop10h 07m
Frontier
Wed 8/54:09 pm
STL
- PHL
1 stop6h 35m
Frontier
Deal found 6/18![Frontier logo]()
$200
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 June 22, 2026.
Search for one-way flight options from Philadelphia to Illinois. Find affordable one-way fares based on user searches. Data last updated June 22, 2026.
This Trip.com deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/286:30 am
PHL
- STL
1 stop12h 07m
Frontier
Deal found 6/19![Frontier logo]()
$82
This Trip.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” 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 7/148:30 am
PHL
- STL
1 stop10h 07m
Frontier
Deal found 6/18![Frontier logo]()
$83
This Kiwi.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” 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
Deal found 6/18![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/154:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Deal found 6/21![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” 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 7/154:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Deal found 6/18![Frontier logo]()
$89
This Kiwi.com deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/155:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Deal found 6/21![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 6/18. Clicking the “Pick Dates” 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 7/98:30 am
PHL
- STL
1 stop10h 07m
Frontier
Deal found 6/18![Frontier logo]()
$94
This Super.com deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/256:05 pm
PHL
- ORD
Nonstop2h 42m
Frontier
Deal found 6/19![Frontier logo]()
$96
This Super.com deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/246:00 am
PHL
- ORD
Nonstop2h 32m
Frontier
Deal found 6/21![Frontier logo]()
$97
This Expedia deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/66:05 pm
PHL
- ORD
Nonstop2h 42m
Frontier
Deal found 6/21![Frontier logo]()
$98
This Frontier deal was found by Cheapflights users on 6/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/186:05 pm
PHL
- ORD
Nonstop2h 42m
Frontier
Deal found 6/19![Frontier logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/166:05 pm
PHL
- ORD
Nonstop2h 42m
Frontier
Deal found 6/21![Frontier logo]()
$102
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 June 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $171 (Kiwi.com) |
One-way from | $82 (Trip.com) |
Popular in | June |
Cheapest in | January |
Average price | $348 |
Good round-trip deal | $317 or less |
Good one-way deal | $172 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 June 22, 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
Sat 10/10
1:24 pm-2:50 pm
Nonstop2h 26m
Chicago O'Hare Intl
Tue 10/13
9:07 am-12:25 pm
Nonstop2h 18m
$253
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Tue 7/14
4:35 pm-6:00 pm
Nonstop2h 25m
Chicago Midway
Wed 7/22
3:40 pm-6:40 pm
Nonstop2h 00m
$253
PhiladelphiaMoline
PHL - MLI
PHLMLI
Philadelphia
Wed 8/12
12:10 pm-4:25 pm
1 stop5h 15m
Moline Quad-City
Sat 8/15
5:09 pm-1:19 am
1 stop7h 10m
$261
PhiladelphiaMoline
PHL - MLI
PHLMLI
Philadelphia
Wed 8/26
5:16 pm-10:19 pm
1 stop6h 03m
Moline Quad-City
Sat 8/29
11:08 am-5:39 pm
1 stop5h 31m
$261
Quickest round-trip
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Thu 10/1
12:20 pm-1:25 pm
Nonstop2h 05m
Chicago Midway
Wed 10/7
7:55 am-11:00 am
Nonstop2h 05m
$269
PhiladelphiaChampaign
PHL - CMI
PHLCMI
Philadelphia
Wed 9/2
7:30 am-11:11 am
1 stop4h 41m
Champaign University-Willard
Sat 9/5
11:41 am-6:42 pm
1 stop6h 01m
$270
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Tue 7/14
5:05 pm-10:40 pm
1 stop6h 35m
Chicago Midway
Tue 7/21
11:25 am-10:55 pm
2 stops10h 30m
$278
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Sat 8/22
2:10 pm-8:45 pm
1 stop7h 35m
Chicago Midway
Mon 8/24
8:00 am-11:10 am
Nonstop2h 10m
$279
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Sat 8/1
6:05 pm-7:15 pm
Nonstop2h 10m
Chicago Midway
Tue 8/4
2:00 pm-9:50 pm
1 stop6h 50m
$279
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Sat 10/10
4:00 pm-9:15 pm
1 stop6h 15m
Chicago Midway
Tue 10/13
6:10 pm-9:05 pm
Nonstop1h 55m
$279
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-MLI
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-MLI
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 $784). 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 June 22, 2026.
It’s optimal to fly from Philadelphia to Illinois in the evening. By choosing this option you can save up to 22% 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 June 22, 2026.
The most flights from PHL to USIL are scheduled on a Monday (55 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (38 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 40 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 20, 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 June 22, 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
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
7.9
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
7.9
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
7.9
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
7.9
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
7.9
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
7.9
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 June 22, 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 June 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$77 | Average$175 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$83 | Average$266 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$158 | Average$349 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$161 | Average$388 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$162 | Average$345 | FlexibilityNo cancel fee | On-time69% |