$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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Jul 29 — Aug 51
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 29, 2026.
Explore the most affordable flight options available from Philadelphia to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 29, 2026.
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.
Sat 9/125:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Sat 9/1910:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 6/29![Frontier logo]()
$167
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.
Tue 7/284:30 pm
PHL
- STL
1 stop17h 27m
Frontier
Fri 8/74:57 pm
STL
- PHL
1 stop14h 42m
Frontier
Deal found 6/29![Frontier logo]()
$170
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.
Tue 7/216:30 am
PHL
- STL
1 stop12h 07m
Frontier
Fri 7/244:57 pm
STL
- PHL
1 stop18h 25m
Frontier
Deal found 6/29![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 6/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Sat 10/310:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 6/26![Frontier logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/235:38 pm
PHL
- STL
1 stop17h 02m
Frontier
Tue 10/2710:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 6/28![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 6/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/218:30 am
PHL
- STL
1 stop10h 07m
Frontier
Thu 7/306:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/26![Frontier logo]()
$176
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.
Tue 7/218:30 am
PHL
- STL
1 stop10h 07m
Frontier
Thu 7/236:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/29![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 6/24. 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.
Thu 7/231:32 pm
PHL
- STL
1 stop20h 25m
Frontier
Mon 7/274:57 pm
STL
- PHL
1 stop18h 25m
Frontier
Deal found 6/24![Frontier logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 6/26. 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.
Sun 8/26:30 am
PHL
- STL
1 stop27h 27m
Frontier
Fri 8/74:57 pm
STL
- PHL
1 stop14h 42m
Frontier
Deal found 6/26![Frontier logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/224:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Sat 7/254:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 6/28![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 6/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/178:30 am
PHL
- STL
1 stop25h 27m
Frontier
Mon 7/204:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 6/27![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 6/25. 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 8/74:40 pm
PHL
- STL
1 stop17h 17m
Frontier
Sun 8/96:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/25![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 June 29, 2026.
Discover carefully curated flight deals from Philadelphia to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 29, 2026.
This United Airlines deal was found by Cheapflights users on 6/25. 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.
Wed 9/236:25 am
PHL
- ORD
Nonstop2h 25m
United Airlines
Tue 9/296:15 pm
ORD
- PHL
Nonstop2h 14m
United Airlines
Deal found 6/25![United Airlines logo]()
$253
This Southwest deal was found by Cheapflights users on 6/24. 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 9/226:25 am
PHL
- STL
Nonstop2h 15m
Southwest
Sat 9/2610:15 am
STL
- PHL
Nonstop2h 10m
Southwest
Deal found 6/24![Southwest logo]()
$253
This American Airlines deal was found by Cheapflights users on 6/25. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/255:06 am
PHL
- MLI
1 stop6h 52m
American Airlines
Sat 8/811:43 am
MLI
- PHL
1 stop6h 36m
American Airlines
Deal found 6/25![American Airlines logo]()
$261
This Kiwi.com deal was found by Cheapflights users on 6/27. 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.
Wed 7/222:59 pm
PHL
- RFD
1 stop20h 38m
Multiple Airlines
Fri 7/247:50 pm
RFD
- PHL
1 stop12h 02m
Multiple Airlines
Deal found 6/27![Multiple Airlines logo]()
$264
This Delta deal was found by Cheapflights users on 6/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/155:25 pm
PHL
- ORD
1 stop4h 05m
Delta
Tue 8/186:40 am
ORD
- PHL
1 stop5h 46m
Delta
Deal found 6/27![Delta logo]()
$273
This Southwest deal was found by Cheapflights users on 6/27. 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.
Tue 8/41:45 pm
PHL
- STL
1 stop5h 10m
Southwest
Tue 8/116:40 pm
STL
- PHL
Nonstop2h 10m
Southwest
Deal found 6/27![Southwest logo]()
$255
This American Airlines deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/55:43 am
PHL
- CMI
1 stop6h 28m
American Airlines
Sat 9/121:23 pm
CMI
- PHL
1 stop5h 53m
American Airlines
Deal found 6/28![American Airlines logo]()
$270
This Southwest deal was found by Cheapflights users on 6/27. 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.
Tue 8/46:25 pm
PHL
- MDW
Nonstop2h 05m
Southwest
Thu 8/136:45 pm
MDW
- PHL
Nonstop1h 55m
Southwest
Deal found 6/27![Southwest logo]()
$257
This Delta deal was found by Cheapflights users on 6/24. 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 8/2911:29 am
PHL
- ORD
1 stop8h 30m
Delta
Mon 8/316:25 pm
ORD
- PHL
1 stop5h 54m
Delta
Deal found 6/24![Delta logo]()
$289
This United Airlines deal was found by Cheapflights users on 6/26. 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.
Fri 8/77:00 pm
PHL
- MLI
1 stop5h 16m
United Airlines
Sun 8/96:30 am
MLI
- PHL
1 stop4h 55m
United Airlines
Deal found 6/26![United Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 6/27. 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 8/65:55 am
PHL
- STL
1 stop5h 15m
Southwest
Tue 8/117:15 am
STL
- PHL
2 stops9h 45m
Southwest
Deal found 6/27![Southwest logo]()
$270
This American Airlines deal was found by Cheapflights users on 6/24. 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 9/1912:39 pm
PHL
- PIA
1 stop5h 19m
American Airlines
Sun 9/275:28 pm
PIA
- PHL
1 stop5h 44m
American Airlines
Deal found 6/24![American Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 6/25. 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.
Thu 7/236:00 am
PHL
- PIA
1 stop7h 38m
United Airlines
Sun 7/266:12 pm
PIA
- PHL
1 stop5h 45m
United Airlines
Deal found 6/25![United Airlines logo]()
$309
This Kiwi.com deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:33 pm
PHL
- RFD
1 stop14h 16m
Multiple Airlines
Sun 8/1611:37 am
RFD
- PHL
2 stops18h 38m
Multiple Airlines
Deal found 6/25![Multiple Airlines logo]()
$344
This Delta deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/165:15 am
PHL
- MLI
1 stop5h 57m
Delta
Mon 7/205:05 pm
MLI
- PHL
1 stop6h 54m
Delta
Deal found 6/28![Delta logo]()
$324
This Southwest deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/65:25 pm
PHL
- MDW
1 stop6h 55m
Southwest
Mon 8/102:55 pm
MDW
- PHL
Nonstop2h 00m
Southwest
Deal found 6/28![Southwest logo]()
$279
This Kiwi.com deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
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 6/28![Multiple Airlines logo]()
$349
This United Airlines deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/177:00 pm
PHL
- MLI
1 stop5h 16m
United Airlines
Mon 7/206:30 pm
MLI
- PHL
1 stop5h 27m
United Airlines
Deal found 6/28![United Airlines logo]()
$324
This Delta deal was found by Cheapflights users on 6/26. 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.
Wed 11/46:35 am
PHL
- EVV
1 stop7h 18m
Delta
Wed 11/115:45 pm
EVV
- PHL
1 stop4h 11m
Delta
Deal found 6/26![Delta logo]()
$331
This American Airlines deal was found by Cheapflights users on 6/24. 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.
Sun 7/265:15 am
PHL
- CMI
1 stop6h 52m
American Airlines
Sat 8/16:34 pm
CMI
- PHL
1 stop5h 12m
American Airlines
Deal found 6/24![American Airlines logo]()
$345
This Southwest deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/297:05 am
PHL
- MDW
2 stops11h 00m
Southwest
Mon 8/315:30 am
MDW
- PHL
2 stops10h 55m
Southwest
Deal found 6/28![Southwest logo]()
$287
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.
Sat 8/85:00 pm
PHL
- ORD
Nonstop2h 33m
United Airlines
Sat 9/59:05 am
ORD
- PHL
Nonstop2h 18m
United Airlines
Deal found 6/29![United Airlines logo]()
$325
This Kiwi.com deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/148:10 am
PHL
- RFD
1 stop10h 26m
Multiple Airlines
Sun 8/1611:37 am
RFD
- PHL
2 stops18h 38m
Multiple Airlines
Deal found 6/24![Multiple Airlines logo]()
$368
This Delta deal was found by Cheapflights users on 6/24. 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.
Thu 7/94:08 pm
PHL
- MLI
1 stop7h 23m
Delta
Mon 7/135:05 pm
MLI
- PHL
1 stop6h 54m
Delta
Deal found 6/24![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 6/27. 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.
Wed 8/51:45 pm
PHL
- STL
2 stops7h 15m
Southwest
Mon 8/1010:05 am
STL
- PHL
2 stops6h 50m
Southwest
Deal found 6/27![Southwest logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/25:16 pm
PHL
- RFD
2 stops22h 47m
Multiple Airlines
Mon 9/76:02 pm
RFD
- PHL
1 stop20h 14m
Multiple Airlines
Deal found 6/28![Multiple Airlines logo]()
$381
This United Airlines deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/177:00 pm
PHL
- PIA
1 stop5h 20m
United Airlines
Sun 7/196:11 pm
PIA
- PHL
1 stop5h 46m
United Airlines
Deal found 6/28![United Airlines logo]()
$355
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.
Sat 7/185:06 pm
PHL
- ORD
1 stop7h 47m
Delta
Sat 7/255:18 pm
ORD
- PHL
1 stop4h 58m
Delta
Deal found 6/29![Delta logo]()
$361
This Southwest deal was found by Cheapflights users on 6/25. 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 8/158:55 am
PHL
- STL
2 stops8h 55m
Southwest
Mon 8/1711:05 am
STL
- PHL
1 stop3h 55m
Southwest
Deal found 6/25![Southwest logo]()
$301
This United Airlines deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/168:05 am
PHL
- PIA
1 stop6h 52m
United Airlines
Sun 7/196:11 pm
PIA
- PHL
1 stop5h 46m
United Airlines
Deal found 6/28![United Airlines logo]()
$355
Last-minute flights from Philadelphia to IllinoisDiscover last-minute flight deals from Philadelphia to Illinois. Data last updated June 29, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Illinois. Data last updated June 29, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 6/26. 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 7/166:30 am
PHL
- STL
1 stop27h 27m
Frontier
Fri 7/174:57 pm
STL
- PHL
1 stop14h 42m
Frontier
Deal found 6/26![Frontier logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 6/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/178:30 am
PHL
- STL
1 stop25h 27m
Frontier
Mon 7/204:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 6/27![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 6/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/171:32 pm
PHL
- STL
1 stop20h 25m
Frontier
Sun 7/196:34 pm
STL
- PHL
1 stop16h 48m
Frontier
Deal found 6/27![Frontier logo]()
$190
This Kiwi.com deal was found by Cheapflights users on 6/26. 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 7/184:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Mon 7/204:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 6/26![Frontier logo]()
$193
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.
Tue 7/216:30 am
PHL
- STL
1 stop12h 07m
Frontier
Fri 7/244:57 pm
STL
- PHL
1 stop18h 25m
Frontier
Deal found 6/29![Frontier logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 6/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/218:30 am
PHL
- STL
1 stop10h 07m
Frontier
Thu 7/306:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/26![Frontier logo]()
$176
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.
Tue 7/218:30 am
PHL
- STL
1 stop10h 07m
Frontier
Thu 7/236:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/29![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/224:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Sat 7/254:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 6/28![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 6/25. 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 7/236:30 am
PHL
- STL
1 stop12h 07m
Frontier
Sun 7/266:34 pm
STL
- PHL
1 stop23h 46m
Frontier
Deal found 6/25![Frontier logo]()
$201
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.
Tue 7/288:30 am
PHL
- STL
1 stop10h 07m
Frontier
Tue 8/46:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/29![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 6/25. 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 7/314:40 pm
PHL
- STL
1 stop17h 17m
Frontier
Sun 8/26:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/25![Frontier logo]()
$186
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 7/314:40 pm
PHL
- STL
1 stop17h 17m
Frontier
Thu 8/66:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/29![Frontier logo]()
$189
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 29, 2026.
Search for one-way flight options from Philadelphia to Illinois. Find affordable one-way fares based on user searches. Data last updated June 29, 2026.
This Trip.com deal was found by Cheapflights users on 6/25. 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 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 6/25![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/124:30 pm
PHL
- STL
1 stop26h 07m
Frontier
Deal found 6/28![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 6/25. 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.
Wed 8/264:45 pm
PHL
- STL
1 stop25h 37m
Frontier
Deal found 6/25![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 6/27. 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.
Wed 9/235:28 pm
PHL
- STL
1 stop17h 12m
Frontier
Deal found 6/27![Frontier logo]()
$89
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 8/144:40 pm
PHL
- STL
1 stop17h 17m
Frontier
Deal found 6/29![Frontier logo]()
$95
This Kiwi.com deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/204:40 pm
PHL
- STL
1 stop25h 57m
Frontier
Deal found 6/28![Frontier logo]()
$97
This Frontier deal was found by Cheapflights users on 6/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/176:11 pm
PHL
- ORD
Nonstop2h 42m
Frontier
Deal found 6/25![Frontier logo]()
$98
This Kiwi.com deal was found by Cheapflights users on 6/25. 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.
Mon 8/246:30 am
PHL
- STL
1 stop11h 52m
Frontier
Deal found 6/25![Frontier logo]()
$98
This Super.com deal was found by Cheapflights users on 6/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/310:22 am
PHL
- ORD
Nonstop2h 33m
Frontier
Deal found 6/28![Frontier logo]()
$100
This Trip.com deal was found by Cheapflights users on 6/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/36:30 am
PHL
- STL
1 stop11h 52m
Frontier
Deal found 6/26![Frontier logo]()
$100
This Super.com deal was found by Cheapflights users on 6/27. 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 Super.com 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 6/27![Frontier logo]()
$101
This Kiwi.com deal was found by Cheapflights users on 6/27. 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.
Mon 7/276:11 pm
PHL
- ORD
Nonstop2h 42m
Frontier
Deal found 6/27![Frontier logo]()
$105
Find flight deals from Philadelphia to Illinois
Keep the following information in mind while searching for Philadelphia to Illinois flight deals. Data was last updated June 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $167 (Kiwi.com) |
One-way from | $82 (Trip.com) |
Popular in | June |
Cheapest in | January |
Average price | $351 |
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 June 29, 2026.
Use the filters below to find and compare flights from Philadelphia to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Wed 9/23
6:25 am-7:50 am
Nonstop2h 25m
Chicago O'Hare Intl
Tue 9/29
6:15 pm-9:29 pm
Nonstop2h 14m
$253
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Tue 9/22
6:25 am-7:40 am
Nonstop2h 15m
Lambert-St Louis
Sat 9/26
10:15 am-1:25 pm
Nonstop2h 10m
$253
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Tue 8/4
1:45 pm-5:55 pm
1 stop5h 10m
Lambert-St Louis
Tue 8/11
6:40 pm-9:50 pm
Nonstop2h 10m
$255
Quickest round-trip
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Tue 8/4
6:25 pm-7:30 pm
Nonstop2h 05m
Chicago Midway
Thu 8/13
6:45 pm-9:40 pm
Nonstop1h 55m
$257
PhiladelphiaMoline
PHL - MLI
PHLMLI
Philadelphia
Sat 7/25
5:06 am-10:58 am
1 stop6h 52m
Moline Quad-City
Sat 8/8
11:43 am-7:19 pm
1 stop6h 36m
$261
PhiladelphiaChicago
PHL - RFD
PHLRFD
Philadelphia
Wed 7/22
2:59 pm-10:37 am
1 stop20h 38m
Chicago Greater Rockford
Fri 7/24
7:50 pm-8:52 am
1 stop12h 02m
$264
PhiladelphiaChampaign
PHL - CMI
PHLCMI
Philadelphia
Sat 9/5
5:43 am-11:11 am
1 stop6h 28m
Champaign University-Willard
Sat 9/12
1:23 pm-8:16 pm
1 stop5h 53m
$270
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Thu 8/6
5:55 am-10:10 am
1 stop5h 15m
Lambert-St Louis
Tue 8/11
7:15 am-6:00 pm
2 stops9h 45m
$270
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Sat 8/15
5:25 pm-8:30 pm
1 stop4h 05m
Chicago O'Hare Intl
Tue 8/18
6:40 am-1:26 pm
1 stop5h 46m
$273
PhiladelphiaChicago
PHL - MDW
PHLMDW
Philadelphia
Thu 8/6
5:25 pm-11:20 pm
1 stop6h 55m
Chicago Midway
Mon 8/10
2:55 pm-5:55 pm
Nonstop2h 00m
$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-RFD
PHL-MDW
PHL-EVV
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Philadelphia to Illinois
PHL-USIL
PHL-STL
PHL-ORD
PHL-RFD
PHL-MDW
What is the cheapest month to book a flight from Philadelphia to Illinois?
Currently, 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 29, 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 June 29, 2026.
The most flights from PHL to USIL are scheduled on a Monday (53 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (23 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 June 29, 2026.
See what other customers who have flown with Southwest,Delta, andUnited Airlines from Philadelphia to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
7.9
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
7.9
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
7.9
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
7.9
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
7.9
Comfort
8.0
Crew
8.6
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Boarding
8.1
Overall
7.9
Comfort
8.0
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 June 29, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Philadelphia to Illinois flights
Consider these flights traveling from Philadelphia to Illinois.
Top 5 airlines flying from Philadelphia to Illinois
Discover the top 5 airlines that operate flights from Philadelphia to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$77 | Average$176 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$83 | Average$266 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$158 | Average$351 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$161 | Average$391 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$162 | Average$345 | FlexibilityNo cancel fee | On-time69% |