$69+ 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 3/17. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Mar 10 — Mar 171
1 adult, Economy
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Find cheap flights from Philadelphia to Illinois with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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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 February 8, 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 February 8, 2026.
This Super.com deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” 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 2/205:30 am
PHL
- ORD
Nonstop2h 36m
Frontier
Mon 2/2310:15 am
ORD
- PHL
Nonstop2h 09m
Frontier
Deal found 2/5![Frontier logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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 2/205:30 am
PHL
- ORD
Nonstop2h 36m
Multiple Airlines
Tue 3/108:16 pm
ORD
- PHL
1 stop11h 28m
Multiple Airlines
Deal found 2/7![Multiple Airlines logo]()
$126
This Mytrip deal was found by Cheapflights users on 2/4. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/205:30 am
PHL
- ORD
Nonstop2h 36m
Multiple Airlines
Fri 2/278:16 pm
ORD
- PHL
1 stop11h 28m
Multiple Airlines
Deal found 2/4![Multiple Airlines logo]()
$127
This Frontier deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” 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 2/237:35 am
PHL
- ORD
Nonstop2h 36m
Frontier
Mon 3/210:15 am
ORD
- PHL
Nonstop2h 09m
Frontier
Deal found 2/5![Frontier logo]()
$128
This Priceline deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/311:40 am
PHL
- MDW
1 stop8h 27m
Frontier
Wed 3/47:15 am
MDW
- PHL
1 stop8h 57m
Frontier
Deal found 2/5![Frontier logo]()
$128
This Cheapflightsfares deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/36:00 am
PHL
- ORD
1 stop14h 11m
Spirit Airlines
Tue 3/107:00 am
ORD
- PHL
1 stop11h 52m
Spirit Airlines
Deal found 2/8![Spirit Airlines logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” 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 2/245:26 pm
PHL
- ORD
1 stop7h 21m
Multiple Airlines
Mon 3/211:33 am
ORD
- PHL
1 stop22h 38m
Multiple Airlines
Deal found 2/5![Multiple Airlines logo]()
$133
This Super.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” 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 2/205:30 am
PHL
- ORD
Nonstop2h 36m
Frontier
Sun 2/222:13 pm
ORD
- PHL
1 stop16h 59m
Frontier
Deal found 2/8![Frontier logo]()
$134
This Expedia deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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.
Mon 3/26:18 pm
PHL
- STL
1 stop6h 41m
Frontier
Tue 3/33:49 pm
STL
- PHL
1 stop21h 51m
Frontier
Deal found 2/6![Frontier logo]()
$138
This Expedia deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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.
Mon 2/2312:28 pm
PHL
- MDW
1 stop11h 01m
Frontier
Sat 2/286:25 am
MDW
- PHL
1 stop10h 46m
Frontier
Deal found 2/7![Frontier logo]()
$144
This Expedia deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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.
Sat 2/2812:28 pm
PHL
- MDW
1 stop10h 11m
Frontier
Mon 3/22:19 pm
MDW
- PHL
1 stop9h 42m
Frontier
Deal found 2/6![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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 3/37:46 pm
PHL
- STL
1 stop27h 41m
Multiple Airlines
Fri 3/61:09 pm
STL
- PHL
1 stop10h 43m
Multiple Airlines
Deal found 2/7![Multiple Airlines logo]()
$153
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 February 8, 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 February 8, 2026.
This United Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” 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 4/254:55 pm
PHL
- ORD
Nonstop2h 28m
United Airlines
Sat 5/29:39 pm
ORD
- PHL
Nonstop2h 06m
United Airlines
Deal found 2/8![United Airlines logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 2/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/43:45 pm
PHL
- STL
1 stop7h 42m
Frontier
Sat 3/78:12 pm
STL
- PHL
2 stops33h 55m
Frontier
Deal found 2/4![Frontier logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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 2/1811:34 am
PHL
- ORD
1 stop6h 18m
Multiple Airlines
Tue 3/107:00 am
ORD
- PHL
1 stop11h 52m
Multiple Airlines
Deal found 2/7![Multiple Airlines logo]()
$178
This Delta deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 4/207:39 pm
PHL
- ORD
1 stop5h 20m
Delta
Thu 4/2310:49 am
ORD
- PHL
1 stop4h 48m
Delta
Deal found 2/6![Delta logo]()
$197
This Mytrip deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/235:26 pm
PHL
- ORD
2 stops19h 21m
Spirit Airlines
Mon 3/24:43 pm
ORD
- PHL
1 stop15h 01m
Spirit Airlines
Deal found 2/7![Spirit Airlines logo]()
$216
This Southwest deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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 3/1412:10 pm
PHL
- MDW
Nonstop2h 15m
Southwest
Wed 3/187:45 am
MDW
- PHL
Nonstop1h 50m
Southwest
Deal found 2/7![Southwest logo]()
$217
This American Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 4/246:00 am
PHL
- MLI
1 stop7h 21m
American Airlines
Sun 4/266:40 pm
MLI
- PHL
1 stop4h 19m
American Airlines
Deal found 2/6![American Airlines logo]()
$334
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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 2/237:35 am
PHL
- ORD
Nonstop2h 36m
Frontier
Tue 3/107:41 pm
ORD
- PHL
1 stop14h 18m
Frontier
Deal found 2/7![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 3/56:54 pm
PHL
- STL
1 stop17h 55m
Multiple Airlines
Tue 3/104:51 pm
STL
- PHL
2 stops18h 22m
Multiple Airlines
Deal found 2/6![Multiple Airlines logo]()
$192
This Delta deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 4/249:42 am
PHL
- ORD
1 stop4h 03m
Delta
Sun 4/261:36 pm
ORD
- PHL
1 stop4h 42m
Delta
Deal found 2/6![Delta logo]()
$197
This CheapOair deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/26:18 pm
PHL
- STL
1 stop6h 41m
Frontier
Wed 3/45:18 pm
STL
- PHL
1 stop22h 19m
Frontier
Deal found 2/6![Frontier logo]()
$186
This United Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 4/2211:36 am
PHL
- ORD
Nonstop2h 28m
United Airlines
Fri 4/249:40 pm
ORD
- PHL
Nonstop2h 05m
United Airlines
Deal found 2/6![United Airlines logo]()
$208
This Delta deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 4/195:44 am
PHL
- ORD
1 stop5h 25m
Delta
Sun 4/261:36 pm
ORD
- PHL
1 stop4h 42m
Delta
Deal found 2/6![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/86:35 pm
PHL
- MDW
1 stop6h 20m
Southwest
Sat 5/97:40 am
MDW
- PHL
Nonstop1h 55m
Southwest
Deal found 2/8![Southwest logo]()
$227
This United Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 5/610:00 am
PHL
- ORD
Nonstop2h 29m
United Airlines
Sun 5/107:15 am
ORD
- PHL
Nonstop2h 14m
United Airlines
Deal found 2/6![United Airlines logo]()
$208
This Delta deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 4/195:44 am
PHL
- ORD
1 stop5h 25m
Delta
Thu 4/2310:49 am
ORD
- PHL
1 stop4h 48m
Delta
Deal found 2/6![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 3/246:05 pm
PHL
- MDW
Nonstop2h 15m
Southwest
Wed 3/2510:30 am
MDW
- PHL
1 stop4h 45m
Southwest
Deal found 2/6![Southwest logo]()
$227
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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 4/165:05 am
PHL
- STL
1 stop6h 25m
Frontier
Sun 4/1911:21 am
STL
- PHL
1 stop19h 49m
Frontier
Deal found 2/7![Frontier logo]()
$208
This Delta deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 4/195:44 am
PHL
- ORD
1 stop5h 25m
Delta
Mon 4/271:36 pm
ORD
- PHL
1 stop4h 42m
Delta
Deal found 2/6![Delta logo]()
$197
This United Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 3/286:30 am
PHL
- ORD
Nonstop2h 30m
United Airlines
Wed 4/111:05 am
ORD
- PHL
Nonstop2h 11m
United Airlines
Deal found 2/6![United Airlines logo]()
$217
This Kiwi.com deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” 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 2/288:59 pm
PHL
- RFD
1 stop13h 48m
Multiple Airlines
Thu 3/510:37 am
RFD
- PHL
1 stop8h 51m
Multiple Airlines
Deal found 2/5![Multiple Airlines logo]()
$241
This Delta deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 4/186:00 am
PHL
- MDW
1 stop3h 47m
Delta
Thu 4/239:27 am
MDW
- PHL
1 stop6h 10m
Delta
Deal found 2/6![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” 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 3/255:30 am
PHL
- MDW
2 stops11h 40m
Southwest
Wed 4/13:35 pm
MDW
- PHL
1 stop6h 05m
Southwest
Deal found 2/5![Southwest logo]()
$242
This Kiwi.com deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” 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 3/46:00 am
PHL
- STL
2 stops17h 27m
Multiple Airlines
Thu 3/53:49 pm
STL
- PHL
1 stop14h 43m
Multiple Airlines
Deal found 2/5![Multiple Airlines logo]()
$256
This Delta deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 4/196:00 am
PHL
- MDW
1 stop3h 47m
Delta
Thu 4/239:27 am
MDW
- PHL
1 stop6h 10m
Delta
Deal found 2/6![Delta logo]()
$197
This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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 5/91:20 pm
PHL
- CMI
1 stop5h 06m
United Airlines
Mon 5/117:00 pm
CMI
- PHL
1 stop4h 45m
United Airlines
Deal found 2/7![United Airlines logo]()
$258
This Delta deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 4/206:29 pm
PHL
- MDW
1 stop4h 59m
Delta
Fri 4/241:23 pm
MDW
- PHL
1 stop4h 55m
Delta
Deal found 2/6![Delta logo]()
$197
This American Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” 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.
Mon 3/29:20 pm
PHL
- STL
Nonstop2h 44m
American Airlines
Wed 3/46:00 am
STL
- PHL
Nonstop2h 18m
American Airlines
Deal found 2/8![American Airlines logo]()
$356
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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 4/165:45 am
PHL
- STL
2 stops14h 27m
Multiple Airlines
Sun 4/1911:21 am
STL
- PHL
1 stop19h 49m
Multiple Airlines
Deal found 2/7![Multiple Airlines logo]()
$272
This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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 5/91:20 pm
PHL
- CMI
1 stop5h 06m
United Airlines
Sat 5/167:00 pm
CMI
- PHL
1 stop4h 45m
United Airlines
Deal found 2/7![United Airlines logo]()
$258
Last-minute flights from Philadelphia to IllinoisDiscover last-minute flight deals from Philadelphia to Illinois. Data last updated February 8, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Illinois. Data last updated February 8, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” 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 2/205:30 am
PHL
- ORD
Nonstop2h 36m
Frontier
Mon 2/2310:15 am
ORD
- PHL
Nonstop2h 09m
Frontier
Deal found 2/5![Frontier logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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 2/205:30 am
PHL
- ORD
Nonstop2h 36m
Multiple Airlines
Tue 3/108:16 pm
ORD
- PHL
1 stop11h 28m
Multiple Airlines
Deal found 2/7![Multiple Airlines logo]()
$126
This Mytrip deal was found by Cheapflights users on 2/4. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/205:30 am
PHL
- ORD
Nonstop2h 36m
Multiple Airlines
Fri 2/278:16 pm
ORD
- PHL
1 stop11h 28m
Multiple Airlines
Deal found 2/4![Multiple Airlines logo]()
$127
This Super.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” 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 2/205:30 am
PHL
- ORD
Nonstop2h 36m
Frontier
Sun 2/222:13 pm
ORD
- PHL
1 stop16h 59m
Frontier
Deal found 2/8![Frontier logo]()
$134
This Frontier deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” 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 2/237:35 am
PHL
- ORD
Nonstop2h 36m
Frontier
Mon 3/210:15 am
ORD
- PHL
Nonstop2h 09m
Frontier
Deal found 2/5![Frontier logo]()
$128
This Expedia deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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.
Mon 2/2312:28 pm
PHL
- MDW
1 stop11h 01m
Frontier
Sat 2/286:25 am
MDW
- PHL
1 stop10h 46m
Frontier
Deal found 2/7![Frontier logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” 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 2/245:26 pm
PHL
- ORD
1 stop7h 21m
Multiple Airlines
Mon 3/211:33 am
ORD
- PHL
1 stop22h 38m
Multiple Airlines
Deal found 2/5![Multiple Airlines logo]()
$133
This Expedia deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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.
Sat 2/2812:28 pm
PHL
- MDW
1 stop10h 11m
Frontier
Mon 3/22:19 pm
MDW
- PHL
1 stop9h 42m
Frontier
Deal found 2/6![Frontier logo]()
$148
This Expedia deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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.
Mon 3/26:18 pm
PHL
- STL
1 stop6h 41m
Frontier
Tue 3/33:49 pm
STL
- PHL
1 stop21h 51m
Frontier
Deal found 2/6![Frontier logo]()
$138
This Priceline deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/311:40 am
PHL
- MDW
1 stop8h 27m
Frontier
Wed 3/47:15 am
MDW
- PHL
1 stop8h 57m
Frontier
Deal found 2/5![Frontier logo]()
$128
This Cheapflightsfares deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/36:00 am
PHL
- ORD
1 stop14h 11m
Spirit Airlines
Tue 3/107:00 am
ORD
- PHL
1 stop11h 52m
Spirit Airlines
Deal found 2/8![Spirit Airlines logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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 3/37:46 pm
PHL
- STL
1 stop27h 41m
Multiple Airlines
Fri 3/61:09 pm
STL
- PHL
1 stop10h 43m
Multiple Airlines
Deal found 2/7![Multiple Airlines logo]()
$153
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 February 8, 2026.
Search for one-way flight options from Philadelphia to Illinois. Find affordable one-way fares based on user searches. Data last updated February 8, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/179:53 am
PHL
- ORD
1 stop9h 38m
Spirit Airlines
Deal found 2/5![Spirit Airlines logo]()
$69
This Super.com deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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.
Wed 3/115:26 pm
PHL
- ORD
1 stop7h 21m
Spirit Airlines
Deal found 2/6![Spirit Airlines logo]()
$70
This Booking.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/2812:28 pm
PHL
- MDW
1 stop10h 11m
Frontier
Deal found 2/8![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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 3/37:46 pm
PHL
- STL
1 stop27h 41m
Multiple Airlines
Deal found 2/7![Multiple Airlines logo]()
$70
This Cheapflightsfares deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/95:57 pm
PHL
- ORD
1 stop6h 44m
Spirit Airlines
Deal found 2/8![Spirit Airlines logo]()
$71
This Kiwi.com deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 3/49:00 am
PHL
- ORD
1 stop15h 47m
Multiple Airlines
Deal found 2/6![Multiple Airlines logo]()
$72
This Kiwi.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” 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 3/246:12 pm
PHL
- MDW
1 stop24h 36m
Frontier
Deal found 2/8![Frontier logo]()
$72
This Super.com deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” 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 2/135:30 am
PHL
- ORD
Nonstop2h 36m
Frontier
Deal found 2/5![Frontier logo]()
$73
This Trip.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” 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.
Mon 3/165:05 am
PHL
- MDW
1 stop18h 14m
Frontier
Deal found 2/8![Frontier logo]()
$73
This Trip.com deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 3/56:54 pm
PHL
- STL
1 stop17h 55m
Frontier
Deal found 2/6![Frontier logo]()
$73
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” 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 4/72:09 pm
PHL
- ORD
1 stop20h 41m
Multiple Airlines
Deal found 2/7![Multiple Airlines logo]()
$74
This Trip.com deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” 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.
Sat 3/75:05 am
PHL
- MDW
1 stop18h 19m
Frontier
Deal found 2/5![Frontier logo]()
$74
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 February 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $122 (Super.com) |
One-way from | $69 (Cheapflightsfares) |
Popular in | February |
Cheapest in | September |
Average price | $323 |
Good round-trip deal | $334 or less |
Good one-way deal | $173 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 February 8, 2026.
Use the filters below to find and compare flights from Philadelphia to Illinois that are best for you.
Fly from
Philadelphia
Fly to
Illinois
Route
Depart
Return
Price
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Sat 4/25
4:55 pm-6:23 pm
Nonstop2h 28m
Chicago O'Hare Intl
Sat 5/2
9:39 pm-12:45 am
Nonstop2h 06m
$137
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Wed 3/4
3:45 pm-10:27 pm
1 stop7h 42m
Lambert-St Louis
Sat 3/7
8:12 pm-7:07 am
2 stops33h 55m
$165
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Mon 2/23
7:35 am-9:11 am
Nonstop2h 36m
Chicago O'Hare Intl
Tue 3/10
7:41 pm-10:59 am
1 stop14h 18m
$169
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Wed 2/18
11:34 am-4:52 pm
1 stop6h 18m
Chicago O'Hare Intl
Tue 3/10
7:00 am-7:52 pm
1 stop11h 52m
$178
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Mon 3/2
6:18 pm-11:59 pm
1 stop6h 41m
Lambert-St Louis
Wed 3/4
5:18 pm-4:37 pm
1 stop22h 19m
$186
PhiladelphiaSt. Louis
PHL - STL
PHLSTL
Philadelphia
Thu 3/5
6:54 pm-11:49 am
1 stop17h 55m
Lambert-St Louis
Tue 3/10
4:51 pm-12:13 pm
2 stops18h 22m
$192
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Mon 4/20
7:39 pm-11:59 pm
1 stop5h 20m
Chicago O'Hare Intl
Thu 4/23
10:49 am-4:37 pm
1 stop4h 48m
$197
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Fri 4/24
9:42 am-12:45 pm
1 stop4h 03m
Chicago O'Hare Intl
Sun 4/26
1:36 pm-7:18 pm
1 stop4h 42m
$197
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Sun 4/19
5:44 am-10:09 am
1 stop5h 25m
Chicago O'Hare Intl
Sun 4/26
1:36 pm-7:18 pm
1 stop4h 42m
$197
PhiladelphiaChicago
PHL - ORD
PHLORD
Philadelphia
Sun 4/19
5:44 am-10:09 am
1 stop5h 25m
Chicago O'Hare Intl
Thu 4/23
10:49 am-4:37 pm
1 stop4h 48m
$197
Showing 1-10 of 60 results
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-RFD
PHL-ORD
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-RFD
PHL-ORD
PHL-MDW
What is the cheapest month to book a flight from Philadelphia to Illinois?
Currently, December is the cheapest month in which you can book a flight from Philadelphia to Illinois (average of $48). Flying from Philadelphia to Illinois in July is currently the most expensive (average of $119). 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 February 8, 2026.
It’s optimal to fly from Philadelphia to Illinois in the evening. By choosing this option you can save up to 33% on the cost of your flight, compared to a flight at noon.
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 January 31, 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. Monday at noon 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 February 8, 2026.
See what other customers who have flown with Southwest, Delta, and United 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.
Comfort
8.0
Entertainment
7.5
Overall
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Overall
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Overall
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Overall
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Overall
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Entertainment
7.5
Overall
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
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 February 8, 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 February 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$74 | Average$173 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$98 | Average$347 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$155 | Average$379 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$159 | Average$319 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$164 | Average$406 | FlexibilityNo cancel fee | On-time71% |