$66+ Cheap flights from Illinois to Philadelphia (PHL)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/21. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — PHL
Sep 20 — Sep 271
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to Philadelphia 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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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Illinois to Philadelphia
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Cheapest flights from Illinois to PhiladelphiaExplore the most affordable flight options available from Illinois to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 21, 2026.
Explore the most affordable flight options available from Illinois to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 21, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/18. 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.
Mon 11/910:35 am -
1 stop20h 01m
Wed 11/115:28 pm -
1 stop17h 12m
Deal found 8/18![Frontier logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 8/19. 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.
Mon 10/266:35 pm -
1 stop11h 46m
Mon 11/212:35 pm -
1 stop6h 05m
Deal found 8/19![Frontier logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 8/20. 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.
Mon 10/126:35 pm -
1 stop11h 46m
Wed 10/1412:35 pm -
1 stop6h 05m
Deal found 8/20![Frontier logo]()
$142
This Kiwi.com deal was found by Cheapflights users on 8/17. 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.
Mon 9/142:29 pm -
1 stop26h 45m
Mon 9/218:41 am -
1 stop5h 29m
Deal found 8/17![Frontier logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 8/19. 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.
Fri 9/252:29 pm -
1 stop15h 47m
Mon 9/288:41 am -
1 stop5h 29m
Deal found 8/19![Frontier logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 8/19. 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.
Mon 9/282:29 pm -
1 stop15h 47m
Tue 10/65:32 pm -
1 stop20h 38m
Deal found 8/19![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 8/18. 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.
Mon 9/282:29 pm -
1 stop15h 47m
Wed 9/308:41 am -
1 stop5h 29m
Deal found 8/18![Frontier logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 8/18. 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.
Fri 9/252:29 pm -
1 stop15h 47m
Mon 10/128:30 am -
1 stop10h 10m
Deal found 8/18![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 10/96:35 pm -
1 stop22h 40m
Mon 10/128:30 am -
1 stop10h 10m
Deal found 8/16![Frontier logo]()
$150
This Kiwi.com deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 9/252:29 pm -
1 stop15h 47m
Tue 9/2912:40 pm -
1 stop25h 30m
Deal found 8/16![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 8/18. 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.
Fri 10/96:35 pm -
1 stop22h 40m
Thu 10/156:03 pm -
1 stop24h 37m
Deal found 8/18![Frontier logo]()
$155
This CheapOair deal was found by Cheapflights users on 8/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/84:41 pm -
Nonstop2h 23m
Sun 10/119:09 pm -
Nonstop2h 30m
Deal found 8/19![Frontier logo]()
$157
Best flights from Illinois to PhiladelphiaDiscover carefully curated flight deals from Illinois to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 21, 2026.
Discover carefully curated flight deals from Illinois to Philadelphia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 21, 2026.
This Southwest deal was found by Cheapflights users on 8/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:40 pm -
Nonstop2h 15m
Thu 9/106:20 am -
Nonstop2h 15m
Deal found 8/18![Southwest logo]()
$257
This Delta deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 12/910:14 am -
1 stop5h 21m
Mon 12/145:25 pm -
1 stop4h 26m
Deal found 8/16![Delta logo]()
$277
This United Airlines deal was found by Cheapflights users on 8/19. 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.
Wed 9/166:13 pm -
Nonstop2h 14m
Wed 9/237:40 pm -
1 stop5h 00m
Deal found 8/19![United Airlines logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 8/19. 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.
Fri 9/117:46 pm -
1 stop17h 44m
Mon 9/146:00 am -
1 stop13h 46m
Deal found 8/19![Multiple Airlines logo]()
$310
This American Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 10/292:30 pm -
1 stop7h 22m
Sun 11/17:24 am -
1 stop7h 33m
Deal found 8/16![American Airlines logo]()
$319
This KAYAK deal was found by Cheapflights users on 8/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/93:00 pm -
1 stop7h 32m
Thu 9/107:00 am -
1 stop7h 45m
Deal found 8/17![JetBlue logo]()
$357
This Southwest deal was found by Cheapflights users on 8/19. 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.
Tue 10/276:40 pm -
Nonstop2h 05m
Wed 10/286:25 am -
Nonstop2h 20m
Deal found 8/19![Southwest logo]()
$257
This Southwest deal was found by Cheapflights users on 8/19. 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.
Mon 10/267:50 pm -
Nonstop2h 20m
Mon 11/27:25 pm -
Nonstop2h 35m
Deal found 8/19![Southwest logo]()
$257
This United Airlines deal was found by Cheapflights users on 8/18. 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.
Wed 9/2311:15 am -
1 stop6h 39m
Sat 9/266:55 pm -
Nonstop2h 30m
Deal found 8/18![United Airlines logo]()
$287
This Delta deal was found by Cheapflights users on 8/19. 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 9/66:00 am -
1 stop5h 44m
Fri 9/1112:06 pm -
1 stop5h 16m
Deal found 8/19![Delta logo]()
$295
This United Airlines deal was found by Cheapflights users on 8/20. 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.
Fri 1/297:20 am -
Nonstop2h 07m
Mon 2/14:56 pm -
Nonstop2h 21m
Deal found 8/20![United Airlines logo]()
$289
This American Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 12/205:19 pm -
1 stop5h 40m
Mon 1/46:29 am -
1 stop5h 23m
Deal found 8/16![American Airlines logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 10/298:20 pm -
1 stop12h 12m
Sun 11/112:43 pm -
2 stops20h 51m
Deal found 8/16![Multiple Airlines logo]()
$322
This Southwest deal was found by Cheapflights users on 8/20. 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 9/107:05 pm -
Nonstop2h 15m
Mon 9/144:05 pm -
1 stop8h 10m
Deal found 8/20![Southwest logo]()
$267
This Delta deal was found by Cheapflights users on 8/20. 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 9/196:40 pm -
1 stop3h 32m
Mon 9/216:15 am -
1 stop3h 52m
Deal found 8/20![Delta logo]()
$297
This American Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 10/305:02 pm -
1 stop4h 50m
Sun 11/15:50 am -
1 stop6h 05m
Deal found 8/16![American Airlines logo]()
$319
This Southwest deal was found by Cheapflights users on 8/20. 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.
Tue 10/612:10 pm -
Nonstop2h 15m
Fri 10/96:25 am -
Nonstop2h 20m
Deal found 8/20![Southwest logo]()
$268
This Delta deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 10/304:26 pm -
1 stop7h 30m
Sun 11/17:13 am -
1 stop5h 13m
Deal found 8/16![Delta logo]()
$319
This Southwest deal was found by Cheapflights users on 8/19. 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.
Mon 10/57:50 pm -
Nonstop2h 20m
Fri 10/96:25 am -
Nonstop2h 20m
Deal found 8/19![Southwest logo]()
$268
This American Airlines deal was found by Cheapflights users on 8/18. 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.
Wed 9/21:46 pm -
1 stop5h 36m
Sat 9/57:37 pm -
1 stop5h 22m
Deal found 8/18![American Airlines logo]()
$349
This United Airlines deal was found by Cheapflights users on 8/19. 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.
Tue 10/66:32 am -
1 stop7h 11m
Sat 10/105:08 pm -
1 stop6h 30m
Deal found 8/19![United Airlines logo]()
$351
This Delta deal was found by Cheapflights users on 8/19. 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.
Wed 9/168:05 am -
1 stop5h 39m
Sun 9/206:15 am -
1 stop5h 22m
Deal found 8/19![Delta logo]()
$324
This Southwest deal was found by Cheapflights users on 8/20. 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.
Fri 9/116:45 pm -
Nonstop2h 00m
Mon 9/212:05 pm -
Nonstop2h 05m
Deal found 8/20![Southwest logo]()
$284
This United Airlines deal was found by Cheapflights users on 8/20. 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.
Sat 10/106:32 am -
1 stop4h 53m
Tue 10/136:10 am -
1 stop5h 02m
Deal found 8/20![United Airlines logo]()
$351
This American Airlines deal was found by Cheapflights users on 8/18. 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.
Wed 9/26:00 am -
2 stops8h 05m
Sun 9/65:55 pm -
1 stop7h 13m
Deal found 8/18![American Airlines logo]()
$354
This Delta deal was found by Cheapflights users on 8/19. 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.
Thu 10/226:30 am -
1 stop5h 51m
Sun 10/256:10 am -
1 stop5h 19m
Deal found 8/19![Delta logo]()
$324
This Southwest deal was found by Cheapflights users on 8/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/12:15 pm -
1 stop8h 10m
Thu 10/86:55 am -
Nonstop2h 05m
Deal found 8/17![Southwest logo]()
$287
This United Airlines deal was found by Cheapflights users on 8/17. 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.
Wed 11/186:30 am -
1 stop6h 47m
Sat 11/214:59 pm -
1 stop5h 23m
Deal found 8/17![United Airlines logo]()
$351
This American Airlines deal was found by Cheapflights users on 8/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/111:23 pm -
1 stop5h 00m
Sat 9/123:41 pm -
2 stops8h 56m
Deal found 8/20![American Airlines logo]()
$366
This Delta deal was found by Cheapflights users on 8/20. 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.
Tue 9/151:55 pm -
1 stop4h 24m
Tue 9/225:27 pm -
1 stop4h 03m
Deal found 8/20![Delta logo]()
$335
Last-minute flights from Illinois to PhiladelphiaDiscover last-minute flight deals from Illinois to Philadelphia. Data last updated August 21, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Philadelphia. Data last updated August 21, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/17. 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.
Mon 9/142:29 pm -
1 stop26h 45m
Mon 9/218:41 am -
1 stop5h 29m
Deal found 8/17![Frontier logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 8/19. 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.
Wed 9/162:29 pm -
1 stop7h 49m
Wed 9/238:41 am -
1 stop5h 29m
Deal found 8/19![Frontier logo]()
$157
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 9/177:25 am -
Nonstop2h 24m
Thu 9/2411:54 am -
Nonstop2h 36m
Deal found 8/17![Frontier logo]()
$163
This Super.com deal was found by Cheapflights users on 8/17. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/187:25 am -
Nonstop2h 24m
Mon 9/2111:54 am -
Nonstop2h 36m
Deal found 8/17![Frontier logo]()
$158
This Super.com deal was found by Cheapflights users on 8/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/187:25 am -
Nonstop2h 24m
Sun 9/2011:54 am -
Nonstop2h 36m
Deal found 8/18![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 8/19. 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.
Fri 9/252:29 pm -
1 stop15h 47m
Mon 9/288:41 am -
1 stop5h 29m
Deal found 8/19![Frontier logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 8/18. 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.
Fri 9/252:29 pm -
1 stop15h 47m
Mon 10/128:30 am -
1 stop10h 10m
Deal found 8/18![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 9/252:29 pm -
1 stop15h 47m
Tue 9/2912:40 pm -
1 stop25h 30m
Deal found 8/16![Frontier logo]()
$152
This CheapOair deal was found by Cheapflights users on 8/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/257:25 am -
Nonstop2h 24m
Mon 9/2811:54 am -
Nonstop2h 36m
Deal found 8/20![Frontier logo]()
$157
This Kiwi.com deal was found by Cheapflights users on 8/19. 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.
Mon 9/282:29 pm -
1 stop15h 47m
Tue 10/65:32 pm -
1 stop20h 38m
Deal found 8/19![Frontier logo]()
$146
This Kiwi.com deal was found by Cheapflights users on 8/18. 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.
Mon 9/282:29 pm -
1 stop15h 47m
Wed 9/308:41 am -
1 stop5h 29m
Deal found 8/18![Frontier logo]()
$147
This Trip.com deal was found by Cheapflights users on 8/19. 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.
Mon 9/287:25 am -
Nonstop2h 24m
Fri 10/211:54 am -
Nonstop2h 36m
Deal found 8/19![Frontier logo]()
$159
One-way flights from Illinois to PhiladelphiaSearch for one-way flight options from Illinois to Philadelphia. Find affordable one-way fares based on user searches. Data last updated August 21, 2026.
Search for one-way flight options from Illinois to Philadelphia. Find affordable one-way fares based on user searches. Data last updated August 21, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/19. 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.
Mon 9/212:29 pm -
1 stop15h 47m
Deal found 8/19![Frontier logo]()
$66
This Kiwi.com deal was found by Cheapflights users on 8/19. 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.
Mon 10/126:35 pm -
1 stop11h 46m
Deal found 8/19![Frontier logo]()
$67
This Kiwi.com deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 11/1610:35 am -
1 stop20h 01m
Deal found 8/16![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 8/19. 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.
Fri 10/166:35 pm -
1 stop11h 46m
Deal found 8/19![Frontier logo]()
$72
This Kiwi.com deal was found by Cheapflights users on 8/20. 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 9/182:29 pm -
1 stop15h 47m
Deal found 8/20![Frontier logo]()
$74
This Trip.com deal was found by Cheapflights users on 8/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1710:35 am -
1 stop6h 40m
Deal found 8/17![Frontier logo]()
$79
This Kiwi.com deal was found by Cheapflights users on 8/17. 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 9/162:29 pm -
1 stop7h 49m
Deal found 8/17![Frontier logo]()
$82
This CheapOair deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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.
Fri 9/116:25 am -
1 stop10h 49m
Deal found 8/16![Frontier logo]()
$118
This Super.com deal was found by Cheapflights users on 8/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/910:26 am -
1 stop6h 49m
Deal found 8/18![Frontier logo]()
$120
This Frontier deal was found by Cheapflights users on 8/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/124:41 pm -
Nonstop2h 23m
Deal found 8/17![Frontier logo]()
$121
This Frontier deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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 11/1912:03 pm -
1 stop5h 12m
Deal found 8/16![Frontier logo]()
$122
This Super.com deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” 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.
Sun 10/254:41 pm -
Nonstop2h 23m
Deal found 8/16![Frontier logo]()
$122
Find flight deals from Illinois to Philadelphia
Keep the following information in mind while searching for Illinois to Philadelphia flight deals. Data was last updated August 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $135 (Kiwi.com) |
One-way from | $66 (Kiwi.com) |
Popular in | June |
Cheapest in | October |
Average price | $266 |
Good round-trip deal | $253 or less |
Good one-way deal | $169 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to Philadelphia 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 7,457,451 searches. Data last updated August 21, 2026.
Use the filters below to find and compare flights from Illinois to Philadelphia that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisPhiladelphia
STL Lambert-St Louis - PHL Philadelphia
STLPHL
Lambert-St Louis
Tue 9/8
6:40 pm-9:55 pm
Nonstop2h 15m
Philadelphia
Thu 9/10
6:20 am-7:35 am
Nonstop2h 15m
$257
St. LouisPhiladelphia
STL Lambert-St Louis - PHL Philadelphia
STLPHL
Lambert-St Louis
Tue 10/27
6:40 pm-9:45 pm
Nonstop2h 05m
Philadelphia
Wed 10/28
6:25 am-7:45 am
Nonstop2h 20m
$257
St. LouisPhiladelphia
STL Lambert-St Louis - PHL Philadelphia
STLPHL
Lambert-St Louis
Mon 10/26
7:50 pm-11:10 pm
Nonstop2h 20m
Philadelphia
Mon 11/2
7:25 pm-9:00 pm
Nonstop2h 35m
$257
St. LouisPhiladelphia
STL Lambert-St Louis - PHL Philadelphia
STLPHL
Lambert-St Louis
Thu 9/10
7:05 pm-10:20 pm
Nonstop2h 15m
Philadelphia
Mon 9/14
4:05 pm-11:15 pm
1 stop8h 10m
$267
St. LouisPhiladelphia
STL Lambert-St Louis - PHL Philadelphia
STLPHL
Lambert-St Louis
Tue 10/6
12:10 pm-3:25 pm
Nonstop2h 15m
Philadelphia
Fri 10/9
6:25 am-7:45 am
Nonstop2h 20m
$268
St. LouisPhiladelphia
STL Lambert-St Louis - PHL Philadelphia
STLPHL
Lambert-St Louis
Mon 10/5
7:50 pm-11:10 pm
Nonstop2h 20m
Philadelphia
Fri 10/9
6:25 am-7:45 am
Nonstop2h 20m
$268
St. LouisPhiladelphia
STL Lambert-St Louis - PHL Philadelphia
STLPHL
Lambert-St Louis
Wed 12/9
10:14 am-4:35 pm
1 stop5h 21m
Philadelphia
Mon 12/14
5:25 pm-8:51 pm
1 stop4h 26m
$277
Quickest round-trip
ChicagoPhiladelphia
MDW Chicago Midway - PHL Philadelphia
MDWPHL
Chicago Midway
Fri 9/11
6:45 pm-9:45 pm
Nonstop2h 00m
Philadelphia
Mon 9/21
2:05 pm-3:10 pm
Nonstop2h 05m
$284
ChicagoPhiladelphia
ORD Chicago O'Hare Intl - PHL Philadelphia
ORDPHL
Chicago O'Hare Intl
Wed 9/16
6:13 pm-9:27 pm
Nonstop2h 14m
Philadelphia
Wed 9/23
7:40 pm-11:40 pm
1 stop5h 00m
$287
ChicagoPhiladelphia
ORD Chicago O'Hare Intl - PHL Philadelphia
ORDPHL
Chicago O'Hare Intl
Wed 9/23
11:15 am-6:54 pm
1 stop6h 39m
Philadelphia
Sat 9/26
6:55 pm-8:25 pm
Nonstop2h 30m
$287
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to Philadelphia
Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Illinois with our price prediction graph.
STL-PHL
ORD-PHL
MDW-PHL
BMI-PHL
MLI-PHL
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 Illinois to Philadelphia
USIL-PHL
STL-PHL
ORD-PHL
MDW-PHL
BMI-PHL
What is the cheapest month to book a flight from Illinois to Philadelphia?
Currently, October is the cheapest month in which you can book a flight from Illinois to Philadelphia (average of $199). Flying from Illinois to Philadelphia in March is currently the most expensive (average of $379). 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 IL to PHL?
Find hourly flight availability from Illinois to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 21, 2026.
When flying from Illinois to Philadelphia, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 28% versus a flight in the afternoon.
Weekly flight availability from Illinois to Philadelphia
Explore weekly flight availability from Illinois to Philadelphia. 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 August 21, 2026.
The most flights from USIL to PHL are scheduled on a Thursday (48 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (32 on average).
How much does it cost to fly round-trip from Illinois to Philadelphia?
Airfare is below average for this route at the moment.
Illinois to Philadelphia flights typically cost between $220 and $418 in October.The cheapest round-trip price found within the last 5 days was $157 on Frontier (Oct 8-Oct 11).
How far ahead should I book a flight from Illinois to Philadelphia?
Booking 35 days in advance of your planned departure date is, on average, the best time to get cheap flights from Illinois to Philadelphia. 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 Illinois to Philadelphia?
Use this chart to determine the cheapest time to fly round-trip from Illinois to Philadelphia. Price data was last updated on August 15, 2026.
Travelers seeking maximum savings on their Illinois to Philadelphia flight should consider departing on Thursday mornings 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.
Related info for your journey
Find useful and relevant information for your journey from Illinois to Philadelphia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Philadelphia?
Book flights to Philadelphia if you plan to visit one of these locationsWildwood
King of Prussia
Reading
Camden
Wildwood Crest
Ocean City
Cherry Hill
Lewes
Plymouth Meeting
Wyomissing
Pottstown
Ephrata
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Vineland
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Alternative routes for Illinois to Philadelphia
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Complete your trip
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Search flights from Illinois to Philadelphia by cabin class
Find flights from Illinois to Philadelphia, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Philadelphia flights
Browse other Illinois and Philadelphia flight options. Last updated on August 21, 2026.
Other flights to Philadelphia
Explore flights to Philadelphia departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 21, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Illinois to Philadelphia flights
Consider these flights traveling from Illinois to Philadelphia.
Top 5 airlines flying from Illinois to Philadelphia
Discover the top 5 airlines that operate flights from Illinois to Philadelphia. 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 7,457,451 searches. Data last updated August 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$67 | Average$160 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$168 | Average$408 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$168 | Average$391 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$209 | Average$382 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$248 | Average$405 | FlexibilityNo cancel fee | On-timeN/A |