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Chicago to Philadelphia (& vice versa) for only $66 roundtrip

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Cheap non-stop flights from Chicago to Philadelphia for only $66 roundtrip with United Airlines.

Also works in reverse.

DEPART:
Chicago, USA

ARRIVE:
Philadelphia, USA

RETURN:
Chicago, USA

DATES:
Availability from May to June 2016

Example dates:

Chicago – Philadelphia – Chicago
4th-10th May
4th-11th May
6th-10th May
6th-11th May
7th-10th May
7th-11th May
9th-11th May
9th-12th May
9th-18th May
11th-18th May
25th May – 2nd Jun
25th May – 3rd Jun
3rd-7th Jun
3rd-8th Jun

Philadelphia – Chicago – Philadelphia
3rd-6th May
3rd-7th May
3rd-9th May
3rd-11th May
4th-6th May
4th-7th May
4th-9th May
18th-25th May
20th-25th May
29th May – 3rd Jun

and more…

STOPS:

AIRLINE
United Airlines

Complete the search box with the example dates listed above: