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United Airlines have roundtrip airfares travelling from Chicago (ORD) to Houston (IAH) for $ 86 including taxes and fees. This is nonstop. This works in reverse too but the first available date that is available for departure from IAH is April 26 and only two return dates.

Travel Availabiity:
Departs ORD: April 19, 25, 26; May 2, 3
Departs IAH: April 26; May 2, 3, 9, 10, 16

Use dates and book it on Expedia [expedia.com], United Airlines [united.com] or Orbitz [orbitz.com].