Chicago O’Hare’s entire airport complex is reported at over 7,200 acres, while newer airport references also list it at about 7,627 acres; the passenger terminals themselves are part of that total, but the airport sources I found do not break out terminal acreage separately.

What that means

  • O’Hare has four passenger terminals: 1, 2, 3, and 5.
  • The acreage figures refer to the whole airport property, not just the terminals.
  • So if you mean “how big are the terminals combined,” the public sources here don’t give a clean terminal-only acre total.

Practical answer

For a quick estimate, it’s safest to say: Chicago O’Hare is about 7,200 to 7,627 acres total , with the terminals occupying only a portion of that land.