The chasm wasn't wide enough for the Balrog to be able to take flight or fly in, neither were the caverns of Moria. It says in FotR that the wings spanned from wall to wall. In the Silmarillion it says of the Balrogs when they were called to aid Morgoth fend off Ungoliant when they returned from Valinor and the destruction of the trees:
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And the arose and passed over Hithlum.
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*~*Call me a relic, call me what you will.
Say I'm old fashioned , say I'm over the hill.
That old whine ain't got no soul.
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