EXHIBIT 5


December 23, 1997


LCI International, Inc.
8180 Greensboro Drive
McLean, Virginia  22102

Ladies and Gentlemen:

          I am the Vice  President  and  General  Counsel of LCI  International,
Inc., a Delaware  corporation (the "Company"),  and have acted as counsel to the
Company  in  connection  with  its  Registration  Statement  on  Form  S-8  (the
"Registration  Statement")  filed  pursuant to the  Securities  Act of 1933,  as
amended,  relating  to the  registration  of  1,761,146  additional  shares (the
"Shares") of the Company's  Common Stock,  par value $.01 per share (the "Common
Stock") which may be issued under the USLD  Communications  Corp.  1990 Employee
Stock Option Plan, the USLD Communications Corp. 1993 Non-Employee Director Plan
and the USLD Communications Corp. 401(K) Retirement Plan (the "Plans").

          For purposes of the opinions expressed in this letter, I have examined
the  Certificate  of  Incorporation  and By-laws of the Company,  records of the
corporate  proceedings of the Company,  and such other  documents and records of
the  Company  as I have  deemed  necessary  or  appropriate  as a basis for such
opinions.  In making my  examination,  I have  assumed  the  genuineness  of all
signatures,  the legal  capacity of natural  persons,  the  authenticity  of all
documents  submitted to me as originals  and the  conformity to the originals of
all documents submitted to me as photostatic or conformed copies.

          I am a member of the Bar of the  Virginia  and,  for  purposes  of the
opinions  expressed in this letter,  do not hold myself out as expert on, nor am
I, in  rendering  the  opinions  expressed  herein,  passing  on the laws of any
jurisdiction  other than the federal laws of the United States,  the laws of the
Commonwealth  of  Virginia  and the  General  Corporation  Law of the  State  of
Delaware.

          Based on the foregoing, and having regard to such legal considerations
as I have deemed  relevant,  I am of the opinion  that the Shares have been duly
authorized  and,  upon the issuance  thereof and payment  therefor in accordance
with the terms of the applicable  Plan, will be validly  issued,  fully paid and
nonassessable.

          I hereby  consent to the inclusion of this letter as an exhibit to the
Registration Statement.

                              Very truly yours,


                              /s/ LEE M. WEINER
                              -----------------
                              Lee M. Weiner