Par Investment Partners Owns More Than A Third Of Trivago N.v.

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Page 9 of 20 – SEC Filing

Exhibit 99.1

Joint Filing Agreement

The undersigned
acknowledge and agree that the foregoing statement on Schedule 13D is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf of each of the undersigned without the
necessity of filing additional joint filing statements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him, her or it contained
herein, but shall not be responsible for the completeness and accuracy of the information concerning the other entities or persons, except to the extent that he, she or it knows or has reason to believe that such information is inaccurate.

In evidence whereof, each of the undersigned, being duly authorized, has executed this Joint Filing Agreement as of September 18, 2018.

PAR INVESTMENT PARTNERS, L.P.
By: PAR Group II, L.P., its General Partner
By: PAR Capital Management, Inc., its General Partner
By:

/s/ Steven M. Smith

Name: Steven M. Smith
Title: Chief Operating Officer and General Counsel
PAR GROUP II, L.P.
By:

PAR Capital Management, Inc., its

General
Partner

By:

/s/ Steven M. Smith

Name: Steven M. Smith
Title: Chief Operating Officer and General Counsel
PAR CAPITAL MANAGEMENT, INC.
By:

/s/ Steven M. Smith

Name: Steven M. Smith
Title: Chief Operating Officer and General Counsel

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