EXHIBIT 99.1 JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1)(iii) of the Securities Exchange Act of 1934, each of the undersigned agrees that a single joint Schedule 13G/A and any further amendments thereto may be filed on behalf of each of the undersigned with respect to the common units held by each of them in Westlake Chemical Partners LP.

Dated:    January 20, 2023

WPT LLC

By: /s/ ALBERT CHAO

Name: Albert Chao

Title: President

WESTLAKE POLYMERS LLC

By: /s/ ALBERT CHAO

Name: Albert Chao

Title: President

WESTLAKE CHEMICAL INVESTMENTS, INC.

By: /s/ ALBERT CHAO

Name: Albert Chao

Title: President

WESTLAKE OLEFINS LLC

By: /s/ ALBERT CHAO

Name: Albert Chao

Title: President

WESTLAKE VINYLS, INC.

By: /s/ ALBERT CHAO

Name: Albert Chao

Title: President

WESTLAKE VINYL CORPORATION

By: /s/ ALBERT CHAO

Name: Albert Chao

Title: President

WESTLAKE LONGVIEW CORPORATION

By: /s/ ALBERT CHAO

Name: Albert Chao

Title: President

WESTLAKE CORPORATION

By: /s/ ALBERT CHAO

Name: Albert Chao

Title: President and CEO

[Signature Page—Schedule 13G Joint Filing Agreement]