Exhibit 16.1

Ernst & Young LLP

Suite 501

5417 Pinnacle Point Drive

Rogers, AR 72758

Tel: +1 479 254 6300

Fax: +1 479 254 6304

ey.com

Securities and Exchange Commission

100 F Street, N.E.

Washington, DC 20549

Commissioners:

We have read Item 4.01 of Form 8-K dated March 7, 2025, of ArcBest Corporation and are in agreement with the statements contained in the first, second and third paragraphs under (a) Dismissal of Independent Registered Public Accounting Firm therein. We have no basis to agree or disagree with other statements of the registrant contained therein.

/s/ Ernst & Young LLP

March 7, 2025