Exhibit 99.1 Saia Reports First Quarter Results JOHNS CREEK, GA – April 25, 2025 – Saia, Inc. (Nasdaq: SAIA), a leading transportation provider offering national less-than-truckload (LTL), non-asset truckload, expedited and logistics services, today reported first quarter 2025 financial results. Diluted earnings per share for the quarter were $1.86 compared to$3.38 in the first quarter of 2024. Highlights from the first quarter operating results were as follows: First Quarter 2025 Compared to First Quarter ...