Starwars.com has a breakdown of the airing schedule for the first 9 episodes.
They will be airing episodes back-to-back from October 16th-November 13th followed by a holiday break and will return in January 2018.
Monday, 10/16 – “Heroes of Mandalore” Parts 1 & 2
Monday, 10/23 – “In the Name of the Rebellion” Parts 1 & 2
Monday, 10/30 – “The Occupation” and “Flight of the Defender”
Monday, 11/6 – “Kindred” and “Crawler Commandeers”
Monday, 11/13 – “Rebel Assault”
Six episodes will presumably air in 2018 leading up to the series finale.
Star Wars Rebels Season 4 will air on various time slots each Monday including 9:30 a.m., 3:00 a.m., 7:30 a.m., 5:30 p.m., and 9:00 p.m. ET on Disney XD, the Disney App, and VOD, per Lucasfilm.