Buy one, get one free


511 Contra Costa renewed their popular two-for-one 20-Ride Pass offer, which is valid on all Tri Delta Transit routes including Commuter Route 300X!

Purchase one $33 20-Ride General Public Pass and get one $33 20-Ride General Public Pass FREE OR purchase one $17 20-Ride Senior/Disabled Pass and get one $17 20-Ride Senior/Disabled Pass FREE. The offer is open to anyone who uses the bus as part of their work commute. Limit one "Buy One, Get One FREE 20 ride pass coupon" offer per person and per household during promotion period of July 1 through June 30 each incentive year while funding is available.

To apply for the "Buy One, Get One" offer:

If downloading the application from our website or

  • Email completed application for the first 20-ride pass to
  • Mail the application to
    Tri Delta Transit
    801 Wilbur Avenue
    Antioch, CA 94509.

Your application and payment will be processed. Your first pass will be mailed to you. If we received approval before your pass is mailed, you may receive your BOGO too.

Note: Completion of the application does not guarantee delivery of a second/free pass. Only applicants approved by 511 Contra Costa will be sent a free pass. For more information on this program, visit the 511 Contra Costa webpage.

Information on this website can be provided to you in a variety of accessible formats in addition to the translation feature, such as diskette/CD, audio tape, braille, or large print. If you need any written information provided to you in one of these accessible formats, please contact us at 1-925-754-6622 and ask for the Customer Service Department.