New Sound Transit bus fares, one of them affecting seniors, will start taking effect in July.

The transit agency’s board, in action taken in April, approved phasing-in changes to ST Express Fares. On July 1, bus commuters with an ORCA Lift or Youth pass will see a flat $1.50 fare, while senior or disabled passholders will pay a flat $1 fare.

Another change is two years away. On July 1, 2020, adult riders will pay a flat fare of $3.25 on all ST Express bus routes. The new fare eliminates the previous two-zone fare system in favor of one fare throughout the ST Express service area, officials said.

Additional information, including schedules and transit center locations, is available at soundtransit.org.