[1][5] During its founding, WMATA dropped transfer charges, extended senior citizen discounts region-wide and began fare reductions on routes formerly served by the different carriers at different rates.

As of June 30, 2024[update], the Metrobus fare structure is as follows for cash and SmarTrip:[7] The 5A and B30 Airport Express routes were $7.50 before their discontinuation.

[10] The District has continued to delayed its fare-free service due to its inability to fund the program and opposition from D.C. Mayor Muriel Bowser, Maryland, and Virginia.

[13] In 2020, WMATA received $4.1 million in funding from the Federal Transit Administration for the purchase of electric buses and charging infrastructure.

A Sierra Club report indicated that a pilot study with 14 electric buses was planned, and estimated that 50% electrification would reduce the WMATA fleet's greenhouse gas (GHG) emissions by more than 58,000 tons of carbon dioxide (CO2) per year.

"REX", is a Limited-Stop bus line that operates between King Street–Old Town station and Fort Belvoir along the Richmond Highway corridor in Fairfax County, Virginia.

REX began service on September 26, 2004, replacing parts of the now-former route 9A (which operated between Huntington and Pentagon stations until it was eliminated on June 26, 2016).

The second REX fleet consisted of 12 now-retired 2006 Orion 07.501 (VII) CNG buses (2674–2685) painted in the blue-and-gold color scheme until they were all repainted between June and August 2014.

The original Metroway fleet consisted of thirteen 2014 NABI 42 BRT diesel-electric hybrid buses (8002–8014) until they were all repainted in December 2016.