Five contracted Toronto Transit Commission (TTC) bus routes run within York Region's boundaries (one in Vaughan and four in Markham).

Some YRT routes operate within the City of Toronto; these buses generally run to and from TTC subway stations.

As the majority of passengers are assumed to be transferring to and from TTC services, no extra fare is charged for riders boarding or disembarking YRT buses within Toronto.

In the fourth quarter of 2022, average weekday ridership was approximately 64,800 on buses and 1,200 on MobilityPlus, a service for people with disabilities.

[5] Stagecoaches or omnibuses ran along Yonge Street to hotels in Richmond Hill from York (now Toronto) beginning in the 1820s.

[5] Like Newmarket, Aurora was much smaller in size and population than other southern York Region municipalities, which benefited from connections to GO Transit and the TTC.

Passengers travelling to the neighbouring Oak Ridges or Newmarket could still use Aurora Transit tickets with a cash supplement.

Transit services in York Region are divided into four divisions and are provided by private operators under contract.

[15] In 2015, TOK Transit began a seven-year contract, replacing Veolia Transportation (Transdev) as operator.

[14] The North Division includes several bus routes in Newmarket, Aurora, King Township, East Gwillimbury and Georgina.

Customers can also pay the equivalent of the YRT adult cash fare prices via contactless credit or debit card.

[17] As of 1 July 2024[update], YRT fares are as follows: [18] Other fares: Two separate methods of payments are used by transit routes serving York Region: York Region's rapid transit bus service, Viva, operates on a "pre-paid proof-of-payment (POP)" system, meaning passengers in possession of POP can board these buses at any door.

Time-based fares and transfers allow for unlimited travel within York Region on a single fare for two hours, including transfers to and from Brampton Transit, Züm, as well as TTC-operated bus routes in York Region (north of Steeles Avenue).

This allows passengers to board a TTC bus in York Region and disembark in the City of Toronto and vice versa.

Since August 26, 2019, riders have been able to use their Presto card to pay both their YRT and TTC fares on TTC-operated bus routes that travel between York Region and Toronto.

[25] While single-use TTC-only paper Presto tickets can be used to pay a TTC fare for the subway (whether in York Region or Toronto) or TTC surface routes in Toronto, they cannot be used to pay a YRT fare on YRT- and TTC-operated bus routes in York Region.

[26] Under the fare integration policy, riders using card payment can transfer between YRT and TTC services in Toronto within two hours of initial payment, with the additional fare for cash payment still required when transferring between YRT bus routes and the subway at these stations, as it is at stations located in or bordering Toronto, such as Finch or Pioneer Village as well as with connecting TTC bus routes operating in Toronto.

The introduction of Züm Queen has ended operation of YRT route 77 to Bramalea City Centre.

The acceptance of YRT fares on Brampton Transit routes in York Region are the last vestiges of such cooperation.

[1] The initial fleet consisted of buses from previous York Region operators, but has since been expanded with YRT-bought vehicles.

During the agency's early years, many buses still sported the pre-2000 colours of their previous operators, with "YRT" painted on the front and sides.

They do random spot checks on board Viva buses to ensure the proper use of tickets, transfers and Presto cards.