The Société de Transport de l'Outaouais provides service to the city of Gatineau, as well as the municipalities of Chelsea and Cantley in the MRC-des-Collines. Many routes travel to downtown Ottawa, where transfers can be made to OC Transpo. 
Fare Structure (Effective January 2011)
|  | Regular | Express | Interzone | 
| Cash | $3.40 | $3.90 | $5.90 | 
| Tickets (Adult) | $2.95 | 1 Ticket + $0.50 ($3.45) | 2 Tickets ($5.90) | 
| Tickets (Student/Senior) | $2.20 | 1 Ticket + $0.50 ($2.70) | 2 Tickets ($4.40) | 
| Transfer Supplements | N/A | $0.50 | Any of the following: One Ticket$2.95 Adult$2.20 Student/Senior
 | 
| Monthly Pass (Adult) | $79.00 | $94.50 | $105.50 | 
| Monthly Pass (Student) | $54.00 | $66.50 | $80.00 | 
| ZAP Monthly Pass* | $15.00 | N/A | N/A | 
| Senior Monthly Pass | $35.50 | 
| Smart Card | $8.00 | 
- The ZAP pass is only available to those 16 and under. It allows riders to ride the network after 6PM, or anytime on weekends and holidays.
- Although often ignored by STO drivers and ticket sellers, a student smart card is required to take advantage of reduced ticket fares.
Transfers
- Transfers and passes can be used on the OC Transpo system, and vice-versa.
- Transferring to an STO express bus requires a supplement of $0.50, and transferring to an interzone bus requires a supplement of a ticket, or the equivalent cash amount.
Routes
Regular
| No. | Signed | Starts | Ends | Remarks | 
| 21 | MUSEE DES CIVILISATION / OTTAWAST-JOSEPH / FREEMANCASINO DU LAC LEAMY
 | Freeman Park-and-RideCasino du Lac-Leamy
 | Casino du Lac-LeamyOttawa via Alexandra
 | Weekday evening service reduced on MondaysOnly route that travels in the downtown core outside of Wellington/Rideau. It is routed to provide easy access to downtown-area hotels.
 | 
Rush
| No. | Signed As | Starts | Ends | Remarks | 
| 01 | CHELSEAOTTAWA VIA PORTAGE
 | Eglise St-Clément du Farm Point | Ottawa |  | 
| 05 | CANTLEYOTTAWA VIA PORTAGE
 | Ch. des Érables / Dupéré | Ottawa |  | 
| 06 | CANTLEYOTTAWA VIA PORTAGE
 | HWY-307 / Mont-Cascades | Ottawa |  | 
Express
| No. | Signed As | Starts | Ends | Remarks | 
| 11 | EXPRESS PARC DE LA MONTAGNEEXPRESS OTTAWA
 | CEGEP Gabrielle-Roy | Ottawa | Crosses into Ottawa via Macdonald-Cartier bridge.
 | 
| 17 | EXPRESS ST-JOSEPHEXPRESS OTTAWA
 | CEGEP Gabrielle-Roy | Ottawa | Crosses into Ottawa via Macdonald-Cartier bridge.
 | 
| 80 | EXPRESS CANNES / ARENA BEAUDRYEXPRESS OTTAWA
 | Beaudry Arena | Ottawa | Provides express service to the Touraine area of Gatineau.
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 InterzoneCurrent Fleet Roster |