The present invention relates to a method, performed by a terminal supporting bundling of a plurality of transmission time intervals (TTIs), for transmitting vehicle-to-X (V2X) data in a wireless communication system, the method comprising: transmitting scheduling information related to transmission of the V2X data; and transmitting the V2X data through bundling of the plurality of the TTIs, wherein, when there is a change in the plurality of bundled TTIs, the terminal transmits the scheduling information which further includes information related to the change.