A method for controlling a packet transfer through a multipath session is disclosed. The method comprises a number of n paths linking a first endpoint to a second endpoint, n being an integer greater or equal to 2, i being an integer and 1≦i≦n; each path Pi being defined by a couple of addresses of a communication interface of the first and second endpoint; the first endpoint being configured for sending the packet to the second endpoint through anyone of the paths; the second endpoint being configured for sending an acknowledgment message through anyone of the paths when the second endpoint received a packet. According to the invention, the method involves, at the first endpoint and at a time t, steps of: assessing a load distribution L through the path Pi based on evaluations of a round-trip-time RTT over the path Pi for every i between 1 and n; evaluating a current available load distribution R from the data load distribution L , from an aggregated size of packets D currently assigned to be transmitted on the path Pi for every i between 1 and N, and from the aggregated size of packets D currently assigned to be transmitted on any of the paths; selecting a path Pi among the from the current available load distribution R ; sending the packet on the selected path such that the aggregated size of packets D to transmit through the selected path Pi is lower than a congestion window cwnd whose value is evaluated globally by the first endpoint for the multipath session. A device for controlling a transfer of a packet through a multipath session implementing the method is further disclosed.