The present disclosure discloses a method and network device for enforcing uplink airtime fairness in wireless local area networks. The disclosed network device receives usage limits associated with transmissions from one or more client devices. The client devices transmit packets to the network device via one or more uplink wireless mediums. The disclosed network device further collects wireless medium usage times associated with the client devices, and calculates a size for transmission windows corresponding to the client devices based on the wireless medium usage times and the usage limits. The transmission windows can be TCP advertisement windows whose size determines a rate of transmissions permitted over the wireless medium. Then, the disclosed network device sets the transmission window to the calculated size.