Hello. I have an upcoming flight (YVR-SEA-LHR-SEA-YVR) and as I live in Seattle and don't need to go back to Vancouver anymore (I'll be in Vancouver at the start), I was wondering about the possibility of only flying the LHR-SEA on the last leg. Would I be able to just drop that final SEA-YVR flight, by either letting VS know prior to the LHR flight, trying to drop it after the LHR flight, or is it not possible to do that.

Any insight into dropping that last leg without jeopardizing the whole ticket as it was a great price would be welcome!