I'm trying to figure out the best way to get to Heathrow T4 in time for a 9 AM flight on a Saturday morning to the US (Delta) using public transportation. Our hotel is in the Swiss Cottage area, specifically the Finchley Road underground stop. We have no status, so we can't make use of any priority security or checkin lines at the airport.

We need to be at LHR a couple hours before departure, maybe 2.5-3 just to be safe. I think taking the underground straight to T4 might be cutting it a bit too close for comfort. Heathrow Connect is probably fine, and Heathrow Express is definitely fine. I think Connect will be OK, it's the most economical option, however, I would like advice from someone more familiar with London. Thanks