The average train between Kings Cross and Heathrow Terminal 3 takes 33 min and the fastest train takes 28 min. The train runs at least 3 times per hour from Kings Cross to Heathrow Terminal 3. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.
Trains run every 20 minutes between Kings Cross and Heathrow Terminal 3. The earliest departure is at 8:06 AM in the morning, and the last departure from Kings Cross is at 8:26 PM which arrives into Heathrow Terminal 3 at 8:54 PM. All services require a transfer at Paddington and take an average of 33 min. The schedules shown below are for the next available departures.

33 min • 1 change

32 min • 1 change

33 min • 1 change

34 min • 1 change
Want to know about travelling from Kings Cross to Heathrow Terminal 3? We have put together a list of the most frequently asked questions from our users such as: What is the cheapest mode of transport? What is the quickest option? How much do tickets usually cost? and many more.
No, there is no direct train from Kings Cross to Heathrow Terminal 3. However, there are services departing from Kings Cross station and arriving at Heathrow Terminal 3 station via Paddington. The journey, including transfers, takes approximately 33 min.
Kings Cross to Heathrow Terminal 3 train services, operated by London Underground (Tube), depart from King's Cross St. Pancras station.
Kings Cross to Heathrow Terminal 3 train services, operated by London Underground (Tube), arrive at Heathrow Terminals 2 & 3 station.
Book your Kings Cross to Heathrow Terminal 3 train tickets online with London Underground (Tube) and Heathrow Express.
The distance between Kings Cross and Heathrow Terminal 3 is 24 km. The road distance is 27 km.
London Underground (Tube) operates a subway from King's Cross St. Pancras station to Heathrow Terminals 1-2-3 station every 10 minutes. Tickets cost £15–60 and the journey takes 56 min.