When making the journey from Heathrow airport to Gatwick airport, you have three different transfer options; taxi, train or bus. Taking a taxi from Heathrow airport is by far the quickest option as it takes only 45 minutes. Taking the National Express bus is a great low-budget option. The least convenient option to travel from Gatwick to Heathrow is to take the train as there are no direct lines and the journey can take up to 1 hour and 52 minutes. Welcome Pickups offers meet and greet services and a friendly introduction to London at the same price as a regular taxi. Click here to see the cost.