Heathrow Express has launched a new discounted advance single fare as part of its new ticket pricing structure.
The £6.99 single fare and £11.90 for a return is for advanced bookings made between three and six months in advance.
It is part of a brand new range of advanced purchase ticket fares which Heathrow Express are trialling.
It compares to £21.50 for an Express Saver single and £35 for an Express Saver return bought from a ticket machine on the day of travel.
Singles bought seven days in advance are £16.10 and 30 days in advance £10.75.
Fraser Brown, director of Heathrow Express said: "Many travellers flying in and out of Heathrow have booked flights well in advance, so it makes sense to book your airport transfer at the same time as your flights for the maximum saving."
Advance tickets are valid only on the date shown on the ticket and are non-refundable and availability is limited at certain times.
