Plans for a third runway at Heathrow Airport have raised questions about how best to accommodate a projected increase of 100,000 to 200,000 daily passengers and staff traveling to and from the airport. Alongside complex infrastructure challenges such as relocating the M25 motorway to make space for the new 2.2-mile runway, transport authorities are focusing on how to expand sustainable rail options to manage the growth.
Currently, the Heathrow Express offers the fastest direct connection between the airport and central London, running from terminals to Paddington Station in 15 to 21 minutes. However, its high fare—around £26 per trip—has led some stakeholders to question its value, especially compared to alternatives like the Elizabeth line and London Underground, which provide slower but more affordable and arguably more convenient services for many passengers.
Transport for London (TfL) is reviewing the future of the Heathrow Express amid broader efforts to optimise capacity on the Great Western main line. The organisation suggests that the Elizabeth line, which extends deeper into the City and Canary Wharf, could better serve travellers with increased frequency and lower costs. At present, the Elizabeth line runs only two trains per hour to Heathrow Terminal 5—home to British Airways and responsible for about 40% of the airport’s passenger traffic—resulting in potential wait times of over an hour for some passengers seeking a direct route from central London locations.
TfL expects to double the frequency of Elizabeth line services to Terminal 5 next year but indicates that more could be done to free up rail capacity to accommodate Heathrow’s expansion. Alex Williams, TfL’s chief customer and strategy officer, described the Heathrow Express as an underutilised service occupying valuable rail slots that could be better allocated.
Meanwhile, political support for Heathrow’s third runway appears mixed. Some figures, such as Andy Burnham, have expressed long-term scepticism about expansion, and the departure of Rachel Reeves from government has contributed to uncertainty at the national level. This ambivalence extends to Downing Street, where backing for the project remains cautious.
As Heathrow prepares for substantial passenger growth, transport experts and officials face the challenge of balancing speed, cost, and rail network capacity. The future role of the Heathrow Express, traditionally a premium but limited service, remains under consideration as authorities seek to integrate more cost-effective, sustainable options to meet the demands of the airport’s expansion.