06 September 2025

Heathrow Express - How Much Does it Really Cost?

Heathrow Express is the train service from Heathrow T5 via T123 non stop to London Paddington.  If you're coming from T4 you need to change at T123.  With a journey time of around 15 minutes from T123 to Paddington it has historically been the most expensive train in Britain.

But with competition from Crossrail / Elizabeth Line, HEX is trying to broaden its appeal with £10 fares for 30 day advance bookings.

However if you've not got your travel plans nailed down 30 days in advance - how much will it really cost?

If you're travelling today or in the next three days you will be charged a whopping £25


But that drops to a marginally less eye watering £22 from day 4 to day 20


From day 21 to day 29 you will be paying a still unreasonable £18.50 for the 15 minute journey


And then the 46% price drop kicks in from 29 days to 30 days before departure.


Is this the biggest cliff edge in British train pricing?

In comparison Stansted Express takes 90 days to get down to their lowest price - using six different price points, with their biggest drop happening at the start of the slide.

Unlike the Stansted Express, HEX does recognise most Railcards (apart from the popular Network Railcard).


Other Transport Options

The Elizabeth Line costs £12.80 to Paddington station or £13.90 to other Zone1 stations.

Liz Line trains continue through Paddington into central London - avoiding a long walk in the station if you're changing from HEX to a tube or train and continuing your journey.

Whilst the whole of the Elizabeth Line accepts contactless payments - if you have a Railcard and are only using the Liz Line you are better off buying a paper or digital ticket.  Remembering that with the Network Railcard a minimum fare applies on weekdays.


And of course the Piccadilly Line is even cheaper with a standard fare of £5.80 from Heathrow to Zone 1 - with a saving of up to £2.20 if you're prepared to do the Hatton Cross hack!

Conclusion

If your travel is nailed down over 30 days in advance, and Paddington is convenient for you, then maybe the £10 Heathrow Express fare will be attractive.

But for everybody else, HEX is unlikely to be a competitive option - despite what their ticket touts dominating Heathrow arrivals would have you believe!


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