The Elizabeth line to Heathrow was hit by a run of power supply failures in mid-August 2026. On 13 August, there was no service at all between Paddington and Reading or Heathrow Terminals, with severe delays continuing between Abbey Wood and Paddington. On 14 August, a further power supply failure at Maidenhead caused severe delays between Paddington and Heathrow Terminals and Reading. Knock-on disruption continued into the evening of the 14th before the line returned to a good service by the morning of 15 August.
During the disruption, passengers were advised to use the Piccadilly line between Heathrow and central London instead, with Elizabeth line tickets accepted on London Underground, buses and other rail services for the duration.
A single power fault on the Elizabeth line can take out the direct rail link to Heathrow for hours, and it isn't a one-off — the same stretch of line has had repeat issues through 2026. If you're travelling to or from Heathrow by rail, it's worth knowing the alternatives before you need them, not while you're standing on a platform watching your service get cancelled.
Your options if the Elizabeth line is down
| Option | Typical journey time (central London–Heathrow) | Typical single fare | Notes |
|---|---|---|---|
| Piccadilly line | About 50 minutes | £5.90 (contactless/Oyster, zone 1 to Heathrow) | Runs to all Heathrow terminals; the standard fallback when the Elizabeth line is disrupted |
| Heathrow Express | About 15 minutes | From £10 booked 30+ days ahead, £26 on the day | Fastest option, but a walk-up fare on the day of disruption costs considerably more than the Tube |
| National Express coach | Varies by route, typically over an hour | Booked in advance, price varies | Useful if you're coming from outside central London rather than from a Tube station |
| Taxi or pre-booked transfer | Door to door, no transfers | Fixed price if pre-booked | The only option that doesn't depend on any rail line at all — worth having as a backup for an early flight or tight connection |
The Piccadilly line and Elizabeth line charge the same TfL pay-as-you-go fare for the same zones, so switching between them during a disruption doesn't cost you anything extra if you're using contactless or Oyster. The Heathrow Express is the quickest way to recover lost time, but only makes financial sense if you book ahead — the walk-up fare on the day is roughly two-and-a-half times the advance price.
If you have an early flight or a tight connection
Rail disruption is hardest to absorb on an early-morning flight, when there's no slack left in your schedule and alternative services may not even be running yet. If your flight is before about 07:00 and you're relying on rail, build in a backup plan — whether that's an earlier train than you think you need, or a pre-booked taxi you can fall back on if the first option falls through — rather than finding out about a power fault after you're already committed to one route.
FAQs
Will my Elizabeth line ticket work on the Piccadilly line during a disruption?
During the August 2026 disruption, TfL accepted Elizabeth line tickets on London Underground, buses and other rail services for the affected period. This is standard practice during major disruptions, but always check TfL's live status page for the specific terms in force at the time.
Is this a regular problem on the Elizabeth line to Heathrow?
The line has had repeat power supply and signalling issues on the Heathrow branch through 2026, so while any single incident is unpredictable, treating rail disruption as a real possibility rather than a rare fluke is the safer assumption for time-sensitive journeys.
What's the cheapest way to get to Heathrow if the trains are down?
The Piccadilly line, at the same fare as the Elizabeth line for the same zones, is normally the cheapest working alternative. A pre-booked taxi costs more but removes your dependency on any rail line entirely, which matters more the tighter your connection is.