A technical failure in the UK's air traffic control system on Tuesday 8 September 2026 grounded and delayed flights across Britain, and two Singapore Airlines flights out of Changi never made it to London.
> Quick view: SQ308 (Airbus A380-800, 401 passengers) was diverted to Paris Charles de Gaulle, and SQ318 (Boeing 777-300ER, 203 passengers) to Munich. The return flights SQ319 and SQ321 out of Heathrow were cancelled. The NATS system fault itself was fixed at 7.30pm UK time on 8 September, but Heathrow says knock-on disruption continues on 9 September. One thing most readers will not know: because of how UK passenger rules are written, your Singapore to London flight and your London to Singapore flight are not covered the same way.
What actually broke
The UK's National Air Traffic Services (NATS) handles air traffic control for British airspace. Its own statements, timestamped on its news page, set out the sequence:
| UK time | NATS statement |
|---|---|
| 8 Sep, 3.25pm | "We have identified that the issue was in our flight processing system." |
| 8 Sep, 7.30pm | "Our system issue is now resolved, we are operating normally and working as hard as possible to clear the backlog of flights." |
| 8 Sep, 10.10pm | "Work is continuing to assist airlines and airports recover from today's disruption. This has been a very complex recovery and has created difficulties for the whole aviation network." |
| 9 Sep, 12.55pm | "Our operations are stable and we continue to work closely with airlines and airports to support their recovery from the ongoing disruption to their operations." |
The scale is what makes this worth reading about from Singapore. Around 1,300 flights to and from the UK were cancelled on Tuesday, and more than 150 more on Wednesday, most of them at Heathrow.
The two Singapore flights that were diverted
Singapore Airlines confirmed the affected flights to CNA on Wednesday.
| Flight | Aircraft | On board | Diverted to | Landed (local) |
|---|---|---|---|---|
| SQ308, Singapore to London Heathrow | Airbus A380-800 | 401 passengers, 29 crew | Paris Charles de Gaulle | 6.28pm |
| SQ318, Singapore to London Heathrow | Boeing 777-300ER | 203 passengers, 19 crew | Munich | 8.09pm |
SQ308's passengers were transferred to London by land from Paris. For SQ318, SIA said it planned to operate the aircraft from Munich to Heathrow "once the necessary clearances have been received".
On the return leg, SQ319 and SQ321, both scheduled to depart Heathrow on Tuesday, were cancelled outright.
SIA said it gave affected customers hotel accommodation and ground transport, and rebooked connecting flights where needed. Its advice is to check the flight status page on singaporeair.com rather than rely on an older notification.
Where things stand today
Heathrow's own notice, posted on 9 September, is the clearest read on what to expect:
> "Flights are operating today, however some knock-on disruption is expected as airlines reposition aircraft and crew. Passengers are advised to check the latest status of their flight directly with their airline and to only travel to Heathrow if their flight is confirmed as operating today."
That last clause matters. An aircraft that spent Tuesday night in Munich or Paris is not where the Wednesday and Thursday schedules assumed it would be, and crew duty limits move with it. Delays roll forward for days after an event like this, not hours.
The compensation rule almost nobody gets right
This is where Singapore passengers get caught out, so it is worth being precise. UK passenger rights (the UK's retained version of EU261) cover:
- Any flight departing a UK airport, on any airline. A London to Singapore SIA flight is covered.
- Flights arriving in the UK only if the airline is a UK or EU carrier. Singapore Airlines is neither, so a Singapore to London SIA flight is not covered by these rules at all.
So SQ308 and SQ318, the two diverted flights, sit outside the UK regime. The cancelled SQ319 and SQ321, which were leaving Heathrow, sit inside it.
Then a second filter applies to the flights that are covered. There are two different things people lump together as "compensation":
1. Refund, rerouting and duty of care. You get these regardless of the cause. The Civil Aviation Authority requires the airline to offer either a full refund for the unused parts of the ticket or an alternative flight at a time that suits you, plus a reasonable amount of food and drink (usually vouchers), a means to communicate, and accommodation with transport if you are rerouted overnight. If the airline cannot arrange it, you can arrange it yourself and claim it back, so keep every receipt.
2. Fixed cash compensation. You do not get this here. The CAA lists "airport or air traffic control employee strikes or other extraordinary circumstances" as excluded. An air traffic control system failure is an extraordinary circumstance outside the airline's control, so the fixed sums (£520 per person on a long-haul flight like Singapore to London, or £260 where the replacement gets you there within four hours) are not payable for this event.
The CAA's own passenger notice puts it plainly, telling anyone affected by delays or cancellations "following Tuesday's air traffic control issues at NATS" that they may be entitled to help. Help means care and rerouting. It does not mean a cheque.
Travel insurance: the timing trap
If you already held a travel policy before 8 September, travel delay and trip cancellation benefits may respond, subject to your minimum delay hours, your limits and your documents. Keep the airline's written notice of the cancellation or diversion, because that is what an insurer asks for.
If you are buying a policy now for a London trip later this week, read the known event exclusion first. Singapore travel insurers routinely exclude anything already reported in the media or announced by the authorities at the time you buy, and this failure has been public news since 8 September. This is general information, not insurance advice. Check your own policy wording and speak to your insurer.
Before you leave for the airport
- Check your flight on the airline's own status page, not yesterday's app notification and not this article. Heathrow is explicit that you should only travel if your flight is confirmed as operating.
- Update your contact number under Manage Booking. Airlines rebook by contacting you, which only works if the number on the booking is one you answer.
- If you booked through a travel agent, an OTA or a partner airline, go back to them. They hold the ticket and they are the ones who can reissue it.
- Keep receipts for meals, hotels and transport you pay for yourself. On a Heathrow departure that is reimbursable; on any flight it helps an insurance claim.
- Do not book a tight onward connection in the next few days. Aircraft and crew are still out of position.
Related
- Anak Krakatau Eruption: SIA Retimes 6 Singapore to Jakarta Flights - the other flight disruption running this week
- 5 Best Travel Insurance Plans in Singapore (2026) - what the delay and cancellation benefits actually pay
- 5 Best Annual Travel Insurance Plans in Singapore (2026) - if you fly to Europe more than twice a year
- New Green Levy on Flights Out of Singapore - the CAAS levy on tickets sold from 1 October 2026
*Sources: NATS statements timestamped 8 September 2026 (3.25pm, 7.30pm, 10.10pm) and 9 September 2026 (12.55pm) on nats.aero; Heathrow Airport's "NATS air traffic control technical issue" notice of 9 September 2026 on heathrow.com; the UK Civil Aviation Authority's cancellations guidance and passenger notice on caa.co.uk; and a Singapore Airlines spokesperson's statement of 9 September 2026 reported by CNA. Flight status changes hourly: confirm on singaporeair.com before you travel. Photos: Singapore Airlines official aircraft images (singaporeair.com).*
