When does construction start and how long will it take?

Works are set to begin in January 2026, funded by a £600 million terminal programme. The upgrade will proceed in phases to keep flights operating. Management will confirm detailed timelines as contracts are awarded. Expect progress updates tied to key milestones and commissioning dates as sections open to passengers.

What is the new passenger cap at Stansted?

Local approval supports a throughput path to 48–51 million passengers by 2040. This higher ceiling, paired with terminal upgrades, gives airlines confidence to plan growth. The cap frames future route decisions and helps align infrastructure spending with expected demand at the airport.

Could Stansted become the UK’s second busiest airport?

Yes, if traffic grows as planned and airlines commit capacity, Stansted could move into the No.2 position. The new 51 million cap and terminal upgrade 2026 strengthen that case. Actual ranking will depend on competitor performance, macro demand, and execution during the construction phase.

What should investors watch during the expansion?

Focus on contract awards, planning-condition sign-offs, monthly passenger data, and route announcements. Retail leasing and car park projects are useful leading indicators for non-aero revenue. Monitor budget discipline and any scope changes, since both can affect timelines, returns, and the overall investment thesis.

Global Market Insights

Stansted Airport, December 29: 51M Cap Greenlight Puts No.2 Within Reach

ByHuzaifa Zahoor December 29, 2025December 29, 2025

Stansted Airport expansion has been approved, lifting the passenger cap to 48–51 million by 2040 alongside a £600 million terminal upgrade starting in January 2026. This scale-up could move Stansted into the UK’s No.2 slot by traffic, ahead of rivals if growth holds. For investors, more capacity often means new routes, higher retail sales, stronger parking and transport income, and wider regional gains. We explain the timeline, the UK airport rankings angle, and where value could emerge next.