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Heathrow's Third Runway Just Slipped Four Years to 2039, Here's What Actually Changes for Your Fare

Heathrow says its 2035 third-runway deadline is unrealistic and now targets 2039, leaving London's capacity squeeze unresolved for years.

By Laxman Rawal · Sep 26, 2026

Heathrow has told the UK government that its own promise to open a third runway by 2035 cannot be kept. The airport's new target is 2039, a four-year slip, and the reason is not politics but arithmetic: planning permission alone is not expected before 2029…

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What Heathrow just told the government

Heathrow's answer to ministers is blunt: the 2035 date they backed is not achievable. Airport bosses say securing planning permission is realistically a 2029 job on its own, and that construction of a full third runway, plus the taxiways, terminal capacity…

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Why the 2035 date was already the ambitious one

The 2035 deadline was never Heathrow's idea in the first place. Rachel Reeves set it during a major infrastructure speech in January 2025, when she threw the government's support behind expansion as a growth measure and talked about 100,000 new jobs. Heathrow…

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What this means if you're flying through Heathrow before 2039

Nothing changes at check-in tomorrow, but the underlying problem the runway was meant to fix, Heathrow running close to full capacity on two runways, stays in place for at least four more years than promised. That keeps pressure on long-haul fares and slot…

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What happens next

The immediate milestone to watch is the 2029 planning-permission target, which will need to survive the kind of legal and environmental challenges that sank Heathrow's previous expansion attempt in the courts. Local residents' groups and climate campaigners…

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