Summer 2026 Flight Delay Forecast: Which Airports and Routes Will Be Worst

Summer is peak disruption season in European aviation. Driven by surging leisure demand, stretched air traffic control capacity, and now a major new wildcard — the EU's Entry/Exit System (EES) — summer 2026 is shaping up to be one of the most complex travel seasons in recent memory.

This forecast draws on official data from EUROCONTROL, IATA, ACI Europe, and Airlines for Europe (A4E) to give you the most accurate picture of what to expect — and what your rights are if things go wrong.

The Baseline: How Have Recent Summers Performed?

Before forecasting 2026, it helps to understand where we've come from. EUROCONTROL's summer performance data provides the benchmarks:

Season	Total Flights	ATFM Delay / Flight	Arrival Punctuality
Summer 2023	2,989,583	3.8 min	~66%
Summer 2024	3,131,864	5.4 min	65%
Summer 2025	3,231,264	3.9 min	~71%

Source: EUROCONTROL Summer Performance Reports and EUROCONTROL Flash Briefing Summer 2025

Summer 2024: The Worst in Years

Summer 2024 was the worst-performing European summer for several years, with average Air Traffic Flow Management (ATFM) delays hitting 5.4 minutes per flight — compared to 3.8 minutes in 2023. July alone averaged 6.5 minutes of ATFM delay per flight. Arrival punctuality fell to just 65% and the all-causes average departure delay reached 21.4 minutes per flight, some 4.5 minutes above pre-pandemic 2019 norms.

Summer 2025: A Meaningful Recovery

Summer 2025 brought significant improvement. ATFM delays fell 27% to 3.9 minutes per flight, total ATFM delay minutes dropped 25% (from nearly 17 million to 12.7 million), and arrival punctuality recovered to approximately 71%. The improvement was real but fragile — the underlying capacity and staffing constraints that drove 2024's delays were not resolved.

Capacity and staffing remained the single largest cause of en-route ATFM delays in 2025, accounting for 58% of total en-route ATFM delay minutes. (Source: EUROCONTROL European Aviation Overview 2025)

The 2026 Forecast: Growing Traffic, Persistent Bottlenecks, and a New Risk

Traffic Growth Is Locked In

For 2026, EUROCONTROL forecasts European network traffic of 11.4 million flights in the base scenario. See also our EU flight compensation statistics for historical delay data that contextualises these forecasts. — a growth rate of +3.2% (±1.7 percentage points) versus 2025. The high scenario projects +5.1% growth; even the low scenario projects +1.3%. (Source: EUROCONTROL Forecast Update 2025–2031, October 2025)

Growth is not evenly distributed. Leisure demand and low-cost carrier expansion continue to drive disproportionate traffic increases in southern and Mediterranean Europe — exactly where ATC capacity is most stretched.

The EES Wildcard: Queues Up to Four Hours

The most significant new risk for summer 2026 is the EU's Entry/Exit System (EES) — a new biometric border registration system for non-EU nationals entering the Schengen area. The system requires facial recognition and fingerprint scanning at every entry and exit.

In February 2026, ACI Europe (Airports Council International), A4E (Airlines for Europe), and IATA issued a joint warning: "Severe disruptions over the peak summer months are a real prospect, with queues potentially reaching four hours." (Source: IATA, February 2026)

The three organisations called on the European Commission to confirm that Schengen member states retain the ability to partially or fully suspend EES implementation until October 2026. Without such flexibility, airports with high volumes of non-EU travellers face structural throughput constraints precisely during the peak July-August travel weeks.

Airport and airline leaders identified three underlying drivers:

1. Chronic understaffing at border control positions
2. Unresolved technology problems linked to border automation
3. Limited use of the Frontex pre-registration app by Schengen states

Airports built around traditional passport checks are still adapting to biometric kiosks and new processing lanes. The combination of rising volumes and a new, unproven system is a high-risk scenario.

ATFM Delay Forecast for Summer 2026

Based on traffic growth, structural capacity constraints (particularly in southern Europe), and the EES risk, the base-case forecast is for ATFM delays per flight in the mid-3 to low-4 minute range — broadly similar to summer 2025, with upside risk if EES causes significant airport throughput reductions.

If EES disruptions are significant, passenger-facing delays could be materially worse than ATFM data alone would suggest, as airside and landside congestion interacts.

Airport-by-Airport: Where Delays Will Be Worst

Athens International (ATH) — Tier 1 Risk

Athens saw the highest total ATFM delay minutes of any European airport in 2025, driven by ATC capacity constraints during peak summer months compounded by runway works in winter. (Source: EUROCONTROL European Aviation Overview 2025)

With no indication that ATC staffing at Greek airspace has been resolved, and with traffic expected to rise further, Athens remains the highest-risk airport heading into summer 2026. EES introduces additional pressure at the border for non-EU travellers arriving from outside Schengen.

Routes most at risk: All inbound leisure routes to Athens from UK, Germany, Scandinavia, and North America.

Amsterdam Schiphol (AMS) — Tier 1 Risk

Amsterdam Schiphol suffered from aerodrome capacity regulations and weather events throughout 2025, with high winds and low-visibility events causing the highest individual delays and snow disruption towards year-end. (Source: EUROCONTROL European Aviation Overview 2025)

Schiphol is also a major entry point for non-EU travellers, making it a front-line airport for EES border processing delays. The airport has been operating under a government-imposed flight cap, further limiting its ability to absorb disruptions.

Routes most at risk: Long-haul connections via Schiphol to Iberia, Mediterranean, and North Africa.

Barcelona El Prat (BCN) — Tier 1 Risk

Barcelona ACC (Area Control Centre) experienced 1.2 minutes of delay per flight in 2025, with a "complicated summer in terms of weather, compounded by a yearly 5% traffic increase." Capacity delays accounted for 66% of ATFM delays, weather 32% — both "increasing significantly compared to 2024." (Source: EUROCONTROL European Aviation Overview 2025)

Spain as a whole accounted for 13% of all en-route ATFM delays in 2025, with Barcelona ACC (+26%) and Madrid ACC (+43%) generating 77% of Spain's en-route delays. With traffic continuing to grow at 5% annually, capacity shortages are likely to persist.

Routes most at risk: Short-haul leisure routes from UK and northern Europe to Barcelona; Barcelona–Ibiza; Barcelona–Mallorca.

Palma de Mallorca (PMI) — Tier 1 Risk

Palma is Europe's busiest purely leisure airport and one of the most seasonally concentrated hubs on the continent. Its limited runway capacity, combined with extreme seasonal traffic peaks in July and August, makes it structurally vulnerable to cumulative delay building.

Spain's contribution to ATFM delays — 13% of the European total — reflects the broader Iberian airspace stress that peaks at Mallorca. Direct aerodrome-specific delay data for PMI is not published separately, but its position as a seasonal bottleneck is well established.

Routes most at risk: UK-Palma, Germany-Palma, and Scandinavian charter routes.

Marseille ACC Area (including Nice, Montpellier) — Tier 2 Risk

Marseille was the only European ACC to finish 2025 with en-route ATFM delays higher than 1.3 minutes per flight, recording 2.6 minutes per flight. Recurring capacity and staffing delays (73% of Marseille's delays) increased by 147% versus 2024. Bad weather accounted for 18%, also increasing 36% year-on-year. (Source: EUROCONTROL European Aviation Overview 2025)

Marseille's airspace covers much of France's Mediterranean coast, including Nice Côte d'Azur — one of Europe's most popular summer destinations. If staffing issues persist, the Marseille ACC area carries substantial contagion risk to neighbouring French airspace.

Reims ACC (Paris CDG area) — Tier 2 Risk

Reims ACC registered 1.3 minutes of delay per flight in 2025, with recurring capacity and staffing issues (74% of delays). (Source: EUROCONTROL European Aviation Overview 2025)

Reims ACC sits directly under some of the busiest European airways, including the Paris CDG arrival flows. Capacity problems here propagate quickly into the broader northern European network. Paris CDG is also a major EES processing hub given its volume of non-Schengen arrivals.

Heathrow, Schiphol and Paris CDG: February 2026 Preview

A February 2026 disruption event saw 1,115 disruptions across Heathrow, Schiphol, Paris CDG, and Barcelona simultaneously — described as "a continent-wide system failure driven by the convergence of airport congestion, chronic staffing shortages, aircraft rotation failures cascading from Italy strike, and sustained peak-travel pressure with no operational slack in the network." (Source: TravelTourister, February 2026)

This event in low season is a warning about summer vulnerability. The operational slack that absorbed disruption in quieter months simply doesn't exist in peak July.

Practical Tips for Summer 2026 Travellers

1. Fly early in the day. ATFM delays compound through the day. First departure slots are significantly less likely to suffer cascading delay from knock-on aircraft rotation issues.

2. Avoid peak connection banks at Schiphol and CDG. These hubs are operating near capacity in summer and have limited buffer for late-arriving feeder flights.

3. Book direct flights to Mediterranean leisure destinations where possible. Transiting through a congested hub adds risk on top of risk.

4. Allow extra time at Schengen entry points. With EES now in operation, non-EU passport holders face new biometric scanning requirements. ACI Europe and IATA warned in February 2026 that queues could reach up to four hours. (Source: ACI Europe / IATA, February 2026)

5. Know your rights before you travel. Under EC261/2004, if your flight is delayed 3+ hours on arrival, cancelled with less than 14 days' notice, or you're denied boarding, you are entitled to compensation of €250–€600. Read more: Your Complete Guide to EC261 Rights. And remember: if the airline blames "extraordinary circumstances", check whether that defence actually applies.

6. Keep all documentation. Flight delay certificates, boarding passes, and hotel receipts all support a claim. Airlines are legally required to provide a written notice of your rights at the airport if your flight is disrupted.

If Your Summer 2026 Flight Is Delayed or Cancelled

You don't need to accept a voucher, a rebooking you don't want, or an airline's word that "extraordinary circumstances" applied. Check whether your flight qualifies for compensation — it only takes two minutes: Check My Flight at FlightOwed.

→ Part of the EC261 Complete Guide — see all related guides.

Frequently Asked Questions

Will flight delays definitely be worse in summer 2026 than in 2025?

The base-case forecast from EUROCONTROL projects around 3.2% more flights in 2026 versus 2025, with underlying capacity constraints — particularly in southern Europe — remaining largely unresolved. The EES border system adds a significant new risk. Summer 2026 is unlikely to see a repeat of the severe 2024 disruptions, but the structural conditions for elevated delays are present, especially at Athens, Barcelona, and EES-exposed entry-point airports like Schiphol and Paris CDG.

Which airports are highest risk for delays in summer 2026?

Based on 2025 official data and 2026 forecasts: Athens International (highest ATFM delay minutes in all of Europe in 2025), Marseille ACC area (2.6 min/flight — worst of any European ACC), Barcelona El Prat (1.2 min/flight with 5% traffic growth), and Amsterdam Schiphol (persistent weather and capacity regulation issues). Airports with high non-EU passenger volumes face additional EES-related throughput risk.

What is the EES and why does it matter for my summer 2026 trip?

The EU Entry/Exit System (EES) is a new biometric border system that records the fingerprints and facial images of all non-EU nationals crossing the Schengen border. It was rolled out in 2025–2026. In February 2026, airport industry groups warned it could cause queues of up to four hours at Schengen entry points. If you hold a non-EU/non-EEA passport and are flying into Europe, allow significant extra time for border processing.

Does EC261 cover flight delays caused by airport congestion or border issues?

EC261 covers delays of 3+ hours at the destination airport, regardless of cause — with the limited exception of "extraordinary circumstances" the airline can prove it could not have avoided. Airport congestion is generally considered within the airline's operational planning; border delays on the landside are not the airline's responsibility for EC261 purposes, but delays caused by aircraft rotation issues or ATC slot restrictions usually are. If you're unsure whether your specific situation qualifies, check your flight here.