What Are The Airlines With Most Delays & Cancellations This Summer?

Flying can be stressful, especially if your trip isn’t going according to plan. Disruptions like delays and cancellations happen daily, especially during the busy summer months. On average, that’s around 172 flight disruptions per day. 

But what were the airlines with the most disruptions this summer? And what were the most common reasons for the disruptions? Let’s break down the top 10 airlines with the most delays and cancellations. 

Which airlines had the most delays and cancellations in the summer? 

Based on our data, here’s a list of the top 10 airlines with the most delays and cancellations during the summer, ranked by the number of disruptions. 

Despite improvements in airline traffic and scheduling optimisations, these airlines still recorded some of the highest numbers of delays, cancellations, and missed connections. But how did that affect passengers? Let’s break it down. 

1. Wizz Air Group

Wizz Air takes the crown in our ranking for the airline with the most delays and cancellations this summer. The Hungarian airline had the largest volume of disrupted flights. Based on SkyRefund’s analysis, roughly every 1 in 13 Wizz Air flights was disrupted during the summer months. 

Wizz Air experienced the largest number of delays at the airports in London, Belgrade, and Tirana. 

And while Wizz Air recorded the largest number of delays this summer, the carrier shows a downward trend in delays and cancellations year over year. Our data shows that there is a 3% improvement in Wizz Air’s performance in comparison to 2024. 

2. easyJet Group

easyJet takes the silver in our ranking of the airlines with the most delays and cancellations this summer. This is roughly 1 in 19 flights that were disrupted this summer. 

easyJet’s disruptions have grown with 3.5% in comparison to the same period last year. Their most problematic destinations include London Luton in the UK, Dalaman Airport in Türkiye and Larnaca Airport in Cyprus. 

3. Ryanair 

Ranking 3rd on our list, Ryanair passengers experienced mostly delays over cancellations. The Irish carrier experienced a disruption, on 1 in every 40 Ryanair flights. Comparatively, this is lower than the others on our list. But considering they operate roughly 3,500 flights per week, a large volume of passengers have been affected by a Ryanair disruption. 

Some of the destination with most delays or cancellations include London, Marrakesh, and Faro. Ryanair has shown a downward trend in flight disruptions year over year. 

The company has also been making headlines in the summer with their new luggage restrictions, digitalization of boarding passes and cutting down of seats across countries like Spain and Germany due to ongoing disputes with the local governments. 

4. British Airways

British Airways flight disruptions have remained relatively the same in comparison to summer 2024. But it remains one of the airlines with the most delays and cancellations, putting it as number 4 on our list. 

BA’s heavy hub operations at London Heathrow make it especially sensitive to airspace congestion and bad weather. Aside from British airports, the carrier experienced the most disruptions in the US and Spain this summer.  

5. Air Serbia

Ranking 5th on our list, Air Serbia experienced delay or cancellation on every 1 in 20 flights during the summer months. This is more than last year, when 4.4% of the claims we received were from Air Serbia. 

Although smaller in fleet and network than many major European carriers, Air Serbia faces significant operational risks due to its regional positioning. For example, bottlenecks in regional air traffic control and cascading delays in the Balkan region mean many flights operate with tighter buffers.

For passengers connecting via Belgrade or other regional hubs, missed onward flights and cascading delays were noted, especially on routes to Hurghada, Rhodes and New York. 

6. Turkish Airlines

Türkiye’s flag carrier is the 6th most delayed carrier this summer, with 1 in every 32 flights experiencing a disruption. Their passengers experienced more delays over cancellations, mostly on domestic flights. Problematic international destinations for Turkish Airlines include Islamabad, New Jersey, and Montepuez. 

Disruptions on Turkish Airlines’ flights have grown year over year but have dropped in comparison to the first quarter of 2025. Luckily, your disrupted Turkish Airlines flight might be protected by Turkish law. Learn more about your rights under SHY-Passenger Regulation in our guide. 

7. KLM

With a disruption on every 1 in 22 flights, KLM ranks 7th on our list of worst airlines. Most of the delays and cancellations were on international routes, predominantly those to the US. Aside from their domestic hub, Schiphol in Amsterdam, problematic destinations for KLM included New York and Barcelona. 

Unfortunately, in comparison to last year, KLM experienced more disruptions in summer 2025. Considering the overall upward trend in arrival punctuality this summer, the Dutch carrier earns its place on our list. 

8. Lufthansa

While experiencing fewer disruptions than last summer, Lufthansa ranks as one of the most delayed airlines this summer. At 8th position, every 1 in 31 flights of Lufthansa has experienced a disruption eligible for compensation. Frequent flyers with the airline will be delighted to know that Lufthansa's flight disruptions have slightly dropped in comparison to last year. 

Most problematic destinations for the German airline include Manchester, Glasgow, Brisbane, and Montreal. 

9. Transavia Group

 Transavia is the airline on our list with the lowest frequency of disrupted flights. On average, 1 in every 46 Transavia flights were disrupted this summer. 

Unfortunately, the Dutch carrier has shown a growth in claims year over year, particularly on routes arriving in London, Tirana and Dalaman. Interestingly, Transavia is the only airline on our list which experienced a disruption on airport in London — Heathrow, Luton, Stansted, and Gatwick. 

This is a good tip to remember if you intend to fly to London with Transavia. 

10. Air France

Rounding up our list of the top 10 of the airlines with the most delays or cancellations this summer is Air France. The country’s flag carrier experienced a disruption on every 1 on 35 flights this summer. This is a positive trend in comparison to last year. 

Most disruptions on Air France flights were domestic and caused by ATC strikes, which had the French airspace in a gridlock this summer. Notable destinations include Nice, Lahore, and Miami. Similarly, to KLM, most international disruptions were to flights landing in the US. 

Why were flights delayed or cancelled in summer 2025?

During the summer, the most common reason for disruptions were technical issues, knock-on delays and ATC strikes. Around 26% of the claims we received were due to technical issues. Knock-on effect and strikes accounted for around 10% each of the reasons for delays. 

Passengers predominantly experienced delays, with over 60% of all disruptions being caused by flight delays between 3 and 5 hours. 

Overall, there is a drop in disruptions in comparison to last summer. This aligns with findings from Eurocontrol, who found a 27% decrease in delays this year. 

How did these delays and cancellations impact passengers? 

Millions of passengers were affected by delays and cancellations during the busy summer months. Holidays had to be postponed, connections were missed, and passengers have told us of countless hours spent at the airport. Below, you can see a summary of our findings for the airlines with the most delays and cancellations this summer. 

• Low-cost carriers (Wizz Air, Ryanair, easyJet, Transavia) had the highest rates of disruption.
• Legacy carriers (British Airways, KLM, Lufthansa, Air France, Turkish Airlines) maintained better service but faced systemic airspace and strike-related issues.
• We received the fewest compensation claims for morning flights, while midday and early afternoon flights accounted for the majority of delay-related claims, making them the most disruption-prone times of day. 
• Most passengers were unaware of their rights before experiencing a flight disruption. Learn when you're entitled to compensation with our guide on air passenger rights. 

What is SkyRefund’s ranking based on?

Our ranking of the airlines with the most delays and cancellations this summer is based on SkyRefund’s internal statistics for the period June-August 2025, covering the peak summer travel season worldwide. We analysed tens of thousands of flights reported by passengers and verified the date using official airline and tracking sources. 

Airlines were ranked by the share of disrupted flights — those delayed by more than 3 hours, cancelled within 14 days of departure, or denied boarding. Only carriers with a significant flight volume in our database were included. 

How can SkyRefund help?

If your flight was delayed or cancelled this summer, you could be entitled to compensation. At SkyRefund, we make it easy for passengers to claim what they’re owed and fully exercise their air travel rights. 

With over 8 years of legal experience and a global legal network trusted by more than 1 million passengers, we handle the process on your behalf — so you don’t have to deal with the airline yourself.