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Transatlantic airline traffic reaches record highs as incumbent carriers expand service

Transatlantic airline traffic reaches record highs as incumbent carriers expand service
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Bernd Bauer, CEO | Edelweiss Air

Airlines are operating more passenger flights between the United States and Europe in August 2025 than in any previous month, according to data from Cirium Diio. There will be an average of 620 daily departures during the peak summer period, representing an increase of 26 daily services compared to August last year.

The expansion is attributed solely to existing airlines, as no new carriers have entered the market. A total of 39 airlines will fly these routes in August, with 23 increasing their number of flights over last year. The three largest US carriers—American Airlines, Delta Air Lines, and United Airlines—account for about 44% of all transatlantic departures, averaging a combined 270 daily flights.

Growth among airlines was measured by percentage change in the number of US-Europe flights. Finnair and Neos led with a 41% increase each compared to August 2024. Finnair’s growth came from adding more flights to Chicago O'Hare, Dallas/Fort Worth, and Los Angeles. Neos increased its numbers primarily by launching service between Bari and New York JFK.

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Edelweiss was third with a 34% rise due to its new Zurich-Seattle route. IberoJet followed at fourth place with a 25% increase after boosting frequency on its Madrid-Orlando route. KLM rounded out the top five with a 17% jump; this was driven by starting Amsterdam-San Diego service (replacing Delta’s Portland flight) and adding more departures elsewhere, especially to Las Vegas.

Some airlines saw declines in their US-Europe operations. PLAY reduced its US flights by 45%, ending all American routes; Keflavik-Washington Dulles ended last December, while Boston and Stewart services will conclude in September. Singapore Airlines cut back by 42%, discontinuing its Singapore-Manchester-Houston service—the world’s longest one-stop flight by block time. TUI decreased its operations by 32%, Azores Airlines by 30% (shrinking from nine US routes to four), and Condor by 17%. Compared to last year, Condor no longer serves Frankfurt-Baltimore, Minneapolis, Phoenix, or San Antonio.

Despite dominating the market share for transatlantic travel, American Airlines, Delta Air Lines, and United Airlines also grew their offerings this August but did not appear among the fastest-growing carriers when ranked by percentage change due to their already large scale. American and United added about 7% more services each; Delta increased by 4%.

American now operates 57 European routes for August including new connections such as Charlotte-Athens; Chicago O'Hare-Madrid and Naples; Dallas/Fort Worth-Venice; Miami-Rome; Philadelphia-Edinburgh (with widebody aircraft); and Philadelphia-Milan Malpensa. However, it discontinued O'Hare-Venice since last year.

United expanded to serve Denver-Rome; Newark-Bilbao, Faro, Funchal, Palermo; Washington Dulles-Nice and Venice—bringing its total European destinations up to 81.

Delta offers service on 77 European routes including additions like Atlanta-Brussels/Naples; Boston-Barcelona/Milan; Detroit-Dublin; New York JFK-Catania; Minneapolis-Copenhagen/Rome (the former reflecting SAS joining SkyTeam); Tampa-Amsterdam—but dropped Atlanta-Stuttgart and Portland-Amsterdam (the latter replaced by KLM).

"Despite the trio's inevitably high dominance, they have expanded strongly in August. They have added nearly one in two of the market's additional departures," according to carrier submissions reviewed for this report.

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Organizations Included in this History
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