United Airlines announced Tuesday that it is adding new routes from the U.S. to Europe and Asia in the largest international network expansion in the company’s history.

Beginning as early as March 2027, United will fly to 10 new international cities across Europe and Asia, with service originating from its hubs in San Francisco, Washington, D.C., and Newark, N.J. The carrier said it already serves more international destinations than any other U.S. airline, and the latest additions deepen that footprint in smaller markets that have not historically had as many nonstop U.S. options.

"The creative and strategic way we've expanded our international network since the pandemic has made all the difference, not only for our customers and employees, but also as a way to differentiate United and build a brand focused on customers," United CEO Scott Kirby said.

New routes

From San Francisco to Okinawa, Japan, beginning March 27, with service three times weekly on the Boeing 777-200ER.

From Washington Dulles to Toulouse, France, beginning April 26, with daily service on the A321XLR.

From Newark to:

• Luxembourg City, Luxembourg, beginning April 2, with daily service on the A321XLR.
• Ljubljana, Slovenia, beginning May 12, with four flights weekly on the Boeing 767-400ER.
• Olbia, Sardinia, Italy, beginning May 27, with three flights weekly on the Boeing 767-300ER.
• Catania, Sicily, Italy, beginning May 28, with four flights weekly on the Boeing 767-300ER.
• Ibiza, Spain, beginning May 31, with four flights weekly on the A321XLR.
• Valencia, Spain, beginning June 2, with three flights weekly on the A321XLR.
• Marseille, France, beginning June 4, with daily service on the A321XLR.
• Terceira, Portugal, beginning June 9, with three flights weekly on the Boeing 737 Max 8.

The airline is also adding service on routes it already operates, including Los Angeles to Osaka, Japan, beginning March 27; Washington, D.C., to Milan, Italy, beginning May 28; and Denver to Paris, beginning May 27. United also said it will resume service from San Francisco to Tel Aviv on March 28.

United said Tuesday it expects to receive enough Airbus A321XLR aircraft to support its European expansion next summer, as the carrier moves into smaller markets and expects travel to the region to remain strong into the autumn months.

Patrick Quayle, United’s senior vice president of global network planning and alliances, said the program has had "a few teething issues," but added that the airline expects to have enough aircraft delivered to operate the planned routes.

"We feel confident that we will have the number of aircraft needed in order to operate the schedule," he told reporters.

United ordered the A321XLR, a long-range single-aisle jet, in 2019 and plans to begin international service with the aircraft on Dec. 1, 2026, from Washington Dulles to Amsterdam and Dublin. The aircraft gives United more flexibility to serve transatlantic routes with narrower planes than its wide-body fleet, which is part of why it can add destinations like Toulouse, Ibiza and Marseille while building out more point-to-point service from Newark and Washington.

Quayle also said United is phasing out its Boeing 757 fleet as the A321XLR enters service, and that the airline’s fleet plan is updated regularly to reflect delays at aircraft manufacturers.

Reuters contributed to this report.