United Airlines, American Airlines, Delta Air Lines, and Alaska Airlines just dropped their 2027 international schedules within days of each other, adding dozens of new nonstop routes to Europe and Asia.
The expansion is the largest in United's history. American is adding seven new routes, many on its new long-range Airbus A321XLR aircraft. Alaska and Delta are each opening first-ever nonstops from their home hubs to marquee European cities.
For travelers who book early, new routes are where the cheapest seats live.
What the new routes actually cover
United is adding 10 new international cities to its network, mostly from Newark. The new destinations include Ibiza and Valencia in Spain, Marseille in France, Ljubljana in Slovenia, Olbia in Sardinia, Catania in Sicily, Terceira in the Azores, and Luxembourg.
Washington Dulles gains a new nonstop to Toulouse, France, and Denver gets a daily flight to Paris starting May 27.
American is adding seven routes for summer 2027. Porto and Vienna join American’s network for the first time from Philadelphia, while Reykjavik returns for the first time since 2019. American will be the only US airline flying nonstop to Vienna when the route launches in May.
Delta's headline addition is a daily nonstop from Austin to Paris Charles de Gaulle starting March 27, the first-ever nonstop from the Texas capital to Europe.
Alaska is launching its first-ever Seattle-Athens service on May 12 and a Seattle-to-Paris route on May 25, both running through October.
Why airlines are chasing smaller cities
Airlines are expanding service to lesser-known European destinations as travelers look beyond traditional vacation spots.
"They want to get away from the overcrowded, large European cities."
Patrick Quayle, United Airlines
United noted that travelers are also booking more open-jaw itineraries, flying into one city and returning from another without backtracking. Having multiple destinations in the same country, like Sardinia and Sicily alongside Rome, makes United's network more useful to that type of traveler.
The Airbus A321XLR is doing a lot of the heavy lifting here. The single-aisle plane can fly up to 4.7K nautical miles and costs less to operate than a widebody.
American's senior vice president of network and schedule planning said the XLR opens up the menu for destinations that are too small for a widebody.
That lower operating cost lets airlines serve thinner routes profitably, which is exactly why Vienna and Porto are now on American's map.
United CEO Scott Kirby told CNBC that the shoulder season is now generating real revenue. October has become one of United's best months, and several new routes are designed to run well past peak summer.
How to use this routing wave
New routes carry introductory pricing that disappears once demand firms up. The window between announcement and departure is the best time to search.
For travelers flying from hubs that now have more competition, like Newark to southern Europe or Philadelphia to Portugal, added capacity from multiple carriers tends to keep fares lower than on thinner routes.
American's Vienna route runs through January 2028, covering European Christmas markets, which means the travel window extends past summer and into a period when transatlantic fares are historically lower.
Philadelphia to Porto opens March 28, one of the earliest launch dates in the batch, giving the longest runway to find seats before holiday demand kicks in.
Flights on less frequent routes tend to book up sooner. Newark to Olbia, for example, operates only three times a week, so locking it in early leaves travelers with more choice before availability tightens.