The World's Largest Airline By Number Of Routes

The commercial aviation industry has undergone a significant number of changes over the years. Since the 1950s, when airlines around the world helped to usher in the jet age of the industry, commercial aviation has changed drastically. The introduction of early jet airliners, such as the Douglas DC-8 and the Boeing 707, helped to revolutionize long-haul travel. Additionally, the introduction of widebody airliners, such as the Boeing 747, helped global airlines to begin transporting a high number of passengers across various routes.

As a result, demand for air travel has been increasing steadily since the mid-to-late 20th century. Newer and more fuel-efficient aircraft, alongside emerging markets and the deregulation of airspace, have contributed to this continued growth. Even in recent years, following the COVID-19 pandemic, demand has rebounded, and the commercial aviation industry is growing. With this changing demand, airlines around the world are responding with revised route strategies. For many airlines, this means increasing the number of destinations the airline operates to, with many expanding their operations year-over-year. Let’s take a closer look at the world’s largest airlines in terms of destinations flown to around the world.

United Airlines: Serving The Most Global Destinations

In 2025, several airlines have expanded their operations to fly to over 300 destinations. However, according to Cirium, an aviation analytics company, the largest airline in terms of unique destinations is United Airlines. The Chicago, Illinois-based airline is flying to a staggering 373 destinations in 2025, twenty more than the second airline on the list, American Airlines.

United Airlines is known for operating an extensive domestic and international route network. This network spans across most of the United States, as well as six continents. The airline operates its regional service, United Express, to fly to many of its smaller domestic locations, although its mainline service flies many of its international routes. Overall, United Airlines flies to nearly 150 international destinations spread across 76 different countries.

The airline is also a founding member of the Star Alliance, one of the largest airline alliances in the world, alongside airlines like Air Canada, Air New Zealand, Turkish Airlines, and Lufthansa, among others. United Airlines operates the popular hub-and-spoke model, which allows it to develop such an extensive route network. The major United Airlines hubs include:

The Most Popular United Airlines Routes

In 2025, United Airlines will fly to a total of 373 different destinations around the world. The most popular flights are obviously from a major United Airlines hub in the United States. According to Cirium, the most popular United Airlines flight this month is connecting Chicago O’Hare to LaGuardia Airport (LGA) in New York City, New York. United will fly this route over 440 times in October 2025, with capacity for over 73,000 seats.

Several other popular routes also stem from the United Airlines headquarters in Chicago. For example, the second most popular route in October connects Chicago to Newark. The airline will fly this route a total of 378 times, with capacity for nearly 70,000 seats. According to Cirium, other popular routes from Chicago O’Hare include:

Even so, the airline also operates an extensive network of routes from other hubs. One of the airline’s most popular flights this month connects Denver to Colorado Springs Airport (COS) in Colorado. This flight is scheduled to operate 353 times, with capacity for just over 24,000 seats. Denver to Houston is another popular route, flying 337 times this month. Additionally, its transcontinental service from San Francisco to Newark is scheduled to fly just over 330 times, with capacity for over 80,000 seats.

A Brief History Of United Airlines

The origins of United Airlines can be traced back to 1926, although the airline was officially formed in 1931 through the merger of several smaller airlines. The parent company was designated United Aircraft and Transport Corporation, which also included Boeing. In the decades that followed, United Airlines became a major player in the commercial aviation industry, helping to develop passenger air service across the United States.

By the 1960s, United Airlines was continuing to innovate, including flying the first all-jet fleet. The airline was also one of the first to develop computerized reservation systems, which helped to contribute to the modernization of the commercial aviation industry. Even so, United struggled during the 1970s, when the airline industry was deregulated. The company also struggled in the early 2000s, following the decline of commercial travel following the 9/11 attacks, which resulted in a bankruptcy filing.

However, United Airlines was able to hold strong through the 2000s. In 2010, United Airlines merged with Continental Airlines, creating one of the world’s largest air carriers. Since the merger, United Airlines has continued to expand, which has allowed the airline to serve hundreds of destinations across six different continents, making it the largest airline in the world in terms of destinations.

A Closer Look At The Fleet Of United Airlines

Since United Airlines has been around for nearly 100 years, it makes sense that the airline has operated a diverse fleet of aircraft. Historically, the airline operated a small fleet of Douglas aircraft, including flying several variants of the DC-6, the DC-8, and the DC-10 in limited roles. The airline was also the launch customer of the Boeing 720, and later added iconic aircraft like the Boeing 747 to its fleet.

Over the years, United Airlines has operated a variety of narrowbody aircraft, especially as the commercial aviation industry has changed. The airline flew several early variants of the Boeing 737, including variants like the 737-200, 737-300, and the 737-500. Currently, the airline flies a variety of narrowbody aircraft. According to ch-aviation, the airline flies the following narrowbody aircraft:

United also has significant orders for more Boeing 737 MAX 9s and the soon-to-be-certified 737 MAX 10, alongside an order for 50 Airbus A321XLRs. On the widebody side, United Airlines flies only Boeing aircraft. This includes the popular Boeing 767 series, of which it flies 53 aircraft. United also operates nearly 100 Boeing 777, as it was the launch customer for the aircraft type. The carrier also flies all three variants of the Boeing 787 Dreamliner.

How The Other Domestic Airlines Fair In Terms Of The Number Of Destinations

Beyond United Airlines, several other US-based airlines find themselves at the top of the list of airlines flying to most destinations. Two other airlines fly to over 300 destinations around the world, both of which are based in the US.

American Airlines flies to the second-most destinations in the world. According to Cirium, the airline flies to 353 total destinations. These destinations are located in nearly 50 different countries around the world. American Airlines is also the largest airline in the world in terms of passengers carried and daily flights. Currently, American Airlines flies almost 6,800 flights per day. According to Cirium, its most popular flights include:

Delta Air Lines is the airline with the third-most destinations in the world. Currently, the airline flies to a total of 308 different destinations around the world. Its most popular route connects Hartsfield-Jackson Atlanta International Airport (ATL) to Orlando Airport (MCO). Some of the airline’s other most popular flights start from its base in Atlanta, including flying to destinations like LaGuardia Airport (LGA), Fort Lauderdale-Hollywood International Airport (FLL), and Tampa International Airport (TPA).

Other Global Airlines With A Significant Number Of Destinations

Beyond US-based airlines, several other global carriers operate to a significant number of destinations. Turkish Airlines flies to a total of 281 destinations, many of which originate at its base at Istanbul Airport (IST). Ryanair, the low-cost Irish carrier, flies to a total of 232 destinations, many of which are located in or around Europe.

Several Chinese carriers find themselves with a high number of destinations. This includes the airlines with the sixth, seventh, and ninth most destinations. China Eastern Airlines flies to 219 destinations, China Southern Airlines flies to 217 destinations, and Air China flies to 204 destinations.

The other carrier that flies to over 200 destinations is British Airways, flying to a total of 209 different cities around the world. Additionally, Lufthansa rounds out the top 10 airlines with the most destinations. The German airline flies to 193 different cities.