What is the Busiest Airport in the United States? America’s Top 10 Aviation Hub

Top 10 Busiest Airport in the United States


Busiest Airport in US



Hartsfield–Jackson Atlanta International Airport 

Atlanta, Georgia


Dallas/Fort Worth International Airport 

Dallas and Fort Worth, Texas


Denver International Airport 

Denver, Colorado


O’Hare International Airport

Chicago, Illinois


Los Angeles International Airport 

Los Angeles, California


Charlotte Douglas International Airport 

Charlotte, North Carolina


Orlando International Airport

Orlando, Florida


Harry Reid International Airport 

Las Vegas, Nevada


Phoenix Sky Harbor International Airport 

Phoenix, Arizona


Miami International Airport 

Miami, Florida

What is the Busiest Airport in the United States?

The Busiest Airports in the United States are major transportation hubs that handle a massive volume of passenger traffic and aircraft movements on a daily basis. These airports play a pivotal role in connecting millions of travelers to various domestic and international destinations across the globe. Offering a wide range of facilities and services, the top airports often serve as major hubs for prominent airlines, enhancing connectivity and accessibility. From bustling terminals to efficient ground operations, these airports employ cutting-edge technologies and well-organized systems to ensure smooth and seamless travel experiences for millions of passengers each year. Additionally, they contribute significantly to the economic growth of the regions they serve, supporting tourism, trade, and commerce.


1. Hartsfield–Jackson Atlanta International Airport (ATL)

Hartsfield–Jackson Atlanta International Airport (ATL) holds the distinction of being the busiest airport in the United States and one of the busiest in the world. Located in Atlanta, Georgia, it serves as a major gateway for domestic and international travel. The airport covers a vast area of over 4,700 acres and operates two parallel runways and five parallel taxiways. In 2021, it handled a staggering 36,676,010 passengers boarding flights. ATL is a critical hub for Delta Air Lines, one of the largest airlines globally, which operates over 1,000 daily flights from the airport. The airport’s strategic location makes it an ideal connecting point for travelers flying between various destinations, contributing to its significant passenger traffic.

Hartsfield–Jackson Atlanta International Airport boasts an impressive array of amenities and services for travelers, including a wide selection of shops, restaurants, lounges, and hotels within its terminals. Its efficient transportation system allows easy access to and from the airport via interstates and MARTA (Metropolitan Atlanta Rapid Transit Authority) train service. ATL’s continuous focus on innovation and expansion has led to the construction of modern and visually striking terminals, such as the Maynard H. Jackson Jr. International Terminal, which handles international flights. Additionally, the airport prioritizes sustainability efforts through initiatives like energy-efficient infrastructure and a recycling program. Its relentless commitment to passenger satisfaction and operational excellence has solidified its reputation as a leading global aviation hub.

2. Dallas/Fort Worth International Airport (DFW)

Dallas/Fort Worth International Airport (DFW) is the second busiest airport in the United States and one of the largest in terms of land area. Serving the cities of Dallas and Fort Worth in Texas, DFW spans over 17,000 acres and features five terminals with 165 gates. In 2021, the airport saw 30,005,266 passengers boarding flights. It serves as a significant hub for American Airlines, one of the world’s largest carriers, offering an extensive network of domestic and international connections. DFW operates an advanced Skylink people mover system that efficiently transports passengers between terminals, making connecting flights smoother and faster.

DFW Airport prides itself on delivering a world-class travel experience, providing passengers with a wide range of dining options, retail stores, and services throughout its terminals. Additionally, the airport boasts several lounges, offering comfort and relaxation for premium travelers and frequent flyers. DFW’s commitment to sustainability is evident through initiatives like LEED (Leadership in Energy and Environmental Design) certifications for some of its facilities and ongoing efforts to reduce its environmental impact. With its strategic location in the heart of the United States, Dallas/Fort Worth International Airport continues to play a crucial role in the nation’s air travel industry, facilitating millions of passengers on their journeys each year.

3. Denver International Airport (DEN)

Denver International Airport (DEN) stands as the third busiest airport in the United States and the largest airport by land area in the country. Situated in Denver, Colorado, the airport encompasses over 33,500 acres and features six runways and three concourses. In 2021, it served 28,645,527 passengers boarding flights. DEN is the main hub for Frontier Airlines and a significant hub for United Airlines, offering a vast network of domestic and international connections. The airport’s unique architecture, including the iconic tent-shaped roof of the Jeppesen Terminal, has become a symbol of Denver’s identity and is well-known worldwide.

Denver International Airport is committed to providing passengers with a seamless travel experience, offering a wide variety of dining, shopping, and entertainment options throughout its terminals. The airport’s efficient layout and modern facilities ensure that travelers can easily navigate their way from check-in to boarding gates. DEN is also at the forefront of sustainability efforts, with environmentally friendly initiatives such as solar power generation, LED lighting, and eco-friendly ground transportation options. Its dedication to sustainability earned it a LEED Gold certification for the Westin Denver International Airport hotel, making it the first airport hotel in the United States to achieve this distinction. As a vital transportation hub in the central United States, Denver International Airport continues to see steady growth in passenger traffic, making it a key player in the nation’s aviation landscape.

4. O’Hare International Airport (ORD)

O’Hare International Airport (ORD), located in Chicago, Illinois, is one of the busiest and most significant airports in the United States. With its extensive domestic and international flight connections, it serves as a critical gateway for travelers worldwide. In 2021, O’Hare handled approximately 26,350,976 passengers, making it the fourth busiest airport in the country. The airport is a major hub for two of the largest US carriers, United Airlines and American Airlines, which further contributes to its high passenger traffic. It features four passenger terminals, each equipped with a wide range of amenities, including dining options, shopping outlets, and lounges.

O’Hare International Airport boasts an extensive cargo operation, handling a significant volume of airfreight annually. Its strategic location and advanced cargo infrastructure have established it as a crucial cargo hub for the Midwest region. The airport continuously invests in infrastructure development and modernization projects to enhance passenger experiences and accommodate the growing demand for air travel. Additionally, O’Hare is well-connected to the city of Chicago through various ground transportation options, including the “L” train system, buses, and taxis, making it convenient for passengers to access the airport from downtown and surrounding areas.

5. Los Angeles International Airport (LAX)

Los Angeles International Airport (LAX), situated in Los Angeles, California, is another major player in the realm of US aviation. As the fifth busiest airport in the country, LAX handled approximately 23,663,410 passengers in 2021. Serving as a significant gateway to the Pacific Rim and connecting travelers to numerous domestic and international destinations, LAX plays a crucial role in global air travel. The airport is a major hub for several airlines, including American Airlines, Delta Air Lines, and United Airlines, offering a vast network of flights to various destinations around the world.

LAX features nine passenger terminals, each designed to accommodate a diverse array of amenities, shops, restaurants, and lounges to cater to the needs of its extensive passenger base. The airport has been investing in infrastructure improvements, including the modernization of terminals, the expansion of taxiways, and the enhancement of security measures, to ensure seamless and efficient travel experiences. Additionally, LAX is an essential hub for cargo operations, facilitating the transportation of goods between the United States and international markets. The airport’s proximity to the entertainment industry and the bustling city of Los Angeles contributes to its significance as a cultural and economic gateway for travelers and cargo alike.

6. Charlotte Douglas International Airport (CLT)

Charlotte Douglas International Airport (CLT) serves as a vital transportation hub for the southeastern United States. Located in Charlotte, North Carolina, it is the sixth busiest airport in the nation, handling around 20,900,875 passengers in 2021. CLT is a major hub for American Airlines, providing extensive domestic and international flight connections, making it a popular choice for travelers flying within the US and beyond. The airport’s central location along the East Coast contributes to its strategic importance in the national aviation network.

With its excellent passenger facilities and customer service, Charlotte Douglas International Airport offers a comfortable and convenient travel experience for millions of travelers each year. The airport has several passenger terminals with a variety of dining options, shops, and lounges, ensuring that travelers have access to all necessary amenities during their journey. Charlotte Douglas is actively engaged in various environmental sustainability initiatives, including energy-efficient infrastructure, recycling programs, and sustainable transportation options, aiming to minimize its environmental impact while continuing to support the region’s economic growth through air travel and cargo operations.

7. Orlando International Airport (MCO)

Orlando International Airport (MCO) is one of the busiest airports in the United States and is located in Orlando, Florida. As the primary airport serving one of the world’s most popular tourist destinations, MCO plays a crucial role in facilitating travel for millions of visitors to the numerous theme parks and attractions in the region, including Walt Disney World, Universal Studios, and SeaWorld. In 2021, the airport witnessed approximately 19,618,838 passengers boarding flights. MCO boasts four main terminals, with a wide range of amenities, shops, restaurants, and lounges, offering travelers a comfortable and enjoyable experience during their journeys.

The airport serves as a hub for Southwest Airlines, one of the major low-cost carriers in the country, which accounts for a significant portion of MCO’s air traffic. Additionally, it is a focus city for Frontier Airlines, further adding to its connectivity options. MCO operates an extensive network of domestic and international flights, connecting passengers to destinations across the United States, as well as to major cities in Central and South America, Europe, and beyond. To accommodate the growing demand for air travel, Orlando International Airport continues to undergo expansion and modernization efforts, including improvements to its infrastructure, runways, and passenger facilities.

8. Harry Reid International Airport (LAS)

Harry Reid International Airport (commonly known as Las Vegas McCarran International Airport or LAS) serves as the primary airport for Las Vegas, Nevada, one of the world’s most renowned entertainment and resort destinations. LAS is the eighth busiest airport in the United States, handling around 19,160,342 passengers boarding flights in 2021. The airport consists of two terminals, Terminal 1 and Terminal 3, each offering a wide array of services and amenities to cater to the needs of travelers.

As a focus city for Southwest Airlines and a hub for Allegiant Air, LAS provides extensive domestic connectivity, with numerous flights to cities across the United States. Additionally, the airport serves as an important gateway for international visitors, facilitating flights to and from destinations in Canada, Mexico, Europe, and Asia. LAS is well-known for its unique architectural design, featuring a large canopy and a vibrant light display over the terminal, known as the “McCarran Illuminated.” It also offers a variety of dining options, shops, and entertainment facilities, making it more than just a transit point but a destination in itself.

9. Phoenix Sky Harbor International Airport (PHX)

Phoenix Sky Harbor International Airport (PHX) is a major aviation hub located in Phoenix, Arizona. As the ninth busiest airport in the United States, PHX handled approximately 18,940,287 passengers boarding flights in 2021. The airport consists of three terminals: Terminal 2, Terminal 3, and Terminal 4. Terminal 4, the largest and busiest terminal, hosts a wide range of airlines and flights, offering an array of services and amenities to accommodate the needs of travelers.

PHX serves as a hub for American Airlines, providing extensive connectivity to various destinations across the United States and beyond. Additionally, it serves as a focus city for Southwest Airlines, further enhancing its domestic flight options. The airport’s strategic location makes it an essential connecting point for travelers flying between major cities in the Western United States and popular tourist destinations in Mexico and Central America. Phoenix Sky Harbor is well-regarded for its efficient and passenger-friendly facilities, including restaurants, shopping areas, rental car services, and excellent transportation options to and from the airport.

10. Miami International Airport (MIA)

Miami International Airport (MIA) is a major international gateway located in Miami, Florida, and serves as the primary airport for the vibrant Miami metropolitan area. It is the tenth busiest airport in the United States, handling around 17,500,096 passengers boarding flights in 2021. MIA is renowned for its strong connections to Latin America and the Caribbean, making it a significant hub for travelers between the United States and these regions.

As a hub for American Airlines, MIA offers a vast network of domestic and international flights, connecting passengers to major cities around the world. It is also a focus city for Frontier Airlines, expanding its range of domestic destinations. The airport boasts several modern and well-designed terminals, each with a variety of dining options, shops, lounges, and other amenities to ensure a pleasant travel experience. Due to its location in the southeastern United States, Miami International Airport is an essential gateway for international tourists visiting Florida’s numerous attractions, beaches, and cultural hotspots. The airport continues to see steady growth and improvements to accommodate the increasing number of passengers and to maintain its status as one of the country’s most significant aviation hubs.

What Factors Contribute to an Airport Being Considered the Busiest in the Us?

Several factors contribute to an airport being considered the busiest in the United States. These factors are essential indicators of an airport’s overall volume of passenger traffic and aircraft movements. The key factors include:

1. Passenger Traffic: The total number of passengers boarding flights at an airport is a primary factor in determining its busyness. Airports with a higher volume of passenger traffic are likely to be classified as the busiest in the US. Large metropolitan areas, tourism hotspots, and major business centers often have airports that witness significant passenger numbers.

2. Aircraft Movements: The number of takeoffs and landings (aircraft movements) is another critical metric in assessing an airport’s busyness. Airports with a high frequency of flights are indicative of heavy air traffic and demand.

3. Connectivity: The extent of domestic and international flight connections offered by an airport is a crucial factor. Busy airports typically have a wide network of routes, connecting passengers to various cities and countries globally. They serve as major hubs for multiple airlines, offering numerous flight options.

4. Hub Operations: Airports that function as major hubs for airlines experience a higher volume of passenger traffic due to the concentration of connecting flights. These hub airports facilitate seamless travel between different destinations, attracting more passengers and contributing to their busyness.

5. Location: The geographical location of an airport can significantly impact its busyness. Airports located in densely populated regions, popular tourist destinations, and major economic centers tend to have higher passenger volumes.

6. Infrastructure: The size and capacity of an airport’s infrastructure, including the number of runways, terminals, gates, and other facilities, play a vital role in handling large volumes of passengers and aircraft.

7. Seasonal Factors: Certain airports experience seasonal fluctuations in passenger traffic due to vacation periods, holidays, and special events. Busyness may vary throughout the year based on these factors.

8. Cargo Operations: Busy airports often handle a substantial amount of cargo traffic in addition to passenger flights. The efficient movement of goods and packages contributes to an airport’s overall busyness.

9. Economic and Business Factors: Airports situated in regions with strong economic growth, vibrant industries, and active trade tend to see increased passenger activity and aircraft movements.

A combination of these factors influences an airport’s status as the busiest in the United States. The Federal Aviation Administration (FAA) and industry organizations regularly analyze these metrics to assess airport activity and rank them based on their busyness and significance in the national air transportation network.

Disclaimer: The above information is for general informational purposes only. All information on the Site is provided in good faith, however we make no representation or warranty of any kind, express or implied, regarding the accuracy, adequacy, validity, reliability, availability or completeness of any information on the Site.

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