Map - Bandaranaike International Airport (Bandaranayake International Air Port)

Bandaranaike International Airport (BIA) (බණ්ඩාරනායක ජාත්‍යන්තර ගුවන්තොටුපළ; பண்டாரநாயக்க சர்வதேச விமான நிலையம்) (commonly known as Colombo International Airport, Colombo–Bandaranaike and locally as Katunayake Airport) is the main international airport serving Sri Lanka. It is named after former Prime Minister S. W. R. D. Bandaranaike (1899–1959) and is located in a suburb of Negombo, 32.5 km north of the nation's longstanding capital and commercial center, Colombo. It is administered by Airport and Aviation Services (Sri Lanka) Ltd and serves as the hub of SriLankan Airlines, the national carrier of Sri Lanka, and domestic carrier Cinnamon Air. The other airport serving the city of Colombo is Colombo International Airport, Ratmalana.

The airport began as a Royal Air Force airfield in 1944 during the Second World War, RAF Negombo with No. 45 Squadron RAF (1946–49), No. 232 Squadron RAF (1945), No. 249 Squadron RAF (1950) and No. 1303 Flight RAF (1945–46). In 1957, Prime minister S. W. R. D. Bandaranaike removed all the British Military airfields from Ceylon (Sri Lanka), and the airfield was handed over to the Royal Ceylon Air Force (RCyAF) and renamed Katunayake; part of it still remains a military airfield. In 1964 Anil Moonesinghe, the Minister of Communications, started the building of a new international airport to replace Ratmalana, with Canadian aid. The airport was completed in 1967, and Air Ceylon, the national carrier, began international operations from it using a Hawker Siddeley Trident and a leased British Overseas Airways Corporation (BOAC) British Aircraft Corporation (BAC) VC-10. It was named after former Prime Minister SWRD Bandaranaike, in 1970. It was renamed Katunayake International Airport in 1977, but was changed back to Bandaranaike International Airport in 1995.

On 7 November 1971, the first Boeing 747 landed at the airport. The Boeing 747-200B was operated by Condor carrying German tourists from Frankfurt. In the early 1990s the position of the airport's runway (04/22) was shifted northward and the old runway was made into a taxiway for departing and arriving aircraft. Airport expansion projects have recently been undertaken at the airport under the Stage 1, Phase II Expansion Project. A pier with eight aero-bridges opened in November 2005. A new terminal with an additional eight gates are proposed to be built under Stage II of the Phase II Expansion Project. Construction of the new Stage II, Phase II Expansion Project is expected to commence in April 2017 and is expected to be completed by 2020.

On 7 May 2007, the Sri Lankan Government shifted military aviation operations out of the space adjoining the airport to SLAF Hingurakgoda, thus paving the way for the expansion of civilian operations. As part of the airport development program, a passenger train service was launched between the Airport and Colombo Secretariat Station, in June 2010. The airport is used by Emirates as an alternative emergency airport for its Airbus A380 aircraft. On 9 January 2012, an Airbus A380-800 operated by Emirates landed at Bandaranaike International Airport. This was the first time in history that an Airbus A380 had landed in a Sri Lankan airport.

SriLankan Airlines is the largest airline operating at the airport, with a fleet of 27 Airbus aircraft.

In the past, British Airways, KLM, Kuwait Airways, LTU International, Royal Jordanian Airlines, Saudia and Swissair are the airlines that previously served Colombo for many years.