Air

The Chhatrapati Shivaji International Airport (formerly Sahar International Airport) is the main aviation hub in the city and the busiest airport in India in terms of passenger traffic. In 2007, it catered to over 25 million passengers. An upgrade plan initiated in 2006, targeted at increasing the capacity of the airport to handle up to 40 million passengers annually by 2010, is expected to be completed on time

The proposed Navi Mumbai International Airport to be built in the Kopra-Panvel area has been sanctioned by the Indian Government and will help relieve the increasing traffic burden on the existing airport.

The Juhu Aerodrome was India's first airport, and now hosts a flying club and a heliport.

Rail

Mumbai is the headquarters of two of Indian Railways' zones: the Central Railway (CR) headquartered at Chhatrapati Shivaji Terminus (formerly Victoria Terminus), and the Western Railway (WR) headquartered at Churchgate. The backbone of the city's transport, the Mumbai Suburban Railway, consists of three separate rail networks: Central, Western, and Harbour Line, running the length of the city, in the north-south direction.Mumbai's suburban rail systems carried a total of 6.3 million passengers every day in 2007, which is more than half of the Indian Railways daily carrying capacity. Trains are overcrowded during peak hours, with nine-car trains of rated capacity 1,700 passengers, actually carrying around 4,500 passengers at peak hours.

Mumbai Metro is an underground and elevated rapid transit system currently under construction. The Mumbai Monorail, currently under construction, will eventually run from Jacob Circle to Wadala

Mumbai is well connected to most parts of India by the Indian Railways. Long-distance trains originate from Chhatrapati Shivaji Terminus, Dadar Station, Lokmanya Tilak Terminus, Mumbai Central Station, Bandra Terminus, Andheri and Borivali.

Road

Mumbai is served by National Highway 3, National Highway 4 and National Highway 8 of India's National Highways system. The Mumbai-Pune Expressway was the first expressway built in India,while the Mumbai-Vadodara Expressway,Western Freeway and Eastern Freeway is under construction. The Bandra-Worli Sea Link bridge, along with Mahim Causeway, links the island city to the western suburbs. The three major road arteries of the city are the Eastern Express Highway from Sion to Thane, the Sion Panvel Expressway from Sion to Panvel and the Western Express Highway from Bandra to Borivali.

Mumbai's bus services carried over 5.5 million passengers per day in 2008. Public buses run by BEST cover almost all parts of the metropolis, as well as parts of Navi Mumbai, Mira-Bhayandar and Thane. Buses are generally favored for commuting short to medium distances, while train fares are more economical for longer distance commutes. The BEST operates a total of 4,013 buses with CCTV Camera installed, ferrying 4.5 million passengers daily over 390 routes.Its fleet consists of single-decker, double-decker, vestibule, low-floor, disabled-friendly, air-conditioned and Euro III compliant Compressed Natural Gas powered buses. Maharashtra State Road Transport Corporation (MSRTC) buses provide intercity transport and connect Mumbai with other major cities of Maharashtra and India. Navi Mumbai Municipal Transport (NMMT) also operate its Volvo buses in Mumbai, from Navi Mumbai to Bandra, Dindoshi and Borivali. The Mumbai Darshan is a tourist bus service which explores numerous tourist attractions in Mumbai. Mumbai BRTS (Bus Rapid Transit System) lanes have been planned throughout Mumbai, with buses running on seven routes as of March 2009. Though 88% of the city's commuters travel by public transport, Mumbai still continues to struggle with traffic congestion.Mumbai's transport system has been categorized as one of the most congested in the world.

Due to further aggravation of congestion on roads due to hawkers and parked vehicles, MMRDA has initiated the Mumbai Skywalks project to provide quick and safe pedestrian dispersal from highly congested areas such as Mumbai Suburban Railway stations to heavily targeted destinations.

Sea

Mumbai is served by two major ports, Mumbai Port Trust and Jawaharlal Nehru Port Trust, which lies just across the creek in Navi Mumbai. Mumbai Port has one of the best natural harbours in the world, and has extensive wet and dry dock accommodation facilities. Jawaharlal Nehru Port, commissioned on 26 May 1989, is the busiest and most modern major port in India. It handles 55–60% of the country's total containerized cargo.

Mumbai is the headquarters of the Western Naval Command, and also an important base for the Indian Navy.
Ferries from Ferry Wharf in Mazagaon allow access to islands near the city.