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Line 1 is a 30.3-kilometer (18.8 mi) north-south subway line.^[2] After six years of construction, the line opened for regular service on October 6, 1999 as the fourth subway system in South Korea, after Seoul, Busan, and Daegu. Transfers to the Seoul Metropolitan Subway can be made via Bupyeong Station to Seoul Subway Line 1, as well as the Suin Line to Seoul at Woninjae Station. A trip along the line from Gyeyang in the north to International Business District in the south takes approximately 57 minutes. The color of the line is light blue.

A one-station extension to Gyeyang opened in March 2007, providing transfers to AREX. A six-station south extension opened in June 2009.

The line uses 34 8-car trains. The first 25 trains were built between 1998 and 1999 by Daewoo Heavy Industries and Rotem, while the last 9 trains were built between 2007 and 2008 by Hyundai Rotem to provide trains following the extension of the line.

Line 2 is a 29.1-kilometer (18.1 mi) north-south light metro line. After seven years of construction, the line opened for regular service on July 30, 2016. There are transfer points at Geomam (with AREX), Juan (with Seoul Subway Line 1), and Incheon City Hall (with Incheon Line 1). Line 2 has aboveground sections north of Asiad Stadium. The color of the line is Orange.

The line uses 37 2-car trains, all of which were built in 2013 by Hyundai Rotem.

Line 7 on the Seoul Subway was extended beyond Onsu Station with 9 additional stations beyond Seoul City and into Incheon on October 27, 2012. The 10.2-kilometer (6.3 mi) extension had ended at Bupyeong-gu Office Station, meeting Incheon Subway Line 1. On May 22, 2021, Line 7 was extended deeper into Incheon with the opening of the 3.94-kilometer (2.45 mi) extension to Seongnam. The section of the line in Incheon and Bucheon Cities are operated by Incheon Transit Corporation with their own fleet of Incheon Transit Corporation SR000 series trains, and both fleets through service into each other's portion of the line. Future plans call for the relevant portion of the line to extended all the way to Cheongna International City station, with transfers available to AREX.

The future Line 3 is planned to be a circular line of the Incheon Subway. It will intersect Seoul Subway Line 1 at Dowon Station and Incheon Subway Line 1 at Dongmak Station. The color will be Light Green.

Juan Songdo Line is a 14.1-kilometer (8.8 mi) long tram line proposed by Incheon City. Construction starts in 2028 and aims to operate in 2033.^[3] The vehicle will be operated with one vehicle (5 modules) of streetcar vehicles and can accommodate 48 seats and 171 standing seats. It will be operated with 12 vehicles, and the driving time at the peak is 4.5 minutes.There are transfer points at Juan (with Seoul Subway Line 1), (with Incheon Subway Line 2), Citizens Park (with Incheon Subway Line 2), Inha University, Hagik, Songdo (with Suin-Bundang Line), and Incheon National University (with Incheon Subway Line 2)^[4]