The system is operated by Incheon Transit Corporation, and is part of the greater Seoul Metropolitan Subway.

[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.

A trip along the line from Gyeyang in the north to International Business District in the south takes approximately 57 minutes.

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.

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.