Three-quarters of the city’s subway lines are plagued by chronically late trains, and five lines are late more than 50 percent of the time, according to MTA data for the first three months of the year.

The city’s tardiest train is the 2 line, which was on time only 30.6 percent of the time during its weekday route from Wakefield to Flatbush, records say. That’s 44 percent below the NYC Transit’s on-time target of 75 percent.

Close behind were the 4/5 lines. The 4 ran on time from Woodlawn to Crown Heights only 32.7 percent of the time while the 5, traveling from Eastchester to Flatbush, was on time only 32.8 percent of the time between January and March, records show.

The 6 train was the fourth-slowest train in the city, arriving on time only 47.4 of the time, followed by the F train, which was punctual only 48.6 percent of the time.

Overall, trains arrived on time only 63.2 percent of the time, with commuters enduring an endless stream of delays, rerouting and power outages.

Only five of the city’s 23 subway lines ran consistently on time and three of them are shuttle lines with few stops.

The L train was the city’s most punctual, running on time between 8th Avenue and Canarsie at a 92.2 percent rate. The L is the only line with advanced signal technology allowing trains to run more closely together. But the MTA plans to suspend service between Brooklyn and Manhattan in 2019 to repair Sandy damage.