The metro's daily average ridership came down to 24.2 lakh in October from 27.4 lakh in September, translating to a fall of around 11 per cent.
The Blue Line, considered the metro's busiest, lost over 30 lakh commuters, according to data shared by the Delhi Metro Rail Corporation (DMRC) in response to an RTI query by a PTI correspondent.
The 50-km corridor connects Dwarka to Noida. The metro currently has a 218-km network across Delhi-NCR.
Ridership on the Violet Line, which connects ITO to Faridabad, plunged by 11.9 lakh in October. The number of riders on the Red Line, from Dilshad Garden to Rithala, came down by 7.5 lakh.
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Ridership has come down several notches from the numbers observed in recent years, bucking a trend of rise on the back of the launch of newer sections.
In fact, in October 2016, the metro's daily average ridership was 27.2 lakh, despite a comparatively shorter operational route.
The revised fare structure is: up to 2 km -- Rs 10, 2 to 5 km -- Rs 20, 5 to 12 km -- Rs 30, 12 to 21 km -- Rs 40, 21 to 32 km -- Rs 50 and for journeys beyond 32 km -- Rs 60.
Till May, the metro transported around 28 lakh passengers daily. After the first phase of the hike in May, the metro lost nearly 1.5 lakh passengers per day in June as ridership dropped to 25.7 lakh.
In July and August this year, Delhi Metro witnessed daily average ridership of 26.6 lakh and 27 lakh respectively.
Last year, in July, August and September, the metro's daily average ridership figures were 26.9 lakh, 28.5 lakh and 28.4 lakh, respectively, reflecting a trajectory of sustained growth.
DMRC -- which had maintained the fare hike was essential to maintain financial as well as operational health -- said in a statement that the drop in ridership is not solely because of increase in fares.
Reacting to the report, it said the month of October had holidays owing to festivals such as Diwali, Chhath Pooja and Bhai Duj.
The Arvind Kejriwal-led AAP government had mounted stiff opposition to the hike, leading to a confrontation with the Centre.
"That many passengers have taken to other means of transport, thus increasing pollution and congestion on roads. Metro fare hike has not benefited anyone," Kejriwal tweeted today.
"Delhi Metro admits in its RTI response to PTI that its ridership decreased by 11% following a steep fare hike in October. Result of misplaced priorities by an unaccountable Board!" Kejriwal's media advisor Nagendar Sharma added.
"If need be I will raise the issue of fare hike at the Centre," he said.
His colleague, Union Minister of Housing and Urban Affairs Hardeep Singh Puri, had said earlier that the Centre was in no position to disregard the recommendations of a Fare Fixation Committee which had drawn up the revised fare list.
Delhi Congress chief Ajay Maken also weighed in with his view and said both the Kejriwal government and the Centre were responsible for the fall in ridership.