[1] After serving the Indian National Congress in various capacities for more than 20 years, she quit to join the Aam Aadmi Party on 26 December 2014.

After one year in 1995, she contested the Delhi University Students' Union (DUSU) election for the post of President and won by a huge margin.

In 2003, she unsuccessfully contested Delhi Assembly elections from Moti Nagar Constituency against the senior BJP leader Madan Lal Khurana.

[16] In February 2015, Lamba contested Delhi Legislative Assembly election from Chandni Chowk constituency on Aam Aadmi Party's ticket.

Lamba had openly disagreed with the AAP leadership regarding the passing of a resolution in December 2018 to revoke former prime minister Rajiv Gandhi's Bharat Ratna.

[19] Lamba has visited the UK, Russia, the US, China, and Venezuela to attend seminars and give speeches about women's empowerment, human rights and sustainable development in third world nations.

In 2010, Lamba travelled across Brunei, Singapore, Bangladesh, Sri Lanka, Malaysia, and Maldives with the 2010 Delhi Commonwealth Games Queen's Baton Relay.

On 10 August 2015, a mob armed with lathis, swagger sticks and cricket bats attacked and badly vandalized a liquor shop located in the Kashmere Gate area of old Delhi.

[20] According to reports, this happened because the shopkeeper was a BJP supporter and had objected to the AAP defacing his shop windows with posters eulogising Lamba and her party.

[21][22] A non-governmental organisation named Go India Foundation run by Alka Lamba got attention in 2010 during its blood donation campaigning.