The additional seats will be added to the carrier’s services to Birmingham, Edinburgh, Leeds Bradford, Manchester and Glasgow.
With further capacity being introduced over the coming week, the airline will also bolster its summer 2023 schedule with 180,000 extra seats from Belfast.
Furthermore, the company will hold interviews on Thursday (2 February) and Friday (3 February) for those impacted by the the collapse of Flybe, which had a presence at Belfast City. Belfast-based roles include direct entry captains, co-pilots and cabin crew.
Conor McCarthy, executive chair of Emerald Airlines, which operates the Aer Lingus Regional franchise, said: "We are developing and executing a comprehensive plan to ensure the continuation of reliable, cost-effective and sustainable air travel from Belfast.
"Emerald Airlines is stepping up, safeguarding connectivity between Great Britain and Northern Ireland, as we have done for the past 12 months."