Balkan Holidays has committed to running holiday flights from Southend airport to Bourgas next summer.
The operator is to run a series of flights to serve Bulgarian Black Sea resorts on Mondays between June 17 and September 2.
Bookings are available with a £49 deposit with balances to be paid 10 weeks prior to departure.
The move comes as a boost to the Essex airport after its owner Esken, formerly Stobart Group, confirmed last month that it had been put up for sale after struggling to recover from closure during the pandemic and the loss of Ryanair and Wizz Air.
EasyJet is currently the only airline running regular services from Southend.
Airport chief executive John Upton said: “We are delighted to be working with our new tour operator partner Balkan Holidays, launching another new route from London’s quick and easy airport.
“People living in London, Essex and across the southeast of England can choose this destination for summer 2024 and travel to us, by train, within 43 minutes from London Stratford.
“This announcement is further assurance of our commitment to rebuilding London Southend airport and a great example of our growth opportunity. We are confident that there is more to come for summer 2024.”
Chris Rand, Balkan Holidays marketing manager, added: “Our holidays to the beautiful Black Sea coast of Bulgaria are very popular so we are thrilled to be offering flights from London Southend airport for summer 2024.”