Both routes will start on 24 May, with the 70-minute Teesside-Bristol service operating daily. The Derry service will initially run four times a week, moving to daily from late June.
The Teesside service will be Loganair’s seventh route from the northern airport since it returned there in February after a two-year absence. One-way fares to Bristol are from £49.99, including checked baggage.
Derry fares are from £44.99 one-way and will be operated by a 49-seat Embraer jet already based at City of Derry airport. The new route follows confirmation the Department for Transport will continue to fund the airline’s Derry-Stansted link.