Manning Gottlieb won the work in a head-to-head pitch against the incumbent, Swordfish Internet Marketing.
The move by Teletext sees the broadcaster consolidate its overall planning and buying account with Manning Gottlieb, which has held the above-the-line work since October 1996. Delaney Lund Knox Warren & Partners handles the creative account.
"It was felt that consolidating our on- and offline media would make practical sense and would give us continuity when implementing campaigns," Marc Bell, Teletext's director of marketing, said.
Earlier this year, DLKW launched an £8.5 million multimedia marketing campaign for Teletext Holiday's web and digital television services.
It included four 30-second TV ads, a similar number of radio treatments, an online push and magazine wraps.