The revenue-share agreement sees ebookers become Lycos' flight partner.
It will supply a white-label search engine service in the flights section of the portal that will allow users to find the lowest possible fares on specific destinations.
Alex Kovach, managing director of Lycos UK & Ireland, said: "Partnering with ebookers is part of Lycos UK's broader strategy to work with big brands that offer quality products and services that genuinely appeal to our net-savvy users."
Ian Carter, managing director of ebookers UK, said: "Lycos' user base has a high propensity to shop online. This presents ebookers with a great audience for our flight offers."
The Lycos travel channel has also recently signed deals with Online Travel Group, which will provide the portal's users with car and ferry travel offers, Euro Relais, which will offer European cottages, and Web Weekends, which will supply city breaks.