TAP Portugal is adding an extra three flights a week between Manchester and Lisbon.
The current service of seven weekly flights will increase to ten from 1 June.
The move means TAP Portugal will now provide 80 flights each week between the UK and Portugal.
At the end of last year, TAP announced a "commercial co-operation" agreement with Emirates that included a reciprocal code-share agreement and the linking of the two carriers' frequent flyer programmes.
The agreement allows passengers to purchase single tickets for connecting TAP Portugal and Emirates services, as well as enabling members of the TAP Victoria and Emirates Skywards loyalty schemes to earn and redeem miles when flying on either carrier.