British Airways is raising frequency between Heathrow and Philadelphia from seven to ten flights a week.
Additional flights will run on Mondays, Fridays and Sundays with a 5pm departure time from London starting in April 2018.
The service is operated by new Boeing 787-8 Dreamliner aircraft in a three-class configuration.
Along with additional international flights, 2018 will also see a 20% increase in hotel capacity in the US east coast city, including a new Four Seasons, W and Element Hotels.