Keep in mind that EF can only show you the base fare. Taxes and airline (e.g., fuel) surcharges are extra and will depend on the specifics of your route. Also, the airline that tickets will charge higher or lower surcharges. Also be aware that if stopping in the U.K. for more than 24 hours, you will have to pay the
APD, which is
172 GBP when flying outside of Europe.