The company has also seen its load factor rise by 2.3 percentage points, year-on-year, reaching 80.3%.
Vueling carried 1,742,711 passengers in July 2012.
The airline said it was continuing to expand its route network, with the introduction of two new routes between Barcelona and two new destinations in Algeria, Alger and Oran.
ASK (available seat-kilometre): number of seats flown multiplied by the number of kilometres flown
RPK (revenue passenger kilometre): number of passengers carried multiplied by the number of kilometres flown