IAG said operating profits had fallen by 3.5% to £1.08 billion in the three months to the end of September, while revenue before exceptional items was down by 4% to £5.2 billion.
Willie Walsh, IAG chief executive, said: "We’re reporting a strong quarter three operating profit before exceptional items of €1,205 million.
"While strong, these results were affected by a tough operating environment with a very significant negative currency impact of €162 million, primarily due to sterling weakness, and continued disruption due to air traffic control strikes.