Ryanair increased passenger numbers by 4% to 13.1 million in July despite experiencing more than 1,000 flight cancellations during the month.
The airline says the rise in traffic was achieved even though 200,000 of its customers had their flights cancelled due to adverse weather and "unnecessary" pilot and cabin-crew strikes across Europe.
Load factors held steady at 97%.
Rolling annual traffic to July grew 7% to 133.5 million passengers.
Ryanair’s chief marketing officer Kenny Jacobs says the growth was achieved "on the back of lower fares".