EasyJet saw a 10% jump in passenger carryings in June with an improved load factor.
The UK budget carrier flew more than 6 million passengers last month at a load factor more than two percentage points up year on year at 92%.
The rise gave the airline a rolling annual total of carryings up by 5.4% to more than 63 million.
The World Cup in Brazil helped boost numbers at British Airways and Iberia parent company International Airlines Group in June with passengers up by 8.8% to 7.1 million over June 2013.
Overall premium traffic was up by 4%.
“June figures are impacted by World Cup effects, especially in Latin America,” IAG said.
Aer Lingus carryings in June were up by 4.9% to 995,000, helped by a 21.5% rise in long-haul passengers to 141,000.
Ryanair’s June carryings rose by 5% or 400,000 to 8.3 million with the load factor improving by four percentage points to 88%.
Rolling annual carryings rose by 3% to 82.7 million.
Chief marketing officer Kenny Jacobs attributed the increase to lower fares and the carrier’s improving customer experience, including a new website, allocated seating and the ability to take a free second small carry-on bag.
“Ryanair continues to deliver so much more than just the lowest fares in every market for our 82.7m customers,” he said.