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British Airways, Iberia and Vueling parent company International Airlines Group saw a 8.7% jump in premium traffic during the peak summer month of August.
Overall carryings rose by a similar amount over the same month last year as capacity increased by 9.5%.
The buoyant figures follow Ryanair announcing a 400,000 jump in August passenger numbers to 9.4 million.
IAG said Iberia had resumed flights between Madrid and Montevideo as well as Santo Domingo on Monday.
The Spanish airline is offering four weekly services to the Uruguayan capital and five flights per week to the capital of the Dominican Republic.
Iberia operates more than 200 weekly flights between Madrid and 16 destinations in Latin America.
EasyJet followed the upward trend by reporting an 8.4% hike in passengers carried in August to 6.6 million with an improved load factor of 94.2%.
The UK budget carrier’s rolling annual total of passengers reached almost 64.4 million, up 6.4%.
Aer Lingus carryings in August rose by 7% to 1.2 million, with long-haul numbers up by 22% to 148,000, short-haul by 3.3% to 913,000 and regional by 19% to 144,000.
Scandinavian low-cost airline Norwegian’s August carryings were up by 19% to 2.3 million passengers as capacity rose by 37%.
Chief executive Bjørn Kjos said: “The fact that an increasing number of customers outside of Scandinavia choose to fly with Norwegian, proves that our international strategy is working.
“The August figures are also influenced by major holiday traffic outside of Scandinavia, particularly out of the UK, where Norwegian has a considerable operation.”