The FTSE 100-listed firm said it carried 8.4mln passengers last month, up 7.7% from the 7.8mln carried in November 2017.
The group - which owns British Airways, Ireland’s Aer Lingus and Spanish carriers Iberia and Vueling – added that passenger growth in the year-to-date was 7.6% to 104.6mln, up from 97.2mln at the same stage a year earlier.
IAG’s group traffic, measured in revenue passenger kilometres, rose by 6.7% to 20.7mln, up from 19.4mln in November last year.
It added that group traffic in the year-to-date was up 6.9% to 249.6mln from 233mln last year.
The company said capacity, measured in available seat kilometres, grew by 7.1% in November to 25.7mln, while year-to-date group capacity was up 5.8% to 298.6mln.
IAG’s load factor in November was flat year-on-year at 80.7%.
The group said all its airlines achieved growth in traffic with Iberia being the top performer.