WestJet Airlines Ltd. says its flights in August took off with the lowest percentage of empty seats in the airline's history.

The Calgary-based airline reported an all-time record load factor of 88.9 per cent for August, up from 83.3 per cent a year ago.

Revenue passenger miles, or traffic, increased 9.2 per cent year over year, while capacity, measured in available seat miles, grew 2.3 per cent.

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WestJet president and CEO Gregg Saretsky says demand remains strong and the airline is seeing growing contribution from its code-share and interline partners.

The airline said it flew nearly 172,000 more passengers in August compared with a year ago.

Meanwhile, Porter Airlines reported an August load factor of 74.5 per cent, up from 68.7 per cent a year ago.