Delta Air Lines Inc., bowing to pressure from the strong dollar and lower travel demand from oil-dependent economies, on Wednesday said it would cut its overseas capacity by 3% this winter—or a 6% reduction from prior plans.

The biggest year-over-year cuts will come on routes to Japan, Brazil, Africa, India and the Middle East, it said, along with the seasonal suspension of service to Moscow. The company said those moves, which will result in flat capacity overall in the fourth quarter, should help return its unit-revenue performance to growth after several quarters of declines.