Indonesia continues to dominate the Southeast Asian aviation market with scheduled flight capacity reaching 10.8 million seats in September 2026, a 7.3 percent increase from the previous year (Source: Official Airline Guide OAG).

This growth is powered by domestic demand, With 8.7 million domestic seats, Indonesia holds the largest domestic market in the region, a figure that rose nearly 10 percent year over year. The expansion reflects both rising demand and the strategic importance of air travel in linking diverse economic centers across the islands.

The OAG data also highlights how Indonesia’s competitors are faring. Thailand’s capacity slipped slightly to 6.6 million seats, while Vietnam surged to 6.4 million seats with a 9.2 percent growth rate. Malaysia and the Philippines recorded declines, reinforcing Indonesia’s relative strength.

Airlines reflect this broader trend. Lion Air, Batik Air, and Citilink all rank among the top ten carriers in Southeast Asia. Citilink stands out with a remarkable 54 percent growth, adding nearly half a million seats in a single year. Batik Air also expanded significantly, while Lion Air contracted slightly, showing how competition within Indonesia’s own aviation sector is reshaping the balance of power.

Regionally, AirAsia remains the largest airline but has faced a sharp decline in capacity, signaling a shift in momentum toward full-service carriers and select low-cost operators that are adapting more effectively.

Infrastructure plays a critical role in sustaining this growth. Soekarno-Hatta International Airport ranks as the second busiest in Southeast Asia after Singapore’s Changi, with 3.24 million seats and a growth rate of 6.1 percent. Other Indonesian airports, including Bali’s Ngurah Rai and Makassar’s Hasanuddin, also feature in the region’s top ten, underscoring the country’s broad-based aviation footprint.

At the regional level, Southeast Asia’s overall flight capacity grew modestly by 2 percent to 48 million seats, driven primarily by domestic demand. International capacity rose only 0.7 percent, reflecting slower recovery in cross-border travel. Full-service airlines expanded their share to 56 percent of total capacity, while low-cost carriers contracted, a reversal of trends that had defined the market for much of the past decade.