The Thailand aviation industry has slipped to third place in Southeast Asia's commercial airline seating rankings for two consecutive months, ceding the No. 2 spot to Vietnam as fuel cost pressures and off-season demand fluctuations force Thai carriers to trim domestic and international routes.
Why This Matters:
• Regional competitive erosion: Vietnam now outpaces Thailand with 7.4M airline seats versus Thailand's 6.9M — a 3% year-on-year decline for Thailand.
• Fuel cost squeeze: Middle East tensions and the US-Iran conflict pushed jet fuel prices higher, triggering flight cuts by Thai Airways and Thai AirAsia from May through June.
• Recovery timeline unclear: While the Civil Aviation Authority of Thailand (CAAT) pursues infrastructure upgrades and cost-relief measures, passenger growth targets remain flat at 126M annually through fiscal 2026.
Vietnam Overtakes Thailand in Capacity Race
According to OAG, the global aviation analytics firm, Vietnam climbed to second place in the ASEAN commercial aviation market in July with 7.4M scheduled seats, marking a 5.6% increase compared to the same month in 2025. Indonesia retained the top position with 10.9M seats (up 0.3%), while Thailand dropped to third with 6.9M seats — a 3% decline year-on-year.
Vietnam Airlines has now become the largest carrier in Southeast Asia by seating capacity, offering 2.81M seats in July alone. The airline's aggressive expansion into China and India routes, combined with steady domestic demand, enabled Vietnam's aviation sector to post double-digit growth rates through the first half of 2026.
In contrast, Thai Airways and budget operator Thai AirAsia both announced frequency reductions on intra-ASEAN, wider Asian, and European routes during the May–June period, citing elevated operational costs and weaker passenger bookings during the low tourism season. Don Mueang Airport, a hub for low-cost carriers, reported a 7.5% decline in August capacity, reflecting Thai AirAsia's pullback.
Fuel Costs and Geopolitical Shocks Drive Cuts
The primary catalyst for Thailand's capacity contraction is the sustained rise in Jet A1 fuel prices, amplified by ongoing Middle East instability and the US-Iran conflict. These geopolitical flashpoints disrupted global oil supply chains and pushed jet fuel quotations to multi-year highs, forcing airlines across Southeast Asia to recalibrate route economics.
Thai Airways responded by monitoring monthly booking trends and trimming flight frequencies on underperforming routes. The carrier's strategy prioritizes "quality growth" over volume, targeting a 7% passenger increase in fiscal 2026 and total revenue exceeding 200 billion baht. To bridge the capacity gap, the airline is leveraging an asset-light model, expanding codeshare partnerships both within and outside the Star Alliance network.
Additional headwinds include a global aircraft shortage, delaying fleet renewal for many carriers. Thai Airways' order of 45 Boeing aircraft will not begin delivery until 2027, though the airline plans to lease 32 Airbus A321neo jets starting in late 2025, along with widebody Airbus A350 and Boeing 787-9 aircraft. Until those planes arrive, Thai carriers face constrained ability to match Vietnam's rapid expansion.
Broader ASEAN Trends: Malaysia and Philippines Also Slip
Thailand is not alone in losing ground. Malaysia dropped to fourth place with 5.2M seats (down 8.3%), and the Philippines fell to fifth with 4.9M seats (down 4.1%). All three countries attribute capacity reductions to the same fuel-cost shock and subdued international demand.
Vietnam stands out as the region's fastest-growing market, with capacity surging 10% in August and the Civil Aviation Authority of Vietnam (CAAV) targeting 95M passengers in 2026, a 13% increase from 2025. In the first half of 2026 alone, Vietnam welcomed 26.2M international passengers (up 15.4%) and 18.7M domestic travelers (up 0.3%).
Impact on Residents and Travelers
Higher Ticket Prices: Reduced flight frequencies typically translate to less competition and higher average fares, particularly on popular routes to Japan, South Korea, and intra-ASEAN destinations. Passengers booking travel from Thailand may find fewer nonstop options and longer layovers.
Service Consolidation: Budget carriers are prioritizing high-yield routes, meaning secondary cities and regional airports may see service reductions or complete route cancellations. Travelers in Chiang Mai, Phuket, and Hat Yai should verify flight schedules well in advance.
Economic Ripple Effects: Aviation capacity directly correlates with tourism receipts. While Thailand recorded 145.1M total airport passengers in 2025, the growth rate is stagnating. Foreign tourist arrivals declined 7.23% to 32.9M in 2025, and the government is aiming for only 10% growth in 2026 — a modest target given pre-pandemic benchmarks.
Connectivity and Hub Status: Thailand's ambition to become the region's premier aviation hub by 2029 — with 120M annual passenger capacity at major airports — faces mounting competition. Suvarnabhumi Airport remains the third-busiest in Southeast Asia, but Vietnam's infrastructure investments and aggressive airline expansion threaten to erode Thailand's historical advantage.
Government Response and Infrastructure Plans
The Ministry of Transport and CAAT have launched a multi-pronged strategy to reclaim Thailand's aviation leadership. Key initiatives include:
• Cost-Relief Measures: Fee reductions and streamlined processes to lower airline operating expenses at Thai airports.
• Infrastructure Upgrades: Expanding terminal capacity, modernizing air traffic control systems, and deploying digital technologies to reduce flight delays.
• Safety and Training: Enhancing pilot and crew training programs to meet International Civil Aviation Organization (ICAO) standards. Thailand will host the ICAO Second Advanced Air Mobility 2026 (AAM 2026) conference, signaling its commitment to next-generation aviation.
• Aerothai's Digital Push: Aeronautical Radio of Thailand (Aerothai) forecasts 919,643 total flights in fiscal 2026 (October 2025–September 2026), a modest 1.64% increase. The state enterprise is investing in digital air traffic management to improve safety and reduce congestion.
However, these measures are long-term fixes. In the near term, Thai carriers must navigate the volatile fuel market and off-peak demand lulls without the fleet flexibility enjoyed by Vietnam's rapidly expanding airlines.
Looking Ahead: Recovery or Further Decline?
The outlook for Thailand's aviation sector hinges on three variables: stabilizing fuel prices, the pace of aircraft deliveries, and the return of robust international tourism. Thai Airways expects to meet its 200 billion baht revenue target for fiscal 2026, contingent on increased flight frequencies to China and India during the winter high season.
Airports of Thailand (AoT), the state operator managing six major airports, projects 126M passengers for fiscal 2026 — unchanged from the previous year. Through the first eight months of fiscal 2026 (October 2025–May 2026), AoT airports handled 91M passengers, up 2.76% year-on-year, and 552,119 flights, up 1.38%. These incremental gains suggest stabilization rather than dynamic growth.
Meanwhile, Vietnam's aviation sector continues to accelerate. The country's target of 25M foreign tourists in 2026 and its investment in new international routes position it as the region's most aggressive aviation market. Unless Thailand can expedite fleet renewal, reduce operational costs, and stimulate demand beyond the traditional high season, the gap between the two countries will likely widen.
For residents, investors, and frequent travelers, the message is clear: Thailand's aviation dominance in Southeast Asia is no longer assured, and the competitive landscape is shifting rapidly in favor of neighbors willing to invest and expand aggressively.
