Stretching the Runway: Changi Airport’s Expansion Strategy

Rushil Srinath, Charmaine Khor and Luei En Le
2 days ago
8 min read

In this Explainer, find out...

What are the main goals of Changi Airport’s expansion plans?
How does the upgrade and expansion contribute towards Singapore’s broader national economic and sustainability strategy?
What are some challenges that might arise in the expansion of airport facilities, and how will they be managed?

Introduction

Sometimes, even the world’s best airports run out of room.

That is the challenge facing Changi Airport today. After years of post-pandemic recovery, passenger traffic is rising again, hitting a 12-month high in April 2026. This puts pressure on terminals, transport links and passenger-processing systems. To prepare for long-term growth, Singapore is building Terminal 5, a major expansion that will eventually handle around 50 million passenger movements a year and raise Changi’s total capacity to over 140 million passengers annually from the current 90 million.

However, there is one challenge: Terminal 5 is a long-term strategic investment and is not expected to be operational until the mid-2030s. How, then, can Changi Airport continue to accommodate rising travel demand over the next decade without waiting for Terminal 5 to be built?

The answer lies in a two-pronged capacity expansion strategy. In the short to medium term, the expansion of Terminal 3 is intended to address immediate capacity constraints and support continued passenger growth. In the longer term, Terminal 5 will provide a substantial increase in capacity required to meet future demand and reinforce Changi Airport’s position as a leading global aviation hub. Together, these complementary initiatives enable Changi to meet growing passenger demand both now and in the decades ahead.

The expansion of both Terminals 3 and 5 forms part of Changi Airport Group’s broader, six-year S$3 billion enhancement plan from 2025–2030. The plan aims to upgrade the existing infrastructure, raise passenger-handling capacity, and ensure Changi remains competitive before Terminal 5 is completed in the mid-2030s. By improving Terminal 3’s facilities and operations, Changi can better manage rising air travel demand in the coming decade. This, in turn, improves Singapore’s overall competitiveness, maintaining its status as a premier global aviation hub.

This Policy Explainer aims to explain three key points. Firstly, it considers what the main goals of Changi Airport’s expansion plans for Terminals 3 and 5 are. Secondly, it explores how the upgrades and expansions fall under Singapore’s broader national economic and sustainability strategy. Thirdly, it surveys the potential challenges that might arise in the expansion of airport facilities.

A New Terminal 3

Let us begin by exploring the importance of Terminal 3, how it differs from other terminals and why it is crucial to expand it.

Changi Airport’s Terminal 3

Terminal 3 stands out as one of Changi’s most recognisable “gateway” terminals. This is because of its alignment with Singapore’s “Garden City” identity, given its five-storey Green Wall, indoor gardens and natural lighting.

Furthermore, like the other three terminals, Terminal 3 also plays a pivotal role in helping Changi Airport handle growing international travel demand and strengthening Singapore’s role as a global aviation hub. Terminal 3 was specifically built to expand Changi Airport’s passenger capacity due to the increasing number of passengers moving through the airport in the mid 2000s.

The rationale behind expanding Terminal 3

When built in 2008, Terminal 3 had the capacity to handle 22 million passengers per annum, which was around one-third of the 70 million passengers per annum capacity of the airport then. Today, however, the same capacity represents only around one-fourth of Changi’s 90 million passenger capacity. This underscores the need to upgrade Terminal 3 to keep pace with airport-wide passenger growth.

Furthermore, the expansion of Terminal 3 will directly improve throughput, which refers to the speed and efficiency with which passengers are processed. This leads to shorter bottlenecks, hence improving passenger experience.

The need to improve throughput is driven by rising passenger traffic. As more passengers pass through the airport, existing facilities face greater pressure, which can slow down processes such as check-in, immigration, security screening and baggage handling. From January to March 2026, total passenger movements reached 17.61 million, an increase of 1.19 million passengers, or approximately 7.3 per cent, compared with the same period in 2019. Key reasons for the growth include Changi’s expanded connectivity and an increase in broad-based travel from foreign countries, primarily in Asia.

Upgrading Terminal 3’s Facilities

Currently, Changi Airport Group (CAG) is executing a broader S$3 billion investment dedicated to rejuvenating Terminals 1 through 4. Following the successful overhaul of Terminal 2 in 2023, Terminal 3 is next in line for major facility upgrades. With a tender slated for the second half of 2026, construction is expected to begin by the end of the year.

This upgrading will see a greater integration of digital technologies in security screenings and self-check-ins. Terminal 3 will serve as a testing ground for these new technologies before they are rolled out on a larger scale in Terminal 5. Other than automation features, airside capacity will be expanded to minimise congestion and reduce boarding times. On the ground, the number of bus gates will increase from three to seven.

Construction of Terminal 5

Beyond Terminal 3, the cornerstone of Changi Airport’s expansion plans is the new Terminal 5. This terminal is slated to be fully operational by the mid-2030s. Terminal 5 will help Changi Airport achieve its goal of reaching more than 200 city-links, improving Singapore’s connectivity to the world. At the same time, national carrier Singapore Airlines and its budget arm Scoot will consolidate their operations in Terminal 5 on its completion.

The Terminal 5 project will be further complemented by the development of the Changi East Urban District, a future lifestyle hub. With a large number of projects in the making, the Changi East development is expected to be a vibrant ecosystem for businesses.

Broader Economic and Sustainability Strategies

Having canvassed the expansion of Terminal 3 and construction of Terminal 5, we will now consider how both projects contribute towards Singapore’s economic and sustainability strategies.

Economic Positioning

To begin with, the expansion plans highlighted above will contribute towards Singapore’s economic strategy. The aviation industry is a vital part of Singapore’s economy, contributing approximately five per cent to the nation’s Gross Domestic Product (GDP). Aviation is also the lifeblood of Singapore’s tourism industry, with air transport supporting thousands of jobs across dining and retail. Changi Airport’s expansion plans are expected to allow the aviation industry to contribute even more to the economy, as well as the tourism industry. Tourism revenue is projected to increase from S$29.8 billion in 2024 to S$47–50 billion in the next 15 years.

The expansion plan aims to capitalise on the Asia-Pacific region’s status as the fastest-growing air travel market, given that it is currently experiencing the fastest passenger growth in the world. By scaling capacity now, Singapore is on track to capture surging demand from the Asia-Pacific region. It also protects Singapore’s market share (the percentage of international travellers that Changi Airport serves in relation to the world) from competition posed by regional aviation hubs, such as Hong Kong and Kuala Lumpur. These competitors have already completed or announced major airport upgrades, further necessitating upgrades on Singapore’s part.

Sustainability and Decarbonisation

Moreover, the expansion of Changi Airport will also contribute towards the national environmental agenda. Changi Airport’s expansion plans are deeply tied to Singapore’s Sustainable Air Hub Blueprint and the Singapore Green Plan 2030. Together, these frameworks set out clear environmental targets for the aviation industry. Particularly, the expansion has great potential to drastically reduce the domestic carbon footprint of Singapore’s aviation industry.

Under the broader Singapore Sustainable Air Hub Blueprint, there is a target that aims for a 20 per cent reduction in domestic aviation emissions from airport terminal and ground support operations. Building Terminal 5 from the ground up allows for sustainability to be embedded within the terminal’s infrastructure. Terminal 5 is designed to meet the BCA Green Mark Platinum Super Low Energy standard, meaning that it will be highly energy-efficient. As for the rest of the existing terminals, energy is also actively being improved via solar power deployment. Large strides have already been made, with the completion of Singapore’s largest single-site rooftop solar system across terminal buildings in 2025.

Under the Singapore Green Plan, Singapore aims to play an important role in contributing towards the International Civil Aviation Organisation’s goal for international aviation to reach net zero carbon emissions by 2050. To support this goal, Terminal 5 will be positioned to adopt Sustainable Aviation Fuel (SAF) to reduce greenhouse gases and environmental impact. Starting 2026, Singapore will require a mandatory one per cent SAF blend departing from Changi Airport, with goals to scale to three to five per cent by 2030.

Risks, Trade-offs and Mitigations

Changi’s expansion strategy is bold and fits Singapore’s long-term economic plans. However, it still comes with trade-offs that need to be managed. In this section, three key risks will be explored:

operational disruption;
economic and competitive pressure; and
the environmental and sustainability gap.

Operational Disruption

One key risk is upgrading Terminal 3 while the airport is already close to its 90 million passenger capacity. Phased construction and off-airport check-in help reduce disruption, but they cannot remove the stress of rebuilding a live terminal that handles about 70 million passengers a year. Unexpected issues, such as finding asbestos, can still delay work and push up costs.

Furthermore, Terminal 3 is being used as a testbed for robotics and artificial intelligence. On the one hand, this is a sensible way to prepare for Terminal 5, given that it allows new systems to be tested and refined early. On the other hand, however, trying out unproven technology in a busy terminal can create short-term uncertainties for airport staff and passengers.

Economic and Competitive Pressure

There are also limits to how far higher capacity can translate into higher traffic. By 2030, airport fees at Changi are set to rise to S$79.20, compared to around S$30 at Kuala Lumpur International Airport and Bangkok’s Suvarnabhumi Airport. To respond, Changi is positioning Terminal 5 as a premium but easy-to-navigate terminal, while deepening cargo partnerships and adding more direct links to secondary cities in India and China. These moves strengthen Singapore’s role as a hub, but they may not fully overcome the pull of cheaper regional competitors for budget-conscious travellers.

The Environmental and Sustainability Gap

Finally, there is a clear tension between expansion and environmental goals. On the one hand, as noted above, the plans support national efforts under the Sustainable Air Hub Blueprint and the Singapore Green Plan 2030. Terminal 5 will be built to Green Mark Platinum Super Low Energy standards, with district cooling and large-scale solar panels, while other terminals are also becoming more energy efficient. On the other hand, raising capacity to serve over 140 million passengers sits uneasily with the target of net-zero emissions by 2050.

Requiring all departing flights to use at least one per cent SAF from 2026, rising to three to five per cent by 2030, and introducing a levy to stabilise costs, are important steps. However, SAF made up less than one per cent of global jet fuel use in 2025, so supply and affordability remain major constraints. The cost of flying through Changi may rise, affecting its competitiveness as a global aviation hub. As a result, the current measures narrow, but do not close, the gap between growth and sustainability.

Taken together, it appears that Changi’s expansion is a strategic bet that comes with real operational, economic and environmental risks, rather than a risk-free upgrade.

Conclusion

Changi Airport’s expansion shows how Singapore is planning ahead for rising air travel. By upgrading Terminal 3 and investing in Terminal 5, the strategy seeks to ease current bottlenecks, raise capacity and protect Singapore’s position as a leading aviation hub in the Asia-Pacific region.

At the same time, the expansion is closely tied to national economic and sustainability priorities. Stronger connectivity and higher tourism receipts are expected to support long-term growth, while energy-efficient terminal design, solar power deployment and the adoption of SAF contribute towards national decarbonisation targets, including net-zero emissions by 2050.

However, the trade-offs identified remain significant. Operating major works in a live terminal, facing regional competition from lower-cost hubs and managing the tension between capacity growth and environmental commitments will require constant adjustment. How these challenges are handled will shape whether Changi’s expansion ultimately delivers on its promise of both progress and sustainability.

This Policy Explainer was written by members of MAJU. MAJU is a ground-up, fully youth-led organisation dedicated to empowering Singaporean youths in policy discourse and co-creation.

By promoting constructive dialogue and serving as a bridge between youths and the Government, we hope to drive the keMAJUan (progress!) of Singapore.