Delhi’s Indira Gandhi International Airport (IGIA) may soon have two international terminals. As the busiest airport in the country, the IGIA has three terminals, with Terminal 1 (T1) and Terminal 2 (T2) handling only domestic flights and Terminal 3 (T3) taking care of both domestic and international air traffic. But this may soon change with demands for making T1 an international terminal.
The operations are likely to expand with IndiGo, an Indian low-cost carrier, requesting Delhi International Airport Limited (DIAL) to develop the infrastructure that will facilitate international flight operations from T1 as well, according to media reports. DIAL is a consortium between GMR Group, Airport Authority of India, Fraport AG and Erman Malaysia that handles the operations of IGI Airport in the capital. At the moment, T1 is undergoing expansion, and by September 2023, it will be ready along with the fourth runway.
Tentative expansion of international terminals at Delhi Airport:

The current expansion was planned for only domestic flights, however, after the COVID-19 pandemic, a major increase in air travel was observed. This jump in air traffic forced authorities to consider T1 for international operations as well.
“T1 work will be completed as per the original plan to avoid any delay, given the rise in traffic and, then, clearance will be sought from multiple government agencies concerned to have facilities for international traffic at T1,” the Times of India quoted a source as saying.
Furthermore, there are plans to make T3 handle only Tata Group airlines — Air India, Air Asia India and Vistara — and foreign airlines. T1 will handle low-cost carriers, like IndiGo, and T2 will cater to only domestic flights, according to the TOI report.
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Frequently Asked Questions (FAQs)
Answer: At the moment, T3 is the only terminal that is managing international flights.
Answer: T1 may become an international terminal in the future if the authorities concerned permits it.