Orange Line, more popularly known as the Airport Express Line, was the first line of Delhi Metro built via a public–private partnership and intended to be operated privately. However, after Reliance Infra — the company with operational rights — admitted its inability to handle the operations, the management of the line was transferred to Delhi Metro Rail Corporation. Designed to radically cut down the journey time between the city’s two busiest transit hubs — Indira Gandhi International Airport and New Delhi Railway Station — the line has a top speed of 130 km/h, the highest across the metro system. However, the operational speed is restricted to 80 km/h, after once being reduced to just 50 km/h. The line uses 1435 mm (standard gauge) tracks, six-coach trains, 25 kV AC via overhead wires and full-height platform screen doors at every station.
Stations on Orange Line
| Station | Interchange/Connections | |
| English | Hindi | Yellow Line; New Delhi Railway Station |
| New Delhi | नई दिल्ली | Yellow Line; New Delhi Railway Station |
| Shivaji Stadium | शिवाजी स्टेडियम | |
| Dhaula Kuan | धौला कुआँ | Pink Line (Durgabai Deshmukh South Campus station) |
| Delhi Aerocity | दिल्ली एयरोसिटी | |
| Airport | हवाई अड्डा | Indira Gandhi International Airport T3–T2 |
| Dwarka Sector 21 | द्वारका सेक्टर 21 | Blue Line |
Orange Line Route Map
Further Extension of Orange Line
Orange Line is being extended till the under-construction Exhibition-cum-Convention Centre in Dwarka.
Top Attractions Connected by Orange Line
| Attraction | Nearest Station | Distance from Nearest Station (Km) |
| Gurudwara Bangla Sahib | Shivaji Stadium | 0.5 |
| Sacred Heart Cathedral | Shivaji Stadium | 0.5 |
| Jantar Mantar | Shivaji Stadium | 1 |
| Janpath Market | Shivaji Stadium | 1.1 |
| Connaught Place | Shivaji Stadium | 0.8 |
| Cathedral Church of the Redemption | Shivaji Stadium | 1.9 |
| Mughal Gardens (Rashtrapati Bhavan) | Shivaji Stadium | 2.5 |
| Rashtrapati Bhavan Museum | Shivaji Stadium | 2.1 |
| Kali Bari | Shivaji Stadium | 1.6 |
| Birla Mandir | Shivaji Stadium | 1.3 |
Other Delhi Metro Lines: Red | Yellow | Blue | Green | Violet | Magenta | Grey | Rapid Metro | Pink
