# Distance from Butte (BTM) to Kolkata (CCU)

> 12,099 km · estimated flight time 15h · Ultra-long-haul route.

## Summary

- **Distance**: 12,099 km / 7,518 mi / 6,533 nm
- **Estimated flight time**: 15h
- **Heading**: 340° (north northwest)
- **Return heading**: 15° (north northeast)
- **Classification**: Ultra-long-haul
- **Type**: International (United States) → India
- **Intercontinental**: North America → Asia
- **Time difference**: +11.5h (When it's 20:28 in Butte, it's 07:58 in Kolkata)
- **Elevation difference**: 5,535 ft (CCU is lower than BTM)

## Airports

### [Bert Mooney Airport (BTM)](https://www.flightduration.online/airport/btm-butte-bert-mooney-airport/1ef266df-1175-60a4-aa32-06bb2780ed98)

- City: Butte, United States
- ICAO: KBTM
- Timezone: America/Denver
- Coordinates: 45.950000, -112.500000
- Elevation: 5,551 ft

### [Netaji Subhash Chandra Bose International Airport (CCU)](https://www.flightduration.online/airport/ccu-kolkata-netaji-subhash-chandra-bose-international-airport/1ef266df-f023-6fe4-a8d5-06bb2780ed98)

- City: Kolkata, India
- ICAO: VECC
- Timezone: Asia/Kolkata
- Coordinates: 22.650000, 88.450000
- Elevation: 16 ft

## Route notes

This is an ultra-long-haul route, one of the longest in aviation. It requires wide-body aircraft with extended range capability such as the Airbus A350-900ULR or Boeing 777-200LR. Passengers should prepare for an extended flight with multiple meal services.

Time-zone information: When it's 20:28 in Butte, it's 07:58 in Kolkata.
With a 11.5-hour time difference, expect significant jet lag.

## Related

- [Bert Mooney Airport (BTM)](https://www.flightduration.online/airport/btm-butte-bert-mooney-airport/1ef266df-1175-60a4-aa32-06bb2780ed98)
- [Netaji Subhash Chandra Bose International Airport (CCU)](https://www.flightduration.online/airport/ccu-kolkata-netaji-subhash-chandra-bose-international-airport/1ef266df-f023-6fe4-a8d5-06bb2780ed98)
- [Flight duration calculator](/#calculator)