Eighty seats in each four-weekly Boeing-777 flights operating from the metropolis would now be sold at a promotional fare of Rs 4,000 from Kolkata to Singapore and back, and at Rs 6,000 for Kolkata-Singapore-Kuala Lumpur or Penang or Bangkok and back, Bharath Mahadevan, manager, airlines, Eastern India, said.

The normal fare for the Kolkata-Singapore flight is a little over Rs 11,000 and for that to Singapore, Kuala Lumpur and back over Rs 18,000.

Fly Mumbai-Delhi at cheapest prices

However, taxes and other terms and conditions would apply, Mahadevan added.

The sale of tickets for the promotional offer would remain open from July 5 to July 15 and would remain valid for travel between July 22 and August 19 in the 'economy' class only.

The offer was for off-season business and to promote tourist traffic as well as West-bound passengers.

The airline has tied-up with two five-star hotel chains, Copthorne and Millennium, in Singapore and Kuala Lumpur, for lodging at a subsidised rate of Rs 2,250 per night per room, Mahadevan said.

The Airline at present operates 52 flights a week. Of these, 14 flights are from Mumbai, seven each from Delhi and Chennai, and three each from Bangalore, Amritsar and Ahmedabad, besides those from Kochi, Hyderabad and Thiruvananthapuram.