Air India currently operates to Colombo from Chennai.
The 182-seater inaugural Airbus A321 flight from Delhi, which took off from Terminal-3 of the Indira Gandhi International Airport here at 1200 hours was given a ceremonial water salute after it landed at Colombo's Bandaranaike Airport at 1535 hours, Air India said in a release.
The flight will herald a new era in aviation and tourism between the two neighbouring countries, the government owned airline said, adding the new non-stop air service would also provide a link to an important gateway from the Indian sub-continent.
The flight number- AI 275 from Delhi will leave at 1200 hours and reach Colombo at 1535 hours except on Wednesdays when the flight will leave Delhi at 1330 hours and reach Colombo at 1715 hours, the Air India said.
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The return flight AI 276 from Colombo will depart at 0820 hours, arriving Delhi at 1205 hours, it said.
"Delhi being the hub for Air India, it will provide passengers from Sri Lanka, connections to flights of Air India and other Star Alliance member airlines to Europe, USA, Far East and Australia.
"Likewise, passengers arriving from these international destinations will get a convenient connection to Sri Lanka on this new flight," Air India said.
In addition, the new flight to Delhi will also provide immediate connections to many domestic destinations in India where Air India has introduced competitive fares, it said.
As per the Sri Lanka Tourism Development Authority, India accounted for more than 16 per cent of the total international tourists in the previous year, placing it at number one position in tourist flow to the island nation.
Sri Lanka was ranked as the fourth largest generator of tourists to India, the release said.
Air India has wide global network of 34 destinations spanning across the USA, Europe, Far-East and South-East Asia and the Gulf.
Besides, its domestic network covers 50 destinations, including far-flung areas of the North-East, Ladakh, Andaman and Nicobar Islands.