Flight services between India and Singapore under the Vaccinated Travel Lane (VTL) commenced on Monday even as Singapore deferred similar travel arrangements with some other countries amid the 'Omicron' scare.

India and Singapore agreed on resuming scheduled commercial flights between both countries under the VTL from November 29 with six designated flights daily from Chennai, Delhi, and Mumbai.

Vistara and IndiGo said they have started operating flights to Singapore, while there was no comment from Air India. Vaccinated Travel Lane allows quarantine-free travel to Singapore for fully vaccinated travellers.

"There is no change as of now in terms of our Singapore operations - our first flight went at 1:50 am today," a Vistara spokesperson said.

While there is no change as of now, the spokesperson said the situation is being reviewed and a decision will be taken accordingly.

"We can confirm that we are operating our flight on Chennai-Singapore as per schedule," an IndiGo spokesperson said.

Vistara had disclosed that starting from November 29, it would operate Airbus A320neo/A321neo planes between India and Singapore.

Singapore has deferred VTL arrangements with Qatar, Saudi Arabia, and the United Arab Emirates as a "precautionary move" to reduce the risk of importation and spread of 'Omicron'.