Below persons can come to India
1) All Indian Passport Holders
2) All Foreign Nationals having Indian OCI Card
3) Those having visa issued by Indian Embassy in April 2020 or after that.
4) Certain Foreigners having Indian Visa issued prior April 2020 like Employment Visa, Student Visa, Family Visa (X Series) can come but please refer https://boi.gov.in/content/advisory-travel-and-visa-restrictions-related-covid-19-1 to cross verify.
All E-Visa issued before April 2020 are not valid for travel to India at present.
Above is entry regulation of India. You must also check exit regulations of your country of Origin and your Airline's website to check your eligibility to travel on that airline. Some countries like Australia for example have travel BAN in place for their citizens. We confirm that USA Citizen from USA and Canadian Citizen from Canada can now come to India on OCI Card without giving any reason.
Some Airlines (Like Lufthansa) Still insist to fill below form compulsorily and note down Registration Number and carry a copy. It was a compulsory requirement of Indian Govt earlier but not now (03-OCT-2020). Please check with your Airline. When coming from USA, Air India and United do not need/ask this form now (03-OCT-2020).
This form, in serial no 4, lists only Air India Flights. If you are coming by other airline please select Air India flight of nearby date to Delhi form a city nearby to your city. You can write your Flight Details in Remarks field if you wish and if you have a paid ticket. According to our opinion, flight details given in the form is for government data collection about how many persons are coming to India from specific cities. You can come on a different flight also (Other than what you filled in above form), if your plan changes or you find better route/price.
Before as well as After you make a Paid Ticket, you must refer official website of your airline for all airline specific information and other compulsory requirements that you must have to follow.
Please refer our web page just after this page for Indian Quarantine Rules, Filling Online Compulsory Self Reporting Form, Recently Started Negative Test Report Facility at Delhi Airport and Other information.