Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Indira Gandhi Intl to Roland Garros as you normally would.
When travelling, we recommend packing in preparation to handle common weather conditions. The rainfall in Delhi is typically less than St. Denis. We can gather that this will continue over the next 5 days.
Air India is one of the carriers that may have flexible change policies. You can use our site to filter for other airlines that may also have this kind of flexibility.
We forecast the temperature to be around the 40 °Cs in May, on average. The temperature in St. Denis is generally colder than in Delhi. Book flights in a timely manner in correlation to your departure date.