It is best to book a Delta flight on Tuesday, Wednesday or Saturday as the prices are lower on these days.

Passengers should also be on the lookout for seasonal Delta Airlines Flight Bookings deals that are offered by the airlines regularly.

To obtain the information needed about a flight reservation, contact Delta customer service if a traveller is not able to book a Delta Airlines ticket for a fair price.
https://www.flysair.com/blog/airlines/united-airlines-discount

Delta Airlines recommends that passengers book their flight tickets as soon as possible. The earlier they reserve their flight ticket, the better the chance of getting the incredible delta discount.
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