1. Search flights in private mode: Flights price always increases during the search, so if you want to buy the cheapest flight then book it in Incognito mode.

2. Book flight on cheapest day: During weekend flight requirements get increases so the airfare also increases. Try to book flight in weekdays especially on Tuesday afternoon when flight search get decreases.

3. Fly on weekdays: Most of the people prefer traveling on weekends due to which flight fares get increases. You can fly on weekdays like Tuesday, Wednesday, and Thursday to book the cheapest and best flight.

4. Plan your trip early: To book flights on the best price always plan your trip at least 7-12 weeks prior. Delta Airlines flights fare get increases once seats start getting booked. So if you book a flight early you will get the cheapest airfare.

5. Fly with basic option: Delta Airlines provide the best and cheapest option to fly with is Delta Basic Economy. You can book basic economy tickets at the lowest price and enjoy your journey. Basic economy is available for every flight in domestic and international destinations.

6. Subscribe for latest updates: Delta Airlines launch flight, vacations, deals & offers from time to time. Subscribe your email address with delta airlines and update yourself with the best low airfares and discounts.

7. Book Connecting Flights: While booking flights compare the price for non-stop and connecting flights. If you see one or two layovers during journey then you will get the low price on that flight. because non-stop flights always cost more as compare to connecting flights.

8. Use travel rewards to book flights: Join Delta SkyMiles membership program and earn SkyMiles with each flight or partner product purchase. Convert enough miles to book a flight on delta or upgrade your flights for free.

9. Be flexible with booking: If you want to book a flight at the best price then be flexible on booking dates. Use the date calendar to book flights and check all the airfares for particular dates. Check the lowest fare and book flight accordingly.

10. Book flights with reservation desk: Most of the time delta airlines reservations desk provide the cheapest airfare for few flights. Instead of booking online, try calling delta airlines number and get great deals & offers to book cheapest flights.