To get discounts on Delta flights, book in advance,＋１－８０１－（８５５）－５９０５ travel on off-peak days like Tuesday or Wednesday, use a Delta SkyMiles credit card for 15% off award flights, and be flexible with your travel dates and nearby airports＋１－８０１－（８５５）－５９０５. You can also look for limited-time flash sales and consider other discounts like student fares if you are eligible.