Join the Delta Airlines SkyMiles program. You can apply online at delta.com or fill out a paper form at any Delta desk in an airport or on any Delta flight.
Use your Delta SkyMiles number on Delta or partner airlines flights. If you forgot to inform the airline of your SkyMiles number, or you do not receive credit for a flight within seven business days of a flight, visit delta.com and fill out the online Airline Mileage Credit Request Form. You must request credit within nine months of a flight.
Fly first class, business class or full-fare economy on Delta or partner airlines to receive 750 qualifying miles per 500-mile segment actually flown. Discounted economy fares award 500 qualifying miles per 500-mile segments flown.
Use your Delta SkyMiles frequent flyer number on the following partner airlines: Aeroflot, AeroMexico, AirEuropa, Air France, Alaska Airlines, Alitalia, China Southern, CSA Czech Airlines, KLM Royal Dutch Airlines, Kenya Airways and Korean Air. Trips on some non-Delta coded flights may earn fewer qualifying miles than trips on Delta-coded flights.
Count segments rather than miles if you take trips of under 500 miles. You must fly a total of 30 qualifying segments to obtain Silver status.