SkyMiles is the frequent-flyer program of Delta Air Lines that offers points (or "miles") to passengers traveling on most fare types, as well as to consumers who utilize Delta co-branded credit cards, which accumulate towards free awards such as airline tickets, business and first-class upgrades, and luxury products.

[6] The airline also has a separate SkyBonus program that provides small to mid-sized business owners with a way to earn points for trips taken by employees, good towards free flights, upgrades, Medallion status and other travel awards.

[23] Medallion status entitles members to unlimited complimentary upgrades, subject to availability, on most published economy fares on Delta and certain Delta-designated codeshare flights in North America within or between the United States (excluding Hawaii) and Bermuda, Canada, Central and South America, the Caribbean and Mexico.

[24] In addition, preferred coach seating such as in the Economy Comfort section is set aside for medallion members for when first and business class upgrades are not available.

[25][26] Although not a published benefit, certain top tier members of the program have been transferred at Delta hubs by an automobile and chauffeur pick up service (see photograph).

)[35] In January 2013, Delta announced that beginning in the 2014 program year qualifying for elite Medallion status will require meeting spending thresholds.

[37] On September 26, 2017 Delta announced that the Credit Card waiver for Diamond Medallions only, was being increased to $250,000 which effectively eliminates it for many travelers.

The program was in effect mortgaged to keep the airline afloat in view of the catastrophic drop in demand for air travel due to the COVID-19 pandemic.

However, frequent fliers continued to use their Delta SkyMiles credit cards, and cash from sales to American Express declined only 5% year-over-year to $1.9 billion.

[47] Most airlines, Delta included, instituted rollover of status and miles programs to keep its loyal customers in the wake of the pandemic.