Best Ways to Use Delta SkyMiles
Work around the pricing
Delta prices awards dynamically and often expensively, so the strategy is to redeem when the price is reasonable rather than expecting a fixed deal. Watch for lower-priced dates and flash sales, and compare the SkyMiles price to booking the same Delta flight through a SkyTeam partner program, which is sometimes cheaper. See Delta cards.
Partner and SkyTeam options
Delta and its SkyTeam and other partners open more redemption options, and partner awards can occasionally beat Delta own pricing. Delta miles also do not expire and awards carry no close-in booking fees, so you have flexibility on timing. The trade-off is value: temper expectations versus chart-based programs.
Feed it and decide
Delta is a transfer partner of Amex Membership Rewards, so an Amex setup can fund redemptions, but only transfer once you confirm a good price and availability, since transfers are one-way. Use SkyMiles for reasonably priced Delta flights you want rather than chasing outsized value.