Delta occasionally offers tiered bonus promotions that can reduce the per-mile cost. For example, a recent promotion offered up to a on purchased miles.

: If you buy miles to top off an account for a flight, this feature essentially makes each of those miles go 15% further, lowering the "effective cost" of the flight. 3. Delta "Pay with Miles"

: You can use miles in 5,000-mile increments to take $50 off your fare.

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Delta occasionally offers tiered bonus promotions that can reduce the per-mile cost. For example, a recent promotion offered up to a on purchased miles.

: If you buy miles to top off an account for a flight, this feature essentially makes each of those miles go 15% further, lowering the "effective cost" of the flight. 3. Delta "Pay with Miles"

: You can use miles in 5,000-mile increments to take $50 off your fare.