Can you use Delta miles on United airlines?

You can't transfer airline miles from one airline to another. It's also impossible to combine two different types of miles into one account. However, you can use an airline's miles to book an award seat on another airline within the same alliance.



No, you cannot use Delta SkyMiles to book flights on United Airlines, nor can you transfer miles between the two. This is because they belong to competing airline alliances: Delta is a founding member of SkyTeam, while United is a founding member of Star Alliance. In 2026, the only way to use your Delta miles for partner travel is with other SkyTeam members like Air France, KLM, Virgin Atlantic, or Korean Air. Similarly, United miles are only redeemable on Star Alliance partners like Lufthansa, ANA, or Air Canada. If you have a significant balance in both and need to fly a specific route, your best option is to look for "overlapping" partners or use a flexible credit card point system (like Amex Membership Rewards or Chase Ultimate Rewards) that allows you to transfer points to both carriers individually depending on your current needs.

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100,000 Delta miles are worth an average of $1,120, according to WalletHub data. You will get the best value for your Delta miles if you use them for flights booked through Delta, though there are a few other redemption options to choose from.

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Under the SkyMiles Mileage Expiration policy, miles do not expire. Delta reserves the right to deactivate or close an account under the following circumstances: Fraudulent activity occurs. A Member requests an account closure.

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Delta makes it fairly easy to merge multiple SkyMiles accounts into one – so long as your first and last name are accurate on the accounts. First things first, you'll need to have the SkyMiles number and password for each account ready to go.

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To sell your Delta SkyMiles, you will typically need to create an account with the marketplace and provide your SkyMiles account information. The marketplace will then assess your miles and provide you with a quote. Once you accept the quote, the marketplace will purchase your miles and send you the cash proceeds.

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Delta miles do not expire as long as the Delta account is open and in good standing. The only time Delta miles expire is when you or Delta closes the account without first redeeming unused rewards.

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If you consistently get 2+ cents per mile on Delta award flights, a 60,000 mile sign-up bonus is worth at least $1,200!

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You're automatically eligible for a Complimentary Premier Upgrade as long as you are a Premier member (the higher your status, the earlier you become eligible for Complimentary Premier Upgrades and are flying on an eligible ticket on any eligible United-operated flight.

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A Medallion Member and one traveling companion may both enjoy a Complimentary Upgrade when traveling on Delta and Delta Connection carriers, as long as that companion is a General SkyMiles Member, Medallion Member, or partner airline elite member*, and traveling on the same flight in the same reservation.

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