United Airlines MileagePlus miles offer tremendous flexibility because you can use miles to book award flights on most of its 37 partner airlines. In some cases, you might use fewer United miles booking a partner flight than you would booking a United flight to the same destination. When United Airlines did away with its award…

Keith M. Rosso is a writer at NerdWallet. Email: travel@nerdwallet.com.

The article The Guide to United Airlines Partners: Earning and Redeeming Miles originally appeared on NerdWallet.

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