How to Use Miles to Upgrade a Flight (and When Not To)

How to use miles to upgrade a flight can be confusing, and it's not always the best choice. Here's how to upgrade — and when you should book the seat...

# How to Use Miles to Upgrade a Flight (and When Not To) How to use miles to upgrade a flight can be confusing, and it's not always the best choice. Here's how to upgrade — and when you should book the seat you want. **Read the full article:** [NerdWallet](https://www.nerdwallet.com/travel/learn/how-to-use-miles-to-upgrade-a-flight) *This article was originally published by NerdWallet. MoneyWiseInc provides expert curation of the best financial content from trusted sources.*