Know before you go.

There are a few exceptions that are worth noting.

The cheapest way to add luggage is to do it online.

JetBlue Airways Baggage Fees airport

Credit: Patrick T. Fallon/Bloomberg via Getty Images

(Bags purchased online less than 24 hours before flying cost $5 extra.)

Blue

This is the standard JetBlue fare, which means you get a personal item and carry-on.

When choosing a JetBlue fare, you’ll simply have to consider which factors are most important to you.