This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

Airfares are already expensive.

Here are some tips so you don’t get hit with additional fees.

First, know your bag fee rules because they vary among airlines.

Also, book online.

That’s because a lot of air carriers charge you an additional $10.00 to $25.00 to make reservations via phone.

Finally, set your schedule in stone.

It can cost you anywhere between $30.00 and $200.00 to change your itinerary.