How do I add a bag to my Frontier Airlines reservation after booking?

If you've already made your Frontier Airlines reservation and you need to add a checked or carry-on bag, you can do so easily online or through the Frontier Airlines mobile app. Here are the steps:

• Go to Frontier Airlines' website and click on 'My Trip' at the top of the homepage.
• Enter your confirmation code and last name.
• Click on the 'Add Bags' button.
• Select the type of bag you want to add and pay the corresponding fee.

If you prefer to add a bag through the mobile app, open the app and go to 'My Trip.' Enter your confirmation code and last name, then follow the same steps as above to add your bag.

It's important to note that adding a bag to your reservation after booking may result in a higher fee than if you had added it during the initial booking process. Additionally, bag fees may vary depending on your route and the time of year.