Yes, fees might apply. They are determined by the type of fare you purchased, your destination, if you are an active U S military personnel and/or dependent, if you have status with Frontier Airlines' (F9) frequent flyer program, status with an affiliated carrier, or if you have a Frontier Airlines (F9) sponsored credit/charge card.
At booking and online web check-in: $30.00 USD
At airport ticket counter or kiosk: $40.00 USD
At gate: $60.00 USD
Note: Higher fee for travel from 11.19.2015 through 1.5.2016 and 6.9.2016 through 8.16.2016 of $35.00 USD at booking, $40.00 USD at online web check-in, and $45.00 USD at airport ticket counter or kiosk.
Frontier Airlines' (F9) standard checked baggage / hold luggage fees:
First bag:
At booking and online web check-in: $25.00 USD
At airport ticket counter or kiosk: $30.00 USD
Note: Higher fee for travel from 11.19.2015 through 1.5.2016 and 6.9.2016 through 8.16.2016 of $30.00 USD at booking, $35.00 USD at online web check-in, and $40.00 USD at airport ticket counter or kiosk.
Second bag:
At booking and online web check-in: $30.00 USD
At airport ticket counter or kiosk: $35.00 USD
Note: Higher fee for travel from 11.19.2015 through 1.5.2016 and 6.9.2016 through 8.16.2016 of $40.00 USD at booking and at online web check-in, and $45.00 USD at airport ticket counter or kiosk.