Frontier will usually charge you to select a seat. You can always skip selection for free and get one assigned at the gate. “Stretch seating” offers more legroom, but costs more.
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In fact, most regular airlines now charge for seat selection anyways. It's often around $10-$30 per seat per flight segment, so if you cave in and pay for that, it can add up quickly. You shouldn't do it. No matter which airline you're flying on, don't ever pay to select a seat.
Frontier carry-on guidelines. The Frontier carry-on guidelines allow all passengers to bring one personal-size carry-on on board for free. However, the bag must be able to fit underneath the seat in front of you and should be no bigger than 15 inches in height by 18 inches in width by 8 inches in depth.
Just say no. Within 24 hours of your departure, the airline will assign you a seat. Pro tip: If you want to avoid paying for a seat assignment, arrive at the airport early. That way, you'll have the pick of the unassigned seats.
If you were not able to make an advance seat assignment, keep an eye on the seat map as these seats will begin to open up once check-in begins and then once the gate opens for the flight.