Frontier Airlines
Keep your underseat bag simple and your thoughts on the open-air adventure waiting after landing.
Checked against official Frontier Airlines baggage rules · Nov 2026
Under the seat
18 × 14 × 8 in46 × 36 × 20 cm
Free · up to 35 lbFree · up to 15.9 kg
Overhead bin
24 × 16 × 10 in61 × 41 × 25 cm
Paid add-on on lowest fare
Sized to Frontier Airlines’s exact cabin limit · Picked by frequent flyers
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