Checked bags: Maximum of 62 linear inches (length + width + height; 158 cm) including handles and wheels and maximum of 40 pounds in weight (18.1 kg). Any bag that exceeds these dimensions or weight limit is considered oversized/overweight and has a corresponding charge.

Spirit Airlines operates on an "Ultra Low-Cost Carrier" (ULCC) model, which means the base fare only covers your seat and one small personal item (like a backpack) that must fit under the seat in front of you. Any item larger than 18x14x8 inches, including standard carry-on suitcases and checked bags, incurs significant fees that are usually cheaper if paid during the initial booking. Beyond baggage, Spirit has strict restrictions on seat assignments; if you do not pay a fee to select a seat, you will be randomly assigned one at check-in, and there is no guarantee that groups traveling together will be seated next to each other. Furthermore, Spirit does not provide complimentary water, snacks, or Wi-Fi; all onboard services are "a la carte" and must be paid for via credit card. In 2026, their "Big Front Seat" remains a popular upgrade for those wanting more space without the full "First Class" price tag, but the core restriction remains: if you didn't pay for the extra "frill," you won't receive it.