"Does Frontier Airlines allow a free personal item, and what are the size limits?" Yes, Frontier Airlines allows each passenger to bring one free personal item onboard, as long as it meets their size requirements. The maximum size for a personal item is 14 inches high, 18 inches wide, and 8 inches deep (35.5 cm x 45.7 cm x 20.3 cm), which is designed to fit under the seat in front of you. Common personal items include small backpacks, purses, and laptop bags. Larger items that exceed these dimensions will be classified as carry-ons, which require an additional fee. Make sure to measure your personal item before heading to the airport to ensure it meets the size restrictions. Checking these details in advance will help you avoid extra charges and ensure a smooth boarding process.