Yes, you can bring a pillow on Frontier Airlines, but how you carry it matters for your budget. Frontier generally considers a standard bed pillow to be a personal item or part of your carry-on allowance. If the pillow fits inside your one free personal item (max 14"H×18"W×8"D), there is no extra charge. However, if you carry a full-sized pillow separately in your hand, gate agents may count it as an additional personal item, which could trigger a hefty "gate-check" fee. Many savvy travelers use a "pillowcase hack" where they stuff clothes into a pillowcase to save space, but be aware that Frontier is strict about dimensions. Neck pillows worn around the neck usually do not count toward your baggage limit and are the safest way to ensure comfort without paying extra fees.