In 2026, the cost of a 23kg checked bag on Jet2 is not a fixed price; instead, it varies based on your specific route and the time of booking. On average, you can expect to pay between £25 and £55 per bag, per flight if you book online in advance through the Jet2 app or website. If you wait until you reach the airport, the price increases significantly, often to a flat rate of approximately £45 to £65. The airline allows each passenger to book up to three 23kg bags, and the total weight limit is strictly enforced. A popular "best practice" in 2026 is to book your bags at the same time as your flight, as "post-booking" additions are often slightly more expensive. For those traveling on a Jet2holiday package, one 22kg bag is usually included in the base price, though you can often pay a small "top-up" fee to increase this to the standard 23kg or add additional pieces. Always check your "Manage My Booking" portal for the exact quote for your destination to avoid surprises at the check-in counter.