On select fares including Blue Plus, Mint, and Mosaic, you can check up to two bags at no extra charge. For more basic fares, the cost of checked baggage starts at $35 per bag. You can always try and redeem a JetBlue promotional or coupon code to cut down on the overall cost of your luggage. If you do find that the fare you purchased doesn’t include checked bags, you can still save money if you buy them in advance on the airline’s website or through the app.