Measure and weigh your bags.
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While checking a bag can easily cost $40 to $70 roundtrip, it’s the additional fees that really break the bank. If your bag weighs more than 40 to 50 pounds, you will likely be charged overweight baggage fees, which cost anywhere from $50 to $400 per bag roundtrip, in addition to the checked baggage fee. If your bag is more than 62 linear inches (measured by length + width + height), you will likely be charged oversized baggage fees, which cost anywhere from $50 to $600 per bag roundtrip.
