The cheapest available fares are basic economy, which means early seat selection and a checked bag are not included. With all airlines except Level, it costs $60 - $80 each way to upgrade to regular economy, which includes a checked bag and early seat selection. A checked bag costs $60 each way on all airlines except Level à la carte.
With Level, a checked bag costs $44 each way when booked in advance. Early seat selection costs $15 each way. A full-size carry-on bag (max weight 22 lbs) is included in the price