I live in the area and can say our hotels here are generally really cheap overall. Unless you're flying through on some major event day you'll likely find last minute accommodations that are reasonably priced. For example, tonight there is a holiday inn express near the airport that is $86 tonight. Safe area of Irving, TX. I'd personally roll without a reservation and cross that bridge if you need to. Most if not all hotels are going to have a 24 hour cancellation policy.