That's right, you can actually save on airfare after booking. Both Expedia and Travelocity have 24-hour windows on their low-fare guarantees, and Orbitz's Price Assurance only applies if someone buys that fare at a lower price. But booking directly with the airline can allow even more changes after the fact.
While I wouldn't recommend torturing yourself with fare checks everyday from purchase to takeoff, it makes sense to monitor the price 24–48 hours after you book, just in case. To see a chart of fees and refund amounts by airline, read more.
|Alaska||Refund fare difference, $100 discount code, same day as booking||$0|
|American||Refund fare difference, $50 promo code, same day as booking||$150|
|Continental||Refund fare difference, $100 travel certificate, same day as booking||$150|
|Delta||Refund fare difference, $100 travel voucher, same day as booking||$150|
|JetBlue||Refund fare difference into a JetBlue travel voucher||$0|
|Southwest||Refund fare difference into Southwest travel credit; no same day restriction||$0|
|United||Refund and $100 travel certificate same day as booking||$150|
|US Airways||Refund minus $150 change fee; no same day restriction||$150|