Travel time between terminals can take as long as 30 to 45 minutes; so it would be in your best interest to allow at least 1 and 1/2 hours to 2 hours layover time. If your flight into DFW should be delayed, 40 minutes almost guarantees you would miss your connecting flight.

A 50-minute layover at Dallas-Fort Worth International Airport (DFW) is technically "legal" and often doable for domestic-to-domestic connections, but it leaves very little room for error. DFW is a massive hub, and even with the efficient Skylink high-speed train connecting all five terminals, it can take 15 to 20 minutes to travel from one gate to another if they are in different terminals. For domestic flights on the same airline (typically American Airlines), the gates are often grouped, which helps; however, boarding usually begins 30 to 50 minutes before departure, meaning your next flight might already be boarding by the time you land. For international-to-domestic connections, 50 minutes is not enough time, as you must clear U.S. Customs and Border Protection, collect your bags, and re-clear security, a process that usually requires a minimum of 2 to 3 hours. Even for domestic hops, a 50-minute window is risky if your first flight is delayed by even 10 minutes. If you are a fast walker and don't have checked bags, you can make it, but most travelers would prefer a minimum of 90 minutes to ensure a stress-free transit.