I recommend at least 2 hours. If you got yout tickets online it's a breeze. At least it was for me when I flew out of BWI (Baltimore-Washington Internation) to Kansas. You never know if you have to wait in line to the terminals (especially being Thanksgiving week), and then there are security checks that could take time. I watched as they randomly pulled people aside to do a search. One lady took about 20-30 minutes.