Delta security airlines were quite long for early Monday travel. They were moving quite well, but still give self 1.5 HRS at least for domestic flights out.
If you need to fill up the rental car gas tank better do it before you take the airport exit. There is none to be found anywhere near the car rental facility.
Seems to have good luck at BWI. Just checked my 67lb bag with no problem on SW and got through security in 15 min. If the security line is long, try downstairs. It's never really crowded.
Terminals A and B are connected, so you can use whichever security line is shorter. Also, if flying Southwest, use the curbside checkin. It's always shorter than going inside.
Baltimore/Washington International Thurgood Marshall Airport is an international airport serving the Baltimore-Washington Metropolitan Area in the United States.