I have a flight out of BWI on Monday as well, OP. Not to Cancun though, unfortunately. I think we will be able to get the airport (we live right off of an emergency road) but wondering the best way to get there. I don't want to call a car service--no need to put someone else in danger. I can drive but I worry that all of the indoor parking will be full with people who parked there earlier in the week and are stuck where they are. DH said he will drive me--may go with that option. Any idea how parking will be at BWI?