I agree, unless one is coming in on an international flight it makes no sense not to come in to Reagan.We did this analysis for our Spring Break trip and there's not even really a debate IMO. Reagan wins hands down for convenience. You are only a few minutes from the attractions. You will spend AT LEAST an 1.5 or 2 hours getting from BWI to the city, depending on how you hit the train's schedule, and where you are staying....the train goes to Union station, which would involve yet another transfer to get to wherever you are staying (most likely). When you leave, you will need to allow the same amount of time. Whereas when we leave, it will be a 10-15 minute cab or Uber ride (and around $12-14 too, vs. more than that to get the 4 of us to BWI via the train). It would have to be a HUGE savings for me justify that added hassle, and it wasn't even true. It was the same.
We did this analysis for our Spring Break trip and there's not even really a debate IMO. Reagan wins hands down for convenience. You are only a few minutes from the attractions. You will spend AT LEAST an 1.5 or 2 hours getting from BWI to the city, depending on how you hit the train's schedule, and where you are staying....the train goes to Union station, which would involve yet another transfer to get to wherever you are staying (most likely). When you leave, you will need to allow the same amount of time. Whereas when we leave, it will be a 10-15 minute cab or Uber ride (and around $12-14 too, vs. more than that to get the 4 of us to BWI via the train). It would have to be a HUGE savings for me justify that added hassle, and it wasn't even true. It was the same.
If you choose BWI I believe the MARC train can take you from there to Penn Station in DC.
And, depending on where you are, taking the Metro to Reagan is easy (though only a savings if you are a small number of people - I'm usually traveling alone so it is a savings).
I also just prefer Reagan as an airport - no trains or "moving lounges" to deal with and security lines always seem shorter (I have TSA precheck but even those are shorter at Reagan).
ETA - sorry, I'm talking about IAD not BWI as the other option.
DCA - Reagan National. NOT. EVEN. CLOSE.Friend and I are going to visit Washington DC. Going to try and stay near the Mall. Southwest flies to Reagan National and BWI. Which one is better?
Thanks!

Thanks guys. There was a third airport but I always hear people talk about BWI and Reagan. BWI is about $10 less so I think we'll go with Reagan.
I go into National as it's so much closer and easier. It's the only one I would fly into if going to D.C.
So few of us still call it "National" anymore. Most people stare at me in confusion when I say it.