Closest airport to venue and church is Ronald Reagan Washington National Airport (https://www.flyreagan.com/)
Easily accessible to the DC metro. (https://www.wmata.com/)
The venue is located right off of the Blue Line (King St-Old Town)
There is also Dulles International Airport, which is about a 40 minute drive to Alexandria. It is also accessible via the Silver Line on the DC metro.
(https://www.wmata.com/)