There are other two local airports - Baltimore (BWI) and Dulles (IAD). However, DCA is closer and more convenient as you can take Lyft, Uber, or Metro for cheaper fares.
Gallaudet Shuttle Bus
This shuttle bus will take you to the NOMA area/ Metro Station and Union Station. Union Station is the place where you can board buses, Amtrak, Metro, etc.
UBER / LYFT
Wasthington Metropolitan Area Transit Authority (WMATA or METRO) has its own city bus services. Check the routes here.
There are two stations on Gallaudet campus. One is at the front gate while the other is at the outside of 6th street gate between Gallaudet and Union Market.
The DC Circulator is a bus system in D.C. and it can take you to many locations - from Georgetown to Adams Morgan to Dupont Circle.
Plan to come earlier or stay later between the summer sessions? Or need a weekend getaway? Take either Amtrak or Bus to visit Philadelphia, New York City, and/or Boston! The buses have cheaper fares. There are Maryland and Virginia transits as well. Check them here: Maryland and Virginia.
D.C. Streetcar is a new project and consists of only one line - a 2.2-mile section between H Street and Benning Road. The ride is free!