List of Airlines at (DCA) airport

Terminal 1

Historically known as Terminal A, this facility houses boarding gates A1 through A9. It is primarily used by low-cost carriers and international regional flights to Canada.

Air Canada Express
Offers direct cross-border flights to its main hubs in Canada.
Main destinations: Toronto-Pearson (YYZ), Montreal (YUL), and Ottawa (YOW).
Official Website | Mobile App

Frontier Airlines
Operates budget flights to selected destinations.
Main destinations: Denver (DEN) and Orlando (MCO).
Official Website

Southwest Airlines
Connects the capital with its key operating bases and vacation destinations.
Main destinations: Atlanta (ATL), Chicago-Midway (MDW), Dallas-Love Field (DAL), Nashville (BNA), St. Louis (STL), Orlando (MCO), and Tampa (TPA).
Official Website

Terminal 2

Formerly known as Terminal B/C, this modern structure houses gates B10 through E59. It is the main hub for American Airlines and hosts the other major national airlines (Legacy Carriers). Due to the federal "Perimeter Rule," most flights from here have a distance limit of 1,250 miles, except for Congress-approved exceptions to key West Coast cities.

Alaska Airlines
Operates long-haul flights to the West Coast (perimeter exceptions).
Main destinations: Seattle (SEA), Portland (PDX), San Francisco (SFO), and Los Angeles (LAX).
Official Website

American Airlines (Main Hub)
DCA is a key hub for American, occupying the vast majority of gates in Concourses C, D, and E. It offers "American Eagle" service for regional routes and the "AA Shuttle" for business travelers.
Main destinations: Charlotte (CLT), Chicago (ORD), Dallas/Fort Worth (DFW), Miami (MIA), Philadelphia (PHL), and Phoenix (PHX).
AA Shuttle: Frequent service to Boston (BOS) and New York-LaGuardia (LGA).
Official Website | Mobile App

Delta Air Lines
Generally operates from Concourse B gates. Connects to all its major hubs.
Main destinations: Atlanta (ATL), Detroit (DTW), Minneapolis/St. Paul (MSP), Salt Lake City (SLC), New York (JFK/LGA), and Boston (BOS).
Official Website

JetBlue
Primarily operates routes to the Northeast and Florida from Concourse B.
Main destinations: Boston (BOS), Fort Lauderdale (FLL), Orlando (MCO), West Palm Beach (PBI), and San Juan (SJU).
Official Website

United Airlines
Connects the capital with its global hubs. Generally operates in Concourse B.
Main destinations: Chicago (ORD), Denver (DEN), Houston (IAH), Newark (EWR), and San Francisco (SFO).
Official Website