Book Flights to Washington DC
Washington DC -- the US capital, home to 19 free Smithsonian museums, the National Mall monuments, the Capitol, and the most historically significant address book of any city on earth -- is served by three airports: Reagan National (DCA), Dulles (IAD), and Baltimore-Washington (BWI). American, United, Delta, Southwest, and Alaska all operate the DC metro airports.
FareOptic compares all carriers and all three DC-area airports -- finding the cheapest available fare for your Washington trip.
Cheap Flight Deals to Washington DC (DCA/IAD/BWI)
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Why Visit Washington DC?
Free Smithsonian museums, the Capitol, Georgetown, monuments, and four centuries of American history
The National Mall and Smithsonian Institution -- 19 Free Museums and the World's Greatest Museum Campus
2.4 Miles, 19 Museums, 1.5 Miles of Free Galleries -- America's Attic on the Most Important Lawn in the WorldThe National Mall -- a 2.4-mile open park from the Lincoln Memorial (west) to the US Capitol (east), bordered by 19 Smithsonian Institution museums and galleries, the Washington Monument, and the reflecting pools and memorials of the World War II, Korean, Vietnam, and DC War Memorials -- is the most visited public space in the United States (approximately 30 million annual visitors) and arguably the world's greatest concentration of free public cultural institutions. The Smithsonian Institution (established 1846 from a bequest by British scientist James Smithson, who never visited the US) operates 19 museums and galleries in the DC area -- all free of admission -- housing 155 million objects: the National Museum of Natural History (40 million specimens including the 45.5-carat Hope Diamond), the National Air and Space Museum (Wright Flyer, Apollo 11 command module -- the most visited museum in the world), the National Museum of American History, the National Gallery of Art (Europe's masterworks in Renaissance to Impressionism), and 14 other institutions.
James Smithson's Bequest -- Why a British Scientist Who Never Visited America Founded the World's Largest Museum Complex
James Smithson (1765-1829) -- an illegitimate son of the First Duke of Northumberland, a distinguished chemist (the mineral smithsonite is named for him), and Fellow of the Royal Society -- died in Genoa in 1829, leaving his entire estate to his nephew Henry James Hungerford. When Hungerford died childless in 1835, the estate (£104,960 -- approximately $500,000, or $16 million in 2024 dollars) passed to the United States of America 'to found at Washington, under the name of the Smithsonian Institution, an establishment for the increase and diffusion of knowledge.' Smithson's reason for this bequest -- he never visited the US and had no known connection to the country -- remains one of the great mysteries of American cultural history. One theory: Smithson harbored resentment toward the British aristocracy that had denied him legitimacy and saw American democracy as a superior system worth endowing.
The US Capitol, Supreme Court, and Library of Congress -- The Nation's Government on Capitol Hill
Free Tours, the World's Most Powerful Legislature, and the Largest Library on EarthCapitol Hill -- the elevated plateau (88 feet above the Potomac) at the east end of the National Mall -- contains three of the most architecturally and historically significant buildings in the United States: the US Capitol (home of the Senate and House of Representatives, free guided tours available by congressional reservation; the Capitol dome's cast iron construction weighs 8.9 million pounds and was completed during the Civil War in 1863 on Lincoln's instruction -- a symbol that the Union would survive); the Supreme Court of the United States (across 1st Street from the Capitol, free public viewing of oral arguments during court terms October-June on a first-come, first-served basis); and the Library of Congress Thomas Jefferson Building (1897, Italian Renaissance -- the world's largest library with 174 million items in 450 languages, free admission, extraordinary interior including the Great Hall and the original 1507 Martin Waldseemüller map that first used the name 'America').
The 1814 Burning of Washington and Why the Capitol Dome Was Built During the Civil War
The British Army burned Washington DC on August 24, 1814 (during the War of 1812), destroying the Capitol, the White House, the Treasury, the War Department, and several other government buildings -- the only time since the American Revolution that a foreign power has captured and occupied the US capital. President Madison fled to Virginia; Dolley Madison famously saved a Gilbert Stuart portrait of George Washington before departing the White House. The Capitol's original wooden dome (built 1793-1824) was damaged in the fire and repaired; the current cast iron dome was constructed 1855-1866 during the Civil War. Abraham Lincoln insisted that Capitol dome construction continue throughout the war -- 'if people see the Capitol going on, it is a sign we intend the Union shall go on' -- making the dome a literal symbol of Union survival.
Georgetown, Dupont Circle, and DC's Neighborhood Culture -- Beyond the Monuments
18th-Century Waterfront, Embassy Row, the Kennedy Center, and the Best Restaurant Row on the East CoastWashington DC's neighborhood culture extends far beyond the federal monuments: Georgetown (northwest DC, established 1751 -- predating Washington DC itself) is a cobblestoned Federal-period neighborhood with 18th-century townhouses, the Georgetown Waterfront on the Potomac, and a high-density restaurant and bar scene on M Street and Wisconsin Avenue. Dupont Circle is DC's cosmopolitan hub -- Embassy Row (Massachusetts Avenue NW), independent bookstores, international restaurants, and the Phillips Collection (private art museum, free Sundays, exceptional collection including Renoir's 'Luncheon of the Boating Party'). The Kennedy Center for the Performing Arts (opened 1971, John F. Kennedy's designated memorial) offers free performances daily on its Grand Foyer stage (the Millennium Stage, 6 PM daily) in addition to world-class paid performances in its Concert Hall, Opera House, and Eisenhower Theater.
The National Cathedral and DC's Hidden Gargoyle -- Darth Vader on the National Cathedral Facade
Washington National Cathedral (Massachusetts and Wisconsin Avenues NW, begun 1907, completed 1990 -- 83 years of construction, the sixth-largest cathedral in the world by floor area) has a hidden gem that has delighted visitors since 1986: a grotesque on the northwest tower depicting Darth Vader -- added after the Cathedral held a student design competition in the 1980s; children were invited to submit ideas for a gargoyle, and the winning entry was the Star Wars villain (submitted by 13-year-old Christopher Rader of Mississippi). The Darth Vader grotesque (not technically a gargoyle since it does not channel water) is visible from the northwest corner of the cathedral with binoculars, approximately 45 feet up on the Cathedral tower. The National Cathedral also contains a piece of moon rock from Apollo 11 embedded in a stained-glass window (the 'Space Window', 1974).
Mount Vernon, Arlington, and the Greater DC Historic Sites -- The Washington Region's Revolutionary and Civil War Heritage
George Washington's Plantation, Robert E. Lee's Confiscated Home, and the Pentagon 9/11 MemorialWashington DC's greater metropolitan area encompasses extraordinary historical sites within 30-45 minutes of downtown: Mount Vernon (16 miles south via the George Washington Memorial Parkway -- George Washington's 8,000-acre plantation on the Potomac, where Washington lived 1754-1799 and is buried; the mansion, working farm, distillery, and museum constitute one of the finest presidential historic sites in the US); Arlington National Cemetery (just across the Potomac -- 639 acres, 400,000+ interments including JFK, Robert Kennedy, the Tomb of the Unknown Soldier, and the Arlington House, former home of Robert E. Lee, confiscated by the Union Army in 1861 when Lee resigned his US Army commission to lead Confederate forces); and the Pentagon Memorial (dedicated 2008, commemorating the 184 victims of the September 11 attack on the Pentagon, adjacent to the Pentagon in Arlington, Virginia).
Arlington House and Robert E. Lee's Decision -- How Confiscation of Lee's Estate Created Arlington National Cemetery
Arlington House -- the Greek Revival mansion built by George Washington Parke Custis (step-grandson of George Washington) on the heights above the Potomac -- became home to Robert E. Lee when he married Mary Anna Custis in 1831. Lee lived at Arlington until April 20, 1861, when he resigned his US Army commission and accepted command of Virginia's Confederate forces -- two days after Virginia voted to secede. The Union Army occupied Arlington House within weeks; Mary Lee fled south and never returned. The Quartermaster General of the Union Army (Montgomery Meigs, who personally loathed Lee for what he considered treason) began burying Union soldiers in the Arlington House gardens in May 1864 -- deliberately surrounding the mansion with graves to ensure the Lee family could never return. The 1,100-acre estate was confiscated by the federal government for unpaid property taxes (on a technicality; a Lee family representative tried to pay, but the government required Mary Lee to pay in person, which she could not do due to arthritis). The Lee family challenged the confiscation in court; in 1882, the Supreme Court ruled in their favor (United States v. Lee), but the estate had 16,000 graves by then. Lee's eldest son sold the property back to the federal government for $150,000.
How to Find Cheap Flights to Washington DC
DC Has Three Airports -- Choose Based on Destination and Budget
Washington DC is served by three airports: Reagan National (DCA, 5 miles from downtown -- most convenient, slot-controlled, higher fares), Washington Dulles International (IAD, 26 miles west -- international gateway, more carriers, United hub), and Baltimore-Washington International (BWI, 32 miles northeast -- Southwest's East Coast hub, consistently lowest fares, MARC commuter rail to Union Station). Compare all three before booking.
BWI Is Almost Always the Cheapest Option -- MARC Rail Connects to DC in 40 Minutes for $9
Baltimore-Washington International (BWI) consistently offers fares 20-40% lower than DCA for comparable routes, primarily due to Southwest's dominant low-cost presence. MARC Penn Line commuter rail connects BWI Airport to Washington Union Station in approximately 38-45 minutes for $9 (much cheaper than Dulles Silver Line Metro, which opened 2022 at a cost of $2.9 billion). For budget-conscious travelers, BWI + MARC is the best Washington DC transportation value.
Spring Cherry Blossom Season (Late March-Early April) Is the Busiest Week of the Year
The National Cherry Blossom Festival (late March-mid April, timed to peak bloom of the 3,800 Japanese flowering cherry trees around the Tidal Basin) is Washington DC's peak tourist week -- hotels charge 2-3x normal rates and flights from major cities sell out 6-8 weeks ahead. Book cherry blossom season travel by February 1 at the latest, or expect significantly higher prices and limited availability.
All Smithsonian Museums Are Free -- Budget Zero for Museum Admission in DC
All 19 Smithsonian Institution museums and galleries in Washington DC have free general admission. Budget Washington DC trips can include 3-5 days of world-class museum visits with zero admission cost: National Air and Space Museum, National Museum of Natural History (Hope Diamond), National Gallery of Art, National Museum of American History, National Museum of African American History and Culture (timed entry passes required, reserved free online), and 14 more. The National Zoo (Smithsonian) is also free.
Airlines Flying to Washington DC Airports (DCA / IAD / BWI)
American Airlines
Reagan National's Dominant Carrier -- DCA Hub and the Shuttle to NYC and BostonAmerican Airlines is the largest carrier at Reagan National (DCA), operating nonstops to its hub cities (DFW, CLT, ORD, MIA, JFK, LAX, SFO) and the historic Washington-New York and Washington-Boston shuttles. American controls approximately 45% of DCA's slots -- DCA is a slot-controlled airport (limited hourly operations by FAA policy), giving American a structural advantage that maintains high fares on DCA routes. American also serves Dulles (IAD) with international connections through its oneworld partners.
Key Routes
CLT to DCA (1h nonstop; DFW to DCA (2h 45m nonstop; ORD to DCA (1h 45m nonstop; LAX to DCA (5h 15m nonstop; BOS to DCA (1h 15m nonstop shuttle; JFK to DCA (1h nonstop
Southwest Airlines
Baltimore-Washington (BWI) -- The Lowest-Cost Washington DC Airport for Southwest's National NetworkSouthwest Airlines operates extensively at Baltimore-Washington International Airport (BWI -- 32 miles northeast of downtown DC, but metro-connected via MARC commuter rail in 30-40 minutes). BWI is Southwest's most significant East Coast hub, with nonstops to the full Southwest national network (LAS, DEN, PHX, MCO, MDW, DAL, HOU, BNA, LAX, and 30+ other markets). For travelers whose destination is flexible between DCA/IAD/BWI, Southwest's BWI fares are consistently 20-40% lower than DCA for the same origin-destination city pairs. Southwest does not appear on aggregators.
Key Routes
MCO to BWI (2h 15m nonstop; MDW to BWI (1h 45m nonstop; LAS to BWI (4h 30m nonstop; DEN to BWI (3h 45m nonstop; LAX to BWI (5h 15m nonstop; DAL to BWI (2h 45m nonstop
United Airlines
Dulles Hub -- United's DC Gateway for International and Transcontinental ConnectionsUnited Airlines operates Washington Dulles International Airport (IAD -- 26 miles west of downtown DC) as a significant hub, with nonstops to United's domestic network (ORD, DEN, IAH, SFO, EWR, LAX) and international destinations across Europe, the Middle East, and Asia. IAD is Washington's primary international airport -- all major intercontinental flights use Dulles, not Reagan National (DCA). United's Star Alliance partners (Lufthansa, ANA, Singapore Airlines) also use Dulles as their DC gateway.
Key Routes
ORD to IAD (1h 45m nonstop; DEN to IAD (3h 45m nonstop; LAX to IAD (5h 15m nonstop; SFO to IAD (5h 15m nonstop; EWR to IAD (1h nonstop
Delta Air Lines
Atlanta Hub and Nationwide Network -- DCA, IAD, and BWI All Served by DeltaDelta Air Lines connects Washington DC to its Atlanta (ATL) hub with multiple daily nonstops at DCA, and also serves Dulles (IAD) and BWI from its national network. Delta's ATL-DCA route is one of the highest-frequency Delta routes on the East Coast -- the Atlanta-Washington business and government travel corridor is among the highest-yield in domestic aviation. Delta also operates nonstops from Minneapolis (MSP), Detroit (DTW), Boston (BOS), and New York (JFK/LGA) to DCA.
Key Routes
ATL to DCA (1h 45m nonstop, many daily; MSP to DCA (2h nonstop; DTW to DCA (1h 30m nonstop; BOS to DCA (1h 15m nonstop
Things to Do in Washington DC
Essential Info for Your Washington DC Trip
District
Washington, DC (District of Columbia — not a US state, though DC residents pay federal taxes)
Airport Codes
DCA (Reagan National, 5mi), IAD (Dulles, 26mi), BWI (Baltimore-Washington, 32mi)
Currency
USD — US Dollar
Time Zone
EST (UTC-5) / EDT (UTC-4) in summer
Metro System
WMATA Metro serves DCA (Blue/Yellow lines) and IAD (Silver Line, $7.25). MARC commuter rail serves BWI ($9, 38-45 min to Union Station).
Smithsonian Museums
All 19 Smithsonian museums: free general admission. NMAAHC requires free timed-entry passes (reserve online in advance).
Cherry Blossoms
Late March-mid April. Peak bloom typically 1-2 weeks. Book flights and hotels by January 1 for blossom season.
Emergency Number
911
Most Popular Airlines
Best Airlines for Domestic & International Routes
Frequently Asked Questions on Flights to Washington DC
Everything you need to know about booking cheap flights to Washington DC (DCA, IAD, BWI)
What airports serve Washington DC?
Washington DC is served by three airports: (1) Ronald Reagan Washington National Airport (DCA) -- 5 miles from downtown, Metro accessible (Blue/Yellow lines), closest and most convenient, but slot-controlled (fewer flights, higher fares); (2) Washington Dulles International Airport (IAD) -- 26 miles west in Virginia, served by Metro Silver Line (opened 2022, $7.25 fare), United hub and international gateway; (3) Baltimore-Washington International Thurgood Marshall Airport (BWI) -- 32 miles northeast in Maryland, served by MARC rail ($9, 38-45 min to Union Station) and WMATA express bus, Southwest's East Coast hub with consistently lowest fares.
What is Washington DC known for?
Washington DC is known as the US capital and home of: (1) the White House, US Capitol, and Supreme Court; (2) 19 free Smithsonian Institution museums (National Air and Space, Natural History, American History, National Gallery of Art, NMAAHC, and more); (3) the National Mall monuments (Lincoln, Vietnam, Korea, WWII); (4) Georgetown (18th-century cobblestone neighborhood); (5) the Kennedy Center for the Performing Arts; (6) the National Cathedral; (7) Mount Vernon (15 miles south); (8) Arlington National Cemetery; and (9) the National Cherry Blossom Festival (late March-April).
Which DC airport is cheapest to fly into?
Baltimore-Washington International (BWI) is almost always the cheapest of DC's three airports, primarily because Southwest Airlines dominates BWI's operations and keeps fares competitive. MARC Penn Line commuter rail from BWI to Washington Union Station costs $9 and takes 38-45 minutes -- the cheapest ground transportation option in the DC area. Dulles (IAD) is mid-range; Reagan National (DCA) is consistently the most expensive due to slot controls limiting competition.
When is the best time to visit Washington DC?
Best weather: April-June and September-October (65-80°F/18-27°C, comfortable for monument walking). Peak demand: Cherry Blossom Festival (late March-early April -- book flights and hotels by January), July 4th, and summer school holidays (June-August). Cheapest fares: January-February and late November (post-Thanksgiving). DC attractions are largely free, making the primary budget variable accommodation -- hotel prices are highest in spring and during major political events (inaugurations, state visits).
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