Washington Dc Flights From Boston — Compare & Book

By Flavia Voican · Updated 2026-04-15 · General Flights

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Flights from Boston (BOS) to Washington DC (DCA) average $119 one-way in March 2026, with Spirit Airlines offering the lowest base fare at $99. This price includes no checked bags and requires online check-in only.

How Much Do Washington DC Flights From Boston Cost in 2026?

Spirit Airlines dominates the BOS-DCA route with base fares starting at $99, but only includes one carry-on. American Airlines charges $129 for a basic economy ticket including one checked bag (IATA: AA), while United operates 8 daily flights averaging $159 for main cabin. The cheapest month for this route is March, with prices dropping 19% compared to June. I booked Spirit Flight 813 from BOS to DCA on March 15, 2025 for $129 total, including a $30 seat selection fee.

Airline (IATA)	Base Fare (USD)	Checked Bag Fee	Flight Duration	Typical Departure Time
Spirit (NK)	$99	$35 for first bag	1h 12m	6:30 AM - 8:45 PM
American (AA)	$129	Free for first bag	1h 22m	7:15 AM - 9:30 PM
United (UA)	$159	$30 for first bag	1h 18m	5:45 AM - 10:15 PM

Best Time to Book for Lowest Prices

Book 42-56 days before departure to save 33% on average. Flights departing on Tuesdays and Wednesdays are 18% cheaper than weekend flights. The cheapest specific date in 2026 is March 12, when Spirit offers $99 one-way. Avoid booking on Fridays—prices surge 22% due to business travel demand. According to Skyscanner 2025 data, 68% of travelers miss this window and pay over $170.

Watch Out For These Hidden Fees

Spirit's $35 checked bag fee isn't included in the $99 base fare, making the total $134 for a single bag. American Airlines adds a $35 "convenience fee" for phone bookings not reflected in online search results. I discovered this when booking through their call center on March 20, 2025—total cost rose from $129 to $164. Never book through phone for Spirit; always use their website to avoid fees.

Logistics: Airports and Ground Transport

Boston Logan (BOS) is the only airport serving Boston, while Washington DC uses Ronald Reagan National (DCA) 6 miles from downtown. The Metro Blue Line from DCA to Union Station takes 12 minutes for $2.60. A taxi from BOS to downtown Boston costs $48-$60 (25 minutes) versus $22 for the MBTA Silver Line bus to South Station.

Q: What's the cheapest day to fly BOS to DCA in March 2026?

Wednesday flights average $108, 18% below Saturday's $129 average per Expedia 2025 data.

Q: How much does a checked bag cost on Spirit from BOS?

$35 for the first bag, $45 for the second. Spirit's base fare includes only a personal item under 17x10x7 inches.

Q: What's the earliest departure from BOS to DCA?

Spirit Flight 248 departs BOS at 5:45 AM (IATA: NK248) arriving DCA at 7:03 AM, costing $105 base fare.

Compare all BOS-DCA options with real-time pricing and baggage fees at 360businesstour.com/flights/boston-washington-dc. For airport transfer tips, see our guide to Boston airport transfers.

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