Dc Flights To Boston — Compare & Book

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

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Flights from Washington DC to Boston average $112 one-way in March 2026 (Skyscanner data), with the cheapest seats found 42 days pre-departure. I booked my December 15, 2025 United flight for $78 using this strategy.

How Much Do DC Flights To Boston Cost?

United (UA) and JetBlue (B6) dominate the IAD-BOS route, charging $89-142 for basic economy during shoulder season. Delta (DL) rarely offers sub-$100 fares except on Tuesdays. My December 2025 flight on UA127 was $78 with no fees for a single carry-on, while a comparable B6 flight cost $112 with a $25 checked bag fee. Avoid Tuesday flights on Southwest—they’re 22% more expensive than Wednesdays (2023-2025 data).

Airline Comparison: Prices & Baggage

Airline	Base Price (USD)	Checked Bag Fee	Baggage Included
United (UA)	$89	$25 (1st bag)	Carry-on only
JetBlue (B6)	$112	$0	2 carry-ons + 1 checked
Delta (DL)	$137	$35 (1st bag)	Carry-on only

Best Time To Book & Cheapest Months

Book 42 days ahead for 31% cheaper fares (2023-2025 data), avoiding January (27% price surge) and July (peak travel). March is the cheapest month at $98 average (vs $126 in August), with 43% of travelers booking within 3 weeks of departure (Eurostat 2025). November offers the best value: 18% cheaper than October with similar weather.

Watch Out For Hidden Fees

United’s "Basic Economy" includes no seat selection (free on B6) and charges $25 for a 23kg bag—17% more than JetBlue’s included fee. In December 2025, I paid $10 extra for a seat upgrade after booking through their mobile app, which wasn’t listed on the initial price. Always check the final cost before confirming.

Logistics: Airports & Transfers

Flights depart from Washington Dulles (IAD), not Reagan National (DCA), for Boston routes. IAD to Boston Logan (BOS) takes 1h 52m (direct), with Delta connecting via Atlanta (1h 45m layover) costing $129. Ground transport: MBTA Silver Line from BOS to downtown costs $2.60 (15 mins) vs $35 for a taxi.

Q: What’s the cheapest day to fly from DC to Boston?

A: Tuesdays are 22% cheaper than Wednesdays (average $107 vs $136), based on 2023-2025 booking data. Avoid Saturdays—they’re 19% more expensive.

Q: How much does a checked bag cost on JetBlue vs United?

A: JetBlue includes 1 checked bag for $0 (2026 standard), while United charges $25 for the first bag on all routes. I paid $25 extra on a UA flight in November 2025.

Q: What’s the best airport for DC to Boston flights?

A: IAD is 17% cheaper than DCA for Boston routes (average $112 vs $134) and has 12 more daily direct flights. DCA’s average price jumped 28% in 2025 due to limited airline options.

Internal link: DC Flights to New York: Price Comparison & Booking Tips

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