Back Bay skyline across the Charles River from the Longfellow Bridge. Flights from Seattle to Boston

Route guide

Cheap Flights from Seattle to Boston

Search partner fares from Seattle to Boston, with Sea-Tac security options before you fly and the shuttle, Blue Line and ferry links out of Logan.

SEA to BOS · 2,489 mi · 5h 51m est.

SEA to BOS
2,489 miles
5h 51m nonstop (estimated)
6 airlines in our fare results

Photo: King of Hearts, CC BY-SA 4.0, via Wikimedia Commons

Seattle to Boston flight insights

Average flight time

~5h 51m (estimated)

SEA → BOS

Cheapest cached price

$234

Checking live fares…

Prices shown may not be current. Last checked: Oct 18, 2026.

Planning a trip from Seattle to Boston? The average flight time on this route is ~5h 51m (estimated). The lowest fare we recorded on this route recently was $234 (last checked Oct 18, 2026); today's live fare for your dates can differ.

Seattle to Boston covers a straight-line distance of about 2,489 miles. Based on that distance, a nonstop flight would take approximately ~5h 51m (estimated). Actual flight time varies by airline, aircraft and routing.

Seattle to Boston at a glance

SEA to BOS is about 2,489 miles in a straight line. The curved line is an illustration; the route your airline flies may differ.

Route Quick Facts

Quick facts for flights from Seattle to Boston on Eazair
Origin	Seattle (SEA)
Destination	Boston (BOS)
Average Flight Time	~5h 51m (estimated)
Current Lowest Fare	$234
Fares Last Checked	Oct 18, 2026
Distance	2,489 miles (SEA to BOS)
Time in Boston	3 hours ahead of Seattle
Airlines in our fare results	6

Local time in Boston is 3 hours ahead of Seattle. Seattle is on Pacific Time, Boston on Eastern Time.

Flight deals from Seattle to Boston

Flights from Seattle-Tacoma International (SEA) to Boston Logan International (BOS) are what this page compares. JetBlue, Delta, American, Southwest, United and Sun Country have appeared in EazAir's fare checks for this route. Logan terminals, taken from each airline's own page: Terminal C for JetBlue, Terminal B for American and Southwest, Terminal A or E for Delta. TF Green Airport is a separate airport, reached by the MBTA's Providence/Stoughton Commuter Rail line from South Station.

SEA Spot Saver lets you reserve a free security time at Checkpoint 4 from 4 a.m. to 10 p.m., and SEA says you can book up to five days before your flight, for groups of up to 10. TSA PreCheck is listed at Checkpoint 3 from 4 a.m. to 8 p.m., with CLEAR at Checkpoint 1. If a rideshare drops you on the baggage claim level, take the elevator or escalator up to ticketing.

The free Massport Shuttle picks up at every Logan terminal and runs to Airport station on the MBTA Blue Line, where a fare applies. Change at State for the Orange Line or at Government Center for the Green Line. The Silver Line SL3 also leaves Airport station for Chelsea, with Commuter Rail and buses there. MBTA ferries run from the Logan Airport Ferry Terminal to Long Wharf, Lovejoy Wharf (North Station), Hingham and Hull, and tickets are sold at fare machines, in the mTicket app or on board.

EazAir's first 11 fare checks for SEA to BOS, from 11 Sep to 16 Oct 2026, each looked for the lowest one-way economy fare for one adult, departing 30 days later. The 11 checks returned 5 different results, the highest less than one and a half times the lowest, with the lowest on 28 Sep. United Basic Economy and Sun Country's base fare leave out a full-size carry-on. Search your own dates, and check the final price, bags and fare rules on the partner site before you pay.

Airports for Seattle to Boston flights

Departure · Seattle

Seattle-Tacoma International (SEA)

Pacific Time

Arrival · Boston

Logan International (BOS)

Eastern Time

About Boston

Areas to know in Boston

Back Bay
North End
Beacon Hill

Weather in Boston

Four distinct seasons: cold, snowy winters and warm, humid summers, with fall foliage drawing visitors through October.

Seattle to Boston: airport and fare guide

Checked on 17 Oct 2026 against the airport, airline and transit pages listed under Sources. Airports and airlines change these details, so confirm them with your airline before you fly.

TF Green Airport is a separate airport. The MBTA says the Providence/Stoughton Commuter Rail line from South Station connects to it.

Paine Field (PAE) in Everett, north of Seattle, is a separate airport with its own passenger terminal. Check that your ticket says SEA if you plan to use Sea-Tac.

Leaving from Seattle-Tacoma International (SEA)

Airline	SEA gates
Delta	S and A gates
United	S and A gates
Other airlines	Check your boarding pass or airline app.

Take the Link light rail 1 Line to SeaTac/Airport station. Sound Transit says the pedestrian bridge from the station is open 24 hours, and SEA runs a free Train-to-Plane shuttle from 5 a.m. to midnight.
SEA says app-based rideshares drop off at the terminal on the airport drives. If you are dropped on the baggage claim level, take the elevator or escalator up to ticketing.
SEA says Checkpoints 1, 2 and 3 are closest to the A and S gates, and lists Checkpoint 4 as open 24 hours. SEA says checkpoint hours may change.
SEA lists TSA PreCheck at Checkpoint 3 from 4 a.m. to 8 p.m. CLEAR is at Checkpoint 1, which SEA lists as open from 4 a.m. to 8 p.m.
SEA Spot Saver is a free security time reservation, offered at Checkpoint 4 from 4 a.m. to 10 p.m. SEA says you can book up to five days before your flight, for groups of up to 10.
SEA advises arriving two hours before a domestic departure and says over a third of daily passengers arrive before 9 a.m. SEA is working to restore live wait times on the flySEA app and website, so check the signs in the terminal.

Arriving at Boston Logan International (BOS)

Airline	Logan terminal
American	Terminal B, gates B4 to B22.
Delta	Terminal A and Terminal E for domestic flights. Check the Fly Delta app or My Trips for yours.
JetBlue	Terminal C for domestic flights and international departures. International arrivals use Terminal E.
Southwest	Terminal B.
Other airlines	Check your boarding pass or airline app.

Taken from each airline's own page on 17 Oct 2026, as Massport's airline list could not be checked. Terminals can change, so confirm yours with your airline.

The MBTA says the Silver Line SL1 bus and the free Massport Shuttle stop at every Logan terminal.
Delta runs a shuttle bus between Terminal A, near gates A13 to A22, and Terminal E, normally at gate E13, from 4:30 a.m. to 10:30 p.m. daily.
JetBlue lists Terminal C for its domestic flights and international departures, and Terminal E for international arrivals.

Getting from BOS	Where to board	Where it goes
MBTA Silver Line SL1	Stops at every Logan terminal. The MBTA says service from the airport is always free.	South Station, for the Red Line and Commuter Rail.
Massport Shuttle and MBTA Blue Line	The free Massport Shuttle picks up at every terminal and runs to Airport station. A fare applies on the Blue Line.	State and Government Center. Change at State for the Orange Line or at Government Center for the Green Line.
MBTA Silver Line SL3	Airport station, reached on the free Massport Shuttle.	Chelsea, with Commuter Rail and bus connections at Chelsea station.
MBTA ferry	Logan Airport Ferry Terminal. Buy tickets at fare machines, in the mTicket app, or on board.	Long Wharf, Lovejoy Wharf (North Station), Hingham and Hull, with more service in summer.

What the lowest fares include

Fare	Carry-on	Checked bag	Seat	Changes
Delta Main Basic	Delta says every passenger can bring one carry-on and one personal item free.	Delta charges for checked bags on domestic flights unless you qualify for a waiver, such as Medallion status or an eligible Delta SkyMiles American Express card.	Assigned after check-in. You may be able to buy a seat ahead of time for a fee.	Refunds are not allowed after the 24-hour risk-free cancellation window. Delta says a change or cancellation may be possible for a fee, with any value left as an eCredit.
American Basic Economy	Included, plus a personal item.	Not included, except for some AAdvantage status members and eligible cardmembers.	A free seat is assigned at check-in, or you can pay to choose one.	Generally not allowed. American describes a 24-hour window and some credit options on its Basic Economy page.
United Basic Economy	Not included on domestic flights. One personal item only, unless you are a MileagePlus Premier member, travel with one, or hold a qualifying MileagePlus card.	Not included; check United's bag fee calculator.	Assigned by United before boarding.	Changes may not be allowed. Refund if cancelled within 24 hours of booking, under United's 24-hour policy; after that, partial travel credit.
Southwest Basic	Southwest's policy allows one carry-on and one personal item.	Checked bag fees apply to Basic fares.	A free Standard seat is assigned at check-in. Preferred and Extra Legroom seats cost extra.	Only by upgrading to a Choice fare or higher. Cancelling at least 10 minutes before departure gives a flight credit, which for Basic expires 6 months from booking.
JetBlue Main Base (bookings made after 29 Jul 2026)	Included, plus a personal item.	Not included.	Costs extra.	Change fee plus any fare difference. Cancelling gives travel credit minus a fee.
Sun Country base fare	Not included. The base fare includes a personal item.	Not included.	Costs extra to choose, or a seat is assigned at check-in.	A change fee and any fare difference may apply. Sun Country says to cancel the original reservation before departure to change the ticket.

Based on the airlines' own pages, checked on 17 Oct 2026. Fees are left out because they change often. Check the final price, bags and fare rules on the partner site before you pay.

How EazAir measured fares on this route

EazAir's first 11 fare checks from Seattle to Boston ran from 11 Sep to 16 Oct 2026. For the return direction, Boston to Seattle, EazAir's first 8 checks ran from 13 Sep to 12 Oct 2026. Each check asked partner travel sites for the lowest one-way economy fare for one adult, departing 30 days after the check. Results can include connecting flights. The highest result was less than one and a half times the lowest. The 11 checks returned 5 different results. The lowest result came on 28 Sep. That is a small sample, so it shows that prices move, not when they are lowest. Search your own dates for current prices.

Sources

SEA: Security screening and checkpoints (no date shown, accessed 17 Oct 2026)
SEA: SEA Spot Saver (no date shown, accessed 17 Oct 2026)
SEA: Estimated checkpoint wait times (no date shown, accessed 17 Oct 2026)
SEA: All aboard the SEA Underground (September 2, 2025, accessed 17 Oct 2026)
SEA: Public transit, Link light rail (no date shown, accessed 17 Oct 2026)
SEA: App-based rideshare (no date shown, accessed 17 Oct 2026)
Sound Transit: SeaTac/Airport Station (no date shown, accessed 17 Oct 2026)
MBTA: Logan Airport (no date shown, accessed 17 Oct 2026)
JetBlue: Boston airport information (no date shown, accessed 17 Oct 2026)
Delta: Boston airport update (no date shown, accessed 17 Oct 2026)
American: Boston airport information (no date shown, accessed 17 Oct 2026)
Southwest: Airport information, Boston Logan (no date shown, accessed 17 Oct 2026)
Delta: Delta Main Basic (no date shown, accessed 17 Oct 2026)
Delta: Fares and discounts (no date shown, accessed 17 Oct 2026)
Delta: Carry-on baggage (no date shown, accessed 17 Oct 2026)
Delta: Bags (no date shown, accessed 17 Oct 2026)
American Airlines: Basic Economy (no date shown, accessed 17 Oct 2026)
United: Basic Economy FAQ (no date shown, accessed 17 Oct 2026)
Southwest: Fare information (no date shown, accessed 17 Oct 2026)
Southwest: Assigned seating (no date shown, accessed 17 Oct 2026)
Southwest: Carry-on baggage policy (no date shown, accessed 17 Oct 2026)
Southwest: Fare types and benefits (no date shown, accessed 17 Oct 2026)
JetBlue: Fare options (no date shown, accessed 17 Oct 2026)
Sun Country Stories: Your first Sun Country flight? Here's what to expect from booking to boarding (Jul 10, 2025, accessed 17 Oct 2026)
Sun Country: Contract of Carriage (Updated October 15, 2025, accessed 17 Oct 2026)
EazAir fare checks for SEA to BOS, 11 Sep 2026 to 16 Oct 2026; BOS to SEA, 13 Sep 2026 to 12 Oct 2026

Frequently asked questions

What is SEA Spot Saver?

It is a free security time reservation at Sea-Tac's Checkpoint 4, offered from 4 a.m. to 10 p.m. SEA says you can book up to five days before your flight, for groups of up to 10.

Where is TSA PreCheck at Sea-Tac?

SEA lists TSA PreCheck at Checkpoint 3 from 4 a.m. to 8 p.m. CLEAR is at Checkpoint 1, and SEA says checkpoint hours may change.

How do I reach the MBTA subway from Logan?

Ride the free Massport Shuttle from your terminal to Airport station, then take the Blue Line. It connects with the Orange Line at State and the Green Line at Government Center.

Is there a ferry from Logan Airport?

Yes. MBTA ferries leave the Logan Airport Ferry Terminal for Long Wharf, Lovejoy Wharf (North Station), Hingham and Hull, with more service in summer.

Do the lowest fares from Seattle to Boston include a carry-on?

JetBlue Main Base, Delta Main Basic, American Basic Economy and Southwest Basic include one. United Basic Economy on domestic flights and Sun Country's base fare allow only a personal item.

How far is Seattle from Boston?

SEA and BOS are about 2489 miles apart in a straight line. Flight times vary by airline, direction and routing, so check the scheduled time shown with each result.

Airline bag fees

Baggage allowances differ significantly between fare classes (Basic/Light vs. Standard/Flex) and can change over time. Always verify the exact allowance for your specific fare with the airline before you fly.

Checked bag fees from each airline's own website
Airline	Carry-on, basic economy	1st checked bag	2nd checked bag	Source
American Airlines	Included	$45	$55	aa.com, Sep 24, 2026
United Airlines	Not included	$40	$50	united.com, Sep 24, 2026
Delta Air Lines	Included	$45	$55	delta.com, Sep 24, 2026
Southwest Airlines	Included	$45	$55	southwest.com, Oct 27, 2026
JetBlue	Included	$45	$59	jetblue.com, Sep 24, 2026
Alaska Airlines	Included	$45	$55	alaskaair.com, Sep 24, 2026
Frontier Airlines	Not included	Varies	Varies	flyfrontier.com, Sep 24, 2026
Sun Country Airlines	Not included	Varies	Varies	suncountry.com, Sep 24, 2026

Domestic US fees per bag, each way, when paid online in advance. "Varies" means the airline prices bags by route and date.

Travel tips

Arrive early for domestic flights

TSA generally recommends arriving at least 2 hours before a domestic departure, more at larger hub airports during peak travel periods.

Pack a mixed carry-on

Keep a change of clothes, chargers, and any essentials in your carry-on rather than only your checked bag, in case of a delay or a bag that doesn't arrive with you.

Ease jet lag on longer routes

On longer cross-country flights, adjusting your sleep schedule a day or two before departure and staying hydrated in flight can reduce jet lag on arrival.

Screenshot your confirmation

Save a screenshot or PDF of your booking confirmation and boarding pass before you travel, in case you lose signal or battery at the airport.

Check in online when it opens

Most airlines open online check-in 24 hours before departure. Checking in early can help with seat selection and, on some airlines, boarding group assignment.