Seattle skyline with the Space Needle and Mount Rainier, seen from Queen Anne Hill. Flights from Boston to Seattle

Route guide

Cheap Flights from Boston to Seattle

Compare partner fares from Boston to Seattle-Tacoma International, with Logan terminals for American, Southwest and Delta and the pickup points at Sea-Tac.

BOS to SEA · 2,489 mi · 5h 51m est.

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

Photo: Daniel Schwen, CC BY-SA 4.0, via Wikimedia Commons

Boston to Seattle flight insights

Average flight time

~5h 51m (estimated)

BOS → SEA

Cheapest cached price

$199

Checking live fares…

Prices shown may not be current. Last checked: Oct 27, 2026.

Planning a trip from Boston to Seattle? The average flight time on this route is ~5h 51m (estimated). The lowest fare we recorded on this route recently was $199 (last checked Oct 27, 2026); today's live fare for your dates can differ.

Boston to Seattle 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.

Boston to Seattle at a glance

BOS to SEA 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 Boston to Seattle on Eazair
Origin	Boston (BOS)
Destination	Seattle (SEA)
Average Flight Time	~5h 51m (estimated)
Current Lowest Fare	$199
Fares Last Checked	Oct 27, 2026
Distance	2,489 miles (BOS to SEA)
Time in Seattle	3 hours behind Boston
Airlines in our fare results	5

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

Flight deals from Boston to Seattle

Boston Logan International (BOS) is the departure airport here, and Seattle-Tacoma International (SEA) is the arrival. Southwest, Delta, American, United and Sun Country have appeared in EazAir's fare checks for this route. American and Southwest both list Terminal B at Logan, and a SEA Underground guide dated 2 Sep 2025 places Delta and United at the S and A gates in Seattle. Paine Field (PAE) in Everett is a different airport, so check that your ticket says SEA.

On the MBTA Blue Line, get off at Airport station and take the free Massport Shuttle, which stops at every Logan terminal. MBTA ferries also serve the Logan Airport Ferry Terminal from Long Wharf, Lovejoy Wharf, Hingham and Hull, with more service in summer. American lists its Terminal B ticket counters as open daily from 3 a.m. to 9 p.m. In Terminal E, TSA said the E3 checkpoint opened with seven screening lanes, with E2 as overflow when volumes are heavy.

Lyft and UberX pick up on the 3rd floor of the SEA parking garage: cross a skybridge one level below ticketing and one level above baggage claim, then go down one level. Uber Black and other premium rides meet you at the baggage claim door you choose in the app. Taxis wait on that same 3rd floor at the north and south curbs. Metered cabs have three-digit numbers and one color, while flat-rate cabs charge by zip code and carry four-digit numbers and two colors.

Between 13 Sep and 12 Oct 2026, EazAir ran its first 8 fare checks for BOS to SEA, each for the lowest one-way economy fare for one adult, departing 30 days later. The 8 checks returned 7 different results, with the highest less than one and a half times the lowest, and the lowest result came on 12 Oct. Southwest Basic, Delta Main Basic and American Basic Economy each include a carry-on. Search your own dates, and check the final price, bags and fare rules on the partner site before you pay.

Airports for Boston to Seattle flights

Departure · Boston

Logan International (BOS)

Eastern Time

Arrival · Seattle

Seattle-Tacoma International (SEA)

Pacific Time

About Seattle

Areas to know in Seattle

Capitol Hill
Ballard
Fremont

Weather in Seattle

Mild, wet winters and dry, mild summers. The Pacific Northwest's rainy reputation is strongest from October through April.

Boston to Seattle: 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.

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.

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

Leaving from 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.
Southwest	Terminal B.
Other airlines	Check your boarding pass or airline app.

The SL1 bus stops at every Logan terminal, and the MBTA says transfers from the Red Line to the SL1 are free when you head to the airport.
On the Blue Line, get off at Airport station and take the free Massport Shuttle, which stops at every terminal.
MBTA ferries serve the Logan Airport Ferry Terminal from Long Wharf, Lovejoy Wharf, Hingham and Hull, with more service in summer.
JetBlue asks travelers at Logan to arrive 2 hours before domestic flights and 3 hours before international flights.
Delta says its domestic flights leave from both Terminal A and Terminal E, so check the Fly Delta app or My Trips before you go through security.
JetBlue lists Logan ticket counter hours of 2:30 a.m. to 11:30 p.m. American lists its Terminal B ticket counters as open daily from 3 a.m. to 9 p.m.
When the E3 checkpoint in Terminal E opened, TSA said it had seven screening lanes and that the E2 checkpoint would serve as overflow when volumes are heavy.

Arriving at 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.

From SEA's SEA Underground guide dated 2 Sep 2025, which says Delta, United and almost all international airlines use the S and A gates. Gates can change, so check your boarding pass.

SEA has one terminal with six concourses: A, B and S at the south end, and C, D and N at the north end.
The N and S concourses are not connected to the other gates, so you reach them on the SEA Underground train. SEA says a train arrives every three minutes.
The Blue Line links the S, B and A concourses, the Green Line links N, C and D, and the Yellow Line shuttles between the A and D stations only.
SEA says every security checkpoint gives access to all gates.

Getting from SEA	Where to board	Where it goes
Link light rail 1 Line	From baggage claim, go up to the fourth floor, cross the skybridge to the parking garage and follow the signs to SeaTac/Airport station. A free Train-to-Plane shuttle runs from 5 a.m. to midnight. A fare applies on the train.	Downtown Seattle, with the line running from Federal Way to Lynnwood. SEA says the ride from downtown Seattle takes 38 minutes.
Rideshare (Lyft, UberX)	3rd floor of the parking garage. Cross a skybridge, one level below ticketing and one level above baggage claim, then go down one level.	Wherever you booked.
Uber Black and other premium rides	The baggage claim level door you choose in the app.	Wherever you booked.
Taxis	3rd floor of the parking garage, at the north and south curbs.	Metered taxis have three-digit numbers and one color. Flat-rate taxis charge by zip code and have four-digit numbers and two colors.

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.
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 8 fare checks from Boston to Seattle ran from 13 Sep to 12 Oct 2026. For the return direction, Seattle to Boston, EazAir's first 11 checks ran from 11 Sep to 16 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 8 checks returned 7 different results. The lowest result came on 12 Oct. That is a small sample, so it shows that prices move, not when they are lowest. Search your own dates for current prices.

Sources

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)
TSA: International checkpoint opens in Logan Terminal E (no date shown, accessed 17 Oct 2026)
SEA: Security screening and checkpoints (no date shown, accessed 17 Oct 2026)
SEA: All aboard the SEA Underground (September 2, 2025, accessed 17 Oct 2026)
SEA: Terminal overview (no date shown, 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)
SEA: Metered and flat rate taxis (no date shown, accessed 17 Oct 2026)
Sound Transit: 1 Line, Lynnwood to Federal Way (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)
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 BOS to SEA, 13 Sep 2026 to 12 Oct 2026; SEA to BOS, 11 Sep 2026 to 16 Oct 2026

Frequently asked questions

Where do American and Southwest fly from at Logan?

American lists Terminal B, gates B4 to B22, and Southwest also lists Terminal B at Boston Logan. Delta says its domestic flights use Terminal A and Terminal E.

Can I take a ferry to Logan Airport?

Yes. MBTA ferries serve the Logan Airport Ferry Terminal from Long Wharf, Lovejoy Wharf, Hingham and Hull, with more service in summer.

Where do I get an Uber or Lyft at Sea-Tac?

SEA says Lyft and UberX pick up on the 3rd floor of the parking garage, reached by skybridge. Uber Black and other premium rides meet riders at the baggage claim door chosen in the app.

How do I tell taxi types apart at Sea-Tac?

SEA says metered taxis have three-digit vehicle numbers and one color, while flat-rate taxis have four-digit numbers and two colors and charge by zip code.

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

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

How far is Boston from Seattle?

BOS and SEA 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.