The sector is held by Alaska Airlines, Delta Air Lines and JetBlue Airways.
Airport pair · hand carry reference
SEA Seattle to BOS Boston
Seattle Tacoma International, the United States, to Logan International, the United States. Computed from the scheduled network held on 2026-09-07.
- Nonstop
- 11.9 times a day
- Great circle
- 4,006 km
- Block, estimated
- 5h 20m
- Door to door
- 12h 05m
What SEA to BOS looks like
The SEA to BOS sector, the carriers on it and the flying time, before anything is promised to anybody.
Seattle SEA to Boston BOS is a long haul sector of 4,006 km by great circle, flown nonstop 11.9 times a day.
At the cruise speed this site models for 4,006 km, 880 km an hour, and thirty minutes of taxi at the two ends, the flight blocks at about 5h 20m.
Seattle SEA is a large airport in the network held here, 145 scheduled destinations and 717.9 departures a day. Boston BOS has 194 destinations and 653.7 departures a day.
Boston is 3 hours ahead of Seattle all year.
The pair sits inside the Americas, a corridor where the site already publishes 13 written lanes that go into customs and ground detail this page does not.
Who flies the sector, and how often
Average daily frequencies on SEA to BOS from the scheduled route statistics, both directions, with the operating carriers named.
| Direction | Flights a day | Flights a week | Operated by |
|---|---|---|---|
| SEA to BOS | 11.86 | 83 | Alaska Airlines, Delta Air Lines, JetBlue Airways |
| BOS to SEA | 11.57 | 81 | Alaska Airlines, Delta Air Lines, JetBlue Airways |
3 carriers are recorded on the sector, so a missed departure is normally a rebooking rather than a lost day.
At 11.9 times a day there is usually another departure within a few hours, which is what makes a same day booking on this pair realistic.
Between them the two directions put about 164 departures a week on SEA to BOS, which is the number that decides whether a seat can be found today or on Thursday.
The clock from collection to signature
The same ground timings the route calculator starts from, applied to the 5h 20m block time on SEA to BOS. Change any of them in the tool further down and the total moves with them.
| Stage | Allowed | Elapsed |
|---|---|---|
| Collection and the run to SEA | 90 min | 1h 30m |
| At SEA before departure | 180 min | 4h 30m |
| SEA to BOS in the air, estimated | 320 min | 9h 50m |
| Formalities at BOS | 90 min | 11h 20m |
| Delivery run in Boston | 45 min | 12h 05m |
| Door to door | 725 min | 12h 05m |
On the desk standard ground timings, ninety minutes to collect and reach the airport, three hours at the airport before departure, ninety minutes of arrival formalities and a forty five minute delivery run, the door to door figure for SEA to BOS is 12h 05m.
A courier who leaves Seattle at 09:00 local is on the ground in Boston at about 17:20 local and at the door by 19:35 the same day.
Working backwards from a six in the evening handover in Boston, the last useful departure from Seattle is around 07:25 local.
At 12h 05m the mission uses most of a sixteen hour duty day, which leaves no room for a delay before a rest at the far end becomes the honest answer.
When the nonstop does not work
Every airport that joins the two ends, ranked by when they land, among the ones whose weaker leg is dependable enough to plan on. Connection time is allowed for the size of the hub. 60 of them join SEA to BOS.
| Connecting at | SEA to hub, flights a day | Hub to BOS, flights a day | Track, km | Estimated, gate to gate |
|---|---|---|---|---|
| Milwaukee MKE | 2.29 | 2.86 | 4,100 | 7h 14m |
| Detroit DTW | 7.86 | 8.71 | 4,108 | 7h 17m |
| Toronto YYZ | 2 | 7.71 | 4,023 | 7h 17m |
| Cleveland CLE | 2.43 | 5.29 | 4,147 | 7h 18m |
| Calgary YYC | 6.57 | 1.71 | 4,092 | 7h 22m |
| Minneapolis MSP | 11.43 | 7.71 | 4,049 | 7h 25m |
With 11.9 times a day on the nonstop, a connection here is a disruption plan rather than a routing, and it is listed because a closed runway or a cancellation wave is exactly when nobody has time to work it out.
60 airports connect the two ends on the scheduled network held here. The quickest of the dependable ones is Milwaukee MKE, where the weaker of the two legs still runs about twice a day.
Through MKE the routing covers 4,100 km against the 4,006 km nonstop track and takes about 7h 14m in the air and on the ground at the hub, allowing 60 minutes to connect at an airport of that size.
That is only 1h 54m more than the nonstop, which is close enough that a connection is worth taking when the nonstop is full or badly timed.
Behind it, Detroit DTW at 7h 17m and Toronto YYZ at 7h 17m hold the same connection, so a booking has three hubs to try before it has to wait for the nonstop.
If nothing suitable leaves Seattle, Victoria YYJ is 157 km away by great circle and carries 22 scheduled destinations of its own, which is usually a shorter road transfer than a lost day.
Industry within reach of the two ends
Public manufacturing and research sites whose logistics run through SEA or BOS. Listed as industrial geography, not as customers of anyone.
- Boeing, Everett and RentonWidebody and 737 final assembly. A European supplier base and an American line, eight time zones apart. Logistics through Seattle SEA.
- Moderna, Cambridge, MassachusettsMessenger RNA research and manufacturing. Kendall Square, twenty minutes from Logan. Logistics through Boston BOS.
Plan Seattle to Boston yourself
The same tool the dispatchers use, open to anybody and free. It is loaded with this pair already. Change either end, add a stopover or a preferred airline, and it works out the connection, the transit and the door to door clock, with the real departures underneath. Put it on your own site if it is useful to you.
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Restrictions
Where this came from, and where to look next
- Carriers and frequencies: AeroDataBox scheduled route statistics, retrieved 2026-09-07. Average daily flights, not a timetable.
- Distances: great circle from published coordinates. They read short against a flown track, which is why the block time above applies a factor to them.
- Block and connection times: the same model the route calculator lower down this page runs, at the same rounding.
- Restrictions: the airport notes file, checked 2026-09-07.
- Industrial sites: public company information. Nothing here says or implies that any company named is a customer of any courier operator.
Who publishes this. OnBoard Courier is a placement desk in Dubai. An assignment is carried out by a vetted partner operator, with the desk as the single point of contact from the quote to the signature. This page exists because our own dispatchers need the answer for SEA to BOS in the twenty minutes before a promise is made, and a reference only one operator can read is not a reference. Free to read, quote and cite. Found an error? Tell us and we will correct it.
If you need something moved rather than looked up, the desk prices a hand carry in fifteen minutes.
- The SEA airport entry
- The BOS airport entry
- Hand carry into the United States
- The written lane, Dubai to Seattle
- The written lane, Seattle to Nagoya
- The written lane, Boston to Zurich
- The route calculator
More pairs through SEA and BOS: Boston to Atlanta, London to Boston, San Francisco to Boston, Chicago to Boston, Paris to Boston, Boston to Madrid, Amsterdam to Boston, Boston to Detroit.