The sector is held by Alaska Airlines, British Airways, Delta Air Lines and Virgin Atlantic.
Airport pair · hand carry reference
LHR London to SEA Seattle
Heathrow Airport, the United Kingdom, to Seattle Tacoma International, the United States. Computed from the scheduled network held on 2026-09-07.
- Nonstop
- 6.7 times a day
- Great circle
- 7,702 km
- Block, estimated
- 9h 47m
- Door to door
- 16h 32m
What LHR to SEA looks like
The LHR to SEA sector, the carriers on it and the flying time, before anything is promised to anybody.
London LHR to Seattle SEA is an ultra long sector of 7,702 km by great circle, flown nonstop 6.7 times a day.
At the cruise speed this site models for 7,702 km, 880 km an hour, and thirty minutes of taxi at the two ends, the flight blocks at about 9h 47m.
London LHR is a major hub in the network held here, 212 scheduled destinations and 758.3 departures a day. Seattle SEA has 145 destinations and 717.9 departures a day.
Seattle is 8 hours behind of London all year.
The pair sits between the Americas and Europe, a corridor where the site already publishes 36 written lanes that go into customs and ground detail this page does not.
Who flies the sector, and how often
Average daily frequencies on LHR to SEA from the scheduled route statistics, both directions, with the operating carriers named.
| Direction | Flights a day | Flights a week | Operated by |
|---|---|---|---|
| LHR to SEA | 6.71 | 47 | Alaska Airlines, British Airways, Delta Air Lines, Virgin Atlantic |
| SEA to LHR | 5.71 | 40 | Alaska Airlines, British Airways, Delta Air Lines, Virgin Atlantic |
4 carriers are recorded on the sector, so a missed departure is normally a rebooking rather than a lost day.
At 6.7 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 86.9 departures a week on LHR to SEA, 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 9h 47m block time on LHR to SEA. Change any of them in the tool further down and the total moves with them.
| Stage | Allowed | Elapsed |
|---|---|---|
| Collection and the run to LHR | 90 min | 1h 30m |
| At LHR before departure | 180 min | 4h 30m |
| LHR to SEA in the air, estimated | 587 min | 14h 17m |
| Formalities at SEA | 90 min | 15h 47m |
| Delivery run in Seattle | 45 min | 16h 32m |
| Door to door | 992 min | 16h 32m |
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 LHR to SEA is 16h 32m.
A courier who leaves London at 09:00 local is on the ground in Seattle at about 10:47 local and at the door by 13:02 the same day.
Working backwards from a six in the evening handover in Seattle, the last useful departure from London is around 13:58 local.
At 16h 32m the mission is past the sixteen hour duty day a single courier is planned against, so it is quoted with a rest at the far end or with a second courier, and never as a turnaround.
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. 51 of them join LHR to SEA.
| Connecting at | LHR to hub, flights a day | Hub to SEA, flights a day | Track, km | Estimated, gate to gate |
|---|---|---|---|---|
| Reykjavik KEF | 3.43 | 4.29 | 7,706 | 11h 25m |
| Vancouver YVR | 3.43 | 14.86 | 7,784 | 11h 41m |
| Dublin DUB | 20.43 | 1.14 | 7,732 | 11h 41m |
| Calgary YYC | 2.29 | 6.71 | 7,741 | 11h 46m |
| Portland PDX | 1.14 | 22.43 | 8,094 | 12h 03m |
| Amsterdam AMS | 16.14 | 2.43 | 8,210 | 12h 30m |
With 6.7 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.
51 airports connect the two ends on the scheduled network held here. The quickest of the dependable ones is Reykjavik KEF, where the weaker of the two legs still runs 3.4 times a day.
Through KEF the routing covers 7,706 km against the 7,702 km nonstop track and takes about 11h 25m 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 38m more than the nonstop, which is close enough that a connection is worth taking when the nonstop is full or badly timed.
Behind it, Vancouver YVR at 11h 41m and Dublin DUB at 11h 41m hold the same connection, so a booking has three hubs to try before it has to wait for the nonstop.
If nothing suitable leaves London, London LCY is 36 km away by great circle and carries 38 scheduled destinations of its own, which is usually a shorter road transfer than a lost day.
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.
Restricted hours at either end
Widely documented operating restrictions, checked 2026-09-07. Exemptions and seasonal variations exist, so confirm with the carrier before relying on any of them.
London LHR is shut to scheduled movements between 23:30 and 06:00 local, so a collection in London that runs late does not simply catch a later flight, it waits for the morning and loses a working day in Seattle.
London LHR, night restrictions: A night quota system limits movements between 23:30 and 06:00 local. Very few scheduled departures in that window.
Industry within reach of the two ends
Public manufacturing and research sites whose logistics run through LHR or SEA. Listed as industrial geography, not as customers of anyone.
- Leonardo, YeovilHelicopter assembly and support. Support contracts with fixed response times. Logistics through London LHR.
- AstraZeneca, Cambridge and MacclesfieldResearch head office and manufacturing. British research, global trial sites. Logistics through London LHR.
- GSK, Stevenage and WareResearch and inhaled medicine manufacturing. Heathrow is the gate for the whole cluster. Logistics through London LHR.
- Boeing, Everett and RentonWidebody and 737 final assembly. A European supplier base and an American line, eight time zones apart. Logistics through Seattle SEA.
Plan London to Seattle 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 LHR to SEA 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 LHR airport entry
- The SEA airport entry
- Hand carry into the United Kingdom
- Hand carry into the United States
- The written lane, Abu Dhabi to London
- The written lane, Cape Town to London
- The written lane, Doha to London
- The route calculator
More pairs through LHR and SEA: Dublin to London, London to Boston, Amsterdam to London, London to Paris, Madrid to London, London to San Francisco, London to Atlanta, Munich to London.