Check out http://gc.kls2.com. It's called the great circle mapper, and it'll give you an idea of what the shortest path between the two cities is. Just so you know, that flight will take off to the west from Heathrow, fly over Northern Ireland, just south of Iceland, cross the southern end of Greenland and Baffin Island, make landfall around Churchill in Manitoba, and enter the U.S. in western Montana.
Many transatlantic flights take what is known as a "great circle" route, this means to a casual observer they will to appear to fly with a slight curve like a rainbow, rather than a direct straight line. A flight from London to San Francisco will typically fly northwest out of London, then head towards the north of Northern Ireland, pass just south of Iceland and over the tip of Greenland, then the flight will fly over much of northern Canada before entering US airspace, then over the Rocky mountains before descent into California.
The exact routing will be decided by ATC (air traffic control), but most flights from LHR to SFO will fly towards Iceland and Greenland after leaving Heathrow and then back down again.
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Based on known routes and flying at flight level 400 (40,000 feet)
These are approximate because as stated above ATC will clear an IFR route and may make changes to account for traffic etc
EGLL (0.0nm) -SID-> BPK (21.0nm) -UN866-> DIGSU (53.1nm) -UP5->
UMBAG (73.2nm) -UP5-> ELNAB (136.6nm) -UP5-> CUTEL (292.9nm) -UP5->
GIBSU (353.4nm) -UP5-> LAMRO (372.0nm) -UP5-> NIVUN (409.5nm) -P5->
ZOL (501.1nm) -P5-> SOGRA (627.1nm) -P5-> TOTKO (712.6nm) -P5->
TRM (818.8nm) -Z108-> TUXOT (865.5nm) -Z101-> GUBAV (980.9nm) -Z156->
AMIMO (1120.2nm) -P80-> RERDI (1175.1nm) -P80-> PIPUL (1420.7nm) -P80->
ARVOM (1494.5nm) -P80-> LATEN (1540.5nm) -B483-> LUREG (1650.3nm) -B483->
ADOTI (1715.9nm) -B483-> PIBOL (1754.8nm) -B483-> TIMUN (1868.6nm) -B483->
ANODI (2134.6nm) -R705-> MELAM (2181.6nm) -W85-> KUTET (2495.2nm) -W52->
OBEDA (2659.8nm) -W52-> MELUS (2684.6nm) -W52-> MITKI (2860.1nm) -W52->
GIKSI (3209.4nm) -G7-> BALOM (3347.8nm) -G7-> BAGET (3407.1nm) -G7->
LURET (3581.9nm) -R351-> PETIV (3741.8nm) -R351-> POKEP (3972.8nm) -R351->
BEKMI (4043.5nm) -R351-> NISEL (4164.5nm) -R351-> PEMID (4262.8nm) -R351->
RANOP (4415.0nm) -R351-> KUMOG (4460.8nm) -G902-> KURIP (4528.0nm) -G902->
FRENK (4560.7nm) -B244-> OTZ (4713.9nm) -J502-> FAI (5091.1nm) -J515->
HRDNG (5146.7nm) -J502-> RDFLG (5221.9nm) -J515-> ORT (5286.9nm) -J502->
AYZOL (5325.0nm) -J502-> DB (5413.6nm) -J502-> SSR (5634.3nm) -J502->
HOODS (5666.3nm) -J502-> LVD (5758.9nm) -V317-> DOOZI (5817.5nm) -J502->
ANN (5857.5nm) -J502-> HANRY (5889.5nm) -J502-> DUGGS (5999.4nm) -J502->
PRYCE (6054.5nm) -J502-> YZT (6161.2nm) -J523-> INHAM (6284.0nm) -J523->
TOU (6339.8nm) -J501-> WAPTO (6392.0nm) -J501-> HQM (6423.7nm) -J501->
OED (6697.1nm) -J1-> HANDY (6712.1nm) -J126-> RBL (6843.2nm) -STAR->
KSFO San Francisco? (6992.3nm)
Leaving London Heathrow to SF International
EGLL SID BPK N866 DIGSU P5 NONVU Z261 AMIMO P80 LATEN N150 ANODI N611MELAM W85 KUTET G64 EDONI T659 GIKSI G7 LURET R351 KUMOG N735 FRENK B244OTZ J502 FAI J515 HRDNG J502 RDFLG J515 ORT J502 YZT J523 TOU J501 OED J1HANDY J126 RBL STAR KSFO
11 hours
The flight time from London Heathrow Airport to San Francisco International Airport is about 10 hours, 44 minutes.
The flight time from London Heathrow Airport to Indianapolis International Airport is 8 hours.
The average flight time from London Heathrow Airport to Philadelphia International Airport is 7 hours, 5 minutes.
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The flight time from Denver International Airport to London Heathrow Airport is 9 hours, 21 minutes.
The flight distance from Chicago O'Hare International Airport to London Heathrow Airport is about 3,955 miles.
You can book a cheap flight to London Heathrow Airport by using the website skyscanner. Expedia and Travelocity may also have cheap flights to Heathrow Airport.
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