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ISC to LHR: distance & flight time
ST MARY\'S (St. Mary's Airport) → London (London Heathrow Airport)
277 mi
446 km · 241 nm
1h 12m
estimated nonstop flight time
Same time
time difference · heading northeast
See live ISC→LHR fares Phone-only fares on this route — call free
Flight time details
277 miles nonstop takes roughly 1h 12m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Both airports share the same local time, so schedules read exactly as flown.
The two airports
- ISC — St. Mary's Airport · ST MARY\'S, United Kingdom
- LHR — London Heathrow Airport · London, United Kingdom
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near ISC
- LEQ · Land's End Airport31 mi away
- PZE · Penzance Heliport37 mi away
- NQY · Newquay Cornwall Airport68 mi away
- PLH · Plymouth City Airport103 mi away
Near LHR
- LGW · London Gatwick Airport25 mi away
- NHT · RAF Northolt6 mi away
- HYC · Wycombe Air Park18 mi away
- FAB · Farnborough Airport19 mi away
Frequently asked questions
How far is ISC from LHR?
The flight distance from ST MARY\'S (ISC) to London (LHR) is 277 miles (446 km, 241 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ISC to LHR?
A nonstop flight takes about 1h 12m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from ISC to LHR?
Nonstop service on ISC–LHR depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 1h 12m nonstop estimate.
What is the cheapest way to fly from ISC to LHR?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ISC–LHR that never appear on search engines, with no booking fees.
Why are some ISC to LHR fares phone-only?
Consolidator contracts let us sell certain ISC–LHR tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.