Compare: London→Istanbul (2,501 km) vs London→Athens (2,392 km). London → Athens wins by 109 km (4%). Side-by-side with flight & drive times.
By SnapDistance Team
2,501 km
1,554 miles · Flight: ~3h 38min
2,392 km
1,486 miles · Flight: ~3h 29min
✓ Shorter route
Difference: 109 km (4%) · Flight time difference: ~9 min
Verdict
London → Athens is the smarter pick if travel time and emissions matter most: it is 109 km (4%) shorter, saves about 9 min of flight time, and cuts roughly 28 kg of CO₂ per passenger. Choose London → Istanbul only if the destination itself is the reason for the trip.
London → Athens is the shorter route at 2,392 km, which is 109 km (4%) shorter than London → Istanbul. You would save approximately 9 min in flight time by choosing the shorter route.
| Metric | London → Istanbul | London → Athens |
|---|---|---|
| Distance (km) | 2,501 | 2,392 |
| Distance (miles) | 1,554 | 1,486 |
| Flight time | ~3h 38min | ~3h 29min |
| Driving time | No road estimate | No road estimate |
| Road distance (rough estimate) | Not published | Not published |
| Continuous road link? | No | No |
| Cross-continental | No | No |
| Initial bearing | 106° (ESE) | 120° (ESE) |
| Time-zone shift | +2h | +2h |
| CO₂ – flight (per pax) | ~638 kg | ~610 kg |
| CO₂ – driving (per car) | — | — |
| Fuel cost (est.) | — | — |
Flying from London to Istanbul produces roughly 638 kg of CO₂ per passenger, based on the ICAO/EEA short-haul emission factor of ~0.255 kg per passenger-km. The London → Athens flight emits about 610 kg. Choosing the shorter route saves approximately 28 kg of CO₂ per traveler — equivalent to 1 typical tree-years of carbon sequestration.
The London to Istanbul route covers 2,501 km (1,554 miles), staying within Europe. London (population: 8,982,000) is located in England, United Kingdom, while Istanbul (population: 15,462,452) is in Marmara, Turkey.
The London to Athens route covers 2,392 km (1,486 miles), remaining within Europe. London (population: 8,982,000) is in England, United Kingdom, and Athens (population: 664,046) is in Attica, Greece.
Flying from London to Istanbul takes approximately 3h 38min, while London to Athens takes 3h 29min.
Since both routes depart from London, this comparison is especially useful for travelers deciding between Istanbul and Athens as a destination.
The 109 km difference between these routes is relatively modest, so other factors like ticket prices and schedules may matter more.
Neither route has a road figure we can defend. Yes — you can drive from London to Istanbul by taking your car through the Channel Tunnel (Le Shuttle, Folkestone–Calais, about 35 minutes) or on a cross-Channel ferry. Because part of the trip is a rail or sea crossing, SnapDistance does not publish a single road-distance figure for this pair. Yes — you can drive from London to Athens by taking your car through the Channel Tunnel (Le Shuttle, Folkestone–Calais, about 35 minutes) or on a cross-Channel ferry. Because part of the trip is a rail or sea crossing, SnapDistance does not publish a single road-distance figure for this pair.
Istanbul (Turkey) has a population of 15,462,452 and is located in the Marmara region of Europe. As a major metropolis, it offers extensive international connections and diverse attractions.
Athens (Greece) has a population of 664,046 and is situated in Attica, Europe. This destination offers a more intimate travel experience with unique local culture.
Choose this route if your priority is reaching Istanbul (Turkey) — a city of 15,462,452 in the Marmara region of Europe. Despite being the longer of the two at 2,501 km, it makes sense when Istanbul itself is the destination, the schedule fits better, or ticket prices are noticeably lower. This is a fly-only route in practice — overland travel is not realistic at 2,501 km. The initial bearing is 106° (ESE), so a great-circle flight leaves London heading roughly ESE.
This route is the right call if you are heading to Athens (Greece) — a city of 664,046 in the Attica region of Europe. It is also the shorter of the two at 2,392 km, saving about 9 min of flying and around 28 kg of CO₂ per passenger. Overland travel is not practical for 2,392 km; flying is the realistic mode. Departing London, the great-circle bearing toward Athens is 120° (ESE).
London (51.51°, -0.13°) → Istanbul (41.01°, 28.98°): London keeps Europe/London time and Istanbul keeps Europe/Istanbul time — a gap of about 2 hours, with Istanbul ahead. The exact gap moves when either zone switches to or from daylight saving, so use the live figure in the calculator for your travel dates. London (51.51°, -0.13°) → Athens (37.98°, 23.73°): London keeps Europe/London time and Athens keeps Europe/Athens time — a gap of about 2 hours, with Athens ahead. The exact gap moves when either zone switches to or from daylight saving, so use the live figure in the calculator for your travel dates. Both gaps come from the cities' real IANA zones and move with daylight saving. Both routes have manageable shifts, so jet lag should not be a major factor.
Athens is closer at 2,392 km, which is 109 km (4%) shorter.
2,501 km (1,554 miles). Flight: ~3h 38min.
2,392 km (1,486 miles). Flight: ~3h 29min.
Flying to Athens is faster at ~3h 29min, saving about 9 min compared to Istanbul.
All distances on SnapDistance are calculated using the Haversine formula, which determines the great-circle distance between two points on Earth's surface. This gives the shortest possible distance over the globe, which is the measurement used for aviation and navigation. Actual travel distances by road or rail are typically 20-40% longer due to terrain, borders, and infrastructure routing. Flight times assume 800 km/h cruising speed with 30 minutes for takeoff and landing. Driving estimates use 80 km/h average speed with a 30% road distance factor.