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 · Updated April 7, 2026
2,501 km
1,554 miles · Flight: ~3h 38min · Drive: ~40h 38min
2,392 km
1,486 miles · Flight: ~3h 29min · Drive: ~38h 52min
✓ 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 | ~40h 38min | ~38h 52min |
| Road distance (est.) | ~3,251 km | ~3,110 km |
| Drivable? | Yes | Yes |
| 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) | ~556 kg | ~532 kg |
| Fuel cost (est.) | ~$325 USD | ~$311 USD |
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. For comparison, driving emits roughly 556 kg and 532 kg per car respectively — meaningful only when the car carries multiple passengers.
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. If driving is an option, expect roughly 40h 38min for the first route and 38h 52min for the second.
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.
Both routes are drivable, with road distances of approximately 3,251 km and 3,110 km respectively. For road trips, the shorter route saves roughly 141 km of driving.
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. Driving is realistic at this distance, with an estimated 3,251 km of road and a fuel cost band around $325 USD. 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. Driving is feasible — expect roughly 3,110 km of road and a fuel cost in the $311 USD range. Departing London, the great-circle bearing toward Athens is 120° (ESE).
London (51.51°, -0.13°) and Istanbul (41.01°, 28.98°) sit with a time-zone shift of +2 hours. London (51.51°, -0.13°) and Athens (37.98°, 23.73°) have a +2-hour offset. Both routes have manageable time-zone 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.
📍 Data: Coordinates from OpenStreetMap contributors. Distances calculated using the Haversine formula. Travel times are estimates only. Last verified: April 7, 2026.