Compare: London→Rome (1,434 km) vs London→Barcelona (1,139 km). London → Barcelona wins by 295 km (21%). Side-by-side with flight & drive times.
By SnapDistance Team
1,434 km
891 miles · Flight: ~2h 18min
1,139 km
708 miles · Flight: ~1h 55min
✓ Shorter route
Difference: 295 km (21%) · Flight time difference: ~23 min
Verdict
London → Barcelona is the smarter pick if travel time and emissions matter most: it is 295 km (21%) shorter, saves about 23 min of flight time, and cuts roughly 76 kg of CO₂ per passenger. Choose London → Rome only if the destination itself is the reason for the trip.
London → Barcelona is the shorter route at 1,139 km, which is 295 km (21%) shorter than London → Rome. You would save approximately 23 min in flight time by choosing the shorter route.
| Metric | London → Rome | London → Barcelona |
|---|---|---|
| Distance (km) | 1,434 | 1,139 |
| Distance (miles) | 891 | 708 |
| Flight time | ~2h 18min | ~1h 55min |
| 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 | 133° (SE) | 170° (S) |
| Time-zone shift | +1h | +1h |
| CO₂ – flight (per pax) | ~366 kg | ~290 kg |
| CO₂ – driving (per car) | — | — |
| Fuel cost (est.) | — | — |
Flying from London to Rome produces roughly 366 kg of CO₂ per passenger, based on the ICAO/EEA short-haul emission factor of ~0.255 kg per passenger-km. The London → Barcelona flight emits about 290 kg. Choosing the shorter route saves approximately 76 kg of CO₂ per traveler — equivalent to 4 typical tree-years of carbon sequestration.
The London to Rome route covers 1,434 km (891 miles), staying within Europe. London (population: 8,982,000) is located in England, United Kingdom, while Rome (population: 2,873,000) is in Lazio, Italy.
The London to Barcelona route covers 1,139 km (708 miles), remaining within Europe. London (population: 8,982,000) is in England, United Kingdom, and Barcelona (population: 1,620,343) is in Catalonia, Spain.
Flying from London to Rome takes approximately 2h 18min, while London to Barcelona takes 1h 55min.
Since both routes depart from London, this comparison is especially useful for travelers deciding between Rome and Barcelona as a destination.
The 295 km difference between these routes is noticeable in both travel time and fuel or ticket costs.
Neither route has a road figure we can defend. Yes — you can drive from London to Rome 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 Barcelona 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.
Rome (Italy) has a population of 2,873,000 and is located in the Lazio region of Europe. It's a significant city with good transport links and cultural offerings.
Barcelona (Spain) has a population of 1,620,343 and is situated in Catalonia, Europe. This city serves as an important regional hub with solid connectivity.
Choose this route if your priority is reaching Rome (Italy) — a city of 2,873,000 in the Lazio region of Europe. Despite being the longer of the two at 1,434 km, it makes sense when Rome 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 1,434 km. The initial bearing is 133° (SE), so a great-circle flight leaves London heading roughly SE.
This route is the right call if you are heading to Barcelona (Spain) — a city of 1,620,343 in the Catalonia region of Europe. It is also the shorter of the two at 1,139 km, saving about 23 min of flying and around 76 kg of CO₂ per passenger. Overland travel is not practical for 1,139 km; flying is the realistic mode. Departing London, the great-circle bearing toward Barcelona is 170° (S).
London (51.51°, -0.13°) → Rome (41.90°, 12.50°): London keeps Europe/London time and Rome keeps Europe/Rome time — a gap of about 1 hour, with Rome 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°) → Barcelona (41.39°, 2.17°): London keeps Europe/London time and Barcelona keeps Europe/Madrid time — a gap of about 1 hour, with Barcelona 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.
Barcelona is closer at 1,139 km, which is 295 km (21%) shorter.
1,434 km (891 miles). Flight: ~2h 18min.
1,139 km (708 miles). Flight: ~1h 55min.
Flying to Barcelona is faster at ~1h 55min, saving about 23 min compared to Rome.
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.