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 · Updated April 7, 2026
1,434 km
891 miles · Flight: ~2h 18min · Drive: ~23h 18min
1,139 km
708 miles · Flight: ~1h 55min · Drive: ~18h 31min
✓ 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 | ~23h 18min | ~18h 31min |
| Road distance (est.) | ~1,864 km | ~1,481 km |
| Drivable? | Yes | Yes |
| Cross-continental | No | No |
| Initial bearing | 133° (SE) | 170° (S) |
| Time-zone shift | +1h | None |
| CO₂ – flight (per pax) | ~366 kg | ~290 kg |
| CO₂ – driving (per car) | ~319 kg | ~253 kg |
| Fuel cost (est.) | ~$186 USD | ~$148 USD |
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. For comparison, driving emits roughly 319 kg and 253 kg per car respectively — meaningful only when the car carries multiple passengers.
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. If driving is an option, expect roughly 23h 18min for the first route and 18h 31min for the second.
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.
Both routes are drivable, with road distances of approximately 1,864 km and 1,481 km respectively. For road trips, the shorter route saves roughly 383 km of driving.
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. Driving is realistic at this distance, with an estimated 1,864 km of road and a fuel cost band around $186 USD. 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. Driving is feasible — expect roughly 1,481 km of road and a fuel cost in the $148 USD range. Departing London, the great-circle bearing toward Barcelona is 170° (S).
London (51.51°, -0.13°) and Rome (41.90°, 12.50°) sit with a time-zone shift of +1 hour. London (51.51°, -0.13°) and Barcelona (41.39°, 2.17°) share an approximate time zone. Both routes have manageable time-zone 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.
📍 Data: Coordinates from OpenStreetMap contributors. Distances calculated using the Haversine formula. Travel times are estimates only. Last verified: April 7, 2026.