London · April · warmth

Warmest places to go from London in April

The warmest place you can reach from London in April within 15 hours is Kom Ombo at 28.3 °C, costing 962 kg CO₂e return. The lowest-carbon option is Calais at 4.5 kg — 214× less carbon for 18.7 °C less.

Every destination here is on the efficiency frontier: nowhere else in Europe is both warmer in April and lower in carbon. Anything a better option beats outright has been left out.

Where they are. Solid lines are rail or ferry, dashed are flights, from London. Pick one to compare.

By rail or ferry By air

Carbon against warmth, April, departing London. Journeys of up to 15 hours each way.

What the 15-hour limit costs: at this budget Andujar can only be reached by air — 385 kg CO₂e, in 5h 30m. Allow up to 24 hours and the train does the same journey for 45.1 kg in 22h 54m — 9× less carbon for 17h 24m more travelling.

April from London — 16 destinations on the frontier, 5 without flying.
Destination	How	CO₂e return	Temp	Sun/day	Rain/day	Journey
Calais, France	Rail	4.5 kg	9.6 °C	9.0 h	2.9 mm	4h 6m
St-Malo, France	Rail	10.2 kg	10.8 °C	9.0 h	2.2 mm	6h 42m
La Rochelle, France	Rail	17.7 kg	12.1 °C	9.8 h	2.6 mm	10h 12m
Bordeaux, France	Rail	21.9 kg	12.9 °C	9.6 h	2.2 mm	12h 12m
Montpellier, France	Rail	27.4 kg	14.1 °C	10.5 h	1.9 mm	14h 42m
Perpignan, France	Air	253 kg	15.2 °C	10.4 h	1.3 mm	4h 48m
Zaragoza, Spain	Air	276 kg	16.1 °C	11.3 h	0.6 mm	5h
Alzira, Spain	Air	346 kg	18.2 °C	11.5 h	0.1 mm	5h 18m
Andujar, Spain	Air	385 kg	18.7 °C	11.9 h	0.4 mm	5h 30m
Seville, Spain	Air	412 kg	19.8 °C	11.8 h	0.2 mm	5h 42m
Tozeur, Tunisia	Air	520 kg	21.3 °C	10.8 h	0.6 mm	6h 18m
Arfoud, Morocco	Air	568 kg	22.8 °C	11.7 h	0.1 mm	6h 30m
Zagora, Morocco	Air	604 kg	24.7 °C	12.1 h	0.0 mm	6h 42m
Sohag, Egypt	Air	901 kg	26.3 °C	11.7 h	0.0 mm	8h 36m
Luxor, Egypt	Air	932 kg	27.4 °C	11.8 h	0.0 mm	8h 48m
Kom Ombo, Egypt	Air	962 kg	28.3 °C	11.8 h	0.0 mm	9h

Warm is not the same as pleasant, which is why sunshine and rainfall are shown alongside temperature. All three are ERA5 monthly means for 2023–2024.

Where the curve breaks

The frontier is gentle until it isn't. Going from Montpellier (27.4 kg, 14.1 °C) to Perpignan (253 kg, 15.2 °C) buys 1.1 °C more warmth for an extra 226 kg — 205 kg of CO₂e per degree. That single step is the most expensive warmth on the whole curve.

The pick of them

CalaisFrance4.5 kg CO₂e return9.6 °C · 9.0 h sun · 4h 6m by railcold but bright MontpellierFrance27.4 kg CO₂e return14.1 °C · 10.5 h sun · 14h 42m by railmild and bright Kom OmboEgypt962 kg CO₂e return28.3 °C · 11.8 h sun · 9h by airwarm, bright and dry

If you'd rather have sunshine than heat

April answers differently depending on what you're after. The sunniest destinations from London in April are a different list — the brightest places are not always the hottest, and in winter the difference is large.

Where to stay in Kom Ombo

Places to stay in Kom Ombo, Egypt, on a live map. Prices and availability come from Stay22 and its booking partners.

Affiliate disclosure. A booking made through this map may earn 0xCarbon a commission, at no extra cost to you. It changes nothing above it: the emissions figures come from UK Government conversion factors and are computed before anyone is paid anything.See the method.

Other months from London

April from elsewhere

Questions

Where is the warmest place to go from London in April?

Kom Ombo, Egypt, at 28.3 °C. Reaching it emits 962 kg CO₂e return, travelling 9h each way by air.

Can I get somewhere warm from London in April without flying?

Yes. Montpellier reaches 14.1 °C and is reachable by rail or ferry in 14h 42m, emitting 27.4 kg CO₂e return — though Kom Ombo is warmer still, if you fly.

How much carbon does a return trip from London to Kom Ombo produce?

962 kg CO₂e for one person, return, by air. That uses the UK Government's 2026 conversion factors, including radiative forcing for flights.

Carbon uses UK Government (DESNZ/DEFRA) 2026 conversion factors applied to great-circle distance, with radiative forcing included for flights. Rail journey times are modelled estimates, not timetabled services. Full method · download the data.