Cheap flights London to Denver

March is the cheapest month on this route, so if your dates are loose, aim there. The price calendar covers every month from September through August, which shows how much the summer school holidays and the run-up to Christmas push fares up. Weekday departures are usually kinder to your wallet than Friday or Sunday, and the quiet stretch after New Year tends to sit below the spring break rush. Booking a few months ahead helps in summer; in March you can often leave it later.

Nobody in this line-up is a budget carrier — the mix is full-service and regional. United Airlines and Delta Air Lines fly the non-stop from Heathrow to Denver International, with American Airlines and Republic Airways showing up on connecting itineraries. Icelandair, KLM Royal Dutch Airlines, Brussels Airlines, Helvetic Airways, Lufthansa and Lufthansa City Airlines all sell one-stop trips through their European hubs. What is included differs between the non-stop and the one-stop options, so compare baggage rules rather than the headline fare alone.

Denver International is the only airport serving the city, so every flight on this route lands in the same place. It sits well outside town on the plains, which makes the transfer into downtown a proper journey — a rail link and bus services run from the terminal, and taxis or ride shares are faster. Allow extra time on the way home: security queues can be long, and early morning and late afternoon are the busiest windows.

Currency

USD ($)

Power sockets

Type A, B · 120 V

Language

Samoan, Hawaiian, Chamorro, Carolinian, Spanish

Emergency number

911

Driving side

right

Calling code

+1

Internet domain

.us

Population of Denver

716 k (2020)

Altitude

1,609 m · high altitude — take the first day slowly

Time zone

UTC-07 (America/Denver)

Country facts: Wikidata

• Check which London airport your fare leaves from — Heathrow has the non-stop, the others mean a connection.
• Look at what the fare includes, since the short European leg can have tighter hand baggage rules than the long-haul one.
• On two separate tickets, leave a long gap between flights; a missed connection is then yours to fix.
• Sort your passport and ESTA or visa for the USA early, and make sure the passport is valid for the whole trip.
• Compare March with the summer months on the price calendar, and try Tuesday or Wednesday departures.