✈️ Cheap flights from Chicago to London

Compare Chicago – London fares from hundreds of airlines and travel sites. The trip is about 6,344 km and takes around 8 h 20 min nonstop.

📏 Distance6,344 km (3,942 miles)

⏱️ Flight timeabout 8 h 20 min nonstop

🕒 Time differenceLondon is 6 hours ahead of Chicago

🛫 AirportsORD, MDW → LHR, LGW, STN, LTN, LCY, SEN

💸 Cheapest monthNov 2026 – from $565

📅 Cheapest months to fly Chicago → London

$695Oct 26
$565Nov 26
$812Jan 27
$810May 27
$817Aug 27

Lowest fares our Fare agent saw for each month. Prices change daily.

🌞 Best time to visit United Kingdom

Best: May-September – the longest, warmest days for hiking, festivals and coastal trips; Scotland's long summer evenings are magical.

Shoulder season: April and October – fewer crowds, spring blossom or autumn colour, and generally mild weather.

Weather by month in London

8°Jan⛅
9°Feb⛅
12°Mar⛅
15°Apr⛅
18°May⛅
22°Jun⛅
24°Jul⛅
23°Aug⛅
20°Sep⛅
16°Oct🌧
11°Nov🌧
9°Dec🌧

Average daytime highs (°C) and how rainy each month is.

📍 Things to do when you land

London's free museums – Wander the British Museum, Natural History Museum and Tate Modern without paying an entry fee.
See a West End show – Catch a musical or play in the theatre district that rivals Broadway.
Stonehenge at sunrise – Watch dawn light strike the great stones on Salisbury Plain, ideally around the solstice.
Edinburgh Castle – Climb the Royal Mile to a fortress perched on a volcanic crag high above Scotland's capital.

United Kingdom travel guide → All flights to United Kingdom →

💡 Tips for a cheaper ticket

🗺️

Planning hackSlow down to save

Staying longer in fewer places cuts transport costs and unlocks weekly discounts on stays.

✈️

Flights hackCarry-on only

Travel with one cabin bag and you skip baggage fees, check-in queues and the risk of lost luggage.

💸

Money hackWithdraw bigger amounts, less often

Most ATMs charge a flat fee, so taking out cash for several days at once is cheaper than many small withdrawals.

Chicago to London flights: questions

How long is the flight from Chicago to London?

A nonstop flight from Chicago to London takes about 8 h 20 min for the 6,344 km (3,942 miles) trip. Flights with a connection take longer – usually 2 to 5 hours more.

How far is London from Chicago?

London is about 6,344 km (3,942 miles) from Chicago as the plane flies.

What is the time difference between Chicago and London?

Right now London is 6 hours ahead of Chicago. Daylight saving changes can shift this by an hour during the year.

What is the cheapest month to fly from Chicago to London?

Recently the lowest fares were in Nov 2026, from about $565. Prices change daily.

Which airports serve Chicago and London?

From Chicago: Chicago O'Hare Intl (ORD), Chicago Midway Intl (MDW). In London: London Heathrow (LHR), London Gatwick (LGW), London Stansted (STN), London Luton (LTN), London City (LCY), London Southend (SEN).

Do I need a visa for United Kingdom?

It depends on your passport – see our United Kingdom visa & entry guide.

Searches open our travel partner in a new tab. We may earn a small commission when you book – it never changes the price you pay, and it keeps this site free.