Route · ORD → LHR
Flights from Chicago to London
Chicago O'Hare to London Heathrow is one of the busiest transatlantic corridors in the world, covering roughly 6,344 km great-circle with a typical westbound block time around 7h 48m and a somewhat shorter eastbound leg aided by prevailing tailwinds. American Airlines and United Airlines dominate the route with daily widebody service — typically Boeing 777s and 787s — while Iberia operates it as a codeshare extension of its Madrid hub and Lufthansa tags it through Frankfurt connections, giving travelers meaningful alliance options across both oneworld and Star Alliance. A practical note worth knowing: American operates from Heathrow Terminal 3 while United uses Terminal 2, so if you're connecting onward or meeting someone, confirming the terminal in advance saves real confusion. On fares, shoulder season — broadly late January through March and again in October — tends to offer the most competitive economy pricing, while premium-cabin award availability on American and United often opens up midweek departures well outside peak summer travel.
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Cheapest dates to fly
Live prices · powered by AviasalesThe calendar below pulls live fares from our search partner for Chicago (ORD) → London (LHR). Use the year view… to spot the cheapest week to fly, the day-of-week patterns most travellers miss, and any shoulder-season dips worth shifting your trip around. Prices refresh every few hours, so what you see is what your booking page should look like a moment later — click any date to jump straight to the fare on Aviasales.
Airlines on this route
4 carriersThe 4 carriers we currently track on the Chicago–London route, from full-service flag carriers to low-cost competitors. Tap any airline for its full profile, baggage… rules, fleet context, and a live fare search pre-filtered to that carrier — useful if you're loyal to a frequent-flyer programme, want to compare onboard product on the same dates, or are weighing a cheaper one-stop against a pricier nonstop.
Flights from Chicago to London
Live schedule · powered by AviasalesBelow is the published weekly schedule for nonstop and one-stop services from Chicago to London — the actual flight numbers, departure and arrival times your… booking page will pull from. Use it to plan around departure preferences (early morning vs late evening), see which carriers fly on which weekdays, or pick a connection that lets you sleep in your own bed before a long-haul leg. Click any row to load it directly in the search.
Airport guides
Quick links into the airport profiles at both ends of the route. Each guide covers terminal layout, the airlines that base hubs at ORD and… LHR, the other routes those airports serve, and the ground-transit options most travellers wish they'd read about before landing — the practical context you only really need to know once you've booked, but want to skim before you do.