Best time to book Chicago to London
January and February typically offer the lowest fares. Summer months and December see peak pricing due to high demand. Book 4–6 weeks in advance for the best prices.
US to UK · 3,950 miles
Chicago to London Flights — ORD to LHR Airlines, Airports & Fare Tips
Searching for cheap flights from Chicago to London? Compare O'Hare departures to Heathrow. Find the best time to book, top airlines, flight duration, and money-saving tips for your US to UK trip.
Departure airports in Chicago
ORD
O'Hare International
Major US hub with extensive domestic and international connections. Excellent rail links to downtown Chicago.
Airport guide →Arrival airports in London
LHR
Heathrow
London main hub, excellent connections to UK and Europe. Heathrow Express train to Paddington in 15 minutes.
Airport guide →Airlines flying Chicago to London
American Airlines, British Airways, and United operate frequent flights on this busy transatlantic route. British Airways offers the most nonstop options from Chicago O'Hare.
Flight duration & logistics
Nonstop flights take approximately 7 hours 30 to 40 minutes. The transatlantic flight time makes this route ideal for business or leisure travel. British Airways and American operate multiple daily departures.
Money-saving tips
💰
Book in advance
Reserve 4–6 weeks ahead for better fares. Last-minute bookings may still be available due to high flight frequency.
🔄
Compare airlines
British Airways offers most direct flights. American and United also compete on this route.
📅
Flexible dates
Use flexible date search to find cheaper departure days. Mid-week flights often cost less than weekends.
London skyline
Big Ben and Thames River — arrival city for flights from Chicago
Why book Chicago to London flights with Tikitikita
- Compare American Airlines, British Airways, and United fares in real-time
- See flexible date pricing at a glance
- Find the best departure times for your schedule
- Get transparent pricing with no hidden fees
Frequently asked questions
How long is a flight from Chicago to London?
A nonstop flight from Chicago to London takes approximately 7 hours 30 to 40 minutes. The distance between the cities is 3,950 miles (6,355 km).
What is the cheapest month to fly from Chicago to London?
January and February often offer the lowest fares. Summer months and December see peak pricing due to high demand.
Which airlines fly from Chicago to London?
American Airlines, British Airways, and United operate frequent flights on this route. British Airways offers the most nonstop options.
Should I book a nonstop or connecting flight from Chicago to London?
Nonstop is fastest at just over 7 hours. Connecting flights may be cheaper but add 4–8 hours to total travel time.
What is the best time to book Chicago to London flights?
Book 4–6 weeks in advance for the best fares. Last-minute bookings may still be available due to high flight frequency.