Find the cheapest direct flight options from Chicago to London over the next three months. Book one-way tickets from CAD 511 and round-trip tickets from CAD 915.

Displayed flight fares from Chicago to London are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Flight Information for Chicago to London Flights

The distance between Chicago and London is 6,354.37km. It takes around 7 hours 55 minutes on average to fly from Chicago to London. Based on Trip.com's data, travel demand peaks in January. The off-season for travel is October.

Cheapest one-way flight priceCAD 212
Cheapest return ticket priceCAD 605
Off-season travel monthOctober
Peak season for travelJanuary
Flight distance6,354.37km
Average flight time7 hours 55 minutes

When is the cheapest time to fly from Chicago to London?

The cheapest time for Chicago to London flights: Jan 25 to Feb 1 — one way flight prices from CAD 212.

Cheapest flights
From price
Search
  • 714
  • 1421
  • 2128
  • Jan

    284
  • 411
  • 1118
  • 1825
  • Feb

    251
  • 18
  • 815
  • 1522
  • Mar

    221
Displayed fare trends are based on Trip.com's aggregated average of the lowest flight prices from Chicago to London, calculated over the upcoming 10 weeks.

Flight FAQs

  • Which airlines offer the cheapest flights from Chicago (CHI) to London (LON)?

    Based on Trip.com data, Frontier Airlines offers one-way fares as low as CAD 212 on Cheapest nonstop routes (e.g. MDW to LGW on Mon, Jan 26), while Scandinavian Airlines offers Cheapest nonstop round-trips from CAD 605 departing on Mon, Jan 19 and returning on Mon, Jan 26.
  • It takes about 7 hours 55 minutes to fly from Chicago (CHI) to London (LON).
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Chicago to London is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from Chicago to London, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Mon, Jan 26, with one-way flights priced at just CAD 212.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is United Airlines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for London travel is around January.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Chicago to London is October, when demand for travel is lower.
  • After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Chicago to London on December 31, 2025 with Icelandair, with prices starting at CAD 781.
  • The time difference between London and Chicago is 6h.
  • Tickets can only be changed or cancelled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.