How to find the cheapest flight from
Illinois to Heathrow (LHR)
How far in advance should I book a flight from Illinois to Heathrow?
To save up to 38% on this flight, we recommend booking at least 51 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Illinois to Heathrow from $813 1-2 weeks out and tickets from $886 for flights departing within the next 72 hours.
What is the cheapest month to fly from Illinois to Heathrow?
February can be a great time to fly to Heathrow from Illinois with a flight ticket averaging about $634. Cheapflights users have found deals in the month of February for as cheap as $394. The most expensive prices can be found in the month of June.
One-way flights to Heathrow from Illinois
The cheapest one-way flights from Illinois to Heathrow
12:38 pm - 1:45 pm
3:45 pm - 1:45 pm
7:10 am - 8:45 am
Related info for your journey
Useful info, stats and facts about Illinois to Heathrow flights.
Arrival points for flights from Illinois to Heathrow
Destination information for Heathrow
Things to know before you go. Useful info for your trip from Illinois to Heathrow