$255 Find Cheap Flights from Illinois to the United Kingdom - Compare and Save

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to the United Kingdom.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Illinois to the United Kingdom is likely to change within 7 days, so travelers know whether to wait or book now.

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Illinois to the United Kingdom with an airline and back with another airline.

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Illinois to the United Kingdom up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Illinois and United Kingdom are connected by different airlines. The airlines that fly that route the most regularly are British Airways (74 flights per week), American Airlines (64 flights per week), and Finnair (64 flights per week).

There are 40 airports in the United Kingdom. The busiest airport is London Heathrow Airport (LHR), with 44% of all flights arriving there.

Prices will differ depending on the departure airport, but generally, the cheapest airport to fly to in the United Kingdom is London Heathrow Airport (LHR), with an average flight price of $667.

Based on KAYAK data, the cheapest day to fly to the United Kingdom is Tuesday where round-trip tickets can be as cheap as $894. On the other hand, the most expensive day to fly is Saturday, where round-trip prices are $1,099 on average.

The cheapest time of day to fly to the United Kingdom is generally in the evening, when round-trip flights cost $983 on average. The most expensive time of day to fly to the United Kingdom is generally at night, which is peak travel time and where the average cost of a ticket is $1,015.

The cheapest ticket to the United Kingdom from Illinois found in the last 5 days was to London Heathrow Airport, at $693 round-trip. The most popular route is Chicago O'Hare Intl Airport (ORD) to London Heathrow Airport (LHR) and the cheapest round-trip airline ticket found on this route in the last 5 days was $693.

The cheapest month for flights from Illinois to the United Kingdom is February, when tickets cost $399 (return) on average. On the other hand, the most expensive months are June and May, when the average cost of round-trip tickets is $676 and $604 respectively.

To get a below average price on the flight from Illinois to the United Kingdom, you should book around 2 weeks before departure, which saves you about 3% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

From Illinois, there are direct flights to the United Kingdom from 1 city. This city is Chicago and there are 663 direct flights each week.

There are around 95 direct flights from within Illinois to the United Kingdom every day. Most flights (58%) depart in the evening.

Each week there are around 663 direct flights from within Illinois to the United Kingdom. The most common day for departures is Friday, with 16% of flights taking off on this day.

An average nonstop flight from Illinois to the United Kingdom takes 12h 49m, covering a distance of 3918 miles. The shortest route is Chicago O'Hare Intl Airport (ORD) to London Heathrow Airport (LHR) with an average flight time of 7h 45m.

There are not any medium-haul (3-6 hour flight duration) or short-haul (up to 3 hour flight duration) flights to the United Kingdom. Instead, there are 412 long-haul flights (6-12 hour flight duration), with the most arriving from Chicago.

Based on KAYAK flight searches, the most popular destination is London (96% of total searches to the United Kingdom). The next most popular destinations are Manchester (2%) and Birmingham (1%). Searches for flights to Inverness (0%), to Bristol (0%) and to Cardiff (0%) are also popular.