£166 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 travellers 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 return 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 American Airlines (43 flights per week), British Airways (42 flights per week), and Finnair (40 flights per week).

There are 40 airports in the United Kingdom. The busiest airport is London Heathrow Airport (LHR), with 45% 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 £506.

Based on KAYAK data, the cheapest day to fly to the United Kingdom is Monday when return tickets can be as cheap as £665. On the other hand, the most expensive day to fly is Saturday, when return prices are £1,025 on average.

The cheapest time of day to fly to the United Kingdom is generally at night, when retur flights cost £817 on average. Morning departures are around 100% cheaper than evening flights, on average. The most expensive time of day to fly to the United Kingdom is generally in the evening, which is peak travel time and where the average cost of a ticket is £871.

The cheapest ticket to the United Kingdom from Illinois found in the last 5 days was to London Heathrow Airport, at £676 return. The most popular route is Chicago O'Hare Intl Airport (ORD) to London Heathrow Airport (LHR) and the cheapest return ticket found on this route in the last 5 days was £676.

The cheapest month for flights from Illinois to the United Kingdom is February, when tickets cost £298 (return) on average. On the other hand, the most expensive months are June and May, when the average cost of round-trip tickets is £502 and £451 respectively.

To get a below-average price on the flight from Illinois to the United Kingdom, you should book around 1 week before departure. 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 one city. This city is Chicago and there are 400 direct flights each week.

There are around 58 direct flights from within Illinois to the United Kingdom every day. Most flights (53%) depart in the evening.

Each week there are around 400 direct flights from within Illinois to the United Kingdom. The most common day for departures is Monday, with 15% of flights taking off on this day.

An average direct flight from Illinois to the United Kingdom takes 13h 12m, covering a distance of 3912 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 aren’t 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 400 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 (88% of total searches to the United Kingdom). The next most popular destinations are Edinburgh (5%) and Manchester (3%). Searches for flights to Birmingham (1%), to Belfast (0%), and to Bristol (0%) are also popular.