£159 Find Cheap Flights from Illinois to the United Kingdom

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.

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 £332.

Based on KAYAK data, the cheapest day to fly to the United Kingdom is Wednesday when return tickets can be as cheap as £533. On the other hand, the most expensive day to fly is Sunday, when return prices are £665 on average.

The cheapest time of day to fly to the United Kingdom is generally in the evening, when round-trip flights cost £798 on average. On average, there is no price difference when choosing to fly in the morning or the evening on this flight route. The most expensive time of day to fly to the United Kingdom is generally in the afternoon, which is peak travel time and where the average cost of a ticket is £933.

The cheapest ticket to the United Kingdom from Illinois found in the last 72 hours was to London Heathrow Airport, at £592 return. The most popular route is Chicago O'Hare Intl Airport (ORD) to London Heathrow Airport (LHR) and the cheapest return airline ticket found on this route in the last 72 hours was £592.

The cheapest month for flights from Illinois to the United Kingdom is January, when tickets cost £418 (return) on average. On the other hand, the most expensive months are June and July, when the average cost of round-trip tickets is £758 and £680 respectively.

To get a below-average price on the flight from Illinois to the United Kingdom, you should book around 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 3 weeks before departure.

An average direct flight from Illinois to the United Kingdom takes 13h 17m, covering a distance of 3889 miles. The shortest route is Chicago O'Hare Intl Airport (ORD) to London Heathrow Airport (LHR) with an average flight time of 7h 35m.

Based on KAYAK flight searches, the most popular destination is London (81% of total searches to the United Kingdom). The next most popular destinations are Edinburgh (8%) and Belfast (5%). Searches for flights to Manchester (2%), to Birmingham (1%), and to Southampton (1%) are also popular.