Cheap flights from London to Illinois from £210
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Illinois departing on 13/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names, great deals
Big names, great deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customise your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from London to Illinois
Cheap return flights
Cheap one-way flights
Cheap last-minute flights
Cheap direct flights
Icelandair flights from London to Illinois
Our best Icelandair deals on London to Illinois flight tickets
KLM flights from London to Illinois
Our best KLM deals on London to Illinois flight tickets
See travel insights to Illinois from
How to get the cheapest flight ticket from London to Illinois
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Illinois?
The month of February is, on average, the cheapest month to fly to Illinois from London, with most prices found around £434. If you aren’t able to travel to Illinois during the month of February, then flying in March is also cheap. Prices for this month can be found on momondo for an average of £462.
What is the cheapest day to depart on your flight to Illinois?
The cheapest day to depart on your flight to Illinois is on a Wednesday when prices can be found for as low as £615. This is often the case because there is less demand to fly during this day of the week. Flights from London to Illinois on a Sunday will generally be more expensive and average around £669. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.
What is the cheapest time of day to depart on your flight to Illinois?
Our data shows that the cheapest London to Illinois flights are usually those with departure times in the evening. Our users have found flights to Illinois in the evening for as low as £559. In the afternoon is when there is more demand to fly to Illinois, so prices are often more expensive at around £654 per ticket.
What is the cheapest London to Illinois flight route?
Fly from London Heathrow to Chicago O'Hare Intl for the best London - Illinois flight prices
How far in advance should I book a flight to Illinois?
You are more likely to see cheaper flights to Illinois from London when booking 13 weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around £554 when searching 13 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from London for as low as £531 on momondo.
What cabin class options are available on London to Illinois flights?
There are 4 cabin classes available to choose from on London to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
How many flights depart from London to Illinois on average per day?
The number of flights available between London and Illinois is 48 per day as of May 2025. The most frequent departure time is 14:00, with 54% of daily flights leaving in the afternoon.
How many flights depart from London to Illinois on average per week?
The number of flights available between London and Illinois is 341 per week as of May 2025. The most frequent departure day is Wed, with 16% of weekly flights leaving on this day.
Cheap London to Illinois flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from London to Illinois
When did momondo last update prices for flights from London to Illinois?
Prices for flights from London to Illinois are refreshed on a daily basis.
How many operators does momondo search for flights from London to Illinois?
As of May 2025, there are 15 operators available to choose from for flights from London to Illinois.
How old do you have to be to fly from London to Illinois?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Illinois.
What documentation or ID do you need to fly to Illinois?
The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from London to Illinois?
momondo data reveals that the most frequently booked plane model on the route from London to Illinois is Boeing 767-300, representing 33.60% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 21.60%, Boeing 777 at 17.59%, and Boeing 777-300ER at 7.21%.
Best airlines flying from London to Illinois
Compare and see reviews for airlines that fly from London to Illinois with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom £314 | Free Cancellation | Rating 7.0 487 reviews | |||
| PriceFrom £356 | Free Cancellation | Rating 7.3 1,349 reviews | |||
| PriceFrom £369 | Free Cancellation | Rating 7.1 1,851 reviews | |||
| PriceFrom £405 | Free Cancellation | Rating 6.6 6,844 reviews | |||
| PriceFrom £409 | Free Cancellation | Rating 7.5 780 reviews | |||
| PriceFrom £410 | Free Cancellation | Rating 7.4 8,696 reviews | |||
| PriceFrom £415 | Free Cancellation | Rating 7.4 642 reviews | |||
| PriceFrom £416 | Free Cancellation | Rating 6.7 7,046 reviews | |||
| PriceFrom £423 | Free Cancellation | Rating 7.3 346 reviews | |||
| PriceFrom £429 | Free Cancellation | Rating 7.0 1,076 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from London to Illinois?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Illinois for you.
Can I find flights from London to Illinois with flexible booking policies on momondo?
All flight searches from London to Illinois on momondo can be filtered to show those which offer flexible booking policies.
How can momondo help me find flights from London to Illinois?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from London.
I’m not ready to book a flight from London to Illinois right now. Can momondo alert me if prices change?
Yes. momondo can track prices for London to Illinois flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.