In terms of precipitation, rainfall in Illinois ranges from 43.0 - 125.0 inches per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Illinois when rainfall is around 43.0 mm.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -5.0 C).

What is the cheapest time of day to fly from SEN to IL?

When flying from London Southend Airport to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Can I find deals for flights from Southend to Illinois that include hotel bookings?

Yes. In addition to deals on Southend to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Southend to Illinois?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Southend to Illinois.

Can I find deals for business class flights from Southend to Illinois?

Yes. Cheapflights offers flight deals from Southend to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£346+ Cheap Flights from London Southend Airport to Illinois

Cheap flight deals from Southend to Illinois

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from Southend to Illinois
Explore the most affordable flight options available from Southend to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2026.

Thu 5/1115:40 -

2 stops28h 20m

Sat 21/1113:55 -

2 stops22h 50m

Deal found 12/9£595

Sat 14/1107:15 -

2 stops17h 05m

Sat 21/1115:55 -

2 stops20h 15m

Deal found 12/9£610

Thu 24/1217:20 -

2 stops28h 10m

Wed 30/1218:30 -

2 stops21h 50m

Deal found 14/9£668

Wed 23/1207:10 -

2 stops16h 10m

Sun 27/1218:30 -

2 stops14h 05m

Deal found 13/9£760

Sun 20/1215:55 -

2 stops30h 50m

Thu 31/1219:15 -

2 stops16h 00m

Deal found 14/9£832

Sun 11/1007:25 -

1 stop13h 45m

Sun 18/1017:10 -

1 stop11h 20m

Deal found 13/9£841

Wed 30/1207:10 -

2 stops16h 10m

Sat 2/110:05 -

2 stops26h 40m

Deal found 15/9£892

Thu 29/1019:00 -

2 stops29h 20m

Thu 5/1118:25 -

1 stop16h 50m

Deal found 14/9£1,006

Sat 19/1207:15 -

1 stop13h 10m

Sun 3/118:25 -

2 stops17h 20m

Deal found 11/9£1,073

Find flight deals from Southend to Illinois

Round-trip from	£595
One-way from	£346
Popular in	August
Cheapest in	February
Average price	£605

5/11-21/11
4 total stops
51h 10m total
London to Illinois

Search Deals

24/11-31/12
3 total stops
37h 55m total
London to Illinois

Search Deals

Highest demand for flights based on searches. 12% potential increase in price (£65 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from London Southend Airport to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonChicago

SEN London Southend - ORD Chicago O'Hare Intl

SENORD

London Southend

Sun 22/11

17:15-18:20

3 stops31h 05m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£362

LondonChicago

SEN London Southend - ORD Chicago O'Hare Intl

SENORD

London Southend

Mon 2/11

07:20-18:20

2 stops41h 00m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£362

LondonChicago

SEN London Southend - ORD Chicago O'Hare Intl

SENORD

London Southend

Fri 11/12

13:30-17:20

3 stops33h 50m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£366

LondonChicago

SEN London Southend - ORD Chicago O'Hare Intl

SENORD

London Southend

Thu 19/11

19:10-17:20

3 stops28h 10m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£369

LondonChicago

SEN London Southend - ORD Chicago O'Hare Intl

SENORD

London Southend

Mon 30/11

12:20-17:20

3 stops35h 00m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£378

LondonChicago

SEN London Southend - ORD Chicago O'Hare Intl

SENORD

London Southend

Tue 24/11

08:00-14:10

2 stops36h 10m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£401

LondonChicago

SEN London Southend - ORD Chicago O'Hare Intl

SENORD

London Southend

Sun 1/11

19:15-14:10

2 stops24h 55m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£404

LondonChicago

SEN London Southend - ORD Chicago O'Hare Intl

SENORD

London Southend

Wed 18/11

17:20-14:55

2 stops27h 35m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£407

LondonChicago

SEN London Southend - ORD Chicago O'Hare Intl

SENORD

London Southend

Tue 6/10

14:40-19:15

3 stops34h 35m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£408

Fastest return journey

LondonChicago

SEN London Southend - ORD Chicago O'Hare Intl

SENORD

London Southend

Wed 14/10

08:25-21:25

2 stops19h 00m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£409

Flights are sorted by cheapest return flights first.

Deals found on 15/9

Showing 1-10 of 16 resultsSorted by cheapest first

Best time to book a flight from Southend to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Southend with our price prediction graph.

SEN-ORD

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London Southend Airport to Illinois

SEN-USIL

SEN-ORD

No data available for this route at this time. Please check back soon.

Related info for your journey

Can I find deals for flights from Southend to Illinois that include hotel bookings?
Yes. In addition to deals on Southend to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Southend to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Southend to Illinois.
Can I find deals for business class flights from Southend to Illinois?
Yes. Cheapflights offers flight deals from Southend to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Southend to Illinois

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How does Cheapflights help users find flights from Southend to Illinois?

Deals for Southend to Illinois flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Southend to Illinois?

Cheapflights simply makes it quick and affordable to book flights from Southend to Illinois by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Southend to Illinois with no change fees?

Need flexible booking options for your flight to Illinois from Southend? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Southend to Illinois become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Illinois from Southend today and book when prices fit your budget.

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Cheap flights from London Southend Airport to Illinois from £346

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 24/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Southend to Illinois

Cheapest flights from Southend to IllinoisExplore the most affordable flight options available from Southend to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2026.

Explore the most affordable flight options available from Southend to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2026.

Best flights from Southend to IllinoisDiscover carefully curated flight deals from Southend to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 September 2026.

Discover carefully curated flight deals from Southend to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 September 2026.

Last-minute flights from Southend to IllinoisDiscover last-minute flight deals from Southend to Illinois. Data last updated 16 September 2026 and is based on user searches.

Discover last-minute flight deals from Southend to Illinois. Data last updated 16 September 2026 and is based on user searches.

One-way flights from Southend to IllinoisSearch for one-way flight options from Southend to Illinois. Find affordable one-way fares based on user searches. Data last updated 16 September 2026.

Search for one-way flight options from Southend to Illinois. Find affordable one-way fares based on user searches. Data last updated 16 September 2026.

Find flight deals from Southend to Illinois

Round-trip from

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Popular in

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Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from London Southend Airport to Illinois that are best for you.

Best time to book a flight from Southend to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Southend with our price prediction graph.

Cheapflights Insights

Related info for your journey

Can I find deals for flights from Southend to Illinois that include hotel bookings?

How can I find direct flights from Southend to Illinois?

Can I find deals for business class flights from Southend to Illinois?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Southend to Illinois

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Illinois by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to United States

Book a non-stop flight to one of these other cities located in United States.

Search flights from Southend to Illinois by cabin class

Find flights from Southend to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Southend and Illinois flights

Browse other Southend and Illinois flight options. Last updated on 16 September 2026.

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How does Cheapflights help users find flights from Southend to Illinois?

Why should you use Cheapflights to find cheap flight tickets from Southend to Illinois?

Can Cheapflights find flights from Southend to Illinois with no change fees?

Can Cheapflights notify me if prices for flights from Southend to Illinois become cheaper?

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Cheapest flights from Southend to Illinois
Explore the most affordable flight options available from Southend to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2026.

Best flights from Southend to Illinois
Discover carefully curated flight deals from Southend to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 September 2026.

Last-minute flights from Southend to Illinois
Discover last-minute flight deals from Southend to Illinois. Data last updated 16 September 2026 and is based on user searches.

One-way flights from Southend to Illinois
Search for one-way flight options from Southend to Illinois. Find affordable one-way fares based on user searches. Data last updated 16 September 2026.