What are the cheapest airlines to fly from Sheffield to Illinois one-way?

One-way options have recently been found by users for as low as £478 on Aer Lingus. Other airlines that offer cheap prices include Icelandair from £701 and Air France from £851 one-way.

What are the most popular routes from Sheffield to Illinois?

The most popular route from Sheffield to Illinois is Manchester - Chicago O'Hare Intl. You may also consider Manchester - Chicago Midway or Manchester - Lambert-St Louis.

What are the most popular airlines that fly from Sheffield to Illinois?

Before booking your flight from Sheffield to Illinois check out the most popular airlines for this route: Finnair, British Airways or Aer Lingus.

How far in advance should I book a flight from Sheffield to Illinois?

To save on the cost of your flight from Sheffield to Illinois, book at least 41 days before your planned departure. Booking around this time can save you about 22% on the cost of this flight compared to booking a flight leaving this week. We have found prices from £501 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as £770.

What is the cheapest month to fly from Sheffield to Illinois?

The best pricing can be found in the month of February. Prices to Illinois from Sheffield average £575. You can even find prices in February for less than £575, as users have found deals to Illinois from as low as £387. The month of July appears to be one of the more expensive times to travel to Illinois from Sheffield. Flying in the targeted month can save you up to 20%.

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

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

How can I find direct flights from Sheffield to Illinois?

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

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

Yes. Cheapflights offers flight deals from Sheffield 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.

£261+ Flights from Sheffield to Illinois

Cheap flight deals from Sheffield to Illinois

Round-trip from	£490
One-way from	£382
Popular in	July
Cheapest in	February
Average price	£518

15/5-29/5
2 total stops
25h 35m total
Sheffield to Illinois

Search Deals

29/7
2 total stops
42h 45m total
Sheffield to Illinois

Search Deals

Highest demand for flights based on searches. 13% potential increase in price (£67 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (£9 potential savings vs. average return price).

Search Deals

Average for round-trip flights in March 2025

Search Deals

Find flight deals from Sheffield to Illinois

Cheapest flights from Sheffield to Illinois
Explore the most affordable flight options available from Sheffield to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 March 2025.

Mon 3/1110:10MAN - ORD

1 stop12h 35mScandinavian Airlines

Sun 16/1119:30ORD - MAN

1 stop17h 00mScandinavian Airlines

Deal found 30/3£484

Thu 15/510:50MAN - ORD

1 stop14h 10mMultiple Airlines

Thu 29/515:45ORD - MAN

1 stop11h 25mMultiple Airlines

Deal found 31/3£490

Fri 12/910:30MAN - ORD

1 stop12h 30mBritish Airways

Fri 19/921:15ORD - MAN

1 stop12h 35mBritish Airways

Deal found 29/3£491

Fri 18/420:40MAN - ORD

1 stop23h 30mVirgin Atlantic

Fri 2/516:20ORD - MAN

1 stop14h 50mVirgin Atlantic

Deal found 31/3£504

Tue 29/407:00MAN - ORD

2 stops16h 39mFinnair

Tue 6/520:30ORD - MAN

1 stop10h 40mFinnair

Deal found 30/3£508

Wed 23/406:05MAN - ORD

2 stops14h 50mAir Canada

Wed 30/411:30ORD - MAN

2 stops16h 55mAir Canada

Deal found 30/3£511

Sun 20/406:05MAN - ORD

2 stops31h 57mUnited Airlines

Sun 27/414:55ORD - MAN

1 stop11h 30mUnited Airlines

Deal found 31/3£513

Fri 18/416:55MAN - ORD

1 stop24h 50mAmerican Airlines

Fri 2/522:20ORD - MAN

1 stop13h 00mAmerican Airlines

Deal found 31/3£520

Fri 12/912:35MAN - MDW

1 stop15h 09mVirgin Atlantic

Fri 19/915:40MDW - MAN

1 stop10h 55mVirgin Atlantic

Deal found 29/3£525

Wed 3/1211:55MAN - ORD

1 stop11h 25mIcelandair

Tue 9/1218:30ORD - MAN

1 stop10h 15mIcelandair

Deal found 30/3£527

Wed 7/519:15MAN - ORD

1 stop25h 00mIberia

Sun 18/522:25ORD - MAN

1 stop14h 25mIberia

Deal found 30/3£528

Wed 30/411:55MAN - MDW

1 stop16h 27mDelta

Wed 7/518:25MDW - MAN

2 stops13h 00mDelta

Deal found 31/3£538

Best flights from Sheffield to Illinois
Discover carefully curated flight deals from Sheffield to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 31 March 2025.

Thu 15/510:50MAN - ORD

1 stop14h 10mMultiple Airlines

Thu 29/515:45ORD - MAN

1 stop11h 25mMultiple Airlines

Deal found 31/3£490

Fri 12/910:30MAN - ORD

1 stop12h 30mBritish Airways

Fri 19/921:15ORD - MAN

1 stop12h 35mBritish Airways

Deal found 29/3£491

Thu 22/519:10MAN - ORD

1 stop27h 00mScandinavian Airlines

Thu 29/519:15ORD - MAN

1 stop32h 05mScandinavian Airlines

Deal found 31/3£505

Fri 18/420:40MAN - ORD

1 stop23h 30mVirgin Atlantic

Fri 2/516:20ORD - MAN

1 stop12h 00mVirgin Atlantic

Deal found 31/3£508

Tue 29/407:00MAN - ORD

2 stops16h 39mFinnair

Tue 6/520:30ORD - MAN

1 stop10h 40mFinnair

Deal found 30/3£508

Wed 23/406:05MAN - ORD

2 stops14h 50mAir Canada

Wed 30/411:30ORD - MAN

2 stops16h 55mAir Canada

Deal found 30/3£511

Sun 20/406:05MAN - ORD

2 stops31h 57mUnited Airlines

Sun 27/414:55ORD - MAN

1 stop11h 30mUnited Airlines

Deal found 31/3£513

Fri 18/416:55MAN - ORD

1 stop24h 50mAmerican Airlines

Fri 2/522:20ORD - MAN

1 stop13h 00mAmerican Airlines

Deal found 31/3£520

Wed 7/519:15MAN - ORD

1 stop25h 00mIberia

Sun 18/522:25ORD - MAN

1 stop14h 25mIberia

Deal found 30/3£528

Wed 30/411:55MAN - MDW

1 stop16h 27mDelta

Wed 7/518:25MDW - MAN

2 stops13h 00mDelta

Deal found 31/3£538

Sat 19/408:10MAN - ORD

1 stop11h 50mAer Lingus

Sat 26/415:45ORD - MAN

1 stop9h 50mAer Lingus

Deal found 29/3£550

Mon 21/413:05MAN - ORD

1 stop11h 10mIcelandair

Fri 25/422:15ORD - MAN

1 stop31h 25mIcelandair

Deal found 30/3£562

Last-minute flights from Sheffield to Illinois
Discover last-minute flight deals from Sheffield to Illinois. Data last updated 31 March 2025 and is based on user searches.

Sat 5/414:20MAN - ORD

1 stop10h 40mAer Lingus

Sat 12/415:45ORD - MAN

1 stop9h 50mAer Lingus

Deal found 29/3£813

Sun 6/422:30MAN - ORD

1 stop26h 30mMultiple Airlines

Sun 13/416:55ORD - MAN

2 stops22h 45mMultiple Airlines

Deal found 31/3£641

Sun 6/407:50MAN - ORD

1 stop16h 25mBritish Airways

Sun 13/419:15ORD - MAN

1 stop14h 50mBritish Airways

Deal found 31/3£795

Fri 18/420:40MAN - ORD

1 stop23h 30mVirgin Atlantic

Fri 2/516:20ORD - MAN

1 stop14h 50mVirgin Atlantic

Deal found 31/3£504

Fri 18/416:55MAN - ORD

1 stop24h 50mAmerican Airlines

Fri 2/522:20ORD - MAN

1 stop13h 00mAmerican Airlines

Deal found 31/3£520

Sat 19/407:50MAN - ORD

1 stop12h 55mBritish Airways

Sun 27/421:15ORD - MAN

1 stop12h 50mBritish Airways

Deal found 31/3£492

Sat 19/409:00MAN - ORD

2 stops18h 31mDelta

Sun 27/410:30ORD - MAN

2 stops15h 50mDelta

Deal found 31/3£542

Sat 19/408:10MAN - ORD

1 stop11h 50mAer Lingus

Sat 26/415:45ORD - MAN

1 stop9h 50mAer Lingus

Deal found 29/3£550

Sun 20/406:05MAN - ORD

2 stops31h 57mUnited Airlines

Sun 27/414:55ORD - MAN

1 stop11h 30mUnited Airlines

Deal found 31/3£513

Mon 21/413:05MAN - ORD

1 stop11h 10mIcelandair

Fri 25/422:15ORD - MAN

1 stop31h 25mIcelandair

Deal found 30/3£562

Wed 23/416:05MAN - ORD

1 stop27h 50mMultiple Airlines

Wed 30/420:20ORD - MAN

1 stop19h 30mMultiple Airlines

Deal found 31/3£494

Wed 23/406:05MAN - ORD

2 stops14h 50mAir Canada

Wed 30/411:30ORD - MAN

2 stops16h 55mAir Canada

Deal found 30/3£511

One-way flights from Sheffield to Illinois
Search for one-way flight options from Sheffield to Illinois. Find affordable one-way fares based on user searches. Data last updated 31 March 2025.

Tue 29/720:55MAN - ORD

2 stops42h 45mMultiple Airlines

Deal found 30/3£382

Sat 27/914:20MAN - ORD

1 stop10h 40mAer Lingus

Deal found 30/3£478

Fri 27/613:05MAN - ORD

1 stop11h 10mIcelandair

Deal found 30/3£701

Sat 14/612:35MAN - MDW

1 stop15h 03mAir France

Deal found 30/3£851

Sat 14/610:55MAN - ORD

3 stops26h 43mTAP AIR PORTUGAL

Deal found 31/3£1,081

Sat 14/612:35MAN - MDW

1 stop15h 03mVirgin Atlantic

Deal found 31/3£1,365

Sat 14/605:55MAN - MDW

2 stops18h 50mDelta

Deal found 31/3£1,441

Tue 29/709:10MAN - ORD

3 stops20h 27mUnited Airlines

Deal found 30/3£1,710

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

ManchesterChicago

MAN - ORD

MANORD

Manchester

Thu 15/5

10:50-19:00

1 stop14h 10m

Chicago O'Hare Intl

Thu 29/5

15:45-09:10

1 stop11h 25m

£490

ManchesterChicago

MAN - ORD

MANORD

Manchester

Fri 12/9

10:30-17:00

1 stop12h 30m

Chicago O'Hare Intl

Fri 19/9

21:15-15:50

1 stop12h 35m

£491

ManchesterChicago

MAN - ORD

MANORD

Manchester

Fri 18/4

20:40-14:10

1 stop23h 30m

Chicago O'Hare Intl

Fri 2/5

16:20-13:10

1 stop14h 50m

£504

ManchesterChicago

MAN - ORD

MANORD

Manchester

Thu 22/5

19:10-16:10

1 stop27h 00m

Chicago O'Hare Intl

Thu 29/5

19:15-09:20

1 stop32h 05m

£505

ManchesterChicago

MAN - ORD

MANORD

Manchester

Tue 29/4

07:00-17:39

2 stops16h 39m

Chicago O'Hare Intl

Tue 6/5

20:30-13:10

1 stop10h 40m

£508

ManchesterChicago

MAN - ORD

MANORD

Manchester

Wed 23/4

06:05-14:55

2 stops14h 50m

Chicago O'Hare Intl

Wed 30/4

11:30-10:25

2 stops16h 55m

£511

ManchesterChicago

MAN - ORD

MANORD

Manchester

Sun 20/4

06:05-08:02

2 stops31h 57m

Chicago O'Hare Intl

Sun 27/4

14:55-08:25

1 stop11h 30m

£513

ManchesterChicago

MAN - ORD

MANORD

Manchester

Fri 18/4

16:55-11:45

1 stop24h 50m

Chicago O'Hare Intl

Fri 2/5

22:20-17:20

1 stop13h 00m

£520

ManchesterChicago

MAN - MDW

MANMDW

Manchester

Fri 12/9

12:35-21:44

1 stop15h 09m

Chicago Midway

Fri 19/9

15:40-08:35

1 stop10h 55m

£525

ManchesterChicago

MAN - ORD

MANORD

Manchester

Wed 7/5

19:15-14:15

1 stop25h 00m

Chicago O'Hare Intl

Sun 18/5

22:25-18:50

1 stop14h 25m

£528

Flights are sorted by cheapest return flights first.

Deals found on 31/3

Showing 1-10 of 40 results

Best time to book a flight from Sheffield to Illinois

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

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 Sheffield to Illinois

What is the cheapest month to book a flight from Sheffield to Illinois?

Currently, January is the cheapest month in which you can book a flight from Sheffield to Illinois (average of £595). Flying from Sheffield to Illinois in July is currently the most expensive (average of £843). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SH9 to IL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Sheffield to Illinois as you normally would.

Rainfall in Illinois by month

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.

Temperature in Illinois by month

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).

Reviews of airlines servicing Illinois

Read through reviews of airlines operating flights from Sheffield to Illinois, such as Delta, KLM and Finnair. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,899 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta

8.0

Very Good

7,899 reviews

Delta

8.0

Very Good

7,899 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM

7.8

Good

1,321 reviews

Delta

8.0

Very Good

7,899 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Finnair

7.6

Good

1,267 reviews

Delta

8.0

Very Good

7,899 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Austrian Airlines

7.6

Good

770 reviews

Delta

8.0

Very Good

7,899 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

SWISS

7.5

Good

1,570 reviews

Delta

8.0

Very Good

7,899 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

What are the cheapest airlines to fly from Sheffield to Illinois one-way?
One-way options have recently been found by users for as low as £478 on Aer Lingus. Other airlines that offer cheap prices include Icelandair from £701 and Air France from £851 one-way.
What are the most popular routes from Sheffield to Illinois?
The most popular route from Sheffield to Illinois is Manchester - Chicago O'Hare Intl. You may also consider Manchester - Chicago Midway or Manchester - Lambert-St Louis.
Can I find deals for flights from Sheffield to Illinois that include hotel bookings?
Yes. In addition to deals on Sheffield to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Sheffield to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sheffield to Illinois.
Can I find deals for business class flights from Sheffield to Illinois?
Yes. Cheapflights offers flight deals from Sheffield 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.
What is the cheapest month to book a flight from Sheffield to Illinois?
Currently, January is the cheapest month in which you can book a flight from Sheffield to Illinois (average of £595). Flying from Sheffield to Illinois in July is currently the most expensive (average of £843). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Sheffield to Illinois

Heathrow to John F Kennedy Intl flights

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Stansted to Newark flights

Heathrow to Baltimore flights

Heathrow to Hobby flights

London City to Los Angeles flights

Gatwick to Boston flights

London City to Miami flights

Gatwick to Miami flights

Gatwick to Los Angeles flights

Heathrow to George Bush Intcntl flights

London City to Orlando flights

Gatwick to Stewart flights

Manchester to Newark flights

London City to Boston flights

Heathrow to Nashville flights

Manchester to LaGuardia flights

Luton to Newark flights

Heathrow to Denver flights

Heathrow to Raleigh flights

Heathrow to Tampa flights

Gatwick to San Francisco flights

London City to San Francisco flights

Luton to Stewart flights

Stansted to Boston flights

Heathrow to San Diego flights

Heathrow to Charlotte flights

Complete your trip

Illinois car hire

Chicago O'Hare Intl Airport car hire

Chicago Midway Airport car hire

Moline Quad-City Airport car hire

Greater Peoria Airport car hire

Bloomington-Normal Airport car hire

Springfield Capital Airport car hire

Chicago Greater Rockford Airport car hire

Champaign University-Willard Airport car hire

Belleville Airport car hire

Marion Williamson County Airport car hire

Quincy Regional Airport car hire

Direct flights to United States

Top 8 airlines flying from Sheffield to Illinois

Airline	Cheapest	Average	Flexibility	On-time
Scandinavian Airlines	Cheapest£372	Average£497	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
Icelandair	Cheapest£383	Average£539	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Aer Lingus	Cheapest£428	Average£624	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
British Airways	Cheapest£450	Average£998	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
KLM	Cheapest£480	Average£606	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Virgin Atlantic	Cheapest£499	Average£642	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Finnair	Cheapest£506	Average£636	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Lufthansa	Cheapest£539	Average£662	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights

Fly with Cheapflights

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

Cheapflights makes it easy to find Sheffield to Illinois flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

Cheapflights simply makes it quick and affordable to book flights from Sheffield 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 Sheffield to Illinois with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Sheffield to Illinois flexibly with Cheapflights today.

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

Not ready to book yet? You can track prices for flights from Sheffield to Illinois on Cheapflights with our Price Alert feature and get notified when better prices are available.

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Cheap flights from Sheffield to Illinois from £261

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 29/5. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Sheffield to Illinois

Keep the following information in mind while searching for Sheffield to Illinois flight deals. Data was last updated 31 March 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Sheffield to Illinois

Cheapest flights from Sheffield to IllinoisExplore the most affordable flight options available from Sheffield to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 March 2025.

Explore the most affordable flight options available from Sheffield to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 March 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Sheffield to Illinois

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

Cheapflights Insights

Everything you need to know about your flight from Sheffield to Illinois

What is the cheapest month to book a flight from Sheffield to Illinois?

What is the cheapest time of day to fly from SH9 to IL?

Find hourly flight availability from Sheffield to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 31 March 2025.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

Reviews of airlines servicing Illinois

Read through reviews of airlines operating flights from Sheffield to Illinois, such as Delta, KLM and Finnair. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Sheffield to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines to fly from Sheffield to Illinois one-way?

What are the most popular routes from Sheffield to Illinois?

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

How can I find direct flights from Sheffield to Illinois?

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

What is the cheapest month to book a flight from Sheffield 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 Sheffield to Illinois

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

Top 8 airlines flying from Sheffield to Illinois

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

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

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

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

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Cheapest flights from Sheffield to Illinois
Explore the most affordable flight options available from Sheffield to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 March 2025.