$299+ Cheap flights from Illinois to Heathrow (LHR)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
Oct 22 — Oct 291
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to Heathrow with Cheapflights
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Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from Illinois to HeathrowExplore the most affordable flight options available from Illinois to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 22, 2026.
Explore the most affordable flight options available from Illinois to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 22, 2026.
This lastminute.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2711:19 am -
2 stops13h 51m
Tue 10/68:55 am -
2 stops19h 35m
Deal found 9/20![Virgin Atlantic logo]()
$706
This Booking.com deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/99:00 pm -
1 stop12h 00m
Wed 10/141:25 pm -
1 stop11h 50m
Deal found 9/21![Aer Lingus logo]()
$723
This Booking.com deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2112:59 pm -
1 stop11h 36m
Wed 10/2811:10 am -
1 stop13h 15m
Deal found 9/21![Multiple Airlines logo]()
$724
This Air Canada deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/187:11 am -
1 stop17h 19m
Wed 10/286:50 am -
2 stops18h 02m
Deal found 9/21![Air Canada logo]()
$725
This Iberia deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/255:10 pm -
Nonstop7h 45m
Wed 12/26:15 am -
1 stop14h 40m
Deal found 9/21![Iberia logo]()
$726
This Delta deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/61:50 pm -
1 stop10h 55m
Wed 10/148:40 am -
1 stop11h 50m
Deal found 9/21![Delta logo]()
$727
This lol.travel deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/45:10 pm -
1 stop11h 40m
Tue 10/138:55 am -
1 stop16h 53m
Deal found 9/21![Finnair logo]()
$727
This KAYAK deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/284:25 pm -
Nonstop8h 20m
Tue 10/208:45 am -
1 stop13h 10m
Deal found 9/21![SWISS logo]()
$728
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/23:45 pm -
Nonstop8h 10m
Fri 11/137:40 am -
Nonstop9h 05m
Deal found 9/21![United Airlines logo]()
$729
This American Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:55 pm -
Nonstop7h 45m
Tue 10/69:45 am -
Nonstop8h 45m
Deal found 9/21![American Airlines logo]()
$730
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/197:30 am -
1 stop18h 15m
Mon 10/264:40 pm -
1 stop31h 45m
Deal found 9/21![United Airlines logo]()
$731
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/56:05 pm -
Nonstop8h 25m
Mon 10/1211:05 am -
1 stop30h 55m
Deal found 9/21![United Airlines logo]()
$732
Best flights from Illinois to HeathrowDiscover carefully curated flight deals from Illinois to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 22, 2026.
Discover carefully curated flight deals from Illinois to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 22, 2026.
This Delta deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/34:19 pm -
1 stop13h 21m
Tue 11/108:40 am -
2 stops15h 24m
Deal found 9/21![Delta logo]()
$736
This Virgin Atlantic deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/211:27 pm -
2 stops13h 48m
Thu 11/58:40 am -
2 stops15h 20m
Deal found 9/21![Virgin Atlantic logo]()
$742
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/210:50 am -
1 stop13h 05m
Fri 12/116:00 pm -
1 stop27h 26m
Deal found 9/17![United Airlines logo]()
$780
This Finnair deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/49:40 pm -
Nonstop8h 00m
Tue 10/138:55 am -
1 stop16h 53m
Deal found 9/20![Finnair logo]()
$796
This KLM deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/136:20 am -
1 stop19h 30m
Wed 11/186:30 am -
2 stops15h 48m
Deal found 9/21![KLM logo]()
$797
This Scandinavian Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/87:15 pm -
1 stop16h 25m
Fri 11/139:05 pm -
2 stops25h 40m
Deal found 9/21![Scandinavian Airlines logo]()
$829
This Justfly.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/172:59 pm -
1 stop15h 36m
Tue 3/237:30 am -
2 stops21h 39m
Deal found 9/17![British Airways logo]()
$896
This Iberia deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/512:13 pm -
1 stop16h 12m
Thu 11/126:15 am -
2 stops18h 03m
Deal found 9/21![Iberia logo]()
$928
This American Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/52:32 pm -
1 stop13h 28m
Thu 11/1211:00 am -
1 stop15h 21m
Deal found 9/21![American Airlines logo]()
$961
This Finnair deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/26:05 am -
1 stop18h 50m
Mon 11/93:40 pm -
1 stop14h 30m
Deal found 9/18![Multiple Airlines logo]()
$962
This Delta deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/211:27 pm -
1 stop11h 43m
Tue 10/2711:20 am -
1 stop11h 40m
Deal found 9/20![Delta logo]()
$744
This Virgin Atlantic deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/275:57 pm -
1 stop11h 23m
Tue 10/136:15 am -
2 stops17h 10m
Deal found 9/17![Virgin Atlantic logo]()
$747
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/110:35 am -
1 stop19h 25m
Wed 3/39:00 am -
2 stops20h 14m
Deal found 9/21![United Airlines logo]()
$796
This Delta deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:06 am -
1 stop18h 19m
Tue 11/1011:30 am -
2 stops17h 01m
Deal found 9/19![Delta logo]()
$747
This Virgin Atlantic deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/46:08 am -
1 stop20h 52m
Wed 11/116:20 am -
2 stops22h 02m
Deal found 9/21![Virgin Atlantic logo]()
$748
This Scandinavian Airlines deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/97:15 pm -
2 stops31h 40m
Sat 11/145:00 pm -
1 stop29h 45m
Deal found 9/18![Scandinavian Airlines logo]()
$861
This United Airlines deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/712:10 pm -
1 stop12h 20m
Mon 10/129:30 am -
1 stop33h 55m
Deal found 9/19![United Airlines logo]()
$797
This Virgin Atlantic deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:06 am -
1 stop19h 44m
Tue 11/1012:40 pm -
1 stop15h 51m
Deal found 9/19![Virgin Atlantic logo]()
$753
This Delta deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/174:00 pm -
1 stop10h 50m
Tue 3/236:20 am -
2 stops21h 03m
Deal found 9/18![Delta logo]()
$758
This Expedia deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/112:13 pm -
2 stops28h 02m
Sun 11/86:10 am -
2 stops18h 08m
Deal found 9/17![Iberia logo]()
$938
This Scandinavian Airlines deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/57:15 pm -
2 stops15h 45m
Tue 2/26:40 am -
2 stops20h 53m
Deal found 9/18![Scandinavian Airlines logo]()
$880
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/314:05 pm -
2 stops23h 55m
Sat 11/146:50 am -
2 stops14h 53m
Deal found 9/17![United Airlines logo]()
$813
This Priceline deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/16:59 pm -
1 stop29h 56m
Sun 11/811:00 am -
1 stop13h 18m
Deal found 9/17![British Airways logo]()
$999
This Virgin Atlantic deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/181:31 pm -
1 stop12h 14m
Sun 11/228:55 am -
2 stops19h 59m
Deal found 9/17![Virgin Atlantic logo]()
$786
This Delta deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/111:35 pm -
1 stop13h 50m
Mon 11/168:40 am -
2 stops16h 04m
Deal found 9/17![Delta logo]()
$788
This United Airlines deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/151:57 pm -
1 stop12h 33m
Mon 12/217:50 am -
Nonstop9h 05m
Deal found 9/18![United Airlines logo]()
$818
This Scandinavian Airlines deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/297:15 pm -
2 stops18h 40m
Wed 10/76:40 am -
2 stops20h 51m
Deal found 9/19![Scandinavian Airlines logo]()
$906
This Iberia deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/1312:13 pm -
1 stop16h 12m
Sun 12/2012:35 pm -
1 stop11h 31m
Deal found 9/19![Iberia logo]()
$1,020
This Delta deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1111:35 am -
1 stop12h 50m
Wed 12/166:30 am -
2 stops18h 15m
Deal found 9/17![Delta logo]()
$788
This Virgin Atlantic deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/211:27 pm -
1 stop11h 43m
Sun 10/258:55 am -
1 stop18h 38m
Deal found 9/21![Virgin Atlantic logo]()
$794
Last-minute flights from Illinois to HeathrowDiscover last-minute flight deals from Illinois to Heathrow. Data last updated September 22, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Heathrow. Data last updated September 22, 2026 and is based on user searches.
This lastminute.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2711:19 am -
2 stops13h 51m
Tue 10/68:55 am -
2 stops19h 35m
Deal found 9/20![Virgin Atlantic logo]()
$706
This KAYAK deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/284:25 pm -
Nonstop8h 20m
Tue 10/208:45 am -
1 stop13h 10m
Deal found 9/21![SWISS logo]()
$728
This American Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:55 pm -
Nonstop7h 45m
Tue 10/69:45 am -
Nonstop8h 45m
Deal found 9/21![American Airlines logo]()
$730
This lol.travel deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/45:10 pm -
1 stop11h 40m
Tue 10/138:55 am -
1 stop16h 53m
Deal found 9/21![Finnair logo]()
$727
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/56:05 pm -
Nonstop8h 25m
Mon 10/1211:05 am -
1 stop30h 55m
Deal found 9/21![United Airlines logo]()
$732
This Delta deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/61:50 pm -
1 stop10h 55m
Wed 10/148:40 am -
1 stop11h 50m
Deal found 9/21![Delta logo]()
$727
This Booking.com deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/99:00 pm -
1 stop12h 00m
Wed 10/141:25 pm -
1 stop11h 50m
Deal found 9/21![Aer Lingus logo]()
$723
This Air Canada deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/187:11 am -
1 stop17h 19m
Wed 10/286:50 am -
2 stops18h 02m
Deal found 9/21![Air Canada logo]()
$725
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/197:30 am -
1 stop18h 15m
Mon 10/264:40 pm -
1 stop31h 45m
Deal found 9/21![United Airlines logo]()
$731
This Gotogate deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/207:11 am -
1 stop20h 49m
Tue 10/276:50 am -
2 stops18h 02m
Deal found 9/21![Air Canada logo]()
$726
This Booking.com deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2112:59 pm -
1 stop11h 36m
Wed 10/2811:10 am -
1 stop13h 15m
Deal found 9/21![Multiple Airlines logo]()
$724
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/214:25 pm -
Nonstop8h 20m
Thu 11/127:40 am -
Nonstop9h 05m
Deal found 9/21![United Airlines logo]()
$729
One-way flights from Illinois to HeathrowSearch for one-way flight options from Illinois to Heathrow. Find affordable one-way fares based on user searches. Data last updated September 22, 2026.
Search for one-way flight options from Illinois to Heathrow. Find affordable one-way fares based on user searches. Data last updated September 22, 2026.
This Booking.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/76:30 pm -
1 stop19h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Icelandair logo]()
$299
This Booking.com deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1110:25 pm -
1 stop31h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Icelandair logo]()
$300
This Justfly.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/166:30 pm -
1 stop19h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Icelandair logo]()
$302
This oojo deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/86:30 pm -
1 stop19h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Icelandair logo]()
$303
This Gotogate deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:30 pm -
1 stop10h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Icelandair logo]()
$304
This Cheapflightsfares deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/86:30 pm -
1 stop10h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Icelandair logo]()
$306
This Gotogate deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/210:25 pm -
1 stop31h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Icelandair logo]()
$307
This lastminute.com deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/304:25 pm -
1 stop10h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Virgin Atlantic logo]()
$308
This Kiwi.com deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/410:25 pm -
2 stops35h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Multiple Airlines logo]()
$311
This Mytrip deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/277:30 pm -
2 stops17h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Multiple Airlines logo]()
$312
This Air France deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/111:00 pm -
1 stop11h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Air France logo]()
$326
This Delta deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/11:00 pm -
2 stops12h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Delta logo]()
$329
Find flight deals from Illinois to Heathrow
Keep the following information in mind while searching for Illinois to Heathrow flight deals. Data was last updated September 22, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $723 (Booking.com) |
One-way from | $299 (Booking.com) |
Popular in | June |
Cheapest in | February |
Average price | $905 |
Good round-trip deal | $876 or less |
Good one-way deal | $453 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 22, 2026.
Use the filters below to find and compare flights from Illinois to London Heathrow Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoLondon
ORD Chicago O'Hare Intl - LHR London Heathrow
ORDLHR
Chicago O'Hare Intl
Wed 10/21
9:38 am-6:30 am
1 stop14h 52m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$329
ChicagoLondon
MDW Chicago Midway - LHR London Heathrow
MDWLHR
Chicago Midway
Mon 1/18
6:00 am-9:00 am
1 stop21h 00m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$329
ChicagoLondon
MDW Chicago Midway - LHR London Heathrow
MDWLHR
Chicago Midway
Fri 3/5
1:00 pm-10:30 am
2 stops15h 30m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$379
ChicagoLondon
MDW Chicago Midway - LHR London Heathrow
MDWLHR
Chicago Midway
Thu 3/4
10:35 am-7:45 am
2 stops15h 10m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$379
St. LouisLondon
STL Lambert-St Louis - LHR London Heathrow
STLLHR
Lambert-St Louis
Wed 12/16
12:31 pm-9:55 am
2 stops15h 24m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$404
MolineLondon
MLI Moline Quad-City - LHR London Heathrow
MLILHR
Moline Quad-City
Sun 11/1
6:00 am-7:20 am
2 stops19h 20m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$463
MolineLondon
MLI Moline Quad-City - LHR London Heathrow
MLILHR
Moline Quad-City
Sun 11/1
6:00 am-7:50 am
1 stop19h 50m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$504
ChicagoLondon
MDW Chicago Midway - LHR London Heathrow
MDWLHR
Chicago Midway
Sun 10/11
12:49 pm-7:15 am
1 stop12h 26m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$507
ChicagoLondon
ORD Chicago O'Hare Intl - LHR London Heathrow
ORDLHR
Chicago O'Hare Intl
Wed 10/21
1:23 pm-12:05 pm
2 stops16h 42m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$509
ChicagoLondon
MDW Chicago Midway - LHR London Heathrow
MDWLHR
Chicago Midway
Tue 10/20
5:31 pm-10:20 am
1 stop10h 49m
London Heathrow
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$509
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to Heathrow
Have a flexible travel schedule? Discover the best time to fly to Heathrow from Illinois with our price prediction graph.
ORD-LHR
MDW-LHR
MLI-LHR
PIA-LHR
STL-LHR
Estimated round-trip 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 Illinois to London Heathrow Airport
USIL-LHR
ORD-LHR
MDW-LHR
MLI-LHR
PIA-LHR
What is the cheapest month to book a flight from Illinois to London Heathrow Airport?
Currently, January is the cheapest month in which you can book a flight from Illinois to London Heathrow Airport (average of $636). Flying from Illinois to London Heathrow Airport in June is currently the most expensive (average of $1,384). 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 IL to LHR?
Find hourly flight availability from Illinois to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 22, 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to London Heathrow Airport as you normally would.
Weekly flight availability from Illinois to London Heathrow Airport
Explore weekly flight availability from Illinois to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 22, 2026.
The most flights from USIL to LHR are scheduled on a Monday (54 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (45 on average).
How much does it cost to fly round-trip from Illinois to London Heathrow Airport?
Airfare is below average for this route at the moment.
Illinois to London Heathrow Airport flights typically cost between $760 and $1,032 in October.The cheapest round-trip price found within the last 5 days was $723 on Aer Lingus (Oct 9-Oct 14).
How far ahead should I book a flight from Illinois to London Heathrow Airport?
The best time to book flights from Illinois to London Heathrow Airport is 9 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Related info for your journey
Find useful and relevant information for your journey from Illinois to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near London Heathrow Airport?
Book flights to London Heathrow Airport if you plan to visit one of these locationsIlford
Dorking
Gatwick
Hounslow
Harrow
Wembley
Southend-on-Sea
Basingstoke
Watford
Northampton
Dartford
Winchester
Croydon
Chipping Norton
Kingston upon Thames
Eastbourne
Slough
Stansted
Sutton
Luton
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.
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Alternative routes for Illinois to Heathrow
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Heathrow by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to Heathrow by cabin class
Find flights from Illinois to Heathrow, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Heathrow
Explore flights to Heathrow departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 22, 2026.
Illinois and Heathrow flights
Browse other Illinois and Heathrow flight options. Last updated on September 22, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Illinois to Heathrow flights
Consider these flights traveling from Illinois to Heathrow.
Top 10 airlines flying from Illinois to Heathrow
Discover the top 10 airlines that operate flights from Illinois to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$286 | Average$1,411 | FlexibilityNo cancel fee | On-time78% | |
| Cheapest$362 | Average$890 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$432 | Average$728 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$458 | Average$823 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$476 | Average$685 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$482 | Average$637 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$522 | Average$809 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$575 | Average$934 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$596 | Average$929 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$609 | Average$916 | FlexibilityNo cancel fee | On-time77% |