$103+ Cheap flights from Illinois to Idaho
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 3/16. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Mar 23 — Mar 301
1 adult, Economy
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Find cheap flights from Illinois to Idaho with Cheapflights
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Cheapest flights from Illinois to IdahoExplore the most affordable flight options available from Illinois to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 21, 2026.
Explore the most affordable flight options available from Illinois to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 21, 2026.
This United Airlines deal was found by Cheapflights users on 2/18. 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.
Sun 3/228:42 am
ORD
- SUN
Nonstop4h 11m
United Airlines
Fri 3/2712:34 pm
SUN
- ORD
Nonstop3h 31m
United Airlines
Deal found 2/18![United Airlines logo]()
$205
This CheapOair deal was found by Cheapflights users on 2/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/83:29 pm
ORD
- BOI
1 stop20h 39m
Frontier
Sun 4/1212:03 pm
BOI
- ORD
1 stop24h 16m
Frontier
Deal found 2/19![Frontier logo]()
$222
This Delta deal was found by Cheapflights users on 2/17. 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.
Sun 3/157:25 am
ORD
- SUN
1 stop7h 06m
Delta
Thu 3/1912:40 pm
SUN
- ORD
1 stop7h 54m
Delta
Deal found 2/17![Delta logo]()
$225
This Alaska Airlines deal was found by Cheapflights users on 2/20. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/178:00 am
ORD
- BOI
1 stop8h 29m
Alaska Airlines
Mon 4/208:28 pm
BOI
- ORD
1 stop9h 11m
Alaska Airlines
Deal found 2/20![Alaska Airlines logo]()
$229
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/127:40 am
ORD
- JAC
1 stop29h 44m
Alaska Airlines
Sun 3/1511:48 am
JAC
- ORD
1 stop11h 11m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$233
This Alaska Airlines deal was found by Cheapflights users on 2/20. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:00 am
ORD
- GEG
1 stop8h 30m
Alaska Airlines
Sat 8/2912:36 pm
GEG
- ORD
1 stop9h 05m
Alaska Airlines
Deal found 2/20![Alaska Airlines logo]()
$235
This United Airlines deal was found by Cheapflights users on 2/17. 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.
Sun 3/158:42 am
ORD
- SUN
Nonstop4h 11m
United Airlines
Thu 3/192:33 pm
SUN
- ORD
1 stop7h 22m
United Airlines
Deal found 2/17![United Airlines logo]()
$239
This Alaska Airlines deal was found by Cheapflights users on 2/20. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/292:10 pm
ORD
- GEG
1 stop9h 35m
Alaska Airlines
Tue 6/212:46 pm
GEG
- ORD
1 stop8h 13m
Alaska Airlines
Deal found 2/20![Alaska Airlines logo]()
$242
This American Airlines deal was found by Cheapflights users on 2/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/229:55 am
ORD
- SUN
Nonstop4h 04m
American Airlines
Fri 3/271:26 pm
SUN
- ORD
Nonstop3h 33m
American Airlines
Deal found 2/18![American Airlines logo]()
$243
This American Airlines deal was found by Cheapflights users on 2/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/36:00 am
STL
- JAC
1 stop7h 18m
American Airlines
Fri 4/101:25 pm
JAC
- STL
1 stop8h 34m
American Airlines
Deal found 2/19![American Airlines logo]()
$249
This American Airlines deal was found by Cheapflights users on 2/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/29:54 am
ORD
- BOI
Nonstop3h 55m
American Airlines
Tue 5/51:29 pm
BOI
- ORD
Nonstop3h 47m
American Airlines
Deal found 2/20![American Airlines logo]()
$249
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/37:00 am
ORD
- GEG
1 stop6h 42m
Alaska Airlines
Mon 9/78:48 pm
GEG
- ORD
1 stop8h 12m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$249
Best flights from Illinois to IdahoDiscover carefully curated flight deals from Illinois to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 21, 2026.
Discover carefully curated flight deals from Illinois to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 21, 2026.
This United Airlines deal was found by Cheapflights users on 2/18. 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.
Sun 3/228:42 am
ORD
- SUN
Nonstop4h 11m
United Airlines
Fri 3/2712:34 pm
SUN
- ORD
Nonstop3h 31m
United Airlines
Deal found 2/18![United Airlines logo]()
$205
This Alaska Airlines deal was found by Cheapflights users on 2/17. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/22:13 pm
ORD
- GEG
1 stop6h 42m
Alaska Airlines
Tue 5/57:41 pm
GEG
- ORD
1 stop8h 59m
Alaska Airlines
Deal found 2/17![Alaska Airlines logo]()
$235
This American Airlines deal was found by Cheapflights users on 2/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/229:55 am
ORD
- SUN
Nonstop4h 04m
American Airlines
Fri 3/271:26 pm
SUN
- ORD
Nonstop3h 33m
American Airlines
Deal found 2/18![American Airlines logo]()
$243
This Delta deal was found by Cheapflights users on 2/20. 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.
Thu 4/92:12 pm
STL
- JAC
1 stop5h 50m
Delta
Sun 4/125:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/20![Delta logo]()
$257
This Kiwi.com deal was found by Cheapflights users on 2/16. 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.
Sat 3/78:12 pm
STL
- BOI
1 stop15h 08m
Frontier
Sun 3/1512:15 pm
BOI
- STL
1 stop20h 34m
Frontier
Deal found 2/16![Frontier logo]()
$258
This Southwest deal was found by Cheapflights users on 2/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/211:55 pm
MDW
- GEG
2 stops9h 40m
Southwest
Sat 4/251:10 pm
GEG
- MDW
1 stop6h 10m
Southwest
Deal found 2/17![Southwest logo]()
$280
This United Airlines deal was found by Cheapflights users on 2/17. 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.
Sun 3/158:42 am
ORD
- SUN
Nonstop4h 11m
United Airlines
Thu 3/1912:34 pm
SUN
- ORD
Nonstop3h 31m
United Airlines
Deal found 2/17![United Airlines logo]()
$205
This Alaska Airlines deal was found by Cheapflights users on 2/20. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/18:00 am
ORD
- BOI
1 stop8h 29m
Alaska Airlines
Tue 4/76:32 am
BOI
- ORD
1 stop11h 08m
Alaska Airlines
Deal found 2/20![Alaska Airlines logo]()
$249
This American Airlines deal was found by Cheapflights users on 2/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/99:54 am
ORD
- BOI
Nonstop3h 55m
American Airlines
Wed 4/151:29 pm
BOI
- ORD
Nonstop3h 47m
American Airlines
Deal found 2/17![American Airlines logo]()
$250
This Delta deal was found by Cheapflights users on 2/18. 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.
Fri 4/102:12 pm
STL
- JAC
1 stop5h 50m
Delta
Sun 4/125:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/18![Delta logo]()
$257
This Delta deal was found by Cheapflights users on 2/18. 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 3/252:12 pm
STL
- JAC
1 stop5h 50m
Delta
Mon 3/305:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/18![Delta logo]()
$257
This American Airlines deal was found by Cheapflights users on 2/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/289:51 am
ORD
- SUN
Nonstop4h 04m
American Airlines
Wed 4/11:27 pm
SUN
- ORD
Nonstop3h 33m
American Airlines
Deal found 2/18![American Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 2/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/105:55 am
MDW
- GEG
1 stop5h 55m
Southwest
Sat 3/1410:30 am
GEG
- MDW
1 stop9h 20m
Southwest
Deal found 2/17![Southwest logo]()
$283
This United Airlines deal was found by Cheapflights users on 2/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/58:40 am
ORD
- BOI
Nonstop3h 52m
United Airlines
Tue 8/112:43 pm
BOI
- ORD
1 stop7h 01m
United Airlines
Deal found 2/20![United Airlines logo]()
$259
This Kiwi.com deal was found by Cheapflights users on 2/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/254:51 pm
STL
- BOI
1 stop20h 00m
Frontier
Fri 2/2711:56 am
BOI
- STL
1 stop25h 00m
Frontier
Deal found 2/18![Frontier logo]()
$292
This Alaska Airlines deal was found by Cheapflights users on 2/18. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/47:00 am
ORD
- GEG
1 stop9h 36m
Alaska Airlines
Wed 3/118:29 pm
GEG
- ORD
1 stop13h 32m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$271
This American Airlines deal was found by Cheapflights users on 2/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/229:55 am
ORD
- SUN
Nonstop4h 04m
American Airlines
Sat 3/281:27 pm
SUN
- ORD
Nonstop3h 33m
American Airlines
Deal found 2/18![American Airlines logo]()
$257
This United Airlines deal was found by Cheapflights users on 2/17. 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.
Tue 3/178:55 am
ORD
- BOI
Nonstop4h 18m
United Airlines
Tue 3/245:00 am
BOI
- ORD
1 stop5h 19m
United Airlines
Deal found 2/17![United Airlines logo]()
$259
This Delta deal was found by Cheapflights users on 2/20. 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.
Mon 4/62:05 pm
MDW
- BOI
1 stop8h 04m
Delta
Mon 4/1311:35 pm
BOI
- MDW
1 stop9h 21m
Delta
Deal found 2/20![Delta logo]()
$269
This Southwest deal was found by Cheapflights users on 2/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/94:35 pm
MDW
- BOI
2 stops9h 25m
Southwest
Wed 4/156:40 am
BOI
- MDW
1 stop8h 15m
Southwest
Deal found 2/17![Southwest logo]()
$304
This American Airlines deal was found by Cheapflights users on 2/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/2911:17 am
ORD
- GEG
Nonstop3h 57m
American Airlines
Tue 6/22:05 pm
GEG
- ORD
Nonstop3h 59m
American Airlines
Deal found 2/18![American Airlines logo]()
$262
This United Airlines deal was found by Cheapflights users on 2/17. 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.
Tue 4/214:35 pm
ORD
- GEG
Nonstop4h 16m
United Airlines
Sat 4/251:46 pm
GEG
- ORD
1 stop8h 43m
United Airlines
Deal found 2/17![United Airlines logo]()
$265
This Delta deal was found by Cheapflights users on 2/17. 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 4/179:29 am
MDW
- BOI
1 stop5h 57m
Delta
Mon 4/2011:35 pm
BOI
- MDW
1 stop9h 21m
Delta
Deal found 2/17![Delta logo]()
$269
This Southwest deal was found by Cheapflights users on 2/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/78:10 pm
MDW
- GEG
1 stop7h 20m
Southwest
Sat 3/1410:30 am
GEG
- MDW
1 stop9h 20m
Southwest
Deal found 2/17![Southwest logo]()
$317
This Delta deal was found by Cheapflights users on 2/19. 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.
Fri 5/296:20 pm
ORD
- BOI
1 stop6h 35m
Delta
Sat 6/66:00 am
BOI
- ORD
1 stop6h 31m
Delta
Deal found 2/19![Delta logo]()
$269
This United Airlines deal was found by Cheapflights users on 2/18. 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.
Sat 5/23:00 pm
ORD
- BOI
1 stop7h 17m
United Airlines
Tue 5/55:00 am
BOI
- ORD
1 stop5h 53m
United Airlines
Deal found 2/18![United Airlines logo]()
$269
This Alaska Airlines deal was found by Cheapflights users on 2/17. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:00 am
ORD
- IDA
1 stop10h 29m
Alaska Airlines
Sat 4/256:00 am
IDA
- ORD
1 stop7h 56m
Alaska Airlines
Deal found 2/17![Alaska Airlines logo]()
$337
This Southwest deal was found by Cheapflights users on 2/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/96:15 am
MDW
- GEG
1 stop8h 10m
Southwest
Sat 5/162:25 pm
GEG
- MDW
1 stop12h 35m
Southwest
Deal found 2/17![Southwest logo]()
$320
This Delta deal was found by Cheapflights users on 2/20. 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 8/56:00 pm
ORD
- BOI
1 stop6h 59m
Delta
Tue 8/111:15 pm
BOI
- ORD
1 stop7h 43m
Delta
Deal found 2/20![Delta logo]()
$269
This United Airlines deal was found by Cheapflights users on 2/16. 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 3/22:02 pm
ORD
- SUN
1 stop8h 17m
United Airlines
Thu 3/52:33 pm
SUN
- ORD
1 stop5h 56m
United Airlines
Deal found 2/16![United Airlines logo]()
$276
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated February 21, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated February 21, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 2/16. 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.
Sat 3/78:12 pm
STL
- BOI
1 stop15h 08m
Frontier
Sun 3/1512:15 pm
BOI
- STL
1 stop20h 34m
Frontier
Deal found 2/16![Frontier logo]()
$258
This American Airlines deal was found by Cheapflights users on 2/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/109:50 am
ORD
- SUN
Nonstop4h 04m
American Airlines
Tue 3/171:27 pm
SUN
- ORD
Nonstop3h 33m
American Airlines
Deal found 2/20![American Airlines logo]()
$255
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/127:40 am
ORD
- JAC
1 stop29h 44m
Alaska Airlines
Sun 3/1511:48 am
JAC
- ORD
1 stop11h 11m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$233
This Delta deal was found by Cheapflights users on 2/17. 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.
Sun 3/157:25 am
ORD
- SUN
1 stop7h 06m
Delta
Thu 3/1912:40 pm
SUN
- ORD
1 stop7h 54m
Delta
Deal found 2/17![Delta logo]()
$225
This United Airlines deal was found by Cheapflights users on 2/17. 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.
Sun 3/158:42 am
ORD
- SUN
Nonstop4h 11m
United Airlines
Thu 3/192:33 pm
SUN
- ORD
1 stop7h 22m
United Airlines
Deal found 2/17![United Airlines logo]()
$239
This Expedia deal was found by Cheapflights users on 2/18. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/177:00 am
ORD
- BOI
1 stop9h 08m
Alaska Airlines
Mon 3/306:04 pm
BOI
- ORD
1 stop11h 35m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$229
This American Airlines deal was found by Cheapflights users on 2/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/179:45 am
ORD
- GEG
Nonstop3h 59m
American Airlines
Wed 3/1812:25 pm
GEG
- ORD
Nonstop3h 43m
American Airlines
Deal found 2/20![American Airlines logo]()
$257
This United Airlines deal was found by Cheapflights users on 2/18. 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.
Sun 3/228:42 am
ORD
- SUN
Nonstop4h 11m
United Airlines
Fri 3/2712:34 pm
SUN
- ORD
Nonstop3h 31m
United Airlines
Deal found 2/18![United Airlines logo]()
$205
This American Airlines deal was found by Cheapflights users on 2/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/229:55 am
ORD
- SUN
Nonstop4h 04m
American Airlines
Fri 3/271:26 pm
SUN
- ORD
Nonstop3h 33m
American Airlines
Deal found 2/18![American Airlines logo]()
$243
This American Airlines deal was found by Cheapflights users on 2/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/229:55 am
ORD
- SUN
Nonstop4h 04m
American Airlines
Sat 3/281:27 pm
SUN
- ORD
Nonstop3h 33m
American Airlines
Deal found 2/19![American Airlines logo]()
$257
This Delta deal was found by Cheapflights users on 2/20. 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 3/257:15 am
STL
- JAC
1 stop5h 55m
Delta
Mon 3/305:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/20![Delta logo]()
$257
This American Airlines deal was found by Cheapflights users on 2/21. 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.
Sat 3/289:51 am
ORD
- SUN
Nonstop4h 04m
American Airlines
Wed 4/11:27 pm
SUN
- ORD
Nonstop3h 33m
American Airlines
Deal found 2/21![American Airlines logo]()
$258
One-way flights from Illinois to IdahoSearch for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated February 21, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated February 21, 2026.
This American Airlines deal was found by Cheapflights users on 2/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/169:50 am
ORD
- SUN
Nonstop4h 04m
American Airlines
Deal found 2/17![American Airlines logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 2/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/205:09 pm
ORD
- GEG
1 stop28h 46m
Multiple Airlines
Deal found 2/17![Multiple Airlines logo]()
$107
This Kiwi.com deal was found by Cheapflights users on 2/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/143:27 pm
ORD
- BOI
2 stops44h 41m
Frontier
Deal found 2/18![Frontier logo]()
$109
This Delta deal was found by Cheapflights users on 2/17. 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.
Tue 3/177:20 am
ORD
- SUN
1 stop8h 29m
Delta
Deal found 2/17![Delta logo]()
$113
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/166:00 am
ORD
- BOI
1 stop7h 22m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$115
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/153:27 pm
ORD
- BOI
2 stops20h 41m
Frontier
Deal found 2/19![Frontier logo]()
$116
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/158:00 am
ORD
- GEG
1 stop7h 53m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 2/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/168:43 am
ORD
- BOI
2 stops27h 25m
Frontier
Deal found 2/18![Frontier logo]()
$121
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/158:25 am
ORD
- GEG
2 stops28h 24m
Frontier
Deal found 2/19![Frontier logo]()
$121
This Alaska Airlines deal was found by Cheapflights users on 2/18. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/117:40 am
ORD
- JAC
1 stop29h 44m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 2/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/159:18 pm
ORD
- GEG
1 stop25h 11m
Multiple Airlines
Deal found 2/17![Multiple Airlines logo]()
$123
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/183:23 pm
ORD
- BOI
2 stops20h 45m
Frontier
Deal found 2/19![Frontier logo]()
$124
Find flight deals from Illinois to Idaho
Keep the following information in mind while searching for Illinois to Idaho flight deals. Data was last updated February 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $205 (United Airlines) |
One-way from | $103 (American Airlines) |
Popular in | November |
Cheapest in | October |
Average price | $306 |
Good round-trip deal | $306 or less |
Good one-way deal | $254 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to Idaho 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 2,558,603 searches. Data last updated February 21, 2026.
Use the filters below to find and compare flights from Illinois to Idaho that are best for you.
Fly from
Illinois
Fly to
Idaho
Route
Depart
Return
Price
ChicagoHailey
ORD - SUN
ORDSUN
Chicago O'Hare Intl
Sun 3/22
8:42 am-11:53 am
Nonstop4h 11m
Hailey Sun Valley-Friedman
Fri 3/27
12:34 pm-5:05 pm
Nonstop3h 31m
$205
ChicagoHailey
ORD - SUN
ORDSUN
Chicago O'Hare Intl
Sun 3/15
8:42 am-11:53 am
Nonstop4h 11m
Hailey Sun Valley-Friedman
Thu 3/19
12:34 pm-5:05 pm
Nonstop3h 31m
$205
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 5/2
2:13 pm-6:55 pm
1 stop6h 42m
Spokane
Tue 5/5
7:41 pm-6:40 am
1 stop8h 59m
$235
ChicagoHailey
ORD - SUN
ORDSUN
Chicago O'Hare Intl
Sun 3/22
9:55 am-12:59 pm
Nonstop4h 04m
Hailey Sun Valley-Friedman
Fri 3/27
1:26 pm-5:59 pm
Nonstop3h 33m
$243
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Wed 4/1
8:00 am-3:29 pm
1 stop8h 29m
Boise Air Term. Gowen Fld
Tue 4/7
6:32 am-6:40 pm
1 stop11h 08m
$249
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Thu 4/9
9:54 am-12:49 pm
Nonstop3h 55m
Boise Air Term. Gowen Fld
Wed 4/15
1:29 pm-6:16 pm
Nonstop3h 47m
$250
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Thu 4/9
2:12 pm-7:02 pm
1 stop5h 50m
Jackson Hole
Sun 4/12
5:50 pm-12:21 am
1 stop5h 31m
$257
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Fri 4/10
2:12 pm-7:02 pm
1 stop5h 50m
Jackson Hole
Sun 4/12
5:50 pm-12:21 am
1 stop5h 31m
$257
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Wed 3/25
2:12 pm-7:02 pm
1 stop5h 50m
Jackson Hole
Mon 3/30
5:50 pm-12:21 am
1 stop5h 31m
$257
ChicagoHailey
ORD - SUN
ORDSUN
Chicago O'Hare Intl
Sat 3/28
9:51 am-12:55 pm
Nonstop4h 04m
Hailey Sun Valley-Friedman
Wed 4/1
1:27 pm-6:00 pm
Nonstop3h 33m
$257
Showing 1-10 of 60 results
Best time to book a flight from Illinois to Idaho
Have a flexible travel schedule? Discover the best time to fly to Idaho from Illinois with our price prediction graph.
ORD-SUN
ORD-BOI
ORD-JAC
ORD-GEG
STL-JAC
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 Idaho
USIL-USID
ORD-SUN
ORD-BOI
ORD-JAC
ORD-GEG
What is the cheapest month to book a flight from Illinois to Idaho?
Currently, July is the cheapest month in which you can book a flight from Illinois to Idaho (average of $149). Flying from Illinois to Idaho in December is currently the most expensive (average of $288). 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 ID?
Find hourly flight availability from Illinois to Idaho. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 21, 2026.
It’s typically best to fly out from Illinois to Idaho at noon. Doing so could potentially save you 19% on the flight price compared to flying in the afternoon, which is usually more expensive.
Weekly flight availability from Illinois to Idaho
Explore weekly flight availability from Illinois to Idaho. 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 February 21, 2026.
The most flights from USIL to USID are scheduled on a Monday (6 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (3 on average).
Reviews of airlines servicing Idaho
Get insights into the airlines that provide service to Idaho. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Idaho. Reviews last updated February 21, 2026.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta from Illinois to Idaho. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.1
Comfort
7.8
Crew
8.5
Overall
8.0
Entertainment
7.0
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Food
7.1
Comfort
7.8
Crew
8.5
Overall
8.0
Entertainment
7.0
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Food
7.1
Comfort
7.8
Crew
8.5
Overall
8.0
Entertainment
7.0
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Food
7.1
Comfort
7.8
Crew
8.5
Overall
8.0
Entertainment
7.0
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Food
7.1
Comfort
7.8
Crew
8.5
Overall
8.0
Entertainment
7.0
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Food
7.1
Comfort
7.8
Crew
8.5
Overall
8.0
Entertainment
7.0
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Related info for your journey
Find useful and relevant information for your journey from Illinois to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Illinois to Idaho
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Idaho by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to Idaho by cabin class
Find flights from Illinois to Idaho, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Idaho flights
Browse other Illinois and Idaho flight options. Last updated on February 21, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Idaho
Find the right flight back to Illinois after your stay in Idaho
Illinois to Idaho flights
Consider these flights traveling from Illinois to Idaho.
Top 4 airlines flying from Illinois to Idaho
Discover the top 4 airlines that operate flights from Illinois to Idaho. 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 2,558,603 searches. Data last updated February 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$174 | Average$333 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$237 | Average$439 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$248 | Average$485 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$254 | Average$368 | FlexibilityNo cancel fee | On-time63% |