$104+ 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 4/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Mar 28 — Apr 41
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 26, 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 26, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/22. 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 4/88:00 am
ORD
- BOI
1 stop8h 29m
Hawaiian Airlines
Wed 4/158:28 pm
BOI
- ORD
1 stop9h 11m
Hawaiian Airlines
Deal found 2/22![Hawaiian Airlines logo]()
$209
This Delta deal was found by Cheapflights users on 2/25. 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.
Sat 5/212:46 pm
ORD
- BOI
1 stop9h 38m
Delta
Tue 5/57:24 am
BOI
- ORD
1 stop8h 15m
Delta
Deal found 2/25![Delta logo]()
$213
This CheapOair deal was found by Cheapflights users on 2/25. 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 2/25![Frontier logo]()
$222
This Alaska Airlines deal was found by Cheapflights users on 2/25. 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 4/156:00 am
ORD
- BOI
1 stop7h 22m
Alaska Airlines
Wed 4/154:15 pm
BOI
- ORD
1 stop6h 44m
Alaska Airlines
Deal found 2/25![Alaska Airlines logo]()
$223
This American Airlines deal was found by Cheapflights users on 2/22. 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 4/119:54 am
ORD
- BOI
Nonstop3h 55m
American Airlines
Tue 4/141:29 pm
BOI
- ORD
Nonstop3h 47m
American Airlines
Deal found 2/22![American Airlines logo]()
$227
This Alaska Airlines deal was found by Cheapflights users on 2/25. 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.
Tue 4/146:00 am
ORD
- BOI
1 stop8h 58m
Alaska Airlines
Thu 4/168:28 pm
BOI
- ORD
1 stop9h 11m
Alaska Airlines
Deal found 2/25![Alaska Airlines logo]()
$229
This Alaska Airlines deal was found by Cheapflights users on 2/24. 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 8/227:00 am
ORD
- GEG
1 stop6h 42m
Alaska Airlines
Sat 8/2912:36 pm
GEG
- ORD
1 stop9h 05m
Alaska Airlines
Deal found 2/24![Alaska Airlines logo]()
$235
This American Airlines deal was found by Cheapflights users on 2/22. 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 9/199:45 am
ORD
- BOI
Nonstop3h 46m
American Airlines
Sat 9/261:42 pm
BOI
- ORD
1 stop9h 43m
American Airlines
Deal found 2/22![American Airlines logo]()
$236
This United Airlines deal was found by Cheapflights users on 2/22. 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 5/24:40 pm
ORD
- BOI
Nonstop3h 53m
United Airlines
Tue 5/55:00 am
BOI
- ORD
1 stop5h 53m
United Airlines
Deal found 2/22![United Airlines logo]()
$237
This Delta deal was found by Cheapflights users on 2/25. 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 4/247:15 am
ORD
- GEG
1 stop7h 12m
Delta
Wed 4/296:15 am
GEG
- ORD
1 stop8h 24m
Delta
Deal found 2/25![Delta logo]()
$239
This CheapOair deal was found by Cheapflights users on 2/24. 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 5/132:10 pm
ORD
- BOI
1 stop8h 10m
Alaska Airlines
Tue 5/194:19 pm
BOI
- ORD
1 stop6h 40m
Alaska Airlines
Deal found 2/24![Alaska Airlines logo]()
$241
This Alaska Airlines deal was found by Cheapflights users on 2/23. 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 6/23:10 pm
GEG
- ORD
1 stop6h 49m
Alaska Airlines
Deal found 2/23![Alaska Airlines logo]()
$242
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 26, 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 26, 2026.
This Delta deal was found by Cheapflights users on 2/25. 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 4/246:00 pm
ORD
- GEG
1 stop8h 20m
Delta
Wed 4/297:38 pm
GEG
- ORD
2 stops10h 23m
Delta
Deal found 2/25![Delta logo]()
$244
This Southwest deal was found by Cheapflights users on 2/22. 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 4/185:30 pm
MDW
- GEG
1 stop5h 45m
Southwest
Sat 4/251:10 pm
GEG
- MDW
1 stop6h 10m
Southwest
Deal found 2/22![Southwest logo]()
$246
This United Airlines deal was found by Cheapflights users on 2/25. 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 3/255:15 am
STL
- JAC
1 stop5h 36m
United Airlines
Wed 4/12:35 pm
JAC
- STL
1 stop5h 19m
United Airlines
Deal found 2/25![United Airlines logo]()
$249
This Alaska Airlines deal was found by Cheapflights users on 2/26. 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 4/78:04 pm
BOI
- ORD
1 stop21h 58m
Alaska Airlines
Deal found 2/26![Alaska Airlines logo]()
$267
This American Airlines deal was found by Cheapflights users on 2/23. 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.
Wed 3/256:00 am
STL
- GEG
1 stop7h 44m
American Airlines
Sat 4/181:22 pm
GEG
- STL
1 stop6h 55m
American Airlines
Deal found 2/23![American Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 2/23. 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 3/257:03 am
STL
- JAC
1 stop7h 27m
Delta
Mon 3/305:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/23![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 2/22. 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 3/248:55 am
ORD
- JAC
Nonstop3h 29m
United Airlines
Tue 3/314:15 pm
JAC
- ORD
1 stop7h 15m
United Airlines
Deal found 2/22![United Airlines logo]()
$260
This Southwest deal was found by Cheapflights users on 2/25. 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.
Fri 4/246:55 am
MDW
- GEG
1 stop9h 15m
Southwest
Wed 4/292:25 pm
GEG
- MDW
1 stop6h 55m
Southwest
Deal found 2/25![Southwest logo]()
$262
This Alaska Airlines deal was found by Cheapflights users on 2/24. 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 5/272:10 pm
ORD
- GEG
1 stop9h 35m
Alaska Airlines
Sun 5/315:00 am
GEG
- ORD
1 stop6h 22m
Alaska Airlines
Deal found 2/24![Alaska Airlines logo]()
$272
This Delta deal was found by Cheapflights users on 2/25. 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 3/2510:12 am
STL
- JAC
2 stops9h 50m
Delta
Wed 4/15:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/25![Delta logo]()
$262
This United Airlines deal was found by Cheapflights users on 2/22. 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 4/182:30 pm
ORD
- GEG
1 stop8h 41m
United Airlines
Sat 4/257:10 am
GEG
- ORD
Nonstop3h 46m
United Airlines
Deal found 2/22![United Airlines logo]()
$265
This Southwest deal was found by Cheapflights users on 2/22. 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.
Fri 4/36:35 pm
MDW
- BOI
2 stops7h 45m
Southwest
Tue 4/76:00 am
BOI
- MDW
1 stop7h 10m
Southwest
Deal found 2/22![Southwest logo]()
$274
This Delta deal was found by Cheapflights users on 2/25. 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 4/249:29 am
MDW
- GEG
1 stop5h 35m
Delta
Wed 4/297:38 pm
GEG
- MDW
2 stops11h 09m
Delta
Deal found 2/25![Delta logo]()
$263
This United Airlines deal was found by Cheapflights users on 2/22. 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 4/112:30 pm
ORD
- BOI
1 stop8h 04m
United Airlines
Tue 4/145:29 pm
BOI
- ORD
1 stop6h 01m
United Airlines
Deal found 2/22![United Airlines logo]()
$269
This Alaska Airlines deal was found by Cheapflights users on 2/22. 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 8/223:09 pm
ORD
- IDA
1 stop8h 30m
Alaska Airlines
Sat 8/294:03 pm
IDA
- ORD
1 stop6h 56m
Alaska Airlines
Deal found 2/22![Alaska Airlines logo]()
$303
This Southwest deal was found by Cheapflights users on 2/26. 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 6/45:20 am
MDW
- GEG
1 stop9h 00m
Southwest
Mon 6/86:25 am
GEG
- MDW
Nonstop3h 30m
Southwest
Deal found 2/26![Southwest logo]()
$279
This Delta deal was found by Cheapflights users on 2/23. 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 4/2212:46 pm
ORD
- BOI
1 stop8h 14m
Delta
Sun 4/265:40 am
BOI
- ORD
1 stop6h 43m
Delta
Deal found 2/23![Delta logo]()
$265
This United Airlines deal was found by Cheapflights users on 2/24. 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.
Fri 4/37:50 pm
ORD
- GEG
Nonstop4h 16m
United Airlines
Wed 4/81:46 pm
GEG
- ORD
1 stop8h 44m
United Airlines
Deal found 2/24![United Airlines logo]()
$272
This Southwest deal was found by Cheapflights users on 2/24. 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.
Fri 4/36:35 pm
MDW
- GEG
2 stops8h 30m
Southwest
Sat 4/114:50 pm
GEG
- MDW
1 stop11h 10m
Southwest
Deal found 2/24![Southwest logo]()
$283
This Delta deal was found by Cheapflights users on 2/22. 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 4/37:25 am
ORD
- BOI
1 stop9h 38m
Delta
Mon 4/61:45 pm
BOI
- ORD
1 stop9h 07m
Delta
Deal found 2/22![Delta logo]()
$269
This United Airlines deal was found by Cheapflights users on 2/25. 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.
Fri 4/242:05 pm
ORD
- GEG
1 stop9h 06m
United Airlines
Wed 4/297:10 am
GEG
- ORD
Nonstop3h 46m
United Airlines
Deal found 2/25![United Airlines logo]()
$272
This Alaska Airlines deal was found by Cheapflights users on 2/24. 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 4/177:00 am
STL
- BOI
1 stop17h 56m
Alaska Airlines
Mon 4/276:08 pm
BOI
- STL
1 stop28h 51m
Alaska Airlines
Deal found 2/24![Alaska Airlines logo]()
$335
This Delta deal was found by Cheapflights users on 2/24. 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 4/11:19 pm
ORD
- BOI
2 stops11h 27m
Delta
Tue 4/74:43 pm
BOI
- ORD
1 stop6h 57m
Delta
Deal found 2/24![Delta logo]()
$270
This United Airlines deal was found by Cheapflights users on 2/24. 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.
Fri 4/37:50 pm
ORD
- GEG
Nonstop4h 16m
United Airlines
Sat 4/111:46 pm
GEG
- ORD
1 stop8h 43m
United Airlines
Deal found 2/24![United Airlines logo]()
$272
This Alaska Airlines deal was found by Cheapflights users on 2/22. 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 8/228:42 pm
ORD
- JAC
1 stop15h 29m
Alaska Airlines
Sat 8/2911:40 am
JAC
- ORD
1 stop11h 01m
Alaska Airlines
Deal found 2/22![Alaska Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 2/24. 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 5/156:20 pm
ORD
- BOI
1 stop6h 35m
Delta
Mon 5/2511:39 pm
BOI
- ORD
2 stops9h 48m
Delta
Deal found 2/24![Delta logo]()
$274
This Southwest deal was found by Cheapflights users on 2/25. 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 4/96:40 am
MDW
- BOI
1 stop10h 00m
Southwest
Sat 4/113:25 pm
BOI
- MDW
1 stop13h 15m
Southwest
Deal found 2/25![Southwest logo]()
$334
This United Airlines deal was found by Cheapflights users on 2/22. 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.
Fri 4/37:50 pm
ORD
- BOI
Nonstop4h 07m
United Airlines
Wed 4/85:29 pm
BOI
- ORD
1 stop6h 01m
United Airlines
Deal found 2/22![United Airlines logo]()
$289
This Delta deal was found by Cheapflights users on 2/22. 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.
Sat 3/215:29 pm
STL
- GEG
1 stop6h 00m
Delta
Wed 3/251:50 pm
GEG
- STL
1 stop8h 31m
Delta
Deal found 2/22![Delta logo]()
$277
This Alaska Airlines deal was found by Cheapflights users on 2/24. 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.
Tue 3/37:00 am
ORD
- BOI
1 stop9h 08m
Alaska Airlines
Fri 3/66:28 am
BOI
- ORD
1 stop6h 43m
Alaska Airlines
Deal found 2/24![Alaska Airlines logo]()
$374
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated February 26, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated February 26, 2026 and is based on user searches.
This Alaska Airlines deal was found by Cheapflights users on 2/23. 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.
Tue 3/107:00 am
ORD
- BOI
1 stop9h 08m
Alaska Airlines
Tue 3/179:00 pm
BOI
- ORD
1 stop8h 39m
Alaska Airlines
Deal found 2/23![Alaska Airlines logo]()
$259
This Delta deal was found by Cheapflights users on 2/25. 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 3/111:19 pm
ORD
- GEG
2 stops11h 30m
Delta
Wed 3/183:25 pm
GEG
- ORD
1 stop6h 27m
Delta
Deal found 2/25![Delta logo]()
$267
This Delta deal was found by Cheapflights users on 2/24. 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 3/177:25 am
ORD
- BOI
1 stop6h 40m
Delta
Sat 3/211:45 pm
BOI
- ORD
1 stop9h 07m
Delta
Deal found 2/24![Delta logo]()
$265
This Delta deal was found by Cheapflights users on 2/24. 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 3/185:30 am
ORD
- BOI
1 stop8h 08m
Delta
Sat 3/214:40 pm
BOI
- ORD
1 stop6h 12m
Delta
Deal found 2/24![Delta logo]()
$269
This American Airlines deal was found by Cheapflights users on 2/25. 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 3/199:45 am
ORD
- GEG
Nonstop3h 59m
American Airlines
Mon 3/2312:25 pm
GEG
- ORD
Nonstop3h 43m
American Airlines
Deal found 2/25![American Airlines logo]()
$269
This Delta deal was found by Cheapflights users on 2/26. 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 3/237:20 am
ORD
- IDA
1 stop6h 07m
Delta
Tue 3/311:10 pm
IDA
- ORD
1 stop7h 24m
Delta
Deal found 2/26![Delta logo]()
$269
This American Airlines deal was found by Cheapflights users on 2/24. 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 3/249:54 am
ORD
- JAC
Nonstop3h 24m
American Airlines
Tue 3/311:44 pm
JAC
- ORD
Nonstop3h 13m
American Airlines
Deal found 2/24![American Airlines logo]()
$250
This United Airlines deal was found by Cheapflights users on 2/24. 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 3/248:55 am
ORD
- JAC
Nonstop3h 29m
United Airlines
Tue 3/314:15 pm
JAC
- ORD
1 stop7h 15m
United Airlines
Deal found 2/24![United Airlines logo]()
$260
This United Airlines deal was found by Cheapflights users on 2/22. 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 3/243:35 pm
ORD
- GEG
Nonstop4h 16m
United Airlines
Tue 3/314:01 pm
GEG
- ORD
1 stop6h 29m
United Airlines
Deal found 2/22![United Airlines logo]()
$265
This Delta deal was found by Cheapflights users on 2/24. 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 3/247:20 am
ORD
- JAC
1 stop5h 50m
Delta
Tue 3/311:10 pm
JAC
- ORD
1 stop7h 24m
Delta
Deal found 2/24![Delta logo]()
$270
This United Airlines deal was found by Cheapflights users on 2/25. 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 3/259:00 am
STL
- JAC
1 stop5h 21m
United Airlines
Wed 4/12:35 pm
JAC
- STL
1 stop5h 19m
United Airlines
Deal found 2/25![United Airlines logo]()
$249
This Delta deal was found by Cheapflights users on 2/24. 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 3/256:29 am
STL
- JAC
1 stop7h 06m
Delta
Mon 3/305:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/24![Delta logo]()
$257
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 26, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated February 26, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/24. 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 4/72:09 pm
ORD
- BOI
1 stop6h 37m
Hawaiian Airlines
Deal found 2/24![Hawaiian Airlines logo]()
$104
This Southwest deal was found by Cheapflights users on 2/24. 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.
Wed 4/152:55 pm
MDW
- GEG
1 stop10h 00m
Southwest
Deal found 2/24![Southwest logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 2/25. 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 4/225:09 pm
ORD
- GEG
1 stop29h 20m
Multiple Airlines
Deal found 2/25![Multiple Airlines logo]()
$105
This CheapOair deal was found by Cheapflights users on 2/25. 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 3/188:12 pm
STL
- BOI
1 stop16h 08m
Frontier
Deal found 2/25![Frontier logo]()
$107
This Alaska Airlines deal was found by Cheapflights users on 2/24. 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.
Tue 4/218:20 am
ORD
- GEG
1 stop9h 14m
Alaska Airlines
Deal found 2/24![Alaska Airlines logo]()
$108
This Delta deal was found by Cheapflights users on 2/25. 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 3/247:25 am
ORD
- GEG
1 stop9h 20m
Delta
Deal found 2/25![Delta logo]()
$114
This Alaska Airlines deal was found by Cheapflights users on 2/22. 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 4/236:00 am
ORD
- BOI
1 stop8h 52m
Alaska Airlines
Deal found 2/22![Alaska Airlines logo]()
$115
This Kiwi.com deal was found by Cheapflights users on 2/24. 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 2/24![Multiple Airlines logo]()
$115
This Southwest deal was found by Cheapflights users on 2/23. 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.
Wed 4/2212:35 pm
MDW
- BOI
1 stop10h 35m
Southwest
Deal found 2/23![Southwest logo]()
$117
This Alaska Airlines deal was found by Cheapflights users on 2/24. 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
Deal found 2/24![Alaska Airlines logo]()
$118
This CheapOair deal was found by Cheapflights users on 2/24. 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.
Fri 4/248:48 pm
ORD
- BOI
1 stop13h 54m
Alaska Airlines
Deal found 2/24![Alaska Airlines logo]()
$120
This Southwest deal was found by Cheapflights users on 2/24. 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 4/76:30 am
MDW
- BOI
1 stop5h 25m
Southwest
Deal found 2/24![Southwest logo]()
$123
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 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $209 (Kiwi.com) |
One-way from | $104 (Kiwi.com) |
Popular in | November |
Cheapest in | October |
Average price | $306 |
Good round-trip deal | $336 or less |
Good one-way deal | $218 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 26, 2026.
Use the filters below to find and compare flights from Illinois to Idaho that are best for you.
Fly from
Fly to
Route
Depart
Return
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Fri 4/24
6:00 pm-12:20 am
1 stop8h 20m
Spokane
Wed 4/29
7:38 pm-8:01 am
2 stops10h 23m
$244
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Sat 4/18
5:30 pm-9:15 pm
1 stop5h 45m
Spokane
Sat 4/25
1:10 pm-9:20 pm
1 stop6h 10m
$246
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Wed 3/25
5:15 am-9:51 am
1 stop5h 36m
Jackson Hole
Wed 4/1
2:35 pm-8:54 pm
1 stop5h 19m
$249
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Wed 3/25
7:03 am-1:30 pm
1 stop7h 27m
Jackson Hole
Mon 3/30
5:50 pm-12:21 am
1 stop5h 31m
$257
ChicagoJackson
ORD - JAC
ORDJAC
Chicago O'Hare Intl
Tue 3/24
8:55 am-11:24 am
Nonstop3h 29m
Jackson Hole
Tue 3/31
4:15 pm-12:30 am
1 stop7h 15m
$260
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Fri 4/24
6:55 am-2:10 pm
1 stop9h 15m
Spokane
Wed 4/29
2:25 pm-11:20 pm
1 stop6h 55m
$262
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Wed 3/25
10:12 am-7:02 pm
2 stops9h 50m
Jackson Hole
Wed 4/1
5:50 pm-12:21 am
1 stop5h 31m
$262
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Fri 4/24
9:29 am-1:04 pm
1 stop5h 35m
Spokane
Wed 4/29
7:38 pm-8:47 am
2 stops11h 09m
$263
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 4/18
2:30 pm-9:11 pm
1 stop8h 41m
Spokane
Sat 4/25
7:10 am-12:56 pm
Nonstop3h 46m
$265
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Wed 4/22
12:46 pm-8:00 pm
1 stop8h 14m
Boise Air Term. Gowen Fld
Sun 4/26
5:40 am-1:23 pm
1 stop6h 43m
$265
Showing 1-10 of 60 resultsSorted by cheapest first
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-GEG
MDW-GEG
STL-JAC
ORD-BOI
STL-GEG
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-GEG
MDW-GEG
STL-JAC
ORD-BOI
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 26, 2026.
It’s typically best to fly out from Illinois to Idaho at noon. Doing so could potentially save you 25% 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 26, 2026.
The most flights from USIL to USID are scheduled on a Monday (6 on average). You will have fewer flight options on Saturday, 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 26, 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.
Boarding
8.1
Comfort
7.8
Crew
8.5
Food
7.1
Entertainment
7.0
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Crew
8.5
Food
7.1
Entertainment
7.0
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Crew
8.5
Food
7.1
Entertainment
7.0
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Crew
8.5
Food
7.1
Entertainment
7.0
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Crew
8.5
Food
7.1
Entertainment
7.0
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Crew
8.5
Food
7.1
Entertainment
7.0
Overall
8.0
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 26, 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 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$174 | Average$335 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$237 | Average$439 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$248 | Average$480 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$254 | Average$368 | FlexibilityNo cancel fee | On-time63% |