$96+ 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 3/11. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Mar 15 — Mar 221
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 13, 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 13, 2026.
This CheapOair deal was found by Cheapflights users on 2/13. 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 2/13![Frontier logo]()
$201
This Delta deal was found by Cheapflights users on 2/10. 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 3/302:05 pm
MDW
- BOI
1 stop8h 04m
Delta
Tue 4/75:30 am
BOI
- MDW
1 stop6h 55m
Delta
Deal found 2/10![Delta logo]()
$221
This Delta deal was found by Cheapflights users on 2/10. 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 3/147:25 am
ORD
- BOI
1 stop9h 35m
Delta
Tue 3/175:30 am
BOI
- ORD
1 stop5h 05m
Delta
Deal found 2/10![Delta logo]()
$221
This CheapOair deal was found by Cheapflights users on 2/10. 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 2/254:51 pm
STL
- BOI
1 stop20h 00m
Frontier
Sun 3/111:56 am
BOI
- STL
1 stop24h 13m
Frontier
Deal found 2/10![Frontier logo]()
$222
This Delta deal was found by Cheapflights users on 2/10. 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 4/189:46 am
MDW
- GEG
1 stop5h 17m
Delta
Tue 4/2110:40 pm
GEG
- MDW
1 stop9h 16m
Delta
Deal found 2/10![Delta logo]()
$225
This Delta deal was found by Cheapflights users on 2/10. 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 3/197:25 am
ORD
- GEG
1 stop7h 35m
Delta
Mon 3/233:25 pm
GEG
- ORD
1 stop6h 27m
Delta
Deal found 2/10![Delta logo]()
$225
This Delta deal was found by Cheapflights users on 2/10. 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 4/11:10 pm
MDW
- BOI
2 stops10h 01m
Delta
Tue 4/75:30 am
BOI
- MDW
1 stop6h 55m
Delta
Deal found 2/10![Delta logo]()
$226
This Delta deal was found by Cheapflights users on 2/10. 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 3/97:10 pm
ORD
- BOI
1 stop5h 49m
Delta
Mon 3/167:30 pm
BOI
- ORD
2 stops12h 10m
Delta
Deal found 2/10![Delta logo]()
$226
This American Airlines deal was found by Cheapflights users on 2/9. 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 3/49:45 am
ORD
- GEG
Nonstop3h 59m
American Airlines
Wed 3/1112:25 pm
GEG
- ORD
Nonstop3h 43m
American Airlines
Deal found 2/9![American Airlines logo]()
$226
This Alaska Airlines deal was found by Cheapflights users on 2/13. 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 4/17:24 pm
ORD
- BOI
1 stop15h 57m
Alaska Airlines
Sun 4/126:04 pm
BOI
- ORD
1 stop11h 35m
Alaska Airlines
Deal found 2/13![Alaska Airlines logo]()
$229
This United Airlines deal was found by Cheapflights users on 2/9. 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 3/108:55 am
ORD
- BOI
Nonstop4h 18m
United Airlines
Thu 3/192:40 pm
BOI
- ORD
1 stop8h 12m
United Airlines
Deal found 2/9![United Airlines logo]()
$230
This Alaska Airlines deal was found by Cheapflights users on 2/13. 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 3/123:07 pm
ORD
- JAC
1 stop22h 17m
Alaska Airlines
Sun 3/1511:48 am
JAC
- ORD
1 stop11h 11m
Alaska Airlines
Deal found 2/13![Alaska Airlines logo]()
$233
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 13, 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 13, 2026.
This Delta deal was found by Cheapflights users on 2/10. 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 4/19:30 am
MDW
- BOI
1 stop5h 35m
Delta
Tue 4/75:30 am
BOI
- MDW
1 stop6h 55m
Delta
Deal found 2/10![Delta logo]()
$221
This United Airlines deal was found by Cheapflights users on 2/9. 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 3/108:55 am
ORD
- BOI
Nonstop4h 18m
United Airlines
Thu 3/192:40 pm
BOI
- ORD
1 stop8h 12m
United Airlines
Deal found 2/9![United Airlines logo]()
$230
This Alaska Airlines deal was found by Cheapflights users on 2/12. 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 3/123:07 pm
ORD
- GEG
1 stop10h 52m
Alaska Airlines
Wed 3/187:43 pm
GEG
- ORD
1 stop8h 56m
Alaska Airlines
Deal found 2/12![Alaska Airlines logo]()
$242
This Southwest deal was found by Cheapflights users on 2/10. 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 4/15:10 pm
MDW
- BOI
1 stop8h 20m
Southwest
Tue 4/73:15 pm
BOI
- MDW
1 stop5h 15m
Southwest
Deal found 2/10![Southwest logo]()
$253
This American Airlines deal was found by Cheapflights users on 2/13. 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 4/2410:27 am
ORD
- GEG
Nonstop4h 02m
American Airlines
Mon 4/271:19 pm
GEG
- ORD
Nonstop3h 57m
American Airlines
Deal found 2/13![American Airlines logo]()
$269
This Kiwi.com deal was found by Cheapflights users on 2/12. 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.
Thu 2/2610:11 pm
STL
- BOI
2 stops14h 00m
Frontier
Thu 3/512:38 pm
BOI
- STL
1 stop20h 11m
Frontier
Deal found 2/12![Frontier logo]()
$276
This Expedia deal was found by Cheapflights users on 2/9. 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.
Thu 3/57:00 am
STL
- GEG
1 stop9h 36m
Multiple Airlines
Sun 3/812:40 pm
GEG
- STL
1 stop7h 22m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$289
This Delta deal was found by Cheapflights users on 2/10. 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 4/12:20 pm
ORD
- BOI
1 stop7h 41m
Delta
Tue 4/75:30 am
BOI
- ORD
1 stop5h 05m
Delta
Deal found 2/10![Delta logo]()
$221
This Delta deal was found by Cheapflights users on 2/10. 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 3/147:25 am
ORD
- BOI
1 stop9h 35m
Delta
Sat 3/214:40 pm
BOI
- ORD
1 stop6h 12m
Delta
Deal found 2/10![Delta logo]()
$221
This United Airlines deal was found by Cheapflights users on 2/13. 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 4/257:10 am
GEG
- ORD
Nonstop3h 46m
United Airlines
Deal found 2/13![United Airlines logo]()
$255
This Alaska Airlines deal was found by Cheapflights users on 2/13. 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
Sat 4/257:41 pm
GEG
- ORD
1 stop8h 59m
Alaska Airlines
Deal found 2/13![Alaska Airlines logo]()
$255
This Southwest deal was found by Cheapflights users on 2/11. 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 4/35:40 pm
MDW
- BOI
1 stop6h 40m
Southwest
Tue 4/73:15 pm
BOI
- MDW
1 stop5h 15m
Southwest
Deal found 2/11![Southwest logo]()
$269
This Delta deal was found by Cheapflights users on 2/10. 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 3/197:25 am
ORD
- GEG
1 stop7h 35m
Delta
Mon 3/233:25 pm
GEG
- ORD
1 stop6h 27m
Delta
Deal found 2/10![Delta logo]()
$225
This CheapOair deal was found by Cheapflights users on 2/11. 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 4/18:16 pm
STL
- BOI
1 stop15h 52m
Frontier
Sun 4/512:03 pm
BOI
- STL
1 stop20h 45m
Frontier
Deal found 2/11![Frontier logo]()
$281
This Alaska Airlines deal was found by Cheapflights users on 2/10. 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 3/43:07 pm
ORD
- GEG
1 stop10h 52m
Alaska Airlines
Wed 3/116:20 am
GEG
- ORD
1 stop15h 39m
Alaska Airlines
Deal found 2/10![Alaska Airlines logo]()
$260
This United Airlines deal was found by Cheapflights users on 2/13. 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 4/187:50 pm
ORD
- GEG
Nonstop4h 16m
United Airlines
Tue 4/281:46 pm
GEG
- ORD
1 stop8h 44m
United Airlines
Deal found 2/13![United Airlines logo]()
$265
This Delta deal was found by Cheapflights users on 2/10. 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 4/31:57 pm
ORD
- BOI
2 stops11h 02m
Delta
Tue 4/711:30 pm
BOI
- ORD
1 stop8h 00m
Delta
Deal found 2/10![Delta logo]()
$226
This Southwest deal was found by Cheapflights users on 2/13. 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.
Sun 4/195:10 am
MDW
- GEG
1 stop7h 25m
Southwest
Tue 4/281:45 pm
GEG
- MDW
1 stop5h 45m
Southwest
Deal found 2/13![Southwest logo]()
$282
This Expedia deal was found by Cheapflights users on 2/13. 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.
Fri 4/243:52 pm
ORD
- GEG
1 stop8h 28m
Alaska Airlines
Sat 4/255:05 am
GEG
- ORD
1 stop7h 03m
Alaska Airlines
Deal found 2/13![Alaska Airlines logo]()
$262
This American Airlines deal was found by Cheapflights users on 2/10. 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 3/209:54 am
ORD
- JAC
Nonstop3h 24m
American Airlines
Wed 3/251:44 pm
JAC
- ORD
Nonstop3h 13m
American Airlines
Deal found 2/10![American Airlines logo]()
$325
This United Airlines deal was found by Cheapflights users on 2/10. 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 8/85:00 am
ORD
- IDA
1 stop5h 55m
United Airlines
Sat 8/154:15 pm
IDA
- ORD
1 stop6h 04m
United Airlines
Deal found 2/10![United Airlines logo]()
$269
This Delta deal was found by Cheapflights users on 2/10. 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 4/189:46 am
MDW
- GEG
1 stop5h 17m
Delta
Tue 4/217:38 pm
GEG
- MDW
2 stops11h 09m
Delta
Deal found 2/10![Delta logo]()
$230
This Alaska Airlines deal was found by Cheapflights users on 2/12. 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 5/26:00 am
ORD
- GEG
1 stop9h 23m
Alaska Airlines
Tue 5/55:00 am
GEG
- ORD
2 stops12h 03m
Alaska Airlines
Deal found 2/12![Alaska Airlines logo]()
$264
This United Airlines deal was found by Cheapflights users on 2/13. 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 3/252:50 pm
STL
- GEG
1 stop8h 28m
United Airlines
Sat 4/181:46 pm
GEG
- STL
1 stop5h 08m
United Airlines
Deal found 2/13![United Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 2/10. 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 4/222:09 pm
ORD
- BOI
2 stops11h 08m
Delta
Sat 4/256:00 am
BOI
- ORD
2 stops8h 10m
Delta
Deal found 2/10![Delta logo]()
$231
This American Airlines deal was found by Cheapflights users on 2/10. 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 4/176:04 am
ORD
- IDA
1 stop8h 09m
American Airlines
Wed 4/221:43 pm
IDA
- ORD
1 stop8h 02m
American Airlines
Deal found 2/10![American Airlines logo]()
$341
This Expedia deal was found by Cheapflights users on 2/10. 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 4/148:00 am
ORD
- IDA
1 stop9h 19m
Alaska Airlines
Tue 4/214:59 pm
IDA
- ORD
1 stop12h 41m
Alaska Airlines
Deal found 2/10![Alaska Airlines logo]()
$269
This Alaska Airlines deal was found by Cheapflights users on 2/13. 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
- BOI
1 stop14h 39m
Alaska Airlines
Mon 3/168:27 pm
BOI
- ORD
1 stop16h 44m
Alaska Airlines
Deal found 2/13![Alaska Airlines logo]()
$271
This Delta deal was found by Cheapflights users on 2/11. 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 4/107:15 am
STL
- JAC
1 stop5h 55m
Delta
Sun 4/125:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/11![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 2/12. 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 3/228:55 am
ORD
- JAC
Nonstop3h 29m
United Airlines
Tue 3/314:15 pm
JAC
- ORD
1 stop7h 15m
United Airlines
Deal found 2/12![United Airlines logo]()
$320
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated February 13, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated February 13, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 2/10. 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 2/254:51 pm
STL
- BOI
1 stop20h 00m
Frontier
Sun 3/111:56 am
BOI
- STL
1 stop24h 13m
Frontier
Deal found 2/10![Frontier logo]()
$222
This Expedia deal was found by Cheapflights users on 2/9. 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.
Mon 3/25:29 pm
ORD
- BOI
1 stop7h 30m
Alaska Airlines
Wed 3/46:00 pm
BOI
- ORD
1 stop17h 01m
Alaska Airlines
Deal found 2/9![Alaska Airlines logo]()
$229
This American Airlines deal was found by Cheapflights users on 2/9. 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 3/49:45 am
ORD
- GEG
Nonstop3h 59m
American Airlines
Wed 3/1112:25 pm
GEG
- ORD
Nonstop3h 43m
American Airlines
Deal found 2/9![American Airlines logo]()
$226
This Trip.com deal was found by Cheapflights users on 2/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/63:07 pm
ORD
- BOI
1 stop9h 23m
Hawaiian Airlines
Tue 3/108:30 am
BOI
- ORD
1 stop7h 03m
Hawaiian Airlines
Deal found 2/12![Hawaiian Airlines logo]()
$235
This Delta deal was found by Cheapflights users on 2/10. 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 3/97:10 pm
ORD
- BOI
1 stop5h 49m
Delta
Mon 3/167:30 pm
BOI
- ORD
2 stops12h 10m
Delta
Deal found 2/10![Delta logo]()
$226
This United Airlines deal was found by Cheapflights users on 2/9. 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 3/108:55 am
ORD
- BOI
Nonstop4h 18m
United Airlines
Thu 3/192:40 pm
BOI
- ORD
1 stop8h 12m
United Airlines
Deal found 2/9![United Airlines logo]()
$230
This Alaska Airlines deal was found by Cheapflights users on 2/12. 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 3/103:54 pm
ORD
- GEG
1 stop7h 43m
Alaska Airlines
Tue 3/178:29 pm
GEG
- ORD
1 stop8h 10m
Alaska Airlines
Deal found 2/12![Alaska Airlines logo]()
$236
This Alaska Airlines deal was found by Cheapflights users on 2/13. 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 3/123:07 pm
ORD
- JAC
1 stop22h 17m
Alaska Airlines
Sun 3/1511:48 am
JAC
- ORD
1 stop11h 11m
Alaska Airlines
Deal found 2/13![Alaska Airlines logo]()
$233
This Delta deal was found by Cheapflights users on 2/10. 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 3/147:25 am
ORD
- BOI
1 stop9h 35m
Delta
Tue 3/175:30 am
BOI
- ORD
1 stop5h 05m
Delta
Deal found 2/10![Delta logo]()
$221
This Delta deal was found by Cheapflights users on 2/10. 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 3/197:25 am
ORD
- GEG
1 stop7h 35m
Delta
Mon 3/233:25 pm
GEG
- ORD
1 stop6h 27m
Delta
Deal found 2/10![Delta logo]()
$225
This Delta deal was found by Cheapflights users on 2/10. 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 3/302:05 pm
MDW
- BOI
1 stop8h 04m
Delta
Tue 4/75:30 am
BOI
- MDW
1 stop6h 55m
Delta
Deal found 2/10![Delta logo]()
$221
This Trip.com deal was found by Cheapflights users on 2/13. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/304:13 pm
ORD
- BOI
1 stop8h 34m
Multiple Airlines
Mon 4/68:28 pm
BOI
- ORD
1 stop9h 11m
Multiple Airlines
Deal found 2/13![Multiple Airlines logo]()
$234
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 13, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated February 13, 2026.
This United Airlines deal was found by Cheapflights users on 2/9. 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 3/118:55 am
ORD
- BOI
Nonstop4h 18m
United Airlines
Deal found 2/9![United Airlines logo]()
$96
This United Airlines deal was found by Cheapflights users on 2/9. 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 3/97:40 pm
ORD
- GEG
Nonstop4h 19m
United Airlines
Deal found 2/9![United Airlines logo]()
$98
This Southwest deal was found by Cheapflights users on 2/10. 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 4/156:10 am
MDW
- BOI
1 stop8h 10m
Southwest
Deal found 2/10![Southwest logo]()
$106
This Southwest deal was found by Cheapflights users on 2/10. 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 4/156:15 am
ORD
- BOI
1 stop7h 15m
Southwest
Deal found 2/10![Southwest logo]()
$106
This Kiwi.com deal was found by Cheapflights users on 2/12. 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 3/1111:25 am
MDW
- BOI
2 stops24h 55m
Frontier
Deal found 2/12![Frontier logo]()
$107
This CheapOair deal was found by Cheapflights users on 2/12. 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.
Sat 4/115:53 pm
ORD
- BOI
1 stop18h 15m
Frontier
Deal found 2/12![Frontier logo]()
$107
This Southwest deal was found by Cheapflights users on 2/9. 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.
Mon 3/95:40 am
MDW
- GEG
1 stop6h 15m
Southwest
Deal found 2/9![Southwest logo]()
$108
This Trip.com deal was found by Cheapflights users on 2/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/113:52 pm
ORD
- BOI
1 stop8h 10m
Alaska Airlines
Deal found 2/10![Alaska Airlines logo]()
$109
This Delta deal was found by Cheapflights users on 2/10. 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 3/92:05 pm
MDW
- BOI
1 stop8h 04m
Delta
Deal found 2/10![Delta logo]()
$111
This Delta deal was found by Cheapflights users on 2/9. 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 3/117:25 am
ORD
- BOI
1 stop9h 35m
Delta
Deal found 2/9![Delta logo]()
$111
This Delta deal was found by Cheapflights users on 2/9. 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 3/107:25 am
ORD
- GEG
1 stop9h 19m
Delta
Deal found 2/9![Delta logo]()
$113
This Alaska Airlines deal was found by Cheapflights users on 2/13. 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 3/103:54 pm
ORD
- BOI
1 stop7h 46m
Alaska Airlines
Deal found 2/13![Alaska Airlines logo]()
$115
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 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $201 (CheapOair) |
One-way from | $96 (United 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 13, 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
ChicagoBoise
MDW - BOI
MDWBOI
Chicago Midway
Wed 4/1
9:30 am-2:05 pm
1 stop5h 35m
Boise Air Term. Gowen Fld
Tue 4/7
5:30 am-1:25 pm
1 stop6h 55m
$221
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Wed 4/1
2:20 pm-9:01 pm
1 stop7h 41m
Boise Air Term. Gowen Fld
Tue 4/7
5:30 am-11:35 am
1 stop5h 05m
$221
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Sat 3/14
7:25 am-4:00 pm
1 stop9h 35m
Boise Air Term. Gowen Fld
Sat 3/21
4:40 pm-11:52 pm
1 stop6h 12m
$221
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Thu 3/19
7:25 am-1:00 pm
1 stop7h 35m
Spokane
Mon 3/23
3:25 pm-11:52 pm
1 stop6h 27m
$225
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Fri 4/3
1:57 pm-11:59 pm
2 stops11h 02m
Boise Air Term. Gowen Fld
Tue 4/7
11:30 pm-8:30 am
1 stop8h 00m
$226
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Tue 3/10
8:55 am-12:13 pm
Nonstop4h 18m
Boise Air Term. Gowen Fld
Thu 3/19
2:40 pm-11:52 pm
1 stop8h 12m
$230
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Sat 4/18
9:46 am-1:03 pm
1 stop5h 17m
Spokane
Tue 4/21
7:38 pm-8:47 am
2 stops11h 09m
$230
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Wed 4/22
2:09 pm-12:17 am
2 stops11h 08m
Boise Air Term. Gowen Fld
Sat 4/25
6:00 am-3:10 pm
2 stops8h 10m
$231
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Thu 3/12
3:07 pm-11:59 pm
1 stop10h 52m
Spokane
Wed 3/18
7:43 pm-6:39 am
1 stop8h 56m
$242
ChicagoBoise
MDW - BOI
MDWBOI
Chicago Midway
Wed 4/1
5:10 pm-12:30 am
1 stop8h 20m
Boise Air Term. Gowen Fld
Tue 4/7
3:15 pm-9:30 pm
1 stop5h 15m
$253
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.
MDW-BOI
ORD-BOI
STL-BOI
ORD-GEG
ORD-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
MDW-BOI
ORD-BOI
STL-BOI
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 13, 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 13, 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 13, 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
Boarding
8.1
Crew
8.5
Entertainment
7.0
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Food
7.1
Comfort
7.8
Boarding
8.1
Crew
8.5
Entertainment
7.0
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Food
7.1
Comfort
7.8
Boarding
8.1
Crew
8.5
Entertainment
7.0
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Food
7.1
Comfort
7.8
Boarding
8.1
Crew
8.5
Entertainment
7.0
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Food
7.1
Comfort
7.8
Boarding
8.1
Crew
8.5
Entertainment
7.0
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Food
7.1
Comfort
7.8
Boarding
8.1
Crew
8.5
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 13, 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 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$174 | Average$327 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$237 | Average$439 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$248 | Average$461 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$254 | Average$339 | FlexibilityNo cancel fee | On-time63% |