$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 4/4. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Apr 10 — Apr 171
Round-trip
1 adult, Economy
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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 March 11, 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 March 11, 2026.
This American Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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
Sat 4/181:29 pm
BOI
- ORD
Nonstop3h 47m
American Airlines
Deal found 3/8![American Airlines logo]()
$222
This American Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 8/2210:27 am
ORD
- GEG
Nonstop3h 49m
American Airlines
Sat 8/291:19 pm
GEG
- ORD
Nonstop3h 39m
American Airlines
Deal found 3/7![American Airlines logo]()
$237
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 4/112:05 pm
MDW
- BOI
1 stop8h 04m
Delta
Sat 4/185:34 am
BOI
- MDW
1 stop6h 58m
Delta
Deal found 3/8![Delta logo]()
$241
This American Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 3/7![American Airlines logo]()
$245
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 stop9h 38m
Delta
Sat 4/253:44 pm
BOI
- ORD
1 stop7h 14m
Delta
Deal found 3/8![Delta logo]()
$248
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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
- GEG
1 stop8h 11m
Delta
Tue 5/51:07 pm
GEG
- ORD
1 stop8h 51m
Delta
Deal found 3/8![Delta logo]()
$248
This Alaska Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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
- BOI
1 stop8h 52m
Alaska Airlines
Tue 4/287:43 am
BOI
- ORD
1 stop10h 20m
Alaska Airlines
Deal found 3/7![Alaska Airlines logo]()
$249
This CheapOair deal was found by Cheapflights users on 3/9. 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 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 3/9![Frontier logo]()
$251
This American Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 5/210:30 am
ORD
- GEG
Nonstop4h 02m
American Airlines
Tue 5/51:22 pm
GEG
- ORD
Nonstop3h 57m
American Airlines
Deal found 3/8![American Airlines logo]()
$251
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 5/27:15 am
ORD
- BOI
1 stop9h 59m
Delta
Tue 5/57:24 am
BOI
- ORD
2 stops9h 40m
Delta
Deal found 3/8![Delta logo]()
$253
This Alaska Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 4/285:52 pm
ORD
- GEG
1 stop7h 19m
Alaska Airlines
Sat 5/27:41 pm
GEG
- ORD
1 stop8h 59m
Alaska Airlines
Deal found 3/8![Alaska Airlines logo]()
$255
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 8/2212:40 pm
ORD
- GEG
1 stop8h 07m
Delta
Sat 8/296:30 am
GEG
- ORD
1 stop9h 00m
Delta
Deal found 3/8![Delta logo]()
$257
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 March 11, 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 March 11, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 3/7![Alaska Airlines logo]()
$255
This Delta deal was found by Cheapflights users on 3/10. 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.
Tue 5/52:20 pm
STL
- BOI
2 stops9h 04m
Delta
Sat 5/95:45 am
BOI
- STL
2 stops10h 01m
Delta
Deal found 3/10![Delta logo]()
$260
This Southwest deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 4/226:35 am
STL
- BOI
2 stops7h 45m
Southwest
Wed 4/296:40 am
BOI
- STL
1 stop6h 10m
Southwest
Deal found 3/7![Southwest logo]()
$282
This United Airlines deal was found by Cheapflights users on 3/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/228:40 am
ORD
- BOI
Nonstop3h 52m
United Airlines
Tue 5/2612:38 pm
BOI
- ORD
Nonstop3h 34m
United Airlines
Deal found 3/11![United Airlines logo]()
$299
This American Airlines deal was found by Cheapflights users on 3/10. 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.
Sun 3/299:55 am
ORD
- SUN
Nonstop4h 04m
American Airlines
Sat 4/41:27 pm
SUN
- ORD
Nonstop3h 33m
American Airlines
Deal found 3/10![American Airlines logo]()
$360
This Faresmojo deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Faresmojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/201:19 pm
ORD
- IDA
1 stop5h 56m
JetBlue
Tue 3/241:10 pm
IDA
- ORD
1 stop7h 24m
JetBlue
Deal found 3/6![JetBlue logo]()
$419
This Alaska Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 4/285:52 pm
ORD
- GEG
1 stop7h 19m
Alaska Airlines
Sat 5/27:41 pm
GEG
- ORD
1 stop8h 59m
Alaska Airlines
Deal found 3/8![Alaska Airlines logo]()
$255
This Delta deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 4/177:15 am
ORD
- GEG
1 stop9h 34m
Delta
Sun 4/191:07 pm
GEG
- ORD
1 stop8h 51m
Delta
Deal found 3/7![Delta logo]()
$265
This Southwest deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 4/176:15 pm
ORD
- BOI
1 stop6h 15m
Southwest
Mon 4/2012:05 pm
BOI
- ORD
2 stops10h 50m
Southwest
Deal found 3/8![Southwest logo]()
$294
This Delta deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 5/86:20 pm
ORD
- GEG
1 stop6h 31m
Delta
Tue 5/125:00 am
GEG
- ORD
2 stops11h 50m
Delta
Deal found 3/7![Delta logo]()
$270
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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 6/2910:54 am
ORD
- JAC
1 stop7h 59m
United Airlines
Wed 7/17:30 am
JAC
- ORD
Nonstop3h 10m
United Airlines
Deal found 3/6![United Airlines logo]()
$309
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/77:00 am
STL
- BOI
1 stop9h 29m
Alaska Airlines
Wed 4/82:22 pm
BOI
- STL
1 stop8h 37m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 5/164:45 pm
MDW
- GEG
1 stop7h 30m
Southwest
Tue 5/192:25 pm
GEG
- MDW
1 stop6h 55m
Southwest
Deal found 3/7![Southwest logo]()
$295
This Delta deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 5/27:15 am
ORD
- GEG
1 stop7h 12m
Delta
Tue 5/57:38 pm
GEG
- ORD
2 stops10h 23m
Delta
Deal found 3/7![Delta logo]()
$270
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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 6/2912:56 pm
ORD
- JAC
1 stop5h 57m
United Airlines
Thu 7/24:23 pm
JAC
- ORD
1 stop7h 21m
United Airlines
Deal found 3/6![United Airlines logo]()
$319
This Alaska Airlines deal was found by Cheapflights users on 3/10. 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.
Sat 4/116:00 am
ORD
- BOI
1 stop8h 58m
Alaska Airlines
Tue 4/142:22 pm
BOI
- ORD
1 stop8h 37m
Alaska Airlines
Deal found 3/10![Alaska Airlines logo]()
$302
This Southwest deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 5/105:10 am
MDW
- GEG
1 stop7h 25m
Southwest
Tue 5/1210:55 am
GEG
- MDW
2 stops9h 05m
Southwest
Deal found 3/8![Southwest logo]()
$307
This United Airlines deal was found by Cheapflights users on 3/10. 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.
Mon 7/64:21 pm
ORD
- JAC
Nonstop3h 21m
United Airlines
Thu 7/94:23 pm
JAC
- ORD
1 stop5h 56m
United Airlines
Deal found 3/10![United Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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 5/25:15 am
ORD
- BOI
2 stops13h 06m
Delta
Tue 5/57:24 am
BOI
- ORD
2 stops9h 40m
Delta
Deal found 3/6![Delta logo]()
$300
This Southwest deal was found by Cheapflights users on 3/9. 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.
Wed 5/136:30 am
MDW
- GEG
2 stops9h 15m
Southwest
Sun 5/172:55 pm
GEG
- MDW
1 stop9h 00m
Southwest
Deal found 3/9![Southwest logo]()
$307
This American Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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 4/175:00 am
ORD
- IDA
1 stop9h 13m
American Airlines
Wed 4/221:43 pm
IDA
- ORD
1 stop8h 02m
American Airlines
Deal found 3/6![American Airlines logo]()
$416
This Alaska Airlines deal was found by Cheapflights users on 3/10. 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.
Sat 5/165:33 pm
STL
- BOI
1 stop7h 25m
Alaska Airlines
Wed 5/209:00 am
BOI
- STL
1 stop6h 37m
Alaska Airlines
Deal found 3/10![Alaska Airlines logo]()
$313
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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 3/278:42 am
ORD
- SUN
Nonstop4h 11m
United Airlines
Sat 4/412:25 pm
SUN
- ORD
Nonstop3h 38m
United Airlines
Deal found 3/6![United Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 5/206:20 pm
ORD
- BOI
1 stop6h 35m
Delta
Mon 5/2511:39 pm
BOI
- ORD
1 stop8h 00m
Delta
Deal found 3/8![Delta logo]()
$302
This Southwest deal was found by Cheapflights users on 3/10. 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 4/810:10 am
MDW
- BOI
1 stop6h 15m
Southwest
Wed 4/152:00 pm
BOI
- MDW
1 stop7h 00m
Southwest
Deal found 3/10![Southwest logo]()
$309
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/207:20 am
ORD
- GEG
1 stop6h 28m
Alaska Airlines
Thu 6/257:57 pm
GEG
- ORD
1 stop8h 23m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 5/231:44 pm
ORD
- BOI
2 stops11h 02m
Delta
Mon 5/2511:39 pm
BOI
- ORD
1 stop8h 00m
Delta
Deal found 3/7![Delta logo]()
$307
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 6/15:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Tue 6/95:54 pm
IDA
- ORD
1 stop5h 50m
United Airlines
Deal found 3/8![United Airlines logo]()
$339
This Southwest deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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 3/307:30 pm
STL
- BOI
1 stop7h 25m
Southwest
Tue 3/314:30 pm
BOI
- STL
1 stop5h 50m
Southwest
Deal found 3/6![Southwest logo]()
$312
This Delta deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 4/107:10 pm
ORD
- GEG
1 stop6h 38m
Delta
Sun 4/191:07 pm
GEG
- ORD
1 stop8h 51m
Delta
Deal found 3/7![Delta logo]()
$307
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated March 11, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated March 11, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 4/45:00 am
ORD
- BOI
1 stop8h 12m
American Airlines
Sat 4/111:29 pm
BOI
- ORD
Nonstop3h 47m
American Airlines
Deal found 3/7![American Airlines logo]()
$264
This CheapOair deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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 3/6![Frontier logo]()
$251
This American Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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
Sat 4/181:29 pm
BOI
- ORD
Nonstop3h 47m
American Airlines
Deal found 3/8![American Airlines logo]()
$222
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 4/112:05 pm
MDW
- BOI
1 stop8h 04m
Delta
Sat 4/185:34 am
BOI
- MDW
1 stop6h 58m
Delta
Deal found 3/8![Delta logo]()
$241
This Trip.com deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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.
Tue 4/213:50 pm
STL
- BOI
1 stop9h 06m
Alaska Airlines
Tue 4/284:38 pm
BOI
- STL
1 stop6h 21m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$258
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 stop9h 38m
Delta
Sat 4/253:44 pm
BOI
- ORD
1 stop7h 14m
Delta
Deal found 3/8![Delta logo]()
$248
This Alaska Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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
- BOI
1 stop7h 35m
Alaska Airlines
Mon 4/272:57 pm
BOI
- ORD
1 stop8h 02m
Alaska Airlines
Deal found 3/8![Alaska Airlines logo]()
$249
This Trip.com deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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.
Wed 4/227:00 am
STL
- BOI
1 stop9h 33m
Alaska Airlines
Wed 4/292:57 pm
BOI
- STL
1 stop8h 02m
Alaska Airlines
Deal found 3/7![Alaska Airlines logo]()
$261
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:00 am
ORD
- BOI
1 stop7h 35m
Alaska Airlines
Wed 4/222:57 pm
BOI
- ORD
1 stop8h 02m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$263
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 4/229:29 am
MDW
- BOI
1 stop5h 57m
Delta
Sat 4/252:18 pm
BOI
- MDW
1 stop7h 10m
Delta
Deal found 3/8![Delta logo]()
$265
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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 Alaska Airlines 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 5/22:45 pm
GEG
- ORD
1 stop7h 14m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$262
This Alaska Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 4/285:52 pm
ORD
- GEG
1 stop7h 19m
Alaska Airlines
Sat 5/27:41 pm
GEG
- ORD
1 stop8h 59m
Alaska Airlines
Deal found 3/8![Alaska Airlines logo]()
$255
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 March 11, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated March 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 4/45:53 pm
ORD
- BOI
1 stop18h 15m
Frontier
Deal found 3/8![Frontier logo]()
$104
This CheapOair deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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
Deal found 3/8![Frontier logo]()
$107
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 Kiwi.com 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 3/10![Frontier logo]()
$115
This Delta deal was found by Cheapflights users on 3/9. 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.
Sat 4/112:05 pm
MDW
- BOI
1 stop8h 04m
Delta
Deal found 3/9![Delta logo]()
$121
This Delta deal was found by Cheapflights users on 3/9. 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.
Sat 5/95:41 pm
ORD
- BOI
1 stop7h 05m
Delta
Deal found 3/9![Delta logo]()
$121
This Delta deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 5/95:41 pm
ORD
- GEG
1 stop7h 25m
Delta
Deal found 3/8![Delta logo]()
$124
This Delta deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 5/99:23 am
MDW
- GEG
1 stop5h 48m
Delta
Deal found 3/7![Delta logo]()
$124
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/58:00 am
ORD
- BOI
1 stop6h 52m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$125
This Delta deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 4/49:35 am
MDW
- BOI
2 stops8h 43m
Delta
Deal found 3/7![Delta logo]()
$126
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/53:52 pm
ORD
- GEG
1 stop8h 28m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 4/152:15 pm
MDW
- BOI
2 stops21h 53m
Frontier
Deal found 3/7![Frontier logo]()
$129
This Delta deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 4/49:35 am
ORD
- GEG
1 stop5h 35m
Delta
Deal found 3/7![Delta logo]()
$129
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 March 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $222 (American Airlines) |
One-way from | $104 (Kiwi.com) |
Popular in | June |
Cheapest in | February |
Average price | $394 |
Good round-trip deal | $281 or less |
Good one-way deal | $253 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 March 11, 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
Cheapest round-trip
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 8/22
7:00 am-11:42 am
1 stop6h 42m
Spokane
Sat 8/29
12:36 pm-11:41 pm
1 stop9h 05m
$255
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Tue 4/28
5:52 pm-11:11 pm
1 stop7h 19m
Spokane
Sat 5/2
7:41 pm-6:40 am
1 stop8h 59m
$255
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Tue 5/5
2:20 pm-10:24 pm
2 stops9h 04m
Boise Air Term. Gowen Fld
Sat 5/9
5:45 am-4:46 pm
2 stops10h 01m
$260
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Fri 4/17
7:15 am-2:49 pm
1 stop9h 34m
Spokane
Sun 4/19
1:07 pm-11:58 pm
1 stop8h 51m
$265
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Fri 5/8
6:20 pm-10:51 pm
1 stop6h 31m
Spokane
Tue 5/12
5:00 am-6:50 pm
2 stops11h 50m
$270
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 5/2
7:15 am-12:27 pm
1 stop7h 12m
Spokane
Tue 5/5
7:38 pm-8:01 am
2 stops10h 23m
$270
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Wed 4/22
6:35 am-1:20 pm
2 stops7h 45m
Boise Air Term. Gowen Fld
Wed 4/29
6:40 am-1:50 pm
1 stop6h 10m
$282
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Fri 4/17
6:15 pm-11:30 pm
1 stop6h 15m
Boise Air Term. Gowen Fld
Mon 4/20
12:05 pm-11:55 pm
2 stops10h 50m
$294
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Tue 4/7
7:00 am-3:29 pm
1 stop9h 29m
Boise Air Term. Gowen Fld
Wed 4/8
2:22 pm-11:59 pm
1 stop8h 37m
$295
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Sat 5/16
4:45 pm-10:15 pm
1 stop7h 30m
Spokane
Tue 5/19
2:25 pm-11:20 pm
1 stop6h 55m
$295
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
STL-BOI
ORD-BOI
ORD-SUN
ORD-IDA
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
STL-BOI
ORD-BOI
ORD-SUN
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 $156). Flying from Illinois to Idaho in March is currently the most expensive (average of $371). 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 March 11, 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 March 11, 2026.
The most flights from USIL to USID are scheduled on a Monday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (6 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 March 11, 2026.
Read reviews from past customers who have flown Alaska Airlines,Southwest, andDelta from Illinois to Idaho. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Food
7.1
Entertainment
7.0
Comfort
7.8
Crew
8.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Overall
8.0
Food
7.1
Entertainment
7.0
Comfort
7.8
Crew
8.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Overall
8.0
Food
7.1
Entertainment
7.0
Comfort
7.8
Crew
8.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Overall
8.0
Food
7.1
Entertainment
7.0
Comfort
7.8
Crew
8.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Overall
8.0
Food
7.1
Entertainment
7.0
Comfort
7.8
Crew
8.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Overall
8.0
Food
7.1
Entertainment
7.0
Comfort
7.8
Crew
8.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
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.
Browse thousands of different options on Cheapflights for your next trip
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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 March 11, 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 March 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$174 | Average$335 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$237 | Average$450 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$248 | Average$482 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$254 | Average$368 | FlexibilityNo cancel fee | On-time63% |