$107+ 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 4/1. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Apr 2 — Apr 91
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 March 3, 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 3, 2026.
This CheapOair deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 2/27![Frontier logo]()
$201
This Trip.com deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 4/136:00 am
ORD
- BOI
1 stop7h 22m
Hawaiian Airlines
Mon 4/208:28 pm
BOI
- ORD
1 stop9h 11m
Hawaiian Airlines
Deal found 2/27![Hawaiian Airlines logo]()
$212
This Frontier deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/45:53 pm
ORD
- GEG
1 stop18h 28m
Frontier
Sun 4/1211:06 am
GEG
- ORD
1 stop24h 13m
Frontier
Deal found 3/1![Frontier logo]()
$221
This Alaska Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 stop7h 35m
Alaska Airlines
Thu 4/232:57 pm
BOI
- ORD
1 stop8h 02m
Alaska Airlines
Deal found 3/1![Alaska Airlines logo]()
$223
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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
Tue 4/2811:35 pm
BOI
- MDW
1 stop9h 21m
Delta
Deal found 2/27![Delta logo]()
$229
This Alaska Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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
Mon 4/276:08 pm
BOI
- ORD
1 stop11h 32m
Alaska Airlines
Deal found 3/2![Alaska Airlines logo]()
$229
This Southwest deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” 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 4/183:05 pm
ORD
- GEG
1 stop8h 10m
Southwest
Sat 4/255:45 am
GEG
- ORD
1 stop6h 45m
Southwest
Deal found 2/28![Southwest logo]()
$230
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.
Wed 4/222:09 pm
ORD
- BOI
2 stops9h 15m
Delta
Sun 4/265:40 am
BOI
- ORD
1 stop6h 43m
Delta
Deal found 2/26![Delta logo]()
$234
This Delta deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” 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 18m
Delta
Sat 4/256:00 am
GEG
- MDW
1 stop5h 32m
Delta
Deal found 2/28![Delta logo]()
$235
This Alaska Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:00 am
ORD
- GEG
1 stop8h 30m
Alaska Airlines
Sat 8/2912:36 pm
GEG
- ORD
1 stop9h 05m
Alaska Airlines
Deal found 3/2![Alaska Airlines logo]()
$235
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.
Tue 4/76:30 am
MDW
- GEG
1 stop5h 45m
Southwest
Mon 4/135:35 pm
GEG
- MDW
1 stop9h 25m
Southwest
Deal found 2/26![Southwest logo]()
$238
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 stops9h 15m
Delta
Tue 4/287:24 am
BOI
- ORD
2 stops9h 40m
Delta
Deal found 2/27![Delta logo]()
$239
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 3, 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 3, 2026.
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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
Tue 4/286:00 am
BOI
- MDW
2 stops6h 32m
Delta
Deal found 2/27![Delta logo]()
$234
This Alaska Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:00 am
ORD
- GEG
1 stop8h 30m
Alaska Airlines
Sat 8/2912:36 pm
GEG
- ORD
1 stop9h 05m
Alaska Airlines
Deal found 2/27![Alaska Airlines logo]()
$235
This Southwest deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” 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 4/244:35 pm
MDW
- BOI
2 stops9h 25m
Southwest
Sun 4/269:10 pm
BOI
- MDW
1 stop7h 35m
Southwest
Deal found 2/28![Southwest logo]()
$274
This United Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/187:00 am
ORD
- GEG
1 stop7h 40m
United Airlines
Sat 4/254:01 pm
GEG
- ORD
1 stop6h 28m
United Airlines
Deal found 3/2![United Airlines logo]()
$275
This American Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/149:51 am
ORD
- SUN
Nonstop4h 04m
American Airlines
Wed 3/181:27 pm
SUN
- ORD
Nonstop3h 33m
American Airlines
Deal found 2/27![American Airlines logo]()
$406
This Delta deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” 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 5/910:15 am
ORD
- BOI
2 stops8h 35m
Delta
Sun 5/108:56 am
BOI
- ORD
1 stop6h 53m
Delta
Deal found 2/28![Delta logo]()
$234
This Delta deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” 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 4/87:20 am
ORD
- BOI
2 stops12h 23m
Delta
Sun 4/1210:25 am
BOI
- ORD
1 stop6h 40m
Delta
Deal found 2/28![Delta logo]()
$234
This Southwest deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/226:10 am
MDW
- BOI
2 stops9h 30m
Southwest
Sun 4/269:10 pm
BOI
- MDW
1 stop7h 35m
Southwest
Deal found 3/2![Southwest logo]()
$274
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.
Wed 4/222:09 pm
ORD
- BOI
2 stops9h 15m
Delta
Tue 4/287:24 am
BOI
- ORD
1 stop8h 15m
Delta
Deal found 2/26![Delta logo]()
$234
This United Airlines deal was found by Cheapflights users on 3/3. Clicking the “Pick Dates” 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 4/67:00 am
ORD
- SUN
1 stop7h 35m
United Airlines
Tue 4/142:24 pm
SUN
- ORD
1 stop5h 56m
United Airlines
Deal found 3/3![United Airlines logo]()
$301
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.
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 2/26![Alaska Airlines logo]()
$303
This Delta deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” 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 6/66:57 pm
ORD
- GEG
1 stop7h 01m
Delta
Sat 6/139:10 am
GEG
- ORD
1 stop6h 12m
Delta
Deal found 2/28![Delta logo]()
$235
This Southwest deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 5/110:10 am
MDW
- GEG
1 stop8h 50m
Southwest
Mon 5/45:35 pm
GEG
- MDW
1 stop9h 25m
Southwest
Deal found 2/27![Southwest logo]()
$289
This United Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 4/222:05 pm
ORD
- JAC
1 stop7h 48m
United Airlines
Wed 4/292:35 pm
JAC
- ORD
1 stop5h 45m
United Airlines
Deal found 2/27![United Airlines logo]()
$304
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.
Wed 4/87:10 pm
ORD
- GEG
1 stop6h 38m
Delta
Mon 4/1310:40 pm
GEG
- ORD
1 stop9h 29m
Delta
Deal found 2/26![Delta logo]()
$242
This Southwest deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” 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 5/26:15 am
ORD
- BOI
2 stops11h 00m
Southwest
Tue 5/51:05 pm
BOI
- ORD
2 stops8h 50m
Southwest
Deal found 2/28![Southwest logo]()
$299
This United Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 6/175:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Sun 6/212:30 pm
IDA
- ORD
1 stop7h 49m
United Airlines
Deal found 2/27![United Airlines logo]()
$305
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 8/221:35 pm
ORD
- GEG
2 stops12h 09m
Delta
Sat 8/2910:05 am
GEG
- ORD
2 stops11h 52m
Delta
Deal found 2/27![Delta logo]()
$245
This Alaska Airlines deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” 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 stop9h 29m
Alaska Airlines
Mon 4/277:20 pm
BOI
- STL
1 stop27h 39m
Alaska Airlines
Deal found 2/28![Alaska Airlines logo]()
$365
This Southwest deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 4/15:55 am
MDW
- BOI
1 stop5h 35m
Southwest
Tue 4/73:15 pm
BOI
- MDW
1 stop5h 15m
Southwest
Deal found 3/1![Southwest logo]()
$312
This United Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 5/237:40 am
ORD
- BOI
1 stop10h 04m
United Airlines
Mon 5/2512:38 pm
BOI
- ORD
Nonstop3h 34m
United Airlines
Deal found 2/27![United Airlines logo]()
$314
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 8/113:50 pm
ORD
- GEG
2 stops9h 45m
Delta
Thu 8/2010:45 pm
GEG
- ORD
1 stop7h 49m
Delta
Deal found 2/27![Delta logo]()
$247
This Alaska Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 5/205:33 pm
STL
- BOI
1 stop24h 40m
Alaska Airlines
Thu 5/289:00 am
BOI
- STL
1 stop6h 37m
Alaska Airlines
Deal found 3/2![Alaska Airlines logo]()
$387
This Southwest deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 5/294:05 pm
MDW
- GEG
2 stops8h 15m
Southwest
Mon 6/15:35 pm
GEG
- MDW
1 stop9h 25m
Southwest
Deal found 3/2![Southwest logo]()
$328
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/25:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Sat 8/85:54 pm
IDA
- ORD
1 stop5h 50m
United Airlines
Deal found 2/26![United Airlines logo]()
$329
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.
Tue 4/72:05 pm
MDW
- GEG
2 stops11h 58m
Delta
Mon 4/137:38 pm
GEG
- MDW
2 stops11h 09m
Delta
Deal found 2/26![Delta logo]()
$252
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 stop7h 12m
Delta
Sun 4/196:00 am
GEG
- ORD
2 stops10h 52m
Delta
Deal found 2/27![Delta logo]()
$254
This Southwest deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 5/264:00 pm
MDW
- GEG
2 stops9h 25m
Southwest
Tue 6/210:55 am
GEG
- MDW
2 stops9h 05m
Southwest
Deal found 3/1![Southwest logo]()
$340
This United Airlines deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” 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.
Thu 4/28:55 am
ORD
- JAC
Nonstop3h 22m
United Airlines
Sun 4/54:15 pm
JAC
- ORD
1 stop6h 13m
United Airlines
Deal found 2/28![United Airlines logo]()
$341
This Alaska Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 4/26:00 am
ORD
- IDA
1 stop11h 19m
Alaska Airlines
Tue 4/76:00 am
IDA
- ORD
1 stop8h 05m
Alaska Airlines
Deal found 2/27![Alaska Airlines logo]()
$414
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated March 3, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated March 3, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/45:53 pm
ORD
- GEG
1 stop18h 28m
Frontier
Sun 4/1211:06 am
GEG
- ORD
1 stop24h 13m
Frontier
Deal found 3/1![Frontier logo]()
$221
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.
Tue 4/76:30 am
MDW
- GEG
1 stop5h 45m
Southwest
Mon 4/135:35 pm
GEG
- MDW
1 stop9h 25m
Southwest
Deal found 2/26![Southwest logo]()
$238
This CheapOair deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 2/27![Frontier logo]()
$201
This Trip.com deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 4/136:00 am
ORD
- BOI
1 stop7h 22m
Hawaiian Airlines
Mon 4/208:28 pm
BOI
- ORD
1 stop9h 11m
Hawaiian Airlines
Deal found 2/27![Hawaiian Airlines logo]()
$212
This Southwest deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” 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 4/183:05 pm
ORD
- GEG
1 stop8h 10m
Southwest
Sat 4/255:45 am
GEG
- ORD
1 stop6h 45m
Southwest
Deal found 2/28![Southwest logo]()
$230
This Delta deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” 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 18m
Delta
Sat 4/256:00 am
GEG
- MDW
1 stop5h 32m
Delta
Deal found 2/28![Delta logo]()
$235
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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
Tue 4/2811:35 pm
BOI
- MDW
1 stop9h 21m
Delta
Deal found 2/27![Delta logo]()
$229
This Alaska Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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
Mon 4/276:08 pm
BOI
- ORD
1 stop11h 32m
Alaska Airlines
Deal found 3/2![Alaska Airlines logo]()
$229
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.
Wed 4/222:09 pm
ORD
- BOI
2 stops9h 15m
Delta
Sun 4/265:40 am
BOI
- ORD
1 stop6h 43m
Delta
Deal found 2/26![Delta logo]()
$234
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 stops9h 15m
Delta
Tue 4/287:24 am
BOI
- ORD
2 stops9h 40m
Delta
Deal found 2/27![Delta logo]()
$239
This Alaska Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 stop7h 35m
Alaska Airlines
Thu 4/232:57 pm
BOI
- ORD
1 stop8h 02m
Alaska Airlines
Deal found 3/1![Alaska Airlines logo]()
$223
This Alaska Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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
- GEG
1 stop6h 38m
Alaska Airlines
Mon 4/277:41 pm
GEG
- ORD
1 stop8h 59m
Alaska Airlines
Deal found 3/2![Alaska Airlines logo]()
$235
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 3, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated March 3, 2026.
This CheapOair deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/13:29 pm
ORD
- BOI
1 stop20h 39m
Frontier
Deal found 3/2![Frontier logo]()
$107
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/298:58 pm
ORD
- GEG
1 stop25h 31m
Multiple Airlines
Deal found 2/26![Multiple Airlines logo]()
$111
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 4/259:46 am
MDW
- BOI
1 stop5h 40m
Delta
Deal found 2/27![Delta logo]()
$115
This Alaska Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/296:00 am
ORD
- BOI
1 stop7h 35m
Alaska Airlines
Deal found 3/2![Alaska Airlines logo]()
$115
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 4/259:46 am
MDW
- GEG
1 stop5h 18m
Delta
Deal found 2/27![Delta logo]()
$118
This Alaska Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/286:00 am
ORD
- GEG
1 stop9h 23m
Alaska Airlines
Deal found 3/2![Alaska Airlines logo]()
$118
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 3/259:30 am
MDW
- GEG
1 stop5h 40m
Delta
Deal found 2/27![Delta logo]()
$119
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 3/245:30 am
ORD
- GEG
1 stop8h 07m
Delta
Deal found 2/27![Delta logo]()
$119
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.
Tue 8/251:05 pm
MDW
- BOI
2 stops11h 51m
Delta
Deal found 2/26![Delta logo]()
$120
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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 5/273:47 pm
ORD
- BOI
2 stops9h 08m
Delta
Deal found 2/27![Delta logo]()
$120
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.
Sat 4/2511:00 am
ORD
- GEG
2 stops12h 02m
Delta
Deal found 2/26![Delta logo]()
$123
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” 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
Deal found 2/27![Delta logo]()
$125
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 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $201 (CheapOair) |
One-way from | $107 (CheapOair) |
Popular in | November |
Cheapest in | October |
Average price | $399 |
Good round-trip deal | $281 or less |
Good one-way deal | $255 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 3, 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
ChicagoBoise
MDW - BOI
MDWBOI
Chicago Midway
Wed 4/22
9:29 am-2:26 pm
1 stop5h 57m
Boise Air Term. Gowen Fld
Tue 4/28
6:00 am-1:32 pm
2 stops6h 32m
$234
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Sat 5/9
10:15 am-5:50 pm
2 stops8h 35m
Boise Air Term. Gowen Fld
Sun 5/10
8:56 am-4:49 pm
1 stop6h 53m
$234
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Wed 4/8
7:20 am-6:43 pm
2 stops12h 23m
Boise Air Term. Gowen Fld
Sun 4/12
10:25 am-6:05 pm
1 stop6h 40m
$234
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Wed 4/22
2:09 pm-10:24 pm
2 stops9h 15m
Boise Air Term. Gowen Fld
Tue 4/28
7:24 am-4:39 pm
1 stop8h 15m
$234
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 8/22
6:00 am-12:30 pm
1 stop8h 30m
Spokane
Sat 8/29
12:36 pm-11:41 pm
1 stop9h 05m
$235
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 6/6
6:57 pm-11:58 pm
1 stop7h 01m
Spokane
Sat 6/13
9:10 am-5:22 pm
1 stop6h 12m
$235
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Wed 4/8
7:10 pm-11:48 pm
1 stop6h 38m
Spokane
Mon 4/13
10:40 pm-10:09 am
1 stop9h 29m
$242
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 8/22
1:35 pm-11:44 pm
2 stops12h 09m
Spokane
Sat 8/29
10:05 am-11:57 pm
2 stops11h 52m
$245
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Tue 8/11
3:50 pm-11:35 pm
2 stops9h 45m
Spokane
Thu 8/20
10:45 pm-8:34 am
1 stop7h 49m
$247
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Tue 4/7
2:05 pm-12:03 am
2 stops11h 58m
Spokane
Mon 4/13
7:38 pm-8:47 am
2 stops11h 09m
$252
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-BOI
ORD-GEG
MDW-BOI
MDW-GEG
STL-BOI
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-BOI
ORD-GEG
MDW-BOI
MDW-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 March 3, 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.
How much does it cost to fly round-trip from Illinois to Idaho?
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 3, 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.
Crew
8.5
Comfort
7.8
Overall
8.0
Entertainment
7.0
Food
7.1
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Comfort
7.8
Overall
8.0
Entertainment
7.0
Food
7.1
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Comfort
7.8
Overall
8.0
Entertainment
7.0
Food
7.1
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Comfort
7.8
Overall
8.0
Entertainment
7.0
Food
7.1
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Comfort
7.8
Overall
8.0
Entertainment
7.0
Food
7.1
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Comfort
7.8
Overall
8.0
Entertainment
7.0
Food
7.1
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Related info for your journey
Find useful and relevant information for your journey from Illinois to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for Illinois to 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 3, 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 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$174 | Average$327 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$237 | Average$446 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$248 | Average$479 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$254 | Average$368 | FlexibilityNo cancel fee | On-time63% |