$80+ 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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Aug 10 — Aug 171
Round-trip
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 July 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 July 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/10. 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.
Thu 9/101:02 pm
ORD
- IDA
1 stop23h 48m
Multiple Airlines
Mon 9/146:21 pm
IDA
- ORD
1 stop10h 21m
Multiple Airlines
Deal found 7/10![Multiple Airlines logo]()
$221
This Southwest deal was found by Cheapflights users on 7/7. 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 9/166:00 pm
MDW
- GEG
1 stop6h 25m
Southwest
Mon 9/216:00 am
GEG
- MDW
Nonstop3h 30m
Southwest
Deal found 7/7![Southwest logo]()
$223
This Southwest deal was found by Cheapflights users on 7/7. 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.
Thu 8/138:50 pm
MDW
- GEG
Nonstop3h 50m
Southwest
Thu 8/206:00 am
GEG
- MDW
Nonstop3h 30m
Southwest
Deal found 7/7![Southwest logo]()
$231
This Delta deal was found by Cheapflights users on 7/8. 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 8/157:00 am
ORD
- GEG
1 stop7h 08m
Delta
Sat 8/2212:36 pm
GEG
- ORD
1 stop9h 21m
Delta
Deal found 7/8![Delta logo]()
$233
This Delta deal was found by Cheapflights users on 7/8. 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 8/156:11 am
MDW
- GEG
1 stop7h 10m
Delta
Sat 8/2212:36 pm
GEG
- MDW
1 stop8h 00m
Delta
Deal found 7/8![Delta logo]()
$233
This Delta deal was found by Cheapflights users on 7/8. 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 8/122:00 pm
ORD
- GEG
2 stops9h 16m
Delta
Sat 8/2212:36 pm
GEG
- ORD
1 stop9h 21m
Delta
Deal found 7/8![Delta logo]()
$238
This Delta deal was found by Cheapflights users on 7/7. 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.
Thu 8/137:25 pm
MDW
- GEG
1 stop5h 44m
Delta
Thu 8/207:54 pm
GEG
- MDW
2 stops10h 45m
Delta
Deal found 7/7![Delta logo]()
$238
This Southwest deal was found by Cheapflights users on 7/9. 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.
Sat 8/154:05 pm
MDW
- GEG
1 stop7h 20m
Southwest
Sat 8/228:00 am
GEG
- MDW
2 stops9h 05m
Southwest
Deal found 7/9![Southwest logo]()
$239
This Southwest deal was found by Cheapflights users on 7/9. 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.
Thu 8/278:50 pm
MDW
- GEG
Nonstop3h 50m
Southwest
Tue 9/84:55 pm
GEG
- MDW
1 stop10h 05m
Southwest
Deal found 7/9![Southwest logo]()
$241
This Delta deal was found by Cheapflights users on 7/8. 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 8/228:28 am
ORD
- GEG
2 stops9h 41m
Delta
Sat 8/297:05 am
GEG
- ORD
2 stops11h 25m
Delta
Deal found 7/8![Delta logo]()
$243
This Delta deal was found by Cheapflights users on 7/10. 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 8/251:51 pm
MDW
- GEG
2 stops11h 35m
Delta
Tue 9/17:54 pm
GEG
- MDW
2 stops10h 45m
Delta
Deal found 7/10![Delta logo]()
$243
This Southwest deal was found by Cheapflights users on 7/10. 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.
Sat 8/222:15 pm
MDW
- GEG
2 stops8h 40m
Southwest
Tue 8/257:30 am
GEG
- MDW
2 stops9h 30m
Southwest
Deal found 7/10![Southwest logo]()
$244
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 July 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 July 11, 2026.
This Delta deal was found by Cheapflights users on 7/10. 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 8/252:36 pm
ORD
- GEG
1 stop8h 57m
Delta
Tue 9/12:05 pm
GEG
- ORD
1 stop5h 42m
Delta
Deal found 7/10![Delta logo]()
$233
This Southwest deal was found by Cheapflights users on 7/8. 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.
Sat 9/55:40 am
MDW
- GEG
1 stop7h 05m
Southwest
Mon 9/1412:20 pm
GEG
- MDW
1 stop9h 25m
Southwest
Deal found 7/8![Southwest logo]()
$251
This Alaska Airlines deal was found by Cheapflights users on 7/10. 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.
Tue 9/296:29 am
STL
- BOI
1 stop7h 06m
Alaska Airlines
Wed 9/306:23 am
BOI
- STL
1 stop6h 58m
Alaska Airlines
Deal found 7/10![Alaska Airlines logo]()
$293
This United Airlines deal was found by Cheapflights users on 7/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1711:25 am
STL
- BOI
2 stops11h 05m
United Airlines
Wed 11/1812:32 pm
BOI
- STL
1 stop7h 41m
United Airlines
Deal found 7/7![United Airlines logo]()
$358
This KAYAK deal was found by Cheapflights users on 7/10. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1411:35 am
ORD
- BOI
Nonstop3h 56m
American Airlines
Fri 9/183:21 pm
BOI
- ORD
Nonstop3h 55m
American Airlines
Deal found 7/10![American Airlines logo]()
$376
This Delta deal was found by Cheapflights users on 7/10. 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 8/257:25 pm
MDW
- GEG
1 stop5h 44m
Delta
Tue 9/17:54 pm
GEG
- MDW
2 stops10h 45m
Delta
Deal found 7/10![Delta logo]()
$238
This Delta deal was found by Cheapflights users on 7/9. 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 8/191:59 pm
ORD
- GEG
2 stops11h 27m
Delta
Wed 8/266:16 am
GEG
- ORD
1 stop9h 24m
Delta
Deal found 7/9![Delta logo]()
$238
This Southwest deal was found by Cheapflights users on 7/9. 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.
Sat 9/58:30 am
STL
- BOI
1 stop7h 00m
Southwest
Sat 9/123:25 pm
BOI
- STL
1 stop5h 55m
Southwest
Deal found 7/9![Southwest logo]()
$263
This Delta deal was found by Cheapflights users on 7/9. 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 8/122:00 pm
ORD
- GEG
2 stops9h 16m
Delta
Sat 8/2212:36 pm
GEG
- ORD
1 stop9h 21m
Delta
Deal found 7/9![Delta logo]()
$238
This Southwest deal was found by Cheapflights users on 7/9. 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.
Thu 8/202:20 pm
STL
- BOI
2 stops10h 35m
Southwest
Tue 8/2512:35 pm
BOI
- STL
2 stops8h 35m
Southwest
Deal found 7/9![Southwest logo]()
$280
This Alaska Airlines deal was found by Cheapflights users on 7/10. 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.
Tue 8/256:00 am
ORD
- IDA
1 stop10h 20m
Alaska Airlines
Tue 9/12:01 pm
IDA
- ORD
1 stop8h 58m
Alaska Airlines
Deal found 7/10![Alaska Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 7/10. 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 8/277:00 am
ORD
- GEG
1 stop7h 08m
Delta
Tue 9/85:10 am
GEG
- ORD
1 stop6h 19m
Delta
Deal found 7/10![Delta logo]()
$251
This Southwest deal was found by Cheapflights users on 7/9. 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.
Thu 8/136:00 am
STL
- BOI
2 stops9h 15m
Southwest
Mon 8/173:50 pm
BOI
- STL
1 stop7h 45m
Southwest
Deal found 7/9![Southwest logo]()
$287
This United Airlines deal was found by Cheapflights users on 7/9. 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 8/38:40 am
ORD
- BOI
Nonstop3h 52m
United Airlines
Thu 8/612:34 pm
BOI
- ORD
Nonstop3h 31m
United Airlines
Deal found 7/9![United Airlines logo]()
$372
This Delta deal was found by Cheapflights users on 7/8. 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.
Tue 8/41:59 pm
ORD
- GEG
2 stops11h 27m
Delta
Tue 8/119:52 am
GEG
- ORD
1 stop6h 27m
Delta
Deal found 7/8![Delta logo]()
$256
This Alaska Airlines deal was found by Cheapflights users on 7/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/48:20 pm
ORD
- BOI
1 stop14h 17m
Alaska Airlines
Tue 8/117:57 am
BOI
- ORD
1 stop10h 00m
Alaska Airlines
Deal found 7/6![Alaska Airlines logo]()
$357
This Delta deal was found by Cheapflights users on 7/8. 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.
Thu 9/245:47 pm
STL
- BOI
1 stop7h 12m
Delta
Tue 9/292:50 pm
BOI
- STL
1 stop7h 26m
Delta
Deal found 7/8![Delta logo]()
$263
This Southwest deal was found by Cheapflights users on 7/10. 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.
Mon 8/248:50 pm
MDW
- GEG
Nonstop3h 50m
Southwest
Mon 8/316:00 am
GEG
- MDW
Nonstop3h 30m
Southwest
Deal found 7/10![Southwest logo]()
$322
This Alaska Airlines deal was found by Cheapflights users on 7/9. 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.
Thu 9/248:30 am
STL
- BOI
2 stops12h 55m
Alaska Airlines
Tue 9/296:23 am
BOI
- STL
2 stops11h 44m
Alaska Airlines
Deal found 7/9![Alaska Airlines logo]()
$374
This United Airlines deal was found by Cheapflights users on 7/9. 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 8/175:00 am
ORD
- IDA
1 stop5h 51m
United Airlines
Mon 8/244:04 pm
IDA
- ORD
1 stop6h 55m
United Airlines
Deal found 7/9![United Airlines logo]()
$414
This Delta deal was found by Cheapflights users on 7/9. 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.
Thu 8/207:45 pm
STL
- BOI
1 stop5h 14m
Delta
Tue 8/256:00 am
BOI
- STL
1 stop6h 38m
Delta
Deal found 7/9![Delta logo]()
$263
This Southwest deal was found by Cheapflights users on 7/8. 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.
Wed 9/234:40 pm
MDW
- GEG
2 stops7h 45m
Southwest
Sun 9/276:45 pm
GEG
- MDW
1 stop9h 00m
Southwest
Deal found 7/8![Southwest logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 7/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/47:20 am
ORD
- GEG
1 stop6h 25m
Alaska Airlines
Tue 8/118:15 am
GEG
- ORD
1 stop8h 42m
Alaska Airlines
Deal found 7/6![Alaska Airlines logo]()
$380
This United Airlines deal was found by Cheapflights users on 7/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:00 am
ORD
- IDA
1 stop5h 53m
United Airlines
Mon 10/54:05 pm
IDA
- ORD
1 stop6h 54m
United Airlines
Deal found 7/7![United Airlines logo]()
$419
This Southwest deal was found by Cheapflights users on 7/7. 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.
Fri 8/213:20 pm
MDW
- BOI
2 stops8h 15m
Southwest
Fri 8/2812:10 pm
BOI
- MDW
Nonstop3h 20m
Southwest
Deal found 7/7![Southwest logo]()
$338
This Delta deal was found by Cheapflights users on 7/10. 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 8/247:48 am
ORD
- GEG
2 stops11h 12m
Delta
Mon 8/317:54 pm
GEG
- ORD
2 stops10h 36m
Delta
Deal found 7/10![Delta logo]()
$280
This United Airlines deal was found by Cheapflights users on 7/10. 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 9/78:55 am
ORD
- JAC
Nonstop3h 18m
United Airlines
Thu 9/104:25 pm
JAC
- ORD
1 stop6h 34m
United Airlines
Deal found 7/10![United Airlines logo]()
$419
This Alaska Airlines deal was found by Cheapflights users on 7/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/253:52 pm
ORD
- IDA
1 stop8h 04m
Alaska Airlines
Mon 9/282:01 pm
IDA
- ORD
1 stop8h 58m
Alaska Airlines
Deal found 7/6![Alaska Airlines logo]()
$389
This Southwest deal was found by Cheapflights users on 7/10. 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.
Thu 8/63:20 pm
MDW
- BOI
2 stops8h 15m
Southwest
Thu 8/1312:10 pm
BOI
- MDW
Nonstop3h 20m
Southwest
Deal found 7/10![Southwest logo]()
$349
This United Airlines deal was found by Cheapflights users on 7/6. 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.
Sun 7/195:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Sat 7/252:30 pm
IDA
- ORD
1 stop7h 19m
United Airlines
Deal found 7/6![United Airlines logo]()
$428
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated July 11, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated July 11, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 7/8. 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 8/122:00 pm
ORD
- GEG
2 stops9h 16m
Delta
Sat 8/2212:36 pm
GEG
- ORD
1 stop9h 21m
Delta
Deal found 7/8![Delta logo]()
$238
This Southwest deal was found by Cheapflights users on 7/7. 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.
Thu 8/138:50 pm
MDW
- GEG
Nonstop3h 50m
Southwest
Thu 8/206:00 am
GEG
- MDW
Nonstop3h 30m
Southwest
Deal found 7/7![Southwest logo]()
$231
This Delta deal was found by Cheapflights users on 7/7. 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.
Thu 8/137:25 pm
MDW
- GEG
1 stop5h 44m
Delta
Thu 8/207:54 pm
GEG
- MDW
2 stops10h 45m
Delta
Deal found 7/7![Delta logo]()
$238
This Delta deal was found by Cheapflights users on 7/8. 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 8/156:11 am
MDW
- GEG
1 stop7h 10m
Delta
Sat 8/2212:36 pm
GEG
- MDW
1 stop8h 00m
Delta
Deal found 7/8![Delta logo]()
$233
This Delta deal was found by Cheapflights users on 7/8. 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 8/157:00 am
ORD
- GEG
1 stop7h 08m
Delta
Sat 8/2212:36 pm
GEG
- ORD
1 stop9h 21m
Delta
Deal found 7/8![Delta logo]()
$233
This Southwest deal was found by Cheapflights users on 7/9. 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.
Sat 8/154:05 pm
MDW
- GEG
1 stop7h 20m
Southwest
Sat 8/228:00 am
GEG
- MDW
2 stops9h 05m
Southwest
Deal found 7/9![Southwest logo]()
$239
This American Airlines deal was found by Cheapflights users on 7/9. 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.
Sat 8/1511:30 am
ORD
- GEG
Nonstop4h 07m
American Airlines
Sat 8/222:27 pm
GEG
- ORD
Nonstop4h 01m
American Airlines
Deal found 7/9![American Airlines logo]()
$250
This Delta deal was found by Cheapflights users on 7/8. 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 8/228:28 am
ORD
- GEG
2 stops9h 41m
Delta
Sat 8/297:05 am
GEG
- ORD
2 stops11h 25m
Delta
Deal found 7/8![Delta logo]()
$243
This Southwest deal was found by Cheapflights users on 7/10. 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.
Sat 8/222:15 pm
MDW
- GEG
2 stops8h 40m
Southwest
Tue 8/257:30 am
GEG
- MDW
2 stops9h 30m
Southwest
Deal found 7/10![Southwest logo]()
$244
This American Airlines deal was found by Cheapflights users on 7/10. 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.
Sat 8/2211:30 am
ORD
- GEG
Nonstop4h 07m
American Airlines
Sat 8/292:27 pm
GEG
- ORD
Nonstop4h 01m
American Airlines
Deal found 7/10![American Airlines logo]()
$249
This Delta deal was found by Cheapflights users on 7/10. 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 8/251:51 pm
MDW
- GEG
2 stops11h 35m
Delta
Tue 9/17:54 pm
GEG
- MDW
2 stops10h 45m
Delta
Deal found 7/10![Delta logo]()
$243
This Southwest deal was found by Cheapflights users on 7/10. 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.
Thu 8/278:50 pm
MDW
- GEG
Nonstop3h 50m
Southwest
Tue 9/84:55 pm
GEG
- MDW
1 stop10h 05m
Southwest
Deal found 7/10![Southwest logo]()
$241
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 July 11, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated July 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Thu 9/106:50 am
ORD
- BOI
1 stop9h 07m
Frontier
Deal found 7/8![Frontier logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 7/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/710:40 pm
ORD
- BOI
1 stop13h 48m
Frontier
Deal found 7/9![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Wed 9/911:06 am
ORD
- BOI
1 stop25h 58m
Frontier
Deal found 7/8![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Mon 10/510:40 pm
ORD
- BOI
1 stop14h 24m
Frontier
Deal found 7/8![Frontier logo]()
$103
This American Airlines deal was found by Cheapflights users on 7/7. 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.
Mon 10/511:35 am
ORD
- BOI
Nonstop3h 58m
American Airlines
Deal found 7/7![American Airlines logo]()
$107
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Wed 9/96:50 am
ORD
- GEG
1 stop28h 29m
Multiple Airlines
Deal found 7/8![Multiple Airlines logo]()
$110
This Kiwi.com deal was found by Cheapflights users on 7/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/101:02 pm
ORD
- IDA
1 stop23h 48m
Multiple Airlines
Deal found 7/9![Multiple Airlines logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Mon 8/179:57 pm
ORD
- BOI
1 stop15h 32m
Frontier
Deal found 7/8![Frontier logo]()
$112
This Southwest deal was found by Cheapflights users on 7/7. 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 9/55:05 pm
MDW
- BOI
1 stop5h 25m
Southwest
Deal found 7/7![Southwest logo]()
$117
This Delta deal was found by Cheapflights users on 7/7. 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.
Thu 9/175:44 pm
ORD
- BOI
1 stop7h 14m
Delta
Deal found 7/7![Delta logo]()
$117
This Delta deal was found by Cheapflights users on 7/7. 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.
Wed 8/127:44 pm
ORD
- GEG
1 stop5h 42m
Delta
Deal found 7/7![Delta logo]()
$117
This Southwest deal was found by Cheapflights users on 7/7. 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 8/125:20 pm
MDW
- GEG
1 stop7h 35m
Southwest
Deal found 7/7![Southwest logo]()
$117
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 July 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $221 (Kiwi.com) |
One-way from | $80 (Kiwi.com) |
Popular in | June |
Cheapest in | February |
Average price | $384 |
Good round-trip deal | $355 or less |
Good one-way deal | $225 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 July 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
Tue 8/25
2:36 pm-9:33 pm
1 stop8h 57m
Spokane
Tue 9/1
2:05 pm-9:47 pm
1 stop5h 42m
$233
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Tue 8/25
7:25 pm-11:09 pm
1 stop5h 44m
Spokane
Tue 9/1
7:54 pm-8:39 am
2 stops10h 45m
$238
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Wed 8/19
1:59 pm-11:26 pm
2 stops11h 27m
Spokane
Wed 8/26
6:16 am-5:40 pm
1 stop9h 24m
$238
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Wed 8/12
2:00 pm-9:16 pm
2 stops9h 16m
Spokane
Sat 8/22
12:36 pm-11:57 pm
1 stop9h 21m
$238
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Sat 9/5
5:40 am-10:45 am
1 stop7h 05m
Spokane
Mon 9/14
12:20 pm-11:45 pm
1 stop9h 25m
$251
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Thu 8/27
7:00 am-12:08 pm
1 stop7h 08m
Spokane
Tue 9/8
5:10 am-1:29 pm
1 stop6h 19m
$251
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Tue 8/4
1:59 pm-11:26 pm
2 stops11h 27m
Spokane
Tue 8/11
9:52 am-6:19 pm
1 stop6h 27m
$256
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Sat 9/5
8:30 am-2:30 pm
1 stop7h 00m
Boise Air Term. Gowen Fld
Sat 9/12
3:25 pm-10:20 pm
1 stop5h 55m
$263
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Thu 9/24
5:47 pm-11:59 pm
1 stop7h 12m
Boise Air Term. Gowen Fld
Tue 9/29
2:50 pm-11:16 pm
1 stop7h 26m
$263
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Thu 8/20
7:45 pm-11:59 pm
1 stop5h 14m
Boise Air Term. Gowen Fld
Tue 8/25
6:00 am-1:38 pm
1 stop6h 38m
$263
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to Idaho
Have a flexible travel schedule? Discover the best time to fly to Idaho from Illinois with our price prediction graph.
ORD-GEG
MDW-GEG
STL-BOI
ORD-BOI
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
MDW-GEG
STL-BOI
ORD-BOI
What is the cheapest month to book a flight from Illinois to Idaho?
Currently, August is the cheapest month in which you can book a flight from Illinois to Idaho (average of $114). Flying from Illinois to Idaho in June is currently the most expensive (average of $279). 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 July 11, 2026.
It’s typically best to fly out from Illinois to Idaho at noon. Doing so could potentially save you 29% 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 July 11, 2026.
The most flights from USIL to USID are scheduled on a Monday (7 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (6 on average).
How much does it cost to fly round-trip from Illinois to Idaho?
How far ahead should I book a flight from Illinois to Idaho?
The best time to book flights from Illinois to Idaho is 62 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
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 July 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.
Boarding
8.1
Food
7.1
Comfort
7.8
Overall
7.9
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Boarding
8.1
Food
7.1
Comfort
7.8
Overall
7.9
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Boarding
8.1
Food
7.1
Comfort
7.8
Overall
7.9
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Boarding
8.1
Food
7.1
Comfort
7.8
Overall
7.9
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Boarding
8.1
Food
7.1
Comfort
7.8
Overall
7.9
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Boarding
8.1
Food
7.1
Comfort
7.8
Overall
7.9
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
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 July 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 5 airlines flying from Illinois to Idaho
Discover the top 5 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 July 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$263 | Average$505 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$268 | Average$466 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$268 | Average$403 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$288 | Average$439 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$348 | Average$364 | FlexibilityNo cancel fee | On-time75% |