$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 7 — Apr 141
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 March 8, 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 8, 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 Orbitz deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/164:10 pm
ORD
- GEG
1 stop9h 49m
Alaska Airlines
Tue 4/217:43 pm
GEG
- ORD
1 stop8h 57m
Alaska Airlines
Deal found 3/5![Alaska Airlines logo]()
$246
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 3/4. Clicking the “Pick Dates” 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 4/228:00 am
ORD
- BOI
1 stop6h 52m
Alaska Airlines
Tue 4/287:20 pm
BOI
- ORD
1 stop10h 20m
Alaska Airlines
Deal found 3/4![Alaska Airlines logo]()
$249
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 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 Expedia deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/243:52 pm
ORD
- GEG
1 stop8h 28m
Alaska Airlines
Wed 4/296:00 am
GEG
- ORD
1 stop8h 56m
Alaska Airlines
Deal found 3/5![Alaska Airlines logo]()
$253
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 8, 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 8, 2026.
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 United Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 4/152:05 pm
ORD
- GEG
1 stop9h 06m
United Airlines
Sat 4/187:10 am
GEG
- ORD
Nonstop3h 46m
United Airlines
Deal found 3/5![United Airlines logo]()
$276
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.
Tue 4/215:45 am
STL
- BOI
2 stops8h 35m
Southwest
Tue 4/286:40 am
BOI
- STL
1 stop6h 10m
Southwest
Deal found 3/6![Southwest logo]()
$282
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.
Thu 4/95:51 am
STL
- BOI
1 stop7h 58m
American Airlines
Tue 4/141:29 pm
BOI
- STL
1 stop7h 50m
American Airlines
Deal found 3/7![American Airlines logo]()
$312
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.
Tue 4/73:50 pm
STL
- BOI
1 stop9h 06m
Alaska Airlines
Wed 4/82:22 pm
BOI
- STL
1 stop8h 37m
Alaska Airlines
Deal found 3/7![Alaska Airlines logo]()
$345
This Kiwi.com deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 5/303:48 pm
STL
- IDA
2 stops18h 08m
Multiple Airlines
Fri 6/510:56 pm
IDA
- STL
1 stop17h 49m
Multiple Airlines
Deal found 3/5![Multiple Airlines logo]()
$417
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.
Fri 4/176:00 pm
ORD
- GEG
1 stop7h 15m
Delta
Sun 4/195:00 am
GEG
- ORD
1 stop6h 23m
Delta
Deal found 3/6![Delta logo]()
$265
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 3/4. Clicking the “Pick Dates” 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 6/33:47 pm
ORD
- BOI
1 stop7h 18m
United Airlines
Sun 6/75:46 pm
BOI
- ORD
1 stop5h 58m
United Airlines
Deal found 3/4![United Airlines logo]()
$289
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.
Fri 5/86:20 pm
ORD
- GEG
1 stop7h 39m
Delta
Tue 5/127:23 pm
GEG
- ORD
2 stops11h 04m
Delta
Deal found 3/6![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.
Sat 8/85:00 am
ORD
- BOI
1 stop5h 53m
United Airlines
Thu 8/135:44 pm
BOI
- ORD
1 stop5h 15m
United Airlines
Deal found 3/6![United Airlines logo]()
$289
This Southwest deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 4/204:05 pm
MDW
- BOI
2 stops8h 25m
Southwest
Mon 4/274:20 pm
BOI
- MDW
1 stop6h 20m
Southwest
Deal found 3/5![Southwest logo]()
$294
This Delta deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 4/151:36 pm
ORD
- GEG
2 stops12h 44m
Delta
Sat 4/186:15 am
GEG
- ORD
2 stops9h 56m
Delta
Deal found 3/5![Delta logo]()
$275
This United Airlines deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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 6/215:00 am
ORD
- BOI
1 stop5h 45m
United Airlines
Sat 6/275:46 pm
BOI
- ORD
1 stop5h 58m
United Airlines
Deal found 3/4![United Airlines logo]()
$289
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.
Fri 4/241:36 pm
ORD
- GEG
2 stops12h 44m
Delta
Tue 4/286:15 am
GEG
- ORD
2 stops9h 49m
Delta
Deal found 3/7![Delta logo]()
$275
This Alaska 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 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 3/6![Alaska Airlines logo]()
$374
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 6/34:00 pm
MDW
- GEG
2 stops9h 25m
Southwest
Mon 6/86:25 am
GEG
- MDW
Nonstop3h 30m
Southwest
Deal found 3/7![Southwest logo]()
$297
This United Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 5/305:10 am
STL
- IDA
1 stop5h 40m
United Airlines
Fri 6/55:54 pm
IDA
- STL
1 stop5h 03m
United Airlines
Deal found 3/5![United Airlines logo]()
$299
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.
Tue 4/72:05 pm
MDW
- GEG
2 stops11h 58m
Delta
Mon 4/137:38 pm
GEG
- MDW
2 stops11h 09m
Delta
Deal found 3/8![Delta logo]()
$275
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.
Fri 4/177:00 am
STL
- BOI
1 stop9h 29m
Alaska Airlines
Mon 4/276:08 pm
BOI
- STL
1 stop28h 51m
Alaska Airlines
Deal found 3/7![Alaska Airlines logo]()
$378
This Southwest deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/54:55 pm
MDW
- BOI
2 stops10h 00m
Southwest
Tue 4/145:00 pm
BOI
- MDW
2 stops10h 35m
Southwest
Deal found 3/4![Southwest logo]()
$299
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.
Sat 8/85:00 am
ORD
- BOI
1 stop5h 53m
United Airlines
Fri 8/1412:23 pm
BOI
- ORD
Nonstop3h 35m
United Airlines
Deal found 3/8![United Airlines logo]()
$300
This Alaska Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/155:33 pm
STL
- BOI
1 stop7h 25m
Alaska Airlines
Tue 5/196:23 pm
BOI
- STL
2 stops21h 14m
Alaska Airlines
Deal found 3/5![Alaska Airlines logo]()
$382
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.
Fri 4/107:10 pm
ORD
- BOI
1 stop5h 49m
Delta
Mon 4/1311:35 pm
BOI
- ORD
1 stop8h 05m
Delta
Deal found 3/8![Delta logo]()
$289
This Southwest deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/26:35 pm
MDW
- GEG
2 stops8h 30m
Southwest
Thu 4/96:50 am
GEG
- MDW
1 stop7h 25m
Southwest
Deal found 3/4![Southwest logo]()
$300
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.
Fri 5/156:20 pm
ORD
- BOI
1 stop6h 35m
Delta
Mon 5/2511:39 pm
BOI
- ORD
1 stop8h 00m
Delta
Deal found 3/8![Delta logo]()
$289
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.
Wed 5/2712:56 pm
ORD
- JAC
1 stop5h 58m
United Airlines
Mon 6/17:30 am
JAC
- ORD
Nonstop3h 10m
United Airlines
Deal found 3/3![United Airlines logo]()
$319
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.
Tue 4/76:05 pm
MDW
- GEG
1 stop7h 20m
Southwest
Mon 4/132:50 pm
GEG
- MDW
1 stop6h 50m
Southwest
Deal found 3/8![Southwest logo]()
$302
This Delta deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/11:19 pm
ORD
- BOI
2 stops9h 45m
Delta
Tue 4/74:43 pm
BOI
- ORD
1 stop6h 57m
Delta
Deal found 3/4![Delta logo]()
$294
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated March 8, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated March 8, 2026 and is based on user searches.
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 Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:00 am
ORD
- BOI
1 stop8h 58m
Alaska Airlines
Sat 4/184:15 pm
BOI
- ORD
1 stop6h 44m
Alaska Airlines
Deal found 3/3![Alaska Airlines logo]()
$229
This Orbitz deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/164:10 pm
ORD
- GEG
1 stop9h 49m
Alaska Airlines
Tue 4/217:43 pm
GEG
- ORD
1 stop8h 57m
Alaska Airlines
Deal found 3/5![Alaska Airlines logo]()
$246
This Trip.com deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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.
Sat 4/187:00 am
STL
- BOI
1 stop9h 29m
Alaska Airlines
Sat 4/254:38 pm
BOI
- STL
1 stop6h 21m
Alaska Airlines
Deal found 3/4![Alaska Airlines logo]()
$259
This Trip.com deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 4/204:10 pm
ORD
- BOI
1 stop8h 37m
Multiple Airlines
Mon 4/272:57 pm
BOI
- ORD
1 stop8h 02m
Multiple Airlines
Deal found 3/5![Multiple Airlines logo]()
$254
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 3/4. Clicking the “Pick Dates” 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 4/228:00 am
ORD
- BOI
1 stop6h 52m
Alaska Airlines
Tue 4/287:20 pm
BOI
- ORD
1 stop10h 20m
Alaska Airlines
Deal found 3/4![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 Expedia deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/243:52 pm
ORD
- GEG
1 stop8h 28m
Alaska Airlines
Wed 4/296:00 am
GEG
- ORD
1 stop8h 56m
Alaska Airlines
Deal found 3/5![Alaska Airlines logo]()
$253
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 8, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated March 8, 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 Kiwi.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 Kiwi.com 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 3/6![Frontier logo]()
$110
This Kiwi.com 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 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 3/3![Multiple Airlines logo]()
$112
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/46:00 am
ORD
- GEG
1 stop8h 40m
Alaska Airlines
Deal found 3/3![Alaska Airlines logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/69:18 pm
ORD
- GEG
1 stop25h 11m
Multiple Airlines
Deal found 3/5![Multiple Airlines logo]()
$120
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 5/95:41 pm
ORD
- BOI
1 stop7h 05m
Delta
Deal found 3/7![Delta logo]()
$121
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 3/4. Clicking the “Pick Dates” 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 5/56:00 am
ORD
- BOI
1 stop8h 52m
Alaska Airlines
Deal found 3/4![Alaska Airlines logo]()
$125
This Frontier deal was found by Cheapflights users on 3/4. Clicking the “Pick Dates” 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.
Thu 4/27:55 am
ORD
- GEG
1 stop9h 19m
Frontier
Deal found 3/4![Frontier 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 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 4/47:10 am
ORD
- BOI
2 stops11h 08m
Delta
Deal found 3/8![Delta logo]()
$126
This Alaska Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 6/32:10 pm
ORD
- GEG
1 stop9h 35m
Alaska Airlines
Deal found 3/5![Alaska Airlines logo]()
$128
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 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $222 (CheapOair) |
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 8, 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
ChicagoBoise
MDW - BOI
MDWBOI
Chicago Midway
Sat 4/11
2:05 pm-9:09 pm
1 stop8h 04m
Boise Air Term. Gowen Fld
Sat 4/18
5:34 am-1:32 pm
1 stop6h 58m
$241
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Fri 4/17
6:00 pm-11:15 pm
1 stop7h 15m
Spokane
Sun 4/19
5:00 am-1:23 pm
1 stop6h 23m
$265
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Fri 5/8
6:20 pm-11:59 pm
1 stop7h 39m
Spokane
Tue 5/12
7:23 pm-8:27 am
2 stops11h 04m
$270
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Wed 4/15
1:36 pm-12:20 am
2 stops12h 44m
Spokane
Sat 4/18
6:15 am-6:11 pm
2 stops9h 56m
$275
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Fri 4/24
1:36 pm-12:20 am
2 stops12h 44m
Spokane
Tue 4/28
6:15 am-6:04 pm
2 stops9h 49m
$275
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
$275
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Wed 4/15
2:05 pm-9:11 pm
1 stop9h 06m
Spokane
Sat 4/18
7:10 am-12:56 pm
Nonstop3h 46m
$276
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Tue 4/21
5:45 am-1:20 pm
2 stops8h 35m
Boise Air Term. Gowen Fld
Tue 4/28
6:40 am-1:50 pm
1 stop6h 10m
$282
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
Wed 6/3
3:47 pm-10:05 pm
1 stop7h 18m
Boise Air Term. Gowen Fld
Sun 6/7
5:46 pm-12:44 am
1 stop5h 58m
$289
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-GEG
MDW-BOI
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-GEG
MDW-BOI
What is the cheapest month to book a flight from Illinois to Idaho?
Currently, July is the cheapest month in which you can book a flight from Illinois to Idaho (average of $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 8, 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 8, 2026.
The most flights from USIL to USID are scheduled on a Tuesday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (5 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 8, 2026.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta from Illinois to Idaho. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Food
7.1
Comfort
7.8
Overall
8.0
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Food
7.1
Comfort
7.8
Overall
8.0
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Food
7.1
Comfort
7.8
Overall
8.0
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Food
7.1
Comfort
7.8
Overall
8.0
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Food
7.1
Comfort
7.8
Overall
8.0
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Food
7.1
Comfort
7.8
Overall
8.0
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Related info for your journey
Find useful and relevant information for your journey from Illinois to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Illinois to Idaho
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Idaho by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to Idaho by cabin class
Find flights from Illinois to Idaho, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Idaho flights
Browse other Illinois and Idaho flight options. Last updated on March 8, 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 8, 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% |