$116+ 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 11/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
set 7 — set 141
Round-trip
1 adult, Economy
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Cheapest flights from Illinois to IdahoExplore the most affordable flight options available from Illinois to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 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 agosto 8, 2026.
This Frontier deal was found by Cheapflights users on 8/4. 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.
gio 11/57:00 am -
1 stop8h 57m
lun 11/93:52 pm -
1 stop12h 43m
Deal found 8/4![Frontier logo]()
$232
This Frontier deal was found by Cheapflights users on 8/4. 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.
sab 9/52:41 pm -
1 stop21h 48m
ven 9/112:50 pm -
1 stop13h 48m
Deal found 8/4![Frontier logo]()
$241
This CheapOair deal was found by Cheapflights users on 8/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 9/91:21 pm -
1 stop25h 34m
lun 9/142:50 pm -
1 stop13h 48m
Deal found 8/3![Frontier logo]()
$242
This Frontier deal was found by Cheapflights users on 8/5. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
gio 10/226:50 am -
1 stop9h 07m
lun 10/263:52 pm -
1 stop12h 50m
Deal found 8/5![Frontier logo]()
$257
This Frontier deal was found by Cheapflights users on 8/5. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven 10/166:50 am -
1 stop9h 07m
lun 10/193:52 pm -
1 stop12h 50m
Deal found 8/5![Frontier logo]()
$259
This CheapOair deal was found by Cheapflights users on 8/6. 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.
gio 9/178:55 pm -
1 stop18h 00m
lun 9/212:50 pm -
1 stop13h 48m
Deal found 8/6![Frontier logo]()
$267
This CheapOair deal was found by Cheapflights users on 8/5. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 9/161:21 pm -
1 stop25h 34m
dom 9/202:50 pm -
1 stop13h 48m
Deal found 8/5![Frontier logo]()
$269
This CheapOair deal was found by Cheapflights users on 8/5. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 8/262:41 pm -
1 stop21h 48m
dom 8/3012:24 pm -
1 stop24h 12m
Deal found 8/5![Frontier logo]()
$271
This American Airlines deal was found by Cheapflights users on 8/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sab 9/1910:45 am -
Nonstop3h 43m
mar 9/221:58 pm -
Nonstop3h 37m
Deal found 8/3![American Airlines logo]()
$281
This Frontier deal was found by Cheapflights users on 8/4. 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.
lun 10/126:50 am -
1 stop9h 07m
ven 10/163:52 pm -
1 stop12h 50m
Deal found 8/4![Frontier logo]()
$284
This Frontier deal was found by Cheapflights users on 8/4. 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.
lun 9/77:58 pm -
1 stop17h 31m
lun 9/142:50 pm -
1 stop19h 42m
Deal found 8/4![Frontier logo]()
$285
This CheapOair deal was found by Cheapflights users on 8/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
gio 9/1012:17 pm -
1 stop26h 38m
gio 9/172:50 pm -
1 stop19h 37m
Deal found 8/3![Frontier logo]()
$294
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 agosto 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 agosto 8, 2026.
This Alaska Airlines deal was found by Cheapflights users on 8/3. 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.
mar 9/228:00 am -
1 stop8h 30m
mar 9/296:49 pm -
1 stop17h 33m
Deal found 8/3![Alaska Airlines logo]()
$311
This United Airlines deal was found by Cheapflights users on 8/5. 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.
gio 10/15:00 am -
1 stop5h 53m
mar 10/64:05 pm -
1 stop5h 41m
Deal found 8/5![United Airlines logo]()
$320
This Delta deal was found by Cheapflights users on 8/7. 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.
sab 9/58:28 am -
2 stops9h 41m
ven 9/119:23 am -
1 stop6h 38m
Deal found 8/7![Delta logo]()
$322
This American Airlines deal was found by Cheapflights users on 8/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar 11/311:12 am -
Nonstop4h 12m
mar 11/102:14 pm -
Nonstop3h 53m
Deal found 8/3![American Airlines logo]()
$331
This Southwest deal was found by Cheapflights users on 8/6. 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.
mar 9/222:10 pm -
1 stop9h 20m
lun 9/2812:10 pm -
Nonstop3h 20m
Deal found 8/6![Southwest logo]()
$341
This Delta deal was found by Cheapflights users on 8/7. 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.
sab 9/59:59 am -
2 stops8h 10m
ven 9/115:24 am -
2 stops8h 53m
Deal found 8/7![Delta logo]()
$327
This Alaska Airlines deal was found by Cheapflights users on 8/7. 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.
mer 10/217:00 am -
1 stop9h 23m
sab 10/2410:06 am -
1 stop7h 14m
Deal found 8/7![Alaska Airlines logo]()
$331
This United Airlines deal was found by Cheapflights users on 8/4. 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.
sab 9/57:50 pm -
Nonstop4h 03m
lun 9/145:40 pm -
1 stop5h 19m
Deal found 8/4![United Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 8/7. 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.
gio 9/248:50 pm -
Nonstop3h 55m
sab 9/2611:05 am -
1 stop7h 45m
Deal found 8/7![Southwest logo]()
$341
This Delta deal was found by Cheapflights users on 8/4. 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.
mer 9/97:00 am -
1 stop7h 20m
ven 9/111:00 pm -
1 stop8h 57m
Deal found 8/4![Delta logo]()
$334
This United Airlines deal was found by Cheapflights users on 8/7. 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.
ven 9/255:00 am -
1 stop5h 53m
mar 9/295:51 pm -
1 stop5h 08m
Deal found 8/7![United Airlines logo]()
$336
This Southwest deal was found by Cheapflights users on 8/6. 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.
sab 9/55:40 am -
1 stop8h 20m
lun 9/142:55 pm -
1 stop7h 55m
Deal found 8/6![Southwest logo]()
$342
This Alaska Airlines deal was found by Cheapflights users on 8/6. 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.
dom 9/136:00 am -
1 stop8h 39m
sab 9/1912:17 pm -
1 stop9h 42m
Deal found 8/6![Alaska Airlines logo]()
$348
This American Airlines deal was found by Cheapflights users on 8/7. 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.
mar 8/181:50 pm -
1 stop8h 30m
gio 8/271:43 pm -
Nonstop3h 35m
Deal found 8/7![American Airlines logo]()
$390
This Delta deal was found by Cheapflights users on 8/7. 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.
ven 10/162:03 pm -
1 stop5h 13m
lun 10/196:00 am -
1 stop4h 55m
Deal found 8/7![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 8/8. 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.
gio 9/102:50 pm -
1 stop6h 55m
lun 9/142:55 pm -
1 stop7h 55m
Deal found 8/8![Southwest logo]()
$351
This Alaska Airlines deal was found by Cheapflights users on 8/7. 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.
ven 10/97:16 pm -
1 stop6h 39m
dom 10/117:46 pm -
1 stop7h 54m
Deal found 8/7![Alaska Airlines logo]()
$368
This United Airlines deal was found by Cheapflights users on 8/3. 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.
ven 10/98:40 am -
Nonstop3h 48m
lun 10/126:50 pm -
1 stop9h 04m
Deal found 8/3![United Airlines logo]()
$372
This Delta deal was found by Cheapflights users on 8/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven 10/237:35 am -
1 stop5h 47m
lun 10/266:00 am -
1 stop4h 55m
Deal found 8/3![Delta logo]()
$339
This American Airlines deal was found by Cheapflights users on 8/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
gio 9/247:27 am -
1 stop8h 04m
mar 9/296:30 am -
1 stop6h 14m
Deal found 8/4![American Airlines logo]()
$420
This Southwest deal was found by Cheapflights users on 8/4. 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.
sab 9/269:25 am -
1 stop7h 10m
sab 10/102:15 pm -
1 stop6h 50m
Deal found 8/4![Southwest logo]()
$351
This Alaska Airlines deal was found by Cheapflights users on 8/7. 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.
ven 11/67:00 am -
1 stop9h 17m
lun 11/91:53 pm -
1 stop9h 04m
Deal found 8/7![Alaska Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 8/4. 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.
mer 9/302:05 pm -
1 stop5h 12m
dom 10/46:00 am -
1 stop4h 55m
Deal found 8/4![Delta logo]()
$350
This Southwest deal was found by Cheapflights users on 8/7. 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.
mer 9/22:10 pm -
1 stop9h 55m
mer 9/161:55 pm -
1 stop7h 00m
Deal found 8/7![Southwest logo]()
$351
This American Airlines deal was found by Cheapflights users on 8/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
gio 9/35:42 am -
1 stop6h 34m
gio 9/101:52 pm -
2 stops8h 51m
Deal found 8/6![American Airlines logo]()
$428
This United Airlines deal was found by Cheapflights users on 8/6. 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.
gio 8/275:00 am -
1 stop5h 51m
dom 8/302:25 pm -
1 stop7h 21m
Deal found 8/6![United Airlines logo]()
$400
This Delta deal was found by Cheapflights users on 8/5. 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.
gio 10/12:05 pm -
1 stop8h 52m
mar 10/65:30 am -
1 stop5h 09m
Deal found 8/5![Delta logo]()
$351
This American Airlines deal was found by Cheapflights users on 8/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 9/218:00 am -
1 stop6h 22m
gio 9/241:52 pm -
2 stops8h 51m
Deal found 8/3![American Airlines logo]()
$429
This Southwest deal was found by Cheapflights users on 8/5. 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.
sab 9/196:50 am -
1 stop5h 05m
sab 9/264:05 pm -
2 stops11h 25m
Deal found 8/5![Southwest logo]()
$356
This Alaska Airlines deal was found by Cheapflights users on 8/4. 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.
mar 11/107:00 am -
1 stop9h 27m
mer 11/116:33 am -
1 stop6h 42m
Deal found 8/4![Alaska Airlines logo]()
$417
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated agosto 8, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated agosto 8, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 8/5. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 8/262:41 pm -
1 stop21h 48m
dom 8/3012:24 pm -
1 stop24h 12m
Deal found 8/5![Frontier logo]()
$271
This Frontier deal was found by Cheapflights users on 8/4. 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.
sab 9/52:41 pm -
1 stop21h 48m
ven 9/112:50 pm -
1 stop13h 48m
Deal found 8/4![Frontier logo]()
$241
This United Airlines deal was found by Cheapflights users on 8/7. 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.
sab 9/59:15 am -
Nonstop4h 23m
ven 9/111:37 pm -
1 stop6h 23m
Deal found 8/7![United Airlines logo]()
$307
This Southwest deal was found by Cheapflights users on 8/6. 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.
sab 9/55:05 pm -
1 stop5h 55m
ven 9/116:00 am -
Nonstop3h 30m
Deal found 8/6![Southwest logo]()
$307
This Frontier deal was found by Cheapflights users on 8/4. 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.
lun 9/77:58 pm -
1 stop17h 31m
lun 9/142:50 pm -
1 stop19h 42m
Deal found 8/4![Frontier logo]()
$285
This CheapOair deal was found by Cheapflights users on 8/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 9/91:21 pm -
1 stop25h 34m
lun 9/142:50 pm -
1 stop13h 48m
Deal found 8/3![Frontier logo]()
$242
This CheapOair deal was found by Cheapflights users on 8/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
gio 9/1012:17 pm -
1 stop26h 38m
gio 9/172:50 pm -
1 stop19h 37m
Deal found 8/3![Frontier logo]()
$294
This United Airlines deal was found by Cheapflights users on 8/3. 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.
mar 9/157:00 am -
1 stop7h 29m
mar 9/224:04 pm -
1 stop5h 42m
Deal found 8/3![United Airlines logo]()
$301
This CheapOair deal was found by Cheapflights users on 8/5. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 9/161:21 pm -
1 stop25h 34m
dom 9/202:50 pm -
1 stop13h 48m
Deal found 8/5![Frontier logo]()
$269
This CheapOair deal was found by Cheapflights users on 8/6. 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.
gio 9/178:55 pm -
1 stop18h 00m
lun 9/212:50 pm -
1 stop13h 48m
Deal found 8/6![Frontier logo]()
$267
This American Airlines deal was found by Cheapflights users on 8/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sab 9/1910:45 am -
Nonstop3h 43m
mar 9/221:58 pm -
Nonstop3h 37m
Deal found 8/3![American Airlines logo]()
$281
This American Airlines deal was found by Cheapflights users on 8/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sab 9/2610:45 am -
Nonstop3h 43m
dom 10/41:58 pm -
Nonstop3h 37m
Deal found 8/4![American Airlines logo]()
$300
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 agosto 8, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated agosto 8, 2026.
This Frontier deal was found by Cheapflights users on 8/4. 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.
gio 11/57:00 am -
1 stop8h 57m
Deal found 8/4![Frontier logo]()
$116
This CheapOair deal was found by Cheapflights users on 8/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
gio 9/178:55 pm -
1 stop18h 00m
Deal found 8/3![Frontier logo]()
$127
This CheapOair deal was found by Cheapflights users on 8/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 10/71:21 pm -
1 stop26h 36m
Deal found 8/8![Frontier logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 8/3. 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.
mer 9/301:21 pm -
1 stop25h 34m
Deal found 8/3![Frontier logo]()
$143
This United Airlines deal was found by Cheapflights users on 8/7. 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.
dom 9/69:15 am -
Nonstop4h 24m
Deal found 8/7![United Airlines logo]()
$149
This Southwest deal was found by Cheapflights users on 8/7. 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.
dom 9/611:10 am -
Nonstop3h 45m
Deal found 8/7![Southwest logo]()
$149
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sab 9/57:44 pm -
2 stops16h 45m
Deal found 8/4![Frontier logo]()
$150
This CheapOair deal was found by Cheapflights users on 8/4. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 9/2312:17 pm -
1 stop26h 38m
Deal found 8/4![Frontier logo]()
$150
This Alaska Airlines deal was found by Cheapflights users on 8/6. 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.
sab 9/56:54 pm -
1 stop15h 58m
Deal found 8/6![Alaska Airlines logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
gio 9/108:55 pm -
1 stop15h 55m
Deal found 8/4![Multiple Airlines logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 8/3. 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.
mer 11/412:03 pm -
2 stops27h 54m
Deal found 8/3![Frontier logo]()
$156
This Alaska Airlines deal was found by Cheapflights users on 8/7. 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.
mar 9/86:00 am -
1 stop7h 35m
Deal found 8/7![Alaska Airlines logo]()
$156
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 agosto 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $232 (Frontier) |
One-way from | $116 (Frontier) |
Popular in | December |
Cheapest in | February |
Average price | $389 |
Good round-trip deal | $380 or less |
Good one-way deal | $249 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 agosto 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
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
mar 9/22
8:00 am-3:30 pm
1 stop8h 30m
Boise Air Term. Gowen Fld
mar 9/29
6:49 pm-1:22 pm
1 stop17h 33m
$311
ChicagoIdaho Falls
ORD Chicago O'Hare Intl - IDA Idaho Falls Fanning Field
ORDIDA
Chicago O'Hare Intl
gio 10/1
5:00 am-9:53 am
1 stop5h 53m
Idaho Falls Fanning Field
mar 10/6
4:05 pm-10:46 pm
1 stop5h 41m
$320
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
sab 9/5
8:28 am-4:09 pm
2 stops9h 41m
Spokane
ven 9/11
9:23 am-6:01 pm
1 stop6h 38m
$322
ChicagoSpokane
MDW Chicago Midway - GEG Spokane
MDWGEG
Chicago Midway
sab 9/5
9:59 am-4:09 pm
2 stops8h 10m
Spokane
ven 9/11
5:24 am-4:17 pm
2 stops8h 53m
$327
Quickest round-trip
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
mar 11/3
11:12 am-1:24 pm
Nonstop4h 12m
Spokane
mar 11/10
2:14 pm-8:07 pm
Nonstop3h 53m
$331
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
mer 10/21
7:00 am-3:23 pm
1 stop9h 23m
Boise Air Term. Gowen Fld
sab 10/24
10:06 am-6:20 pm
1 stop7h 14m
$331
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
sab 9/5
7:50 pm-10:53 pm
Nonstop4h 03m
Boise Air Term. Gowen Fld
lun 9/14
5:40 pm-11:59 pm
1 stop5h 19m
$332
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
mer 9/9
7:00 am-12:20 pm
1 stop7h 20m
Spokane
ven 9/11
1:00 pm-11:57 pm
1 stop8h 57m
$334
ChicagoIdaho Falls
ORD Chicago O'Hare Intl - IDA Idaho Falls Fanning Field
ORDIDA
Chicago O'Hare Intl
ven 9/25
5:00 am-9:53 am
1 stop5h 53m
Idaho Falls Fanning Field
mar 9/29
5:51 pm-11:59 pm
1 stop5h 08m
$336
ChicagoIdaho Falls
ORD Chicago O'Hare Intl - IDA Idaho Falls Fanning Field
ORDIDA
Chicago O'Hare Intl
ven 10/16
2:03 pm-6:16 pm
1 stop5h 13m
Idaho Falls Fanning Field
lun 10/19
6:00 am-11:55 am
1 stop4h 55m
$339
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-IDA
STL-BOI
ORD-GEG
MDW-GEG
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-IDA
STL-BOI
ORD-GEG
What is the cheapest month to book a flight from Illinois to Idaho?
Currently, February is the cheapest month in which you can book a flight from Illinois to Idaho (average of $323). Flying from Illinois to Idaho in December is currently the most expensive (average of $545). 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 agosto 8, 2026.
It’s typically best to fly out from Illinois to Idaho at noon. Doing so could potentially save you 24% 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?
Airfare is below average for this route at the moment.
Illinois to Idaho flights typically cost between $309 and $397 in November.The cheapest round-trip price found within the last 5 days was $232 on Frontier (Nov 5-Nov 9).
How far ahead should I book a flight from Illinois to Idaho?
The best time to book flights from Illinois to Idaho is 74 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 agosto 8, 2026.
Read reviews from past customers who have flown Southwest,Alaska Airlines, 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.
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
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 agosto 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 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 agosto 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$268 | Average$473 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$268 | Average$339 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$269 | Average$499 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$288 | Average$458 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$348 | Average$364 | FlexibilityNo cancel fee | On-time75% |