$214+ Cheap flights from Great Falls (GTF) to Illinois
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 2/15. Fares are subject to change and may not be available on all flights or dates of travel.
GTF — ORD
Mar 6 — Mar 131
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Great Falls to Illinois with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Great Falls to Illinois
Cheapest
Best
Last-minute
One-way
Cheapest flights from Great Falls to IllinoisExplore the most affordable flight options available from Great Falls to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 4, 2026.
Explore the most affordable flight options available from Great Falls to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 4, 2026.
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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.
Tue 3/104:57 pm
GTF
- ORD
1 stop29h 59m
Alaska Airlines
Thu 3/127:00 am
ORD
- GTF
1 stop10h 17m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$298
This United Airlines deal was found by Cheapflights users on 2/3. 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 2/182:25 pm
GTF
- ORD
1 stop7h 28m
United Airlines
Sun 2/227:10 am
ORD
- GTF
1 stop7h 33m
United Airlines
Deal found 2/3![United Airlines logo]()
$377
This Delta deal was found by Cheapflights users on 2/3. 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.
Wed 2/186:20 pm
GTF
- ORD
2 stops13h 18m
Delta
Sun 2/227:15 am
ORD
- GTF
1 stop6h 15m
Delta
Deal found 2/3![Delta logo]()
$422
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/252:30 pm
GTF
- ORD
1 stop5h 59m
United Airlines
Sun 3/292:35 pm
ORD
- GTF
1 stop7h 42m
United Airlines
Deal found 2/2![United Airlines logo]()
$428
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/201:15 pm
GTF
- ORD
1 stop7h 37m
Delta
Fri 2/277:15 am
ORD
- GTF
1 stop6h 15m
Delta
Deal found 2/2![Delta logo]()
$433
This United Airlines deal was found by Cheapflights users on 2/3. 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.
Thu 7/912:30 pm
GTF
- ORD
Nonstop3h 16m
United Airlines
Mon 7/136:00 am
ORD
- GTF
1 stop16h 19m
United Airlines
Deal found 2/3![United Airlines logo]()
$436
This United Airlines deal was found by Cheapflights users on 2/3. 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.
Fri 2/132:25 pm
GTF
- ORD
1 stop7h 27m
United Airlines
Tue 2/177:10 am
ORD
- GTF
1 stop7h 33m
United Airlines
Deal found 2/3![United Airlines logo]()
$493
This Alaska Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/204:57 pm
GTF
- ORD
2 stops19h 14m
Alaska Airlines
Fri 2/277:00 am
ORD
- GTF
1 stop10h 17m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$536
This United Airlines deal was found by Cheapflights users on 2/3. 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.
Tue 2/172:25 pm
GTF
- ORD
1 stop7h 27m
United Airlines
Mon 2/232:02 pm
ORD
- GTF
1 stop8h 31m
United Airlines
Deal found 2/3![United Airlines logo]()
$538
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/96:20 pm
GTF
- MDW
2 stops13h 22m
Delta
Mon 7/131:00 pm
MDW
- GTF
2 stops10h 44m
Delta
Deal found 2/2![Delta logo]()
$647
This Delta deal was found by Cheapflights users on 2/3. 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.
Tue 3/105:30 am
GTF
- MDW
2 stops11h 24m
Delta
Thu 3/126:00 am
MDW
- GTF
2 stops12h 42m
Delta
Deal found 2/3![Delta logo]()
$699
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/205:20 am
GTF
- MDW
2 stops11h 17m
Delta
Fri 2/279:34 am
MDW
- GTF
2 stops8h 59m
Delta
Deal found 2/2![Delta logo]()
$969
Best flights from Great Falls to IllinoisDiscover carefully curated flight deals from Great Falls to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 4, 2026.
Discover carefully curated flight deals from Great Falls to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 4, 2026.
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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.
Tue 3/104:57 pm
GTF
- ORD
1 stop29h 59m
Alaska Airlines
Thu 3/127:00 am
ORD
- GTF
1 stop10h 17m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$298
This United Airlines deal was found by Cheapflights users on 2/3. 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 2/182:25 pm
GTF
- ORD
1 stop7h 28m
United Airlines
Sun 2/227:10 am
ORD
- GTF
1 stop7h 33m
United Airlines
Deal found 2/3![United Airlines logo]()
$377
This Delta deal was found by Cheapflights users on 2/3. 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.
Wed 2/186:20 pm
GTF
- ORD
2 stops13h 18m
Delta
Sun 2/227:15 am
ORD
- GTF
1 stop6h 15m
Delta
Deal found 2/3![Delta logo]()
$422
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/252:30 pm
GTF
- ORD
1 stop5h 59m
United Airlines
Sun 3/292:35 pm
ORD
- GTF
1 stop7h 42m
United Airlines
Deal found 2/2![United Airlines logo]()
$428
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/201:15 pm
GTF
- ORD
1 stop7h 37m
Delta
Fri 2/277:15 am
ORD
- GTF
1 stop6h 15m
Delta
Deal found 2/2![Delta logo]()
$433
This Alaska Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/204:57 pm
GTF
- ORD
2 stops19h 14m
Alaska Airlines
Fri 2/277:00 am
ORD
- GTF
1 stop10h 17m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$536
This United Airlines deal was found by Cheapflights users on 2/3. 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.
Fri 2/132:25 pm
GTF
- ORD
1 stop7h 27m
United Airlines
Tue 2/177:10 am
ORD
- GTF
1 stop7h 33m
United Airlines
Deal found 2/3![United Airlines logo]()
$493
This Alaska Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/174:57 pm
GTF
- ORD
1 stop29h 59m
Alaska Airlines
Mon 2/237:00 am
ORD
- GTF
1 stop10h 17m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$544
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/172:25 pm
GTF
- ORD
2 stops27h 10m
United Airlines
Mon 2/232:02 pm
ORD
- GTF
1 stop8h 31m
United Airlines
Deal found 2/2![United Airlines logo]()
$543
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/96:20 pm
GTF
- MDW
2 stops13h 22m
Delta
Mon 7/131:00 pm
MDW
- GTF
2 stops10h 44m
Delta
Deal found 2/2![Delta logo]()
$647
This Delta deal was found by Cheapflights users on 2/3. 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.
Tue 3/105:30 am
GTF
- MDW
2 stops11h 24m
Delta
Thu 3/126:00 am
MDW
- GTF
2 stops12h 42m
Delta
Deal found 2/3![Delta logo]()
$699
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/205:20 am
GTF
- MDW
2 stops11h 17m
Delta
Fri 2/279:34 am
MDW
- GTF
2 stops8h 59m
Delta
Deal found 2/2![Delta logo]()
$969
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/175:20 am
GTF
- MDW
2 stops11h 17m
Delta
Mon 2/231:28 pm
MDW
- GTF
2 stops10h 01m
Delta
Deal found 2/2![Delta logo]()
$1,059
This Delta deal was found by Cheapflights users on 2/3. 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.
Wed 2/185:20 am
GTF
- MDW
2 stops11h 25m
Delta
Sun 2/2210:49 am
MDW
- GTF
2 stops12h 40m
Delta
Deal found 2/3![Delta logo]()
$1,269
Last-minute flights from Great Falls to IllinoisDiscover last-minute flight deals from Great Falls to Illinois. Data last updated February 4, 2026 and is based on user searches.
Discover last-minute flight deals from Great Falls to Illinois. Data last updated February 4, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 2/3. 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.
Fri 2/132:25 pm
GTF
- ORD
1 stop7h 27m
United Airlines
Tue 2/177:10 am
ORD
- GTF
1 stop7h 33m
United Airlines
Deal found 2/3![United Airlines logo]()
$493
This United Airlines deal was found by Cheapflights users on 2/3. 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.
Tue 2/172:25 pm
GTF
- ORD
1 stop7h 27m
United Airlines
Mon 2/232:02 pm
ORD
- GTF
1 stop8h 31m
United Airlines
Deal found 2/3![United Airlines logo]()
$538
This Alaska Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/174:57 pm
GTF
- ORD
1 stop29h 59m
Alaska Airlines
Mon 2/237:00 am
ORD
- GTF
1 stop10h 17m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$544
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/175:20 am
GTF
- MDW
2 stops11h 17m
Delta
Mon 2/231:28 pm
MDW
- GTF
2 stops10h 01m
Delta
Deal found 2/2![Delta logo]()
$1,059
This United Airlines deal was found by Cheapflights users on 2/3. 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 2/182:25 pm
GTF
- ORD
1 stop7h 28m
United Airlines
Sun 2/227:10 am
ORD
- GTF
1 stop7h 33m
United Airlines
Deal found 2/3![United Airlines logo]()
$377
This Delta deal was found by Cheapflights users on 2/3. 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.
Wed 2/186:20 pm
GTF
- ORD
2 stops13h 18m
Delta
Sun 2/227:15 am
ORD
- GTF
1 stop6h 15m
Delta
Deal found 2/3![Delta logo]()
$422
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/201:15 pm
GTF
- ORD
1 stop7h 37m
Delta
Fri 2/277:15 am
ORD
- GTF
1 stop6h 15m
Delta
Deal found 2/2![Delta logo]()
$433
This Alaska Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/204:57 pm
GTF
- ORD
2 stops19h 14m
Alaska Airlines
Fri 2/277:00 am
ORD
- GTF
1 stop10h 17m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$536
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/205:20 am
GTF
- MDW
2 stops11h 17m
Delta
Fri 2/279:34 am
MDW
- GTF
2 stops8h 59m
Delta
Deal found 2/2![Delta logo]()
$969
This Alaska Airlines deal was found by Cheapflights users on 2/3. 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.
Tue 3/104:57 pm
GTF
- ORD
1 stop29h 59m
Alaska Airlines
Thu 3/127:00 am
ORD
- GTF
1 stop10h 17m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$298
This Delta deal was found by Cheapflights users on 2/3. 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.
Tue 3/105:30 am
GTF
- MDW
2 stops11h 24m
Delta
Thu 3/126:00 am
MDW
- GTF
2 stops12h 42m
Delta
Deal found 2/3![Delta logo]()
$699
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/252:30 pm
GTF
- ORD
1 stop5h 59m
United Airlines
Sun 3/292:35 pm
ORD
- GTF
1 stop7h 42m
United Airlines
Deal found 2/2![United Airlines logo]()
$428
One-way flights from Great Falls to IllinoisSearch for one-way flight options from Great Falls to Illinois. Find affordable one-way fares based on user searches. Data last updated February 4, 2026.
Search for one-way flight options from Great Falls to Illinois. Find affordable one-way fares based on user searches. Data last updated February 4, 2026.
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/151:15 pm
GTF
- ORD
1 stop7h 37m
Delta
Deal found 2/2![Delta logo]()
$214
This Delta deal was found by Cheapflights users on 2/3. 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.
Sat 2/75:25 am
GTF
- ORD
1 stop6h 19m
Delta
Deal found 2/3![Delta logo]()
$265
This Kiwi.com deal was found by Cheapflights users on 2/3. 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.
Sat 2/75:59 pm
GTF
- ORD
3 stops52h 51m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$600
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/156:25 am
GTF
- ORD
2 stops9h 40m
United Airlines
Deal found 2/2![United Airlines logo]()
$734
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/155:20 am
GTF
- MDW
2 stops9h 01m
Delta
Deal found 2/2![Delta logo]()
$740
Find flight deals from Great Falls to Illinois
Keep the following information in mind while searching for Great Falls to Illinois flight deals. Data was last updated February 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $298 (Alaska Airlines) |
One-way from | $214 (Delta) |
Good round-trip deal | $593 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Great Falls to Illinois 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 February 4, 2026.
Use the filters below to find and compare flights from Great Falls to Illinois that are best for you.
Fly from
Great Falls
Fly to
Illinois
Route
Depart
Return
Price
Great FallsChicago
GTF - ORD
GTFORD
Great Falls
Tue 3/10
4:57 pm-11:56 pm
1 stop29h 59m
Chicago O'Hare Intl
Thu 3/12
7:00 am-4:17 pm
1 stop10h 17m
$298
Great FallsChicago
GTF - ORD
GTFORD
Great Falls
Wed 2/18
2:25 pm-10:53 pm
1 stop7h 28m
Chicago O'Hare Intl
Sun 2/22
7:10 am-1:43 pm
1 stop7h 33m
$377
Great FallsChicago
GTF - ORD
GTFORD
Great Falls
Wed 2/18
6:20 pm-8:38 am
2 stops13h 18m
Chicago O'Hare Intl
Sun 2/22
7:15 am-12:30 pm
1 stop6h 15m
$422
Great FallsChicago
GTF - ORD
GTFORD
Great Falls
Wed 3/25
2:30 pm-9:29 pm
1 stop5h 59m
Chicago O'Hare Intl
Sun 3/29
2:35 pm-9:17 pm
1 stop7h 42m
$428
Great FallsChicago
GTF - ORD
GTFORD
Great Falls
Fri 2/20
1:15 pm-9:52 pm
1 stop7h 37m
Chicago O'Hare Intl
Fri 2/27
7:15 am-12:30 pm
1 stop6h 15m
$433
Great FallsChicago
GTF - ORD
GTFORD
Great Falls
Fri 2/13
2:25 pm-10:52 pm
1 stop7h 27m
Chicago O'Hare Intl
Tue 2/17
7:10 am-1:43 pm
1 stop7h 33m
$493
Great FallsChicago
GTF - ORD
GTFORD
Great Falls
Fri 2/20
4:57 pm-1:11 pm
2 stops19h 14m
Chicago O'Hare Intl
Fri 2/27
7:00 am-4:17 pm
1 stop10h 17m
$536
Great FallsChicago
GTF - ORD
GTFORD
Great Falls
Tue 2/17
2:25 pm-6:35 pm
2 stops27h 10m
Chicago O'Hare Intl
Mon 2/23
2:02 pm-9:33 pm
1 stop8h 31m
$543
Great FallsChicago
GTF - ORD
GTFORD
Great Falls
Tue 2/17
4:57 pm-11:56 pm
1 stop29h 59m
Chicago O'Hare Intl
Mon 2/23
7:00 am-4:17 pm
1 stop10h 17m
$544
Great FallsChicago
GTF - MDW
GTFMDW
Great Falls
Thu 7/9
6:20 pm-8:42 am
2 stops13h 22m
Chicago Midway
Mon 7/13
1:00 pm-10:44 pm
2 stops10h 44m
$647
Showing 1-10 of 19 results
Best time to book a flight from Great Falls to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Great Falls with our price prediction graph.
GTF-ORD
GTF-MDW
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 Great Falls to Illinois
GTF-USIL
GTF-ORD
GTF-MDW
No data available for this route at this time. Please check back soon.
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated February 4, 2026.
Read through reviews of airlines operating flights from Great Falls to Illinois, such as Delta and United Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Comfort
7.9
Entertainment
7.8
Crew
8.5
Food
7.2
Overall
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Boarding
8.1
Comfort
7.9
Entertainment
7.8
Crew
8.5
Food
7.2
Overall
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Boarding
8.1
Comfort
7.9
Entertainment
7.8
Crew
8.5
Food
7.2
Overall
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Related info for your journey
Find useful and relevant information for your journey from Great Falls to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
Alternative routes for Great Falls to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Great Falls to Illinois by cabin class
Find flights from Great Falls to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Great Falls and Illinois flights
Browse other Great Falls and Illinois flight options. Last updated on February 4, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Great Falls to Illinois flights
Consider these flights traveling from Great Falls to Illinois.
Top airline flying from Great Falls to Illinois
Discover the top airline that operate flights from Great Falls to Illinois. 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 February 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$277 | Average$591 | FlexibilityNo cancel fee | On-time69% |