$210+ Cheap flights from Illinois to West Yellowstone (WYS)
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 7/2. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — WYS
Mar 6 — Mar 131
1 adult, Economy
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Find cheap flights from Illinois to West Yellowstone 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
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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 Illinois to West Yellowstone
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Best
One-way
Cheapest flights from Illinois to West YellowstoneExplore the most affordable flight options available from Illinois to West Yellowstone. 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 Illinois to West Yellowstone. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 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 7/127:15 am
ORD
- WYS
1 stop6h 06m
Delta
Fri 7/171:09 pm
WYS
- ORD
1 stop7h 49m
Delta
Deal found 2/2![Delta logo]()
$242
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.
Mon 7/137:15 am
ORD
- WYS
1 stop6h 06m
Delta
Fri 7/171:09 pm
WYS
- ORD
1 stop7h 49m
Delta
Deal found 2/2![Delta logo]()
$273
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:00 am
ORD
- WYS
1 stop8h 20m
United Airlines
Sat 9/125:45 pm
WYS
- ORD
1 stop5h 12m
United Airlines
Deal found 2/1![United Airlines logo]()
$323
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 7/127:15 am
ORD
- WYS
1 stop6h 06m
Delta
Thu 7/231:09 pm
WYS
- ORD
1 stop7h 49m
Delta
Deal found 2/2![Delta logo]()
$373
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.
Mon 7/137:15 am
ORD
- WYS
1 stop6h 06m
Delta
Thu 7/231:09 pm
WYS
- ORD
1 stop7h 49m
Delta
Deal found 2/2![Delta logo]()
$384
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.
Sat 7/111:35 pm
ORD
- WYS
2 stops23h 46m
Delta
Fri 7/171:09 pm
WYS
- ORD
1 stop7h 49m
Delta
Deal found 2/2![Delta logo]()
$400
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.
Sat 6/66:00 am
ORD
- WYS
1 stop8h 20m
United Airlines
Fri 6/125:45 pm
WYS
- ORD
1 stop5h 59m
United Airlines
Deal found 2/3![United Airlines logo]()
$403
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 6/36:00 am
ORD
- WYS
1 stop8h 20m
United Airlines
Wed 6/172:02 pm
WYS
- ORD
1 stop7h 42m
United Airlines
Deal found 2/3![United Airlines logo]()
$404
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 7/127:15 am
ORD
- WYS
1 stop6h 06m
Delta
Mon 7/201:09 pm
WYS
- ORD
2 stops22h 00m
Delta
Deal found 2/2![Delta logo]()
$415
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.
Mon 7/137:15 am
ORD
- WYS
1 stop6h 06m
Delta
Mon 7/201:09 pm
WYS
- ORD
2 stops22h 00m
Delta
Deal found 2/2![Delta logo]()
$426
This United Airlines deal was found by Cheapflights users on 2/4. 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.
Fri 5/229:39 pm
ORD
- WYS
1 stop19h 28m
United Airlines
Sun 5/315:45 pm
WYS
- ORD
1 stop5h 59m
United Airlines
Deal found 2/4![United Airlines logo]()
$434
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.
Sat 7/111:00 pm
MDW
- WYS
2 stops24h 21m
Delta
Mon 7/201:09 pm
WYS
- MDW
2 stops19h 42m
Delta
Deal found 2/2![Delta logo]()
$568
Best flights from Illinois to West YellowstoneDiscover carefully curated flight deals from Illinois to West Yellowstone 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 Illinois to West Yellowstone that have cost, travel time, and layovers in mind to ensure you get the best travel experience. 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.
Tue 7/147:15 am
ORD
- WYS
1 stop6h 06m
Delta
Fri 7/171:09 pm
WYS
- ORD
1 stop7h 49m
Delta
Deal found 2/2![Delta logo]()
$242
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 7/147:00 am
ORD
- WYS
1 stop7h 20m
United Airlines
Wed 7/222:02 pm
WYS
- ORD
1 stop8h 17m
United Airlines
Deal found 2/2![United Airlines logo]()
$403
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.
Mon 7/206:00 am
ORD
- WYS
1 stop8h 20m
United Airlines
Fri 7/315:45 pm
WYS
- ORD
1 stop5h 59m
United Airlines
Deal found 2/2![United Airlines logo]()
$403
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 7/57:15 am
ORD
- WYS
1 stop6h 06m
Delta
Mon 7/131:09 pm
WYS
- ORD
2 stops22h 00m
Delta
Deal found 2/2![Delta logo]()
$426
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 7/57:15 am
ORD
- WYS
1 stop6h 06m
Delta
Thu 7/161:09 pm
WYS
- ORD
2 stops19h 55m
Delta
Deal found 2/2![Delta logo]()
$426
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.
Fri 5/2210:55 pm
ORD
- WYS
1 stop18h 12m
United Airlines
Sun 5/315:45 pm
WYS
- ORD
1 stop5h 59m
United Airlines
Deal found 2/2![United Airlines logo]()
$434
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 7/195:00 am
ORD
- WYS
1 stop12h 07m
United Airlines
Fri 7/315:45 pm
WYS
- ORD
1 stop5h 59m
United Airlines
Deal found 2/2![United Airlines logo]()
$434
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.
Wed 7/87:15 am
ORD
- WYS
1 stop6h 06m
Delta
Mon 7/131:09 pm
WYS
- ORD
1 stop7h 49m
Delta
Deal found 2/2![Delta logo]()
$453
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.
Sat 7/46:00 am
ORD
- WYS
1 stop8h 20m
United Airlines
Sat 7/115:45 pm
WYS
- ORD
1 stop5h 59m
United Airlines
Deal found 2/2![United Airlines logo]()
$460
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 7/229:15 pm
ORD
- WYS
2 stops17h 05m
United Airlines
Fri 7/315:45 pm
WYS
- ORD
1 stop5h 59m
United Airlines
Deal found 2/2![United Airlines logo]()
$478
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 7/231:00 pm
MDW
- WYS
2 stops24h 21m
Delta
Wed 7/291:09 pm
WYS
- MDW
2 stops19h 42m
Delta
Deal found 2/2![Delta logo]()
$568
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.
Thu 7/96:00 am
ORD
- WYS
1 stop8h 20m
United Airlines
Wed 7/152:02 pm
WYS
- ORD
1 stop7h 42m
United Airlines
Deal found 2/2![United Airlines logo]()
$484
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.
Sat 7/115:59 pm
MDW
- WYS
2 stops19h 22m
Delta
Tue 7/211:09 pm
WYS
- MDW
2 stops21h 47m
Delta
Deal found 2/2![Delta logo]()
$568
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.
Mon 7/135:59 pm
MDW
- WYS
2 stops19h 22m
Delta
Tue 7/211:09 pm
WYS
- MDW
2 stops21h 47m
Delta
Deal found 2/2![Delta logo]()
$568
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 7/171:00 pm
MDW
- WYS
2 stops22h 41m
Delta
Tue 7/211:09 pm
WYS
- MDW
2 stops21h 47m
Delta
Deal found 2/2![Delta logo]()
$568
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.
Mon 7/135:59 pm
MDW
- WYS
2 stops19h 22m
Delta
Mon 7/201:09 pm
WYS
- MDW
2 stops19h 42m
Delta
Deal found 2/2![Delta logo]()
$568
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 7/175:59 pm
MDW
- WYS
2 stops17h 42m
Delta
Mon 7/201:09 pm
WYS
- MDW
2 stops21h 47m
Delta
Deal found 2/2![Delta logo]()
$568
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 7/34:50 pm
STL
- WYS
1 stop21h 30m
United Airlines
Tue 7/72:02 pm
WYS
- STL
1 stop5h 40m
United Airlines
Deal found 2/3![United Airlines logo]()
$755
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.
Sat 7/181:00 pm
MDW
- WYS
2 stops24h 21m
Delta
Wed 7/291:09 pm
WYS
- MDW
2 stops19h 42m
Delta
Deal found 2/2![Delta logo]()
$568
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 7/75:59 pm
MDW
- WYS
2 stops19h 22m
Delta
Mon 7/131:09 pm
WYS
- MDW
2 stops19h 42m
Delta
Deal found 2/2![Delta logo]()
$574
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 7/149:06 am
STL
- WYS
1 stop5h 14m
United Airlines
Fri 7/172:02 pm
WYS
- STL
1 stop25h 32m
United Airlines
Deal found 2/3![United Airlines logo]()
$794
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 7/71:00 pm
MDW
- WYS
2 stops24h 21m
Delta
Thu 7/161:09 pm
WYS
- MDW
2 stops19h 42m
Delta
Deal found 2/2![Delta logo]()
$574
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.
Sat 7/189:30 am
MDW
- WYS
2 stops27h 51m
Delta
Mon 7/271:09 pm
WYS
- MDW
2 stops19h 42m
Delta
Deal found 2/2![Delta logo]()
$594
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.
Sat 7/45:59 pm
MDW
- WYS
2 stops19h 22m
Delta
Mon 7/131:09 pm
WYS
- MDW
2 stops21h 47m
Delta
Deal found 2/2![Delta logo]()
$594
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.
Sat 7/45:59 pm
MDW
- WYS
2 stops19h 22m
Delta
Thu 7/161:09 pm
WYS
- MDW
2 stops19h 42m
Delta
Deal found 2/2![Delta logo]()
$594
One-way flights from Illinois to West YellowstoneSearch for one-way flight options from Illinois to West Yellowstone. Find affordable one-way fares based on user searches. Data last updated February 4, 2026.
Search for one-way flight options from Illinois to West Yellowstone. Find affordable one-way fares based on user searches. Data last updated February 4, 2026.
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.
Thu 7/26:00 am
ORD
- WYS
1 stop8h 20m
United Airlines
Deal found 2/2![United Airlines logo]()
$210
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 5/67:00 am
ORD
- WYS
1 stop7h 28m
United Airlines
Deal found 2/2![United Airlines logo]()
$310
Find flight deals from Illinois to West Yellowstone
Keep the following information in mind while searching for Illinois to West Yellowstone flight deals. Data was last updated February 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $242 (Delta) |
One-way from | $210 (United Airlines) |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to West Yellowstone 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 Illinois to West Yellowstone that are best for you.
Fly from
Illinois
Fly to
West Yellowstone
Route
Depart
Return
Price
ChicagoWest Yellowstone
ORD - WYS
ORDWYS
Chicago O'Hare Intl
Tue 7/14
7:15 am-12:21 pm
1 stop6h 06m
West Yellowstone
Fri 7/17
1:09 pm-9:58 pm
1 stop7h 49m
$242
ChicagoWest Yellowstone
ORD - WYS
ORDWYS
Chicago O'Hare Intl
Tue 7/14
7:00 am-1:20 pm
1 stop7h 20m
West Yellowstone
Wed 7/22
2:02 pm-11:19 pm
1 stop8h 17m
$403
ChicagoWest Yellowstone
ORD - WYS
ORDWYS
Chicago O'Hare Intl
Mon 7/20
6:00 am-1:20 pm
1 stop8h 20m
West Yellowstone
Fri 7/31
5:45 pm-12:44 am
1 stop5h 59m
$403
ChicagoWest Yellowstone
ORD - WYS
ORDWYS
Chicago O'Hare Intl
Sun 7/5
7:15 am-12:21 pm
1 stop6h 06m
West Yellowstone
Mon 7/13
1:09 pm-12:09 pm
2 stops22h 00m
$426
ChicagoWest Yellowstone
ORD - WYS
ORDWYS
Chicago O'Hare Intl
Sun 7/5
7:15 am-12:21 pm
1 stop6h 06m
West Yellowstone
Thu 7/16
1:09 pm-10:04 am
2 stops19h 55m
$426
ChicagoWest Yellowstone
ORD - WYS
ORDWYS
Chicago O'Hare Intl
Fri 5/22
10:55 pm-4:07 pm
1 stop18h 12m
West Yellowstone
Sun 5/31
5:45 pm-12:44 am
1 stop5h 59m
$434
ChicagoWest Yellowstone
ORD - WYS
ORDWYS
Chicago O'Hare Intl
Sun 7/19
5:00 am-4:07 pm
1 stop12h 07m
West Yellowstone
Fri 7/31
5:45 pm-12:44 am
1 stop5h 59m
$434
ChicagoWest Yellowstone
ORD - WYS
ORDWYS
Chicago O'Hare Intl
Wed 7/8
7:15 am-12:21 pm
1 stop6h 06m
West Yellowstone
Mon 7/13
1:09 pm-9:58 pm
1 stop7h 49m
$453
ChicagoWest Yellowstone
ORD - WYS
ORDWYS
Chicago O'Hare Intl
Sat 7/4
6:00 am-1:20 pm
1 stop8h 20m
West Yellowstone
Sat 7/11
5:45 pm-12:44 am
1 stop5h 59m
$460
ChicagoWest Yellowstone
ORD - WYS
ORDWYS
Chicago O'Hare Intl
Wed 7/22
9:15 pm-1:20 pm
2 stops17h 05m
West Yellowstone
Fri 7/31
5:45 pm-12:44 am
1 stop5h 59m
$478
Showing 1-10 of 27 results
Best time to book a flight from Illinois to West Yellowstone
Have a flexible travel schedule? Discover the best time to fly to West Yellowstone from Illinois with our price prediction graph.
ORD-WYS
MDW-WYS
STL-WYS
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 West Yellowstone
USIL-WYS
ORD-WYS
MDW-WYS
STL-WYS
What is the cheapest month to book a flight from Illinois to West Yellowstone?
Currently, October is the cheapest month in which you can book a flight from Illinois to West Yellowstone (average of $190). Flying from Illinois to West Yellowstone in March is currently the most expensive (average of $289). 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.
Related info for your journey
Find useful and relevant information for your journey from Illinois to West Yellowstone. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near West Yellowstone?
Book flights to West Yellowstone if you plan to visit one of these locationsIsland Park
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Illinois and West Yellowstone flights
Browse other Illinois and West Yellowstone flight options. Last updated on February 4, 2026.
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Illinois to West Yellowstone flights
Consider these flights traveling from Illinois to West Yellowstone.
Top airline flying from Illinois to West Yellowstone
Discover the top airline that operate flights from Illinois to West Yellowstone. 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$410 | Average$710 | FlexibilityNo cancel fee | On-time69% |