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Cheap flights from Illinois to West Yellowstone from $397

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to West Yellowstone departing on 10/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Illinois to West Yellowstone

Cheap round-trip flights

Logo
6:00 am - 1:20 pmORD-WYS
8h 20m1 stop
Logo
1:55 pm - 11:59 pmWYS-ORD
9h 04m1 stop
$437
Find Deal
Mon, Sep 29 - Mon, Oct 6
United Airlines Logo
8:49 am - 1:15 pmORD-WYS
5h 26m1 stop
United Airlines Logo
1:51 pm - 6:55 pmWYS-ORD
28h 04m2 stops
$621United Airlines
Find Deal
Mon, Sep 15 - Fri, Sep 19
United Airlines Logo
9:40 pm - 1:20 pmORD-WYS
16h 40m2 stops
United Airlines Logo
1:55 pm - 1:13 pmWYS-ORD
22h 18m2 stops
$624United Airlines
Find Deal
Mon, Sep 29 - Mon, Oct 6
United Airlines Logo
8:00 pm - 1:20 pmORD-WYS
18h 20m2 stops
United Airlines Logo
1:55 pm - 7:43 amWYS-ORD
16h 48m2 stops
$1,344United Airlines
Find Deal
Sat, Sep 27 - Sat, Oct 4

United Airlines flights from Illinois to West Yellowstone

Our best United Airlines deals on Illinois to West Yellowstone flight tickets
United Airlines
Sep 15
ORD8:49 amChicago O'Hare Intl
5h 26m
1 stop
WYS1:15 pmWest Yellowstone
Sep 19
WYS1:51 pmWest Yellowstone
28h 04m
2 stops
ORD6:55 pmChicago O'Hare Intl
$621
Find similar
United Airlines
Sep 29
ORD9:40 pmChicago O'Hare Intl
16h 40m
2 stops
WYS1:20 pmWest Yellowstone
Oct 6
WYS1:55 pmWest Yellowstone
22h 18m
2 stops
ORD1:13 pmChicago O'Hare Intl
$624
Find similar
United Airlines
Sep 15
ORD8:49 amChicago O'Hare Intl
5h 26m
1 stop
WYS1:15 pmWest Yellowstone
Sep 19
WYS1:51 pmWest Yellowstone
7h 51m
1 stop
ORD10:42 pmChicago O'Hare Intl
$660
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated September 1, 2025.
Use the filters below to find and compare flights from Illinois to West Yellowstone that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoWest Yellowstone

ORD - WYS

ORDWYS

Chicago O'Hare Intl

Mon 9/29

6:00 am-1:20 pm

1 stop8h 20m

West Yellowstone

Mon 10/6

1:55 pm-11:59 pm

1 stop9h 04m

$437

ChicagoWest Yellowstone

ORD - WYS

ORDWYS

Chicago O'Hare Intl

Mon 9/15

8:49 am-1:15 pm

1 stop5h 26m

West Yellowstone

Fri 9/19

1:51 pm-6:55 pm

2 stops28h 04m

$621

ChicagoWest Yellowstone

ORD - WYS

ORDWYS

Chicago O'Hare Intl

Mon 9/29

9:40 pm-1:20 pm

2 stops16h 40m

West Yellowstone

Mon 10/6

1:55 pm-1:13 pm

2 stops22h 18m

$624

ChicagoWest Yellowstone

ORD - WYS

ORDWYS

Chicago O'Hare Intl

Sat 9/27

8:00 pm-1:20 pm

2 stops18h 20m

West Yellowstone

Sat 10/4

1:55 pm-7:43 am

2 stops16h 48m

$1,344

St. LouisWest Yellowstone

STL - WYS

STLWYS

Lambert-St Louis

Fri 10/10

5:15 am-1:20 pm

1 stop9h 05m

$397

St. LouisWest Yellowstone

STL - WYS

STLWYS

Lambert-St Louis

Fri 10/10

5:28 pm-1:20 pm

2 stops20h 52m

$411

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to West Yellowstone from

How to get the cheapest flight ticket from Illinois to West Yellowstone

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to West Yellowstone?

The cheapest day to depart from Illinois to West Yellowstone is on a Wednesday when prices can be found for as low as $413. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to West Yellowstone for around $853.

Cheap Illinois to West Yellowstone flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to West Yellowstone

Direct flights

None
There are no direct flights from Illinois to West Yellowstone. There are no popular flight routes from Illinois to West Yellowstone.
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  • When did momondo last update prices for flights from Illinois to West Yellowstone Airport?

    Prices for flights from Illinois to West Yellowstone Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Illinois to West Yellowstone Airport?

  • How old do you have to be to fly from Illinois to West Yellowstone Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to West Yellowstone Airport.

  • What documentation or ID do you need to fly to West Yellowstone Airport?

    The travel and health documents required for your trip to West Yellowstone Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at West Yellowstone Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Illinois to West Yellowstone

Compare and see reviews for airlines that fly from Illinois to West Yellowstone with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $410Free CancellationRating
7.4
8,936 reviews
Search United Airlines flights

Traveling to a place near West Yellowstone?

Book flights to West Yellowstone if you plan to visit one of these locations
Yellowstone National Park
Island Park
Gardiner

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to West Yellowstone?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to West Yellowstone from Illinois.

Can I find flights from Illinois to West Yellowstone with flexible booking policies on momondo?

Flights from Illinois to West Yellowstone with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Illinois to West Yellowstone?

Once all potential Illinois to West Yellowstone flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Illinois to West Yellowstone right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Illinois to West Yellowstone flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your West Yellowstone trip

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