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$37+ Cheap flights from Montana 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 6/15. Fares are subject to change and may not be available on all flights or dates of travel.
BZN — ORD
May 5 — May 121
Mon 5/5
Mon 5/12
1 adult, Economy
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Cheap flight deals from Montana to Illinois

Keep the following information in mind while searching for Montana to Illinois flight deals. Data was last updated April 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$209
(American Airlines)

One-way from

$37
(Vakatrip)

Popular in

November

Cheapest in

January

Average price

$509

Good round-trip deal

$376 or less

Good one-way deal

$180 or less
Provider with most accurate pricing for Bozeman Gallatin Field-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Bozeman Gallatin Field-Chicago (CHI) flights.
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From Montana to Illinois
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One-way flight from Montana to Illinois
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Highest demand for flights based on searches. 11% potential increase in price ($57 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Montana to Illinois.
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Price to beat on a one-way flight from Montana to Illinois.
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Find flight deals from Montana to Illinois

Cheapest flights from Montana to Illinois
Explore the most affordable flight options available from Montana to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 30, 2025.

This American Airlines deal was found by Cheapflights users on 4/28. 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.
Fri 9/53:22 pmBZN - ORD
Nonstop3h 13mAmerican Airlines
Sun 9/1410:30 amORD - BZN
Nonstop3h 14mAmerican Airlines
Deal found 4/28$197
This American Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1412:28 pmBIL - ORD
Nonstop2h 51mAmerican Airlines
Sun 8/179:55 amORD - BIL
Nonstop3h 03mAmerican Airlines
Deal found 4/28$209
This American Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/254:53 pmFCA - ORD
Nonstop3h 24mAmerican Airlines
Mon 9/299:56 amORD - FCA
Nonstop3h 39mAmerican Airlines
Deal found 4/28$211
This United Airlines deal was found by Cheapflights users on 4/28. 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 6/55:44 pmBZN - ORD
1 stop5h 41mUnited Airlines
Mon 6/99:07 amORD - BZN
Nonstop3h 27mUnited Airlines
Deal found 4/28$221
This flugladen.de deal was found by Cheapflights users on 4/28. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/52:45 pmBZN - ORD
1 stop8h 11mAlaska Airlines
Sun 6/86:00 amORD - BZN
1 stop10h 05mAlaska Airlines
Deal found 4/28$224
This Hawaiian Airlines deal was found by Cheapflights users on 4/28. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/292:45 pmBZN - ORD
1 stop8h 11mHawaiian Airlines
Wed 6/46:00 amORD - BZN
1 stop10h 05mHawaiian Airlines
Deal found 4/28$229
This United Airlines deal was found by Cheapflights users on 4/29. 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 6/132:23 pmMSO - ORD
1 stop7h 18mUnited Airlines
Sun 6/159:02 amORD - MSO
Nonstop3h 48mUnited Airlines
Deal found 4/29$230
This Delta deal was found by Cheapflights users on 4/28. 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 8/166:25 amBIL - ORD
1 stop7h 34mDelta
Wed 8/201:35 pmORD - BIL
2 stops10h 03mDelta
Deal found 4/28$234
This American Airlines deal was found by Cheapflights users on 4/29. 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.
Wed 7/165:05 amMSO - ORD
Nonstop3h 24mAmerican Airlines
Sun 7/208:34 pmORD - MSO
Nonstop3h 55mAmerican Airlines
Deal found 4/29$235
This Delta deal was found by Cheapflights users on 4/28. 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 6/56:10 amBZN - MDW
1 stop6h 05mDelta
Mon 6/97:21 pmMDW - BZN
1 stop5h 35mDelta
Deal found 4/28$237
This Delta deal was found by Cheapflights users on 4/29. 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 6/611:30 amBZN - ORD
1 stop5h 50mDelta
Mon 6/98:29 amORD - BZN
1 stop7h 01mDelta
Deal found 4/29$237
This Delta deal was found by Cheapflights users on 4/29. 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 6/121:08 pmMSO - ORD
1 stop8h 01mDelta
Sun 6/155:35 amORD - MSO
2 stops9h 57mDelta
Deal found 4/29$245

Cheapflights Fare Finder

Customize your flight search to find flights from Montana 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 April 30, 2025.
Use the filters below to find and compare flights from Montana to Illinois that are best for you.

Fly from

Montana

Fly to

Illinois

Route

Depart

Return

Price

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Thu 8/14

12:28 pm-4:19 pm

Nonstop2h 51m

Chicago O'Hare Intl

Sun 8/17

9:55 am-11:58 am

Nonstop3h 03m

$209

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 7/17

4:30 pm-8:40 pm

Nonstop3h 10m

Chicago O'Hare Intl

Mon 7/21

1:10 pm-3:27 pm

Nonstop3h 17m

$211

KalispellChicago

FCA - ORD

FCAORD

Kalispell Glacier Park

Thu 9/25

4:53 pm-9:17 pm

Nonstop3h 24m

Chicago O'Hare Intl

Mon 9/29

9:56 am-12:35 pm

Nonstop3h 39m

$211

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 6/5

5:44 pm-12:25 am

1 stop5h 41m

Chicago O'Hare Intl

Mon 6/9

9:07 am-11:34 am

Nonstop3h 27m

$221

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 6/5

2:45 pm-11:56 pm

1 stop8h 11m

Chicago O'Hare Intl

Sun 6/8

6:00 am-3:05 pm

1 stop10h 05m

$224

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Thu 5/29

2:45 pm-11:56 pm

1 stop8h 11m

Chicago O'Hare Intl

Wed 6/4

6:00 am-3:05 pm

1 stop10h 05m

$229

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Sat 8/16

6:25 am-2:59 pm

1 stop7h 34m

Chicago O'Hare Intl

Wed 8/20

1:35 pm-10:38 pm

2 stops10h 03m

$234

MissoulaChicago

MSO - ORD

MSOORD

Missoula Johnson-Bell Field

Wed 7/16

5:05 am-9:29 am

Nonstop3h 24m

Chicago O'Hare Intl

Sun 7/20

8:34 pm-11:29 pm

Nonstop3h 55m

$235

BozemanChicago

BZN - MDW

BZNMDW

Bozeman Gallatin Field

Thu 6/5

6:10 am-1:15 pm

1 stop6h 05m

Chicago Midway

Mon 6/9

7:21 pm-11:56 pm

1 stop5h 35m

$237

BozemanChicago

BZN - ORD

BZNORD

Bozeman Gallatin Field

Fri 6/6

11:30 am-6:20 pm

1 stop5h 50m

Chicago O'Hare Intl

Mon 6/9

8:29 am-2:30 pm

1 stop7h 01m

$237

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 60 results
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Best time to book a flight from Montana to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Montana with our price prediction graph.
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 Montana to Illinois

What is the cheapest month to book a flight from Montana to Illinois?

Currently, August is the cheapest month in which you can book a flight from Montana to Illinois (average of $245). Flying from Montana to Illinois in March is currently the most expensive (average of $321). 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 MT to IL?

Find hourly flight availability from Montana to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 30, 2025.

When flying from Montana to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 April 30, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Montana to Illinois to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,961 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,961 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,295 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,929 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,405 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Crew

8.5

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from Montana to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from Montana to Illinois one-way?

    The cheapest airline one-way is Alaska Airlines, with whom users have recently found tickets for as low as $37. However, be on the lookout for offers from Hawaiian Airlines and Southwest, as they are both options that can get you from Montana to Illinois for a low price.

  • Can I find deals for flights from Montana to Illinois that include hotel bookings?

    Yes. In addition to deals on Montana to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Montana to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Montana to Illinois.

  • Can I find deals for business class flights from Montana to Illinois?

    Yes. Cheapflights offers flight deals from Montana to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Montana to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Montana to Illinois (average of $245). Flying from Montana to Illinois in March is currently the most expensive (average of $321). 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.

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Alternative routes for Montana to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Montana to Illinois

Discover the top 5 airlines that operate flights from Montana 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 April 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$205Average$458FlexibilityNo cancel feeOn-time75%
DeltaCheapest$216Average$424FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$229Average$483FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$238Average$521FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$388Average$418FlexibilityNo cancel feeOn-time63%

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