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$64+ Cheap flights from Boston (BOS) 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 7/13. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — ORD
Jun 25 — Jul 21
Wed 6/25
Wed 7/2
1 adult, Economy
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Cheap flight deals from Boston to Illinois

Keep the following information in mind while searching for Boston to Illinois flight deals. Data was last updated June 20, 2025.

Round-trip from

$125
(Cheapflightsfares)

One-way from

$64
(Rumbo)

Popular in

March

Cheapest in

September

Average price

$222

Good round-trip deal

$146 or less

Good one-way deal

$111 or less
From Boston Logan Intl to Illinois
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One-way flight from Boston Logan Intl to Illinois
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Highest demand for flights based on searches. 9% potential increase in price ($23 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Boston Logan Intl to Illinois.
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Price to beat on a one-way flight from Boston Logan Intl to Illinois.
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Find flight deals from Boston to Illinois

Cheapest flights from Boston to Illinois
Explore the most affordable flight options available from Boston to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 20, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 6/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/158:39 pmBOS - ORD
1 stop13h 16mSpirit Airlines
Wed 7/2310:00 amORD - BOS
1 stop12h 03mSpirit Airlines
Deal found 6/19$125
This Southwest deal was found by Cheapflights users on 6/19. 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.
Tue 9/165:00 pmBOS - MDW
1 stop6h 25mSouthwest
Fri 9/196:45 pmMDW - BOS
Nonstop2h 20mSouthwest
Deal found 6/19$132
This Delta deal was found by Cheapflights users on 6/20. 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 7/17:20 amBOS - ORD
Nonstop2h 58mDelta
Fri 7/42:15 pmORD - BOS
Nonstop2h 39mDelta
Deal found 6/20$137
This American Airlines deal was found by Cheapflights users on 6/19. 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 8/137:00 amBOS - ORD
Nonstop3h 05mAmerican Airlines
Mon 8/186:15 amORD - BOS
Nonstop2h 28mAmerican Airlines
Deal found 6/19$140
This Southwest deal was found by Cheapflights users on 6/19. 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.
Sun 7/205:15 amBOS - ORD
1 stop7h 35mSouthwest
Wed 7/234:00 pmORD - BOS
1 stop6h 55mSouthwest
Deal found 6/19$142
This United Airlines deal was found by Cheapflights users on 6/18. 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 7/169:03 amBOS - ORD
Nonstop2h 51mUnited Airlines
Sat 7/197:45 pmORD - BOS
Nonstop2h 27mUnited Airlines
Deal found 6/18$150
This Priceline deal was found by Cheapflights users on 6/19. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/411:56 amBOS - ORD
1 stop12h 53mMultiple Airlines
Wed 7/910:00 amORD - BOS
1 stop8h 30mMultiple Airlines
Deal found 6/19$176
This JetBlue deal was found by Cheapflights users on 6/18. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/216:00 amBOS - ORD
Nonstop2h 55mJetBlue
Sat 7/269:40 amORD - BOS
Nonstop2h 29mJetBlue
Deal found 6/18$177
This Priceline deal was found by Cheapflights users on 6/18. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/279:40 amBOS - MDW
1 stop11h 37mFrontier
Sun 6/299:12 pmMDW - BOS
1 stop10h 28mFrontier
Deal found 6/18$200
This Frontier deal was found by Cheapflights users on 6/18. 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.
Sat 6/286:00 amBOS - ORD
1 stop14h 03mFrontier
Fri 7/43:48 pmORD - BOS
1 stop7h 55mFrontier
Deal found 6/18$200
This Mytrip deal was found by Cheapflights users on 6/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/19:01 amBOS - RFD
2 stops24h 11mMultiple Airlines
Sun 8/39:21 amRFD - BOS
1 stop5h 22mMultiple Airlines
Deal found 6/20$229
This American Airlines deal was found by Cheapflights users on 6/19. 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.
Mon 8/45:00 amBOS - MLI
1 stop6h 55mAmerican Airlines
Wed 8/611:21 amMLI - BOS
1 stop6h 22mAmerican Airlines
Deal found 6/19$255

Cheapflights Fare Finder

Customize your flight search to find flights from Boston 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 June 20, 2025.
Use the filters below to find and compare flights from Boston to Illinois that are best for you.

Fly from

Boston

Fly to

Illinois

Route

Depart

Return

Price

BostonChicago

BOS - ORD

BOSORD

Boston Logan Intl

Tue 7/15

8:39 pm-8:55 am

1 stop13h 16m

Chicago O'Hare Intl

Wed 7/23

10:00 am-11:03 pm

1 stop12h 03m

$125

BostonChicago

BOS - MDW

BOSMDW

Boston Logan Intl

Tue 9/16

5:00 pm-10:25 pm

1 stop6h 25m

Chicago Midway

Fri 9/19

6:45 pm-10:05 pm

Nonstop2h 20m

$132

BostonChicago

BOS - ORD

BOSORD

Boston Logan Intl

Tue 7/1

7:20 am-9:18 am

Nonstop2h 58m

Chicago O'Hare Intl

Tue 7/8

7:00 am-10:31 am

Nonstop2h 31m

$137

BostonChicago

BOS - ORD

BOSORD

Boston Logan Intl

Wed 8/13

7:00 am-9:05 am

Nonstop3h 05m

Chicago O'Hare Intl

Mon 8/18

6:15 am-9:43 am

Nonstop2h 28m

$140

BostonChicago

BOS - ORD

BOSORD

Boston Logan Intl

Sun 7/20

5:15 am-11:50 am

1 stop7h 35m

Chicago O'Hare Intl

Wed 7/23

4:00 pm-11:55 pm

1 stop6h 55m

$142

BostonChicago

BOS - ORD

BOSORD

Boston Logan Intl

Wed 7/16

9:03 am-10:54 am

Nonstop2h 51m

Chicago O'Hare Intl

Sat 7/19

7:45 pm-11:12 pm

Nonstop2h 27m

$150

BostonChicago

BOS - ORD

BOSORD

Boston Logan Intl

Wed 7/9

8:39 pm-8:55 am

1 stop13h 16m

Chicago O'Hare Intl

Sun 7/13

6:00 am-9:26 am

Nonstop2h 26m

$163

BostonChicago

BOS - ORD

BOSORD

Boston Logan Intl

Mon 7/21

6:00 am-7:55 am

Nonstop2h 55m

Chicago O'Hare Intl

Sat 7/26

9:40 am-1:09 pm

Nonstop2h 29m

$177

BostonChicago

BOS - RFD

BOSRFD

Boston Logan Intl

Fri 8/1

9:01 am-8:12 am

2 stops24h 11m

Chicago Greater Rockford

Sun 8/3

9:21 am-3:43 pm

1 stop5h 22m

$229

BostonMoline

BOS - MLI

BOSMLI

Boston Logan Intl

Mon 8/4

5:00 am-10:55 am

1 stop6h 55m

Moline Quad-City

Wed 8/6

11:21 am-6:43 pm

1 stop6h 22m

$255

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/19

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

Have a flexible travel schedule? Discover the best time to fly to Illinois from Boston 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 Boston to Illinois

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

Currently, August is the cheapest month in which you can book a flight from Boston to Illinois (average of $245). Flying from Boston 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 BOS to IL?

Find hourly flight availability from Boston 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 June 20, 2025.

When flying from Boston 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.

Weekly flight availability from Boston to Illinois

Explore weekly flight availability from Boston to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 20, 2025.

The most flights from BOS to USIL are scheduled on a Thursday (78 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (22 on average).

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 June 20, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest and Delta from Boston to Illinois by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Crew

8.5

Comfort

7.8

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Crew

8.5

Comfort

7.8

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
4,284 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Crew

8.5

Comfort

7.8

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
7,966 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Crew

8.5

Comfort

7.8

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
8,818 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
JetBlue
7.3
Good
2,922 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Entertainment

7.1

Boarding

8.1

Crew

8.5

Comfort

7.8

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 Boston to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Boston to Illinois?

    If you book a flight to Illinois from Boston, you will be flying from Logan Intl, which is the city’s only airport. Boston Logan Intl (BOS) is located 2.6 mi from the center of Boston.

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

    The cheapest airlines for a one-way flight from Boston to Illinois are JetBlue ($64), Spirit Airlines ($68), and Southwest ($69).

  • What are the most popular routes from Boston to Illinois?

    The most popular flight routes from Boston to Illinois are Boston Logan Intl - Chicago O'Hare Intl, Boston Logan Intl - Chicago Midway and Boston Logan Intl - Lambert-St Louis.

  • What are the most reliable airlines from Boston to Illinois?

    No one likes to see their flight delayed. When booking a flight from Boston to Illinois consider choosing Avianca (93%), TAP AIR PORTUGAL (92%) or Icelandair (91%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Boston to Illinois?

    While on average a flight from Boston to Illinois is generally $574, our data shows the cheapest flight currently is $68. When looking at the most popular route, (Boston Logan Intl - Chicago O'Hare Intl), you can expect to pay $112 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Boston 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 Boston to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Boston to Illinois (average of $245). Flying from Boston 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.

See more FAQs

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Alternative routes for Boston to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from Boston to Illinois

Discover the top 7 airlines that operate flights from Boston 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 June 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$39Average$107FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$79Average$202FlexibilityNo cancel feeOn-time62%
DeltaCheapest$93Average$366FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$97Average$449FlexibilityNo cancel feeOn-time69%
FrontierCheapest$100Average$120FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$126Average$304FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$137Average$426FlexibilityNo cancel feeOn-time71%

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