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Find cheap flights from Boston to Illinois from $49

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to Illinois departing on 5/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
火 6/4
火 6/11

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Best Illinois Flight Deals

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Chicago
Chicagononstop$57
Moline
Moline1 stop$316
Peoria
Peoria3 stops$362
Bloomington
Bloomington1 stop$582
Champaign
Champaign1 stop$356
Springfield
Springfield1 stop$410
Decatur
Decatur1 stop$344
Paducah
Paducah3 stops$363
St. Louis
St. Louis1 stop$149

Good to know

Low season

January

High season

October

Cheapest flight

$49
Best time to beat the crowds with an average 32% drop in price.
Most popular time to fly with an average 1% increase in price.
Flight from Boston to St. Louis

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Boston to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Boston to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Boston to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Illinois from Boston is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Boston to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Illinois with an airline and back to Boston with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Boston to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Illinois from Boston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding cheap flights to Illinois

  • Looking for a cheap flight? 25% of our users found tickets from Boston to the following destinations at these prices or less: Chicago $149 one-way - $267 round-trip
  • Morning departure is around 5% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

Top 5 airlines serving from Boston to Illinois

 
Need help choosing which airline to fly with from Boston to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 10826 reviews
8.2Boarding
8.0Entertainment
7.9Comfort
8.6Crew
7.4Food
Airline reviews

They did a fine job. Can't wait to use Delta in the future.

10.0 ExcellentRobert, Apr 2024BOS - RSW
Read more about Delta reviews

They did a fine job. Can't wait to use Delta in the future.

I usually have a positive experience with Delta. Complimentary upgrades are always nice!

Seats in first class on the E175 recline too far back. I was in 2A, and the man in 1A fully reclined almost the entire flight. It took 6-7 inches of space away from me and made it very difficult to work on my laptop.

Mario was great. Made a night flight on a small aircraft pleasant and memorable.

Crew were exceptional. Plane was quiet and quite empty, so I had a row to sleep across.

The seat could use more support or cushion. I'm in my 50's and have back issues so the seats are a bit hard for longer flights.

The plane was in bad condition. We were taxied for mode than an hour because a light panel had feel off. The bathroom in first class had broken panels as well. Overall poor aircraft maintenance

My only real complaint was how much turbulence there was-and that probably can't be avoided. I felt really sick getting off the plane. But boarding was super easy, the flight attendants were friendly, the bathroom was clean. Everything else about the flight was perfectly fine. Thanks!

Caroline (Supervisor) was great! Salute to the employees like her!

Boarding was good, staffs on the second flight to Korea was invisible all the time. Water was only offered 3 times during a 15 hours plus flight. It’s absolutely not enough for such a long flight!

The overall flight went well and the aircrew was pleasant.

Very comfortable Prem economy seats for a long haul flight. Had a problem with the tv that the crew fixed so was great!

Cathay Pacific seems to be an airline in trouble and on its way out. Lots of broken or poorly functioning things like entertainment screens, seats, and enough well trained staff to handle a full flight. Sad...

The flight crew was exceptionally good. Personal needs were well met. The food choices were very nice.

Excellent. Planes are a little older and could get some refurbishment, but besides that everything was excellent.

While I was in great pain, the seat was sufficiently comfortable to allow me to rest and not be in so much pain.

we were upgraded which was a blessing and tender mercy for us. I fell the day before and was in extreme pain from knee to shoulder. Sitting in a more comfortable seat during the flight was an unexpected blessing and experience.

Seats were very comfortable. Crew were excellent. Food very good.

Flight crew was especially thoughtful and attentive, made sure our seats were comfortable so we could rest on the long flight

I felt thirsty and asked the flight attendent for water, but no one came for more than half an hour.

I had back trouble prior to my flight and everyone was great about helping me.

My tv was broken on the flight which is disappointing when you pay for a seat and expect a service

Always delays from Boston to Salt lake but this time was very long. Don’t understand while they board the passengers and then make them sit in the plane

Service for food to our seat was a bit slow. Snack choices were just pretzels or baked chips. My seat cushion was not attached. Other than Barbie, video choice were not very good or current.

After we landed, we were held on the plane for 30 minutes. There was no one at the gate once we landed and we forced to sit on a plan that had already over an hour delayed.

almost 4 hour delay as they over booked and had to wait for 8-10 volunteers to agree to travel next day.

Old plane. No outlets for laptop or phone. Seats worn out. Area around seat dirty.

I loved the flight and the crew. It was comfortable and smooth.

The crew was openly hostile and condescending to the customers. They spent the majority of that time in the rear talking and seemed really agitated when people asked questions. I heard five different people told that the information they requested was in the handout or safety brief.

ticketing issues caused many customers to have to go back to check in after waiting in security, then go through security line again.

The CX617 from HK to BKK was delayed more than 1.5 hours.

This flight is frequently delayed. The connections seemingly are more frequently delayed. I’ve missed connections as a result twice on the same route to charlotte then Charleston. Final destination arrival has been the next day, twice in a row. No pilots, no crew. Too many excuses. Unfortunately, my days with American are over.

Entertainment was okay not because anything was wrong but it is a short flight so having no wifi is annoying but understandable. Crew was outstanding as usual

Those seats were way too narrow. I had the middle seat, one person was a very skinny person and we still couldn’t avoid touching each other anytime one of us moved. The other person was larger and we were basically sitting in each others lap the entire flight. There was zero entertainment. The flight was long enough to justify tvs, but no. Gotta sit there in your infant seat and twiddle your thumbs.

Flight was fine. It took an unusually long time to have baggage delivered to the carousel in ORD.

Average - flew with Jet Blue internal and it was far more comfortable and better food and entertainment. Notable difference

The flight got canceled due to mechanical issues, and he to be rebooked and missed my appointments for that day

The flight was scheduled to depart DCA at 12:30 pm but was delayed twice on the ground so that we were finally scheduled to depart at around 4:00 pm. Once we boarded, it was announced that takeoff would be delayed again to fix a hydraulic problem which delayed our eventual takeoff until around 5:00 pm. Once we departed, it was a smooth flight back to ORD. We did not get any explanation about what caused the original significant delay. In my experience, this happens frequently with AA.

The only problem experienced was a ground stop in Chicago due to weather. But the crew handled everything professionally. They prioritized rebooking those passengers who had connecting flights and then deplaning the other passengers. When the hold was lifted, they efficiently re-boarded all the passengers so that we could depart before our departure limit expired.

Our second leg to Jackson WY was unable to land due to weather. We were flown back to Dallas after stopping in SLC. We were given hotel rooms and vouchers. We were told that we would be back on the same plane in the morning. Instead we were given a different flight with different seats. Not a good experience. No one knew what was going on.

The seat are terrible. Don’t even think of sleeping on a Spirit flight. The kids that run the plane aka flight attendants are pretty rude and straight forward. They get the job done but without class.

I had a death in my family and booked my flight on Spirit. My flight was cancelled the morning of my flight, no explanation, no help to rebook, nobody to talk to. The next available flight was 2days later !!!! Terrible airline, will NEVER fly with them again!

They took a horrible route with a lot of turbulence and I eneded up getting sick. Even if the flight takes longer. Don't put people life at risk just to get to the airport on time.

Every thing was fine ,low price,easy on time ,clean, good staff, really no issues

Had to board plan 2x due to lack of security check after 1st boarding

Miserable. The crew was rude, the flight was delayed 5 hours for mechanical reasons and then “weather” even though other planes were leaving.

They kept Changing the flight times. It was delayed several times and at one point it was supposed to depart at 3.40am! At which point we ended up staying overnight and booked long a separate United flight for early morning departure. The spirit flight then got moved up and left at 1.30 in the morning when it was supposed to leave at 9.40pm the night before.

Flight was delayed...not horribly late. Just before push back engine shut down for a quick replacement item that took about five minutes. After that, everything was smooth and the pilot was able to make up time in the air so that our arrival time was not too far off the original anticipated arrival time.

The flight was delayed almost two hours on the front end, and an hour on the backend once we landed and waited for a gate to open up. We were told to remain in our seats during that whole delay and I had to go to the bathroom badly. I was unable to hold it and was forced to urinate in my pants while in my seat. I then had to sit in it until we finally deboarded and I was able to change my clothes.

We waited an hour to get off of the plane

Book cheap flights from Boston to Illinois

Recent round-trip flight deals

6/12
nonstopSpirit Airlines
2h 54mBOS-ORD
6/15
nonstopSpirit Airlines
2h 29mORD-BOS
$57
6/6
nonstopSpirit Airlines
2h 54mBOS-ORD
6/11
nonstopSpirit Airlines
2h 28mORD-BOS
$61
5/29
nonstopUnited Airlines
2h 50mBOS-ORD
6/5
nonstopUnited Airlines
2h 20mORD-BOS
$147
5/22
nonstopDelta
2h 55mBOS-ORD
5/31
nonstopDelta
2h 36mORD-BOS
$163
5/26
nonstopJetBlue
2h 54mBOS-ORD
5/30
nonstopJetBlue
2h 26mORD-BOS
$167
5/23
nonstopDelta
2h 55mBOS-ORD
5/29
nonstopDelta
2h 27mORD-BOS
$178
6/4
nonstopJetBlue
2h 54mBOS-ORD
6/7
nonstopJetBlue
2h 26mORD-BOS
$183
5/22
nonstopAmerican Airlines
2h 56mBOS-ORD
5/29
nonstopAmerican Airlines
2h 26mORD-BOS
$184
5/28
nonstopAmerican Airlines
3h 04mBOS-ORD
5/30
1 stopAmerican Airlines
4h 44mORD-BOS
$196
5/15
1 stopUnited Airlines
4h 54mBOS-ORD
5/17
nonstopUnited Airlines
2h 21mORD-BOS
$217

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Recent one-way flight deals

5/18
1 stopFrontier
7h 36mBOS-STL
$49
5/22
1 stopFrontier
6h 50mBOS-MDW
$49
6/5
2 stopsSpirit Airlines
26h 43mBOS-STL
$65
5/13
2 stopsSpirit Airlines
19h 01mBOS-STL
$80
6/3
nonstopJetBlue
2h 54mBOS-ORD
$95
5/12
nonstopJetBlue
2h 54mBOS-ORD
$99
5/25
nonstopAmerican Airlines
3h 13mBOS-ORD
$114
8/3
1 stopAmerican Airlines
5h 05mBOS-ORD
$128
5/11
nonstopDelta
2h 52mBOS-ORD
$134
11/1
1 stopDelta
4h 55mBOS-STL
$147

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Last minute flights from Boston to Illinois

Last minute flight, train and bus deals

5/10
multi-stopFrontier
15h 35mBOS-ORD
5/15
multi-stopFrontier
24h 01mORD-BOS
$152
5/8
multi-stopSpirit Airlines
18h 16mBOS-ORD
5/14
multi-stopSpirit Airlines
11h 49mORD-BOS
$170
5/10
nonstopJetBlue
2h 54mBOS-ORD
5/14
nonstopJetBlue
2h 26mORD-BOS
$239
5/10
nonstopJetBlue
2h 54mBOS-ORD
5/10
nonstopJetBlue
2h 26mORD-BOS
$259
5/6
nonstopAmerican Airlines
2h 59mBOS-ORD
5/11
nonstopAmerican Airlines
2h 17mORD-BOS
$287
5/10
multi-stopAmerican Airlines
5h 34mBOS-ORD
5/11
nonstopAmerican Airlines
2h 26mORD-BOS
$291
5/10
multi-stopDelta
5h 13mBOS-ORD
5/14
nonstopDelta
2h 36mORD-BOS
$292
5/6
multi-stopDelta
7h 59mBOS-ORD
5/11
nonstopDelta
2h 31mORD-BOS
$296
5/8
multi-stopUnited Airlines
6h 00mBOS-ORD
5/12
nonstopUnited Airlines
2h 23mORD-BOS
$300
5/10
nonstopUnited Airlines
2h 52mBOS-ORD
5/12
nonstopUnited Airlines
2h 23mORD-BOS
$379

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Boston - Illinois Flights

Departure:

Boston (BOS)United States

Return flight deals:

Illinois - Boston

Cabin classes:

$568
$504
$426
$146