United's Economy Plus offers extra legroom, ideal for comfort on short flights.
United's MileagePlus allows pooling miles, useful for family travel.

Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $117 (Delta) |
One-way from | $59 (Delta) |
Popular in | April |
Cheapest in | September |
Average price | $252 |
Good round-trip deal | $131 or less |
Good one-way deal | $65 or less |
Fly from
Fly to
Route
Depart
Return
Price
ChicagoBoston
ORD - BOS
ORDBOS
Chicago O'Hare Intl
Fri 1/23
2:25 pm-5:54 pm
Nonstop2h 29m
Boston Logan Intl
Thu 1/29
7:30 am-9:41 am
Nonstop3h 11m
ChicagoBoston
MDW - BOS
MDWBOS
Chicago Midway
Thu 12/25
6:15 pm-9:35 pm
Nonstop2h 20m
Boston Logan Intl
Fri 1/2
5:15 am-7:00 am
Nonstop2h 45m
ChicagoBoston
ORD - BOS
ORDBOS
Chicago O'Hare Intl
Fri 12/12
7:30 am-10:49 am
Nonstop2h 19m
Boston Logan Intl
Sun 12/14
6:00 am-8:00 am
Nonstop3h 00m
ChicagoBoston
ORD - BOS
ORDBOS
Chicago O'Hare Intl
Thu 1/8
6:15 am-2:05 pm
1 stop6h 50m
Boston Logan Intl
Mon 1/12
7:55 pm-10:01 pm
Nonstop3h 06m
ChicagoBoston
ORD - BOS
ORDBOS
Chicago O'Hare Intl
Tue 2/3
2:25 pm-5:54 pm
Nonstop2h 29m
Boston Logan Intl
Mon 2/9
6:35 pm-11:56 pm
1 stop6h 21m
ChicagoBoston
ORD - BOS
ORDBOS
Chicago O'Hare Intl
Fri 1/30
2:25 pm-5:54 pm
Nonstop2h 29m
Boston Logan Intl
Sat 1/31
5:29 am-9:41 am
1 stop5h 12m
ChicagoBoston
ORD - BOS
ORDBOS
Chicago O'Hare Intl
Tue 2/17
10:11 am-1:35 pm
Nonstop2h 24m
Boston Logan Intl
Tue 2/24
3:50 pm-5:53 pm
Nonstop3h 03m
ChicagoBoston
ORD - BOS
ORDBOS
Chicago O'Hare Intl
Thu 1/22
10:29 am-3:53 pm
1 stop4h 24m
Boston Logan Intl
Sat 1/31
5:15 pm-7:26 pm
Nonstop3h 11m
ChicagoBoston
ORD - BOS
ORDBOS
Chicago O'Hare Intl
Tue 1/20
10:45 am-4:23 pm
1 stop4h 38m
Boston Logan Intl
Wed 1/28
4:10 pm-6:19 pm
Nonstop3h 09m
ChicagoBoston
ORD - BOS
ORDBOS
Chicago O'Hare Intl
Wed 1/21
10:29 am-3:53 pm
1 stop4h 24m
Boston Logan Intl
Tue 1/27
11:30 am-1:39 pm
Nonstop3h 09m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars |
The price you pay for your flight from Chicago to Boston may vary depending on when you book. For the best chance of a lower fare, look to book 89 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Currently, September is the cheapest month in which you can book a flight from Chicago to Boston (average of $91). Flying from Chicago to Boston in February is currently the most expensive (average of $138). 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.
It’s typically best to fly out from Chicago to Boston in the evening. Doing so could potentially save you 43% on the flight price compared to flying at noon, which is usually more expensive.
Travelers seeking maximum savings on their Chicago to Boston flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from CHI to BOS are scheduled on a Tuesday (54 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (23 on average).
About 21% of weekly flights between Chicago and Boston have experienced delays in the past year, with the average delay time being 147 minutes.
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Over the last year, Spirit Airlines have had the lowest number of delays on this route, with just 13% of flights being delayed.
Entertainment
Boarding
Comfort
Overall
Crew
Food
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Boarding
Comfort
Overall
Crew
Food
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Boarding
Comfort
Overall
Crew
Food
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Boarding
Comfort
Overall
Crew
Food
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Boarding
Comfort
Overall
Crew
Food
Reviews
Thomas,Dec 2025
SEA - DEN
Entertainment
Boarding
Comfort
Overall
Crew
Food
Reviews
Thomas,Dec 2025
SEA - DEN
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$79 | Average$176 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$83 | Average$166 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$103 | Average$225 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$104 | Average$115 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$117 | Average$232 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$117 | Average$262 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$135 | Average$249 | FlexibilityNo cancel fee | On-time63% |