Route · BOS → ORD · 2020–2025 BTS data
Boston to Chicago
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), BOS to ORD (Boston to Chicago) ranks #60 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 82.1%
- On-time
- +3.1 pts
- vs US avg
- 84 min
- Delay when late
- 35,774
- Flights
- #60 of 4927
- Corpus placement
Cancelled
1.4%
Best Month
Feb 2024 94%
Worst Month
Oct 2025 64%
Distance
867 mi
Carriers
46
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 556 | 167 | 4 | 0 | DL,YX,B6,AA,MQ,UA |
| Nov 2025 | 642 | 173 | 29 | 0 | UA,MQ,AA,B6,DL,YX |
| Oct 2025 | 695 | 248 | 6 | 1 | AA,B6,UA,YX,DL,MQ |
| Sep 2025 | 660 | 210 | 4 | 1 | MQ,UA,DL,YX,AA,B6 |
| Aug 2025 | 683 | 173 | 15 | 5 | AA,YX,MQ,UA,B6,DL |
| Jul 2025 | 673 | 197 | 22 | 8 | AA,B6,UA,YX,DL,MQ |
| Jun 2025 | 669 | 179 | 5 | 1 | AA,B6,UA,YX,DL,MQ |
| May 2025 | 646 | 157 | 5 | 0 | AA,B6,UA,YX,DL,MQ |
| Apr 2025 | 543 | 120 | 6 | 0 | DL,MQ,UA,YX,AA,B6 |
| Mar 2025 | 570 | 87 | 5 | 2 | AA,B6,UA,YX,DL,MQ |
| Feb 2025 | 466 | 132 | 8 | 0 | AA,B6,UA,YX,MQ |
| Jan 2025 | 487 | 71 | 3 | 1 | AA,B6,UA,YX,MQ |
| Dec 2024 | 505 | 91 | 2 | 1 | AA,B6,DL,MQ,NK,UA,YX |
| Nov 2024 | 579 | 65 | 0 | 0 | UA,B6,MQ,NK,YX,DL,AA |
| Oct 2024 | 630 | 107 | 0 | 2 | UA,MQ,DL,NK,B6,AA |
| Sep 2024 | 623 | 103 | 1 | 0 | YX,UA,AA,B6,DL,MQ,NK |
| Aug 2024 | 703 | 198 | 17 | 0 | AA,B6,DL,MQ,NK,YX,UA |
| Jul 2024 | 670 | 183 | 25 | 4 | AA,B6,DL,MQ,NK,UA,YX |
| Jun 2024 | 654 | 153 | 5 | 3 | AA,B6,DL,MQ,NK,OO,UA,YX |
| May 2024 | 622 | 144 | 5 | 4 | AA,B6,DL,MQ,UA,YX |
| Apr 2024 | 536 | 96 | 3 | 0 | AA,B6,DL,MQ,UA,YX |
| Mar 2024 | 506 | 50 | 0 | 0 | AA,B6,DL,MQ,YX,UA |
| Feb 2024 | 437 | 27 | 1 | 3 | AA,B6,MQ,UA,YX |
| Jan 2024 | 467 | 88 | 35 | 2 | AA,B6,MQ,YX,UA |
BOS–ORD seasonal on-time pattern
Best: March (87.2%) · weakest: July (75.9%)
Strongest calendar month
March
87.2% on-time · ~495 flights/mo
Busiest calendar month
August
~578 flights/mo avg
Weakest calendar month
July
75.9% on-time · ~552 flights/mo
Cancellation Rate
1.4%
206 of 14,222 flights
Diversion Rate
0.3%
38 of 14,222 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
BOS - Boston
Full on-time, delay-cause, and seasonal performance for Boston, MA.
BOS on-time profileORD - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
ORD on-time profileCompare the two airports
See BOS and ORD side by side on delays, cancellations, and reliability.
Compare BOS vs ORDOrigin-hub reliability standing
Mid-pack among BOS departures
From BOS, this corridor sits with 49 other 75–85% on-time routes out of 60 tracked departures, not the hub's reliability leaders (6 at ≥85%) and not the softest ( 5 below 75%). Destination: Chicago · fleet on-time rank #2299 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to BOS–ORD.
Routes with a similar on-time rate
What the Data Says About BOS to ORD
Bureau of Transportation Statistics records show Boston to Chicago (BOS to ORD) running a 82.1% on-time rate over 35,774 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 83.7 minutes. The 867-mile corridor is served by 46 carriers, and over the last 24 months 1.4% of 14,222 flights were cancelled, 0.3% diverted.
The monthly split is wide on this route: Feb 2024 posted the strongest performance at 94% on-time, while Oct 2025 came in at just 64% - a 30-point swing worth factoring into travel timing.
On the multi-year calendar, BOS–ORD peaks in March at 87.2% on-time while August carries the heaviest traffic (~578 flights per month) ; the softest month is July at 75.9%, a 11.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does BOS to ORD rank among US routes by traffic? ▼
How often are flights delayed from BOS to ORD? ▼
What is the cancellation rate for BOS to ORD? ▼
How far is the flight from BOS to ORD? ▼
When is the best time to fly from BOS to ORD? ▼
Airports on this route
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Using BOS–ORD data
BOS–ORD runs 3.1 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare BOS and ORD airport profiles: delay causes and top routes differ even on the same corridor. BOS airport
- If your dates flex, March (87.2% on-time) beats July (75.9%) on this corridor. Seasonal chart
- 4 other routes post a similar 82.1% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.