Route · MDW → BOS · 2020–2025 BTS data
Chicago to Boston
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), MDW to BOS (Chicago to Boston) ranks #1730 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 75.8%
- On-time
- -3.2 pts
- vs US avg
- 61 min
- Delay when late
- 7,295
- Flights
- #1730 of 4927
- Corpus placement
Cancelled
0.8%
Best Month
Jan 2025 92%
Worst Month
Sep 2025 55%
Distance
861 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 90 | 24 | 0 | 0 | WN |
| Nov 2025 | 88 | 22 | 4 | 0 | WN |
| Oct 2025 | 139 | 52 | 1 | 0 | WN |
| Sep 2025 | 128 | 57 | 0 | 0 | WN |
| Aug 2025 | 134 | 35 | 0 | 0 | WN |
| Jul 2025 | 172 | 54 | 4 | 0 | WN |
| Jun 2025 | 157 | 57 | 0 | 0 | WN |
| May 2025 | 101 | 39 | 0 | 0 | WN |
| Apr 2025 | 94 | 12 | 0 | 0 | WN |
| Mar 2025 | 83 | 17 | 1 | 0 | WN |
| Feb 2025 | 66 | 12 | 0 | 0 | WN |
| Jan 2025 | 71 | 6 | 0 | 1 | WN |
| Dec 2024 | 91 | 27 | 1 | 0 | WN |
| Nov 2024 | 89 | 15 | 0 | 0 | WN |
| Oct 2024 | 139 | 16 | 0 | 0 | WN |
| Sep 2024 | 136 | 26 | 0 | 0 | WN |
| Aug 2024 | 144 | 47 | 1 | 1 | WN |
| Jul 2024 | 170 | 52 | 1 | 0 | WN |
| Jun 2024 | 160 | 62 | 0 | 0 | WN |
| May 2024 | 108 | 29 | 0 | 0 | WN |
| Apr 2024 | 102 | 14 | 0 | 0 | WN |
| Mar 2024 | 97 | 22 | 0 | 0 | WN |
| Feb 2024 | 75 | 9 | 1 | 0 | WN |
| Jan 2024 | 83 | 21 | 9 | 0 | WN |
MDW–BOS seasonal on-time pattern
Best: February (84.5%) · weakest: September (68.4%)
Strongest calendar month
February
84.5% on-time · ~69 flights/mo
Busiest calendar month
July
~141 flights/mo avg
Weakest calendar month
September
68.4% on-time · ~110 flights/mo
Cancellation Rate
0.8%
23 of 2,717 flights
Diversion Rate
0.1%
2 of 2,717 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
MDW - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
MDW on-time profileBOS - Boston
Full on-time, delay-cause, and seasonal performance for Boston, MA.
BOS on-time profileCompare the two airports
See MDW and BOS side by side on delays, cancellations, and reliability.
Compare MDW vs BOSOrigin-hub reliability standing
Mid-pack among MDW departures
From MDW, this corridor sits with 51 other 75–85% on-time routes out of 69 tracked departures, not the hub's reliability leaders (0 at ≥85%) and not the softest ( 18 below 75%). Destination: Boston · fleet on-time rank #4345 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to MDW–BOS.
Routes with a similar on-time rate
What the Data Says About MDW to BOS
The Chicago to Boston corridor (MDW to BOS) posts a 75.8% on-time rate on the lower edge of the average band, based on 7,295 tracked flights. Late flights run 60.5 minutes behind on average. 1 carrier cover the 861-mile route; over the last 24 months, 23 of 2,717 flights were cancelled (0.8%) and 0.1% diverted.
The monthly split is wide on this route: Jan 2025 posted the strongest performance at 92% on-time, while Sep 2025 came in at just 55% - a 36-point swing worth factoring into travel timing.
On the multi-year calendar, MDW–BOS peaks in February at 84.5% on-time while July carries the heaviest traffic (~141 flights per month) ; the softest month is September at 68.4%, a 16.1-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does MDW to BOS rank among US routes by traffic? ▼
How often are flights delayed from MDW to BOS? ▼
What is the cancellation rate for MDW to BOS? ▼
How far is the flight from MDW to BOS? ▼
When is the best time to fly from MDW to BOS? ▼
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 MDW–BOS data
MDW–BOS is mid-pack at 75.8% on-time; month and carrier mix move more than the corridor headline.
- Compare MDW and BOS airport profiles: delay causes and top routes differ even on the same corridor. MDW airport
- If your dates flex, February (84.5% on-time) beats September (68.4%) on this corridor. Seasonal chart
- 4 other routes post a similar 75.8% 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.