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Route · BWI → BOS · 2020–2025 BTS data

Baltimore to Boston

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), BWI to BOS (Baltimore to Boston) ranks #353 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

78.1%
On-time
-0.9 pts
vs US avg
69 min
Delay when late
19,573
Flights
#353 of 4927
Corpus placement

Cancelled

1.6%

Best Month

Jan 2025 88%

Worst Month

Sep 2025 61%

Distance

369 mi

Carriers

23

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 274 73 4 1 YX,WN
Nov 2025 293 41 17 0 WN,YX
Oct 2025 336 107 3 0 WN,YX
Sep 2025 288 113 4 0 WN,YX
Aug 2025 318 66 4 0 WN,YX,NK
Jul 2025 365 103 18 0 NK,WN,YX
Jun 2025 359 113 8 0 WN,YX,NK
May 2025 370 131 1 0 NK,WN,YX
Apr 2025 357 79 0 0 NK,WN,YX
Mar 2025 326 62 1 0 NK,WN,YX
Feb 2025 285 50 3 0 WN,YX,NK
Jan 2025 307 37 13 0 WN,YX,NK
Dec 2024 351 57 6 0 NK,WN,YX
Nov 2024 373 47 0 0 YX,NK,WN
Oct 2024 389 63 0 0 WN,YX,NK
Sep 2024 359 68 0 0 WN,YX,NK
Aug 2024 385 105 19 1 NK,WN,YX
Jul 2024 338 128 3 0 NK,WN,YX
Jun 2024 338 95 3 2 NK,WN,YX
May 2024 356 131 2 0 NK,WN,YX
Apr 2024 339 84 2 0 B6,WN,YX
Mar 2024 292 58 0 0 B6,YX,WN
Feb 2024 262 38 4 0 B6,WN,YX
Jan 2024 288 73 16 0 B6,WN,YX

BWI–BOS seasonal on-time pattern

Best: February (85.7%) · weakest: July (70.3%)

65%70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 79.3%

Strongest calendar month

February

85.7% on-time · ~237 flights/mo

Busiest calendar month

August

~300 flights/mo avg

Weakest calendar month

July

70.3% on-time · ~295 flights/mo

Cancellation Rate

1.6%

131 of 7,948 flights

Diversion Rate

0.1%

4 of 7,948 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

BWI - Baltimore

Full on-time, delay-cause, and seasonal performance for Baltimore, MD.

BWI on-time profile

BOS - Boston

Full on-time, delay-cause, and seasonal performance for Boston, MA.

BOS on-time profile

Compare the two airports

See BWI and BOS side by side on delays, cancellations, and reliability.

Compare BWI vs BOS

Origin-hub reliability standing

Mid-pack among BWI departures

From BWI, this corridor sits with 53 other 75–85% on-time routes out of 64 tracked departures, not the hub's reliability leaders (0 at ≥85%) and not the softest ( 11 below 75%). Destination: Boston · fleet on-time rank #3802 of 4927.

What the Data Says About BWI to BOS

The Baltimore to Boston corridor (BWI to BOS) posts a 78.1% on-time rate on the lower edge of the average band, based on 19,573 tracked flights. Late flights run 69.0 minutes behind on average. 23 carriers cover the 369-mile route; over the last 24 months, 131 of 7,948 flights were cancelled (1.6%) and 0.1% diverted.

The monthly split is wide on this route: Jan 2025 posted the strongest performance at 88% on-time, while Sep 2025 came in at just 61% - a 27-point swing worth factoring into travel timing.

On the multi-year calendar, BWI–BOS peaks in February at 85.7% on-time while August carries the heaviest traffic (~300 flights per month) ; the softest month is July at 70.3%, a 15.4-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does BWI to BOS rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, BWI to BOS ranks #353 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from BWI to BOS? ▼
Flights from Baltimore to Boston have a 78.1% on-time rate based on 19,573 flights. The average delay is 69.0 minutes. The best recent month was Jan 2025 with 88% on-time.
What is the cancellation rate for BWI to BOS? ▼
Over the last 24 months, 1.6% of flights on this route were cancelled (131 of 7,948 flights) and 0.1% were diverted.
How far is the flight from BWI to BOS? ▼
The flight distance from Baltimore (BWI) to Boston (BOS) is approximately 369 miles. This route is served by 23 carriers.
When is the best time to fly from BWI to BOS? ▼
The best recent month for on-time performance was Jan 2025 (88% on-time). The worst was Sep 2025 (61% on-time). Consider booking during months with historically better performance.

Airports on this route

BWI Airport

Baltimore
BOS Airport

Boston
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 BWI–BOS data

BWI–BOS is mid-pack at 78.1% on-time; month and carrier mix move more than the corridor headline.

  • Compare BWI and BOS airport profiles: delay causes and top routes differ even on the same corridor. BWI airport
  • If your dates flex, February (85.7% on-time) beats July (70.3%) on this corridor. Seasonal chart
  • 4 other routes post a similar 78.1% 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.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

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.