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663 km · Domestic

Boston Logan (BOS) – Washington Dulles (IAD)

In July 2026, 327 flights operated between Boston Logan and Washington Dulles (both directions), and 74.9% left on time, according to the US BTS.

Official · July 2026 according to the US BTS only airlines required to report on-time data to the US DOT

Flights per month

Only complete months are shown. A month appears once the source has published every day of it.

The most recent periods19 periods
PeriodFlights operated 2025Flights operated 2026Change vs last year
January242207▼ 14.5%
February218191▼ 12.4%
March251233▼ 7.2%
April308240▼ 22.1%
May310246▼ 20.6%
June291235▼ 19.2%
July244327▲ 34.0%
August267––
September281––
October246–in progress
November234––
December244––
Year to date (Jan–Jul)1,8641,679▼ 9.9%

On-time departures by month

Departures within 15 minutes of schedule.

The most recent periods19 periods
PeriodOn-time departures 2025On-time departures 2026Change vs last year
January86.8%89.4%▲ 3.0%
February88.5%91.1%▲ 2.9%
March87.6%87.6%0.0%
April90.6%85.0%▼ 6.2%
May79.0%89.8%▲ 13.7%
June75.6%85.1%▲ 12.6%
July74.2%74.9%▲ 0.9%
August81.3%––
September72.2%––
October78.5%–in progress
November86.8%––
December82.0%––
Year-to-date average (Jan–Jul)83.2%86.1%▲ 3.5%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January616▲ 166.7%
February616▲ 166.7%
March05–
April00–
May02–
June05–
July425▲ 525.0%
August0––
September4––
October2–in progress
November4––
December0––
Year to date (Jan–Jul)1669▲ 331.3%

Airlines on this route

  1. United Airlines 97.6%
  2. Republic Airways 2.4%

Oct 1, 2024 – Jul 31, 2026

By direction

BOS → IAD

Scheduled flights
2,779
Flights operated
2,730
Cancelled
49 · 1.8%
On-time departures
86.6%

IAD → BOS

Scheduled flights
2,777
Flights operated
2,729
Cancelled
48 · 1.7%
On-time departures
80.4%

BOS → IAD and IAD → BOS counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
United Airlines UA 5,424 97.6% 83.8% 81
Republic Airways YX 132 2.4% 69.8% 16

Shares are of scheduled flights in the period shown. Codeshare flights are counted once, under the operating airline.

Flight timing & delays

Historical departures, grouped by the scheduled local time at the departure airport. These are recorded outcomes, not a forecast for your flight.

Times are local to the departure airport of each flight; both directions are combined.

US domestic sectors recorded by BTS

Source: the US BTS · Oct 12, 2024 → Jul 31, 2026

Lowest average delay05:00–06:00-2.5min · 643 recorded · 632 measured
Gap to highest-delay hour29.5min05:00 ↔ 17:00
Recorded flights5,556BOS–IAD

Departure hour

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · 96.8% · 643 recorded · 632 measured · Source: the US BTS 06:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 07:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 08:00 · 92.0% · 505 recorded · 502 measured · Source: the US BTS 09:00 · 93.4% · 790 recorded · 778 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 27 recorded · 26 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 3 recorded · 3 measured · Source: the US BTS 12:00 · 85.6% · 707 recorded · 700 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 97 recorded · 97 measured · Source: the US BTS 14:00 · 84.2% · 656 recorded · 645 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 112 recorded · 104 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 35 recorded · 35 measured · Source: the US BTS 17:00 · 70.7% · 657 recorded · 642 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 27 recorded · 20 measured · Source: the US BTS 19:00 · 71.2% · 647 recorded · 636 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 22:00 · 77.9% · 650 recorded · 639 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · -2.5 min · 643 recorded · 632 measured · Source: the US BTS 06:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 07:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 08:00 · 2.2 min · 505 recorded · 502 measured · Source: the US BTS 09:00 · 0.8 min · 790 recorded · 778 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 27 recorded · 26 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 3 recorded · 3 measured · Source: the US BTS 12:00 · 11.2 min · 707 recorded · 700 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 97 recorded · 97 measured · Source: the US BTS 14:00 · 15.1 min · 656 recorded · 645 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 112 recorded · 104 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 35 recorded · 35 measured · Source: the US BTS 17:00 · 27.0 min · 657 recorded · 642 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 27 recorded · 20 measured · Source: the US BTS 19:00 · 22.6 min · 647 recorded · 636 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 22:00 · 13.5 min · 650 recorded · 639 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

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Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · 643 · 643 recorded · 632 measured · Source: the US BTS 06:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 07:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 08:00 · 505 · 505 recorded · 502 measured · Source: the US BTS 09:00 · 790 · 790 recorded · 778 measured · Source: the US BTS 10:00 · 27 · 27 recorded · 26 measured · Source: the US BTS 11:00 · 3 · 3 recorded · 3 measured · Source: the US BTS 12:00 · 707 · 707 recorded · 700 measured · Source: the US BTS 13:00 · 97 · 97 recorded · 97 measured · Source: the US BTS 14:00 · 656 · 656 recorded · 645 measured · Source: the US BTS 15:00 · 112 · 112 recorded · 104 measured · Source: the US BTS 16:00 · 35 · 35 recorded · 35 measured · Source: the US BTS 17:00 · 657 · 657 recorded · 642 measured · Source: the US BTS 18:00 · 27 · 27 recorded · 20 measured · Source: the US BTS 19:00 · 647 · 647 recorded · 636 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 22:00 · 650 · 650 recorded · 639 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

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View the figures
Departure hourOn-time departuresAverage departure delayWith departure timeRecorded flights
00:00No observations———
01:00No observations———
02:00No observations———
03:00No observations———
04:00No observations———
05:0096.8%-2.5 min632643
06:00No observations———
07:00No observations———
08:0092.0%2.2 min502505
09:0093.4%0.8 min778790
10:00Fewer than 200 measured departures—2627
11:00Fewer than 200 measured departures—33
12:0085.6%11.2 min700707
13:00Fewer than 200 measured departures—9797
14:0084.2%15.1 min645656
15:00Fewer than 200 measured departures—104112
16:00Fewer than 200 measured departures—3535
17:0070.7%27.0 min642657
18:00Fewer than 200 measured departures—2027
19:0071.2%22.6 min636647
20:00No observations———
21:00No observations———
22:0077.9%13.5 min639650
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 83.0% · 803 recorded · 776 measured · Source: the US BTS Tuesday · 84.1% · 782 recorded · 766 measured · Source: the US BTS Wednesday · 85.3% · 786 recorded · 780 measured · Source: the US BTS Thursday · 78.5% · 797 recorded · 785 measured · Source: the US BTS Friday · 85.8% · 804 recorded · 800 measured · Source: the US BTS Saturday · 86.5% · 785 recorded · 776 measured · Source: the US BTS Sunday · 81.6% · 799 recorded · 776 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Monday · 10.3 min · 803 recorded · 776 measured · Source: the US BTS Tuesday · 11.0 min · 782 recorded · 766 measured · Source: the US BTS Wednesday · 10.4 min · 786 recorded · 780 measured · Source: the US BTS Thursday · 17.8 min · 797 recorded · 785 measured · Source: the US BTS Friday · 9.4 min · 804 recorded · 800 measured · Source: the US BTS Saturday · 7.8 min · 785 recorded · 776 measured · Source: the US BTS Sunday · 13.0 min · 799 recorded · 776 measured · Source: the US BTS

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Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 803 · 803 recorded · 776 measured · Source: the US BTS Tuesday · 782 · 782 recorded · 766 measured · Source: the US BTS Wednesday · 786 · 786 recorded · 780 measured · Source: the US BTS Thursday · 797 · 797 recorded · 785 measured · Source: the US BTS Friday · 804 · 804 recorded · 800 measured · Source: the US BTS Saturday · 785 · 785 recorded · 776 measured · Source: the US BTS Sunday · 799 · 799 recorded · 776 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday83.0%10.3 min776803
Tuesday84.1%11.0 min766782
Wednesday85.3%10.4 min780786
Thursday78.5%17.8 min785797
Friday85.8%9.4 min800804
Saturday86.5%7.8 min776785
Sunday81.6%13.0 min776799

Month of year

Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Jan · 88.0% · 471 recorded · 449 measured · Source: the US BTS Feb · 89.7% · 431 recorded · 409 measured · Source: the US BTS Mar · 87.6% · 489 recorded · 484 measured · Source: the US BTS Apr · 88.1% · 548 recorded · 548 measured · Source: the US BTS May · 83.8% · 558 recorded · 556 measured · Source: the US BTS Jun · 79.9% · 531 recorded · 526 measured · Source: the US BTS Jul · 74.6% · 600 recorded · 571 measured · Source: the US BTS Aug · 81.3% · 267 recorded · 267 measured · Source: the US BTS Sep · 72.2% · 285 recorded · 281 measured · Source: the US BTS Oct · 83.5% · 408 recorded · 406 measured · Source: the US BTS Nov · 85.6% · 476 recorded · 472 measured · Source: the US BTS Dec · 84.7% · 492 recorded · 490 measured · Source: the US BTS

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Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Jan · 5.5 min · 471 recorded · 449 measured · Source: the US BTS Feb · 3.8 min · 431 recorded · 409 measured · Source: the US BTS Mar · 7.0 min · 489 recorded · 484 measured · Source: the US BTS Apr · 5.6 min · 548 recorded · 548 measured · Source: the US BTS May · 8.6 min · 558 recorded · 556 measured · Source: the US BTS Jun · 16.6 min · 531 recorded · 526 measured · Source: the US BTS Jul · 29.4 min · 600 recorded · 571 measured · Source: the US BTS Aug · 10.8 min · 267 recorded · 267 measured · Source: the US BTS Sep · 18.8 min · 285 recorded · 281 measured · Source: the US BTS Oct · 10.8 min · 408 recorded · 406 measured · Source: the US BTS Nov · 9.0 min · 476 recorded · 472 measured · Source: the US BTS Dec · 9.3 min · 492 recorded · 490 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 471 · 471 recorded · 449 measured · Source: the US BTS Feb · 431 · 431 recorded · 409 measured · Source: the US BTS Mar · 489 · 489 recorded · 484 measured · Source: the US BTS Apr · 548 · 548 recorded · 548 measured · Source: the US BTS May · 558 · 558 recorded · 556 measured · Source: the US BTS Jun · 531 · 531 recorded · 526 measured · Source: the US BTS Jul · 600 · 600 recorded · 571 measured · Source: the US BTS Aug · 267 · 267 recorded · 267 measured · Source: the US BTS Sep · 285 · 285 recorded · 281 measured · Source: the US BTS Oct · 408 · 408 recorded · 406 measured · Source: the US BTS Nov · 476 · 476 recorded · 472 measured · Source: the US BTS Dec · 492 · 492 recorded · 490 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan88.0%5.5 min449471
Feb89.7%3.8 min409431
Mar87.6%7.0 min484489
Apr88.1%5.6 min548548
May83.8%8.6 min556558
Jun79.9%16.6 min526531
Jul74.6%29.4 min571600
Aug81.3%10.8 min267267
Sep72.2%18.8 min281285
Oct83.5%10.8 min406408
Nov85.6%9.0 min472476
Dec84.7%9.3 min490492

Delay and on-time rates need at least 200 measured departures per bucket. Smaller samples remain visible in the flight-count chart. An empty slot means no observations, not zero flights.

Recorded outcomes

  • On time 82.1% 4,559
  • Delayed >15 min 16.2% 900
  • Cancelled 1.7% 97
  • Missing departure time 0.0% 0

All recorded flights with a known scheduled local time, counted once. Missing actual times are shown separately.

On time means departing no more than 15 minutes after schedule. Cancelled flights and flights missing departure times are excluded from the on-time rate and average delay.

Flight numbers on this route

23
23 of 23
Flight numbersBy direction DeparturesOn time
UA641 IAD → BOS 634 91.9%
UA688 IAD → BOS 634 70.6%
UA1734 BOS → IAD 623 96.7%
UA2136 BOS → IAD 621 71.5%
UA755 IAD → BOS 600 77.6%
UA2098 BOS → IAD 545 93.5%
UA721 BOS → IAD 530 86.3%
UA1709 IAD → BOS 172 82.0%
UA1392 IAD → BOS 149 85.7%
UA2060 IAD → BOS 124 87.0%
UA1856 IAD → BOS 88 70.5%
UA530 BOS → IAD 54 92.6%
UA411 BOS → IAD 53 96.2%
UA1347 IAD → BOS 45 93.3%
UA214 BOS → IAD 37 78.4%
UA216 BOS → IAD 37 83.8%
UA673 IAD → BOS 37 91.4%
UA2704 IAD → BOS 36 77.8%
UA539 BOS → IAD 36 69.4%
UA521 BOS → IAD 35 100.0%
UA2081 BOS → IAD 31 90.3%
UA2321 IAD → BOS 31 77.4%
UA2323 IAD → BOS 31 80.7%

Flight numbers are the codes sold on tickets. On shared flights one aircraft can carry several of them. Only numbers with at least 30 flights have a page.

Monthly figures
PeriodFlights operated Change vs last yearCancelled On-time departures
July 2026 327 +34.0% 25 74.9%
June 2026 235 −19.2% 5 85.1%
May 2026 246 −20.6% 2 89.8%
April 2026 240 −22.1% 0 85.0%
March 2026 233 −7.2% 5 87.6%
February 2026 191 −12.4% 16 91.1%
January 2026 207 −14.5% 16 89.4%
December 2025 244 −0.8% 0 82.0%
November 2025 234 −1.7% 4 86.8%
October 2025 246 +53.8% 2 78.5%
September 2025 281 4 72.2%
August 2025 267 0 81.3%
July 2025 244 4 74.2%
June 2025 291 0 75.6%
May 2025 310 0 79.0%
April 2025 308 0 90.6%
March 2025 251 0 87.6%
February 2025 218 6 88.5%
January 2025 242 6 86.8%
December 2024 246 2 87.4%
November 2024 238 0 84.5%
October 2024 160 0 91.3%

How to read this chart

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