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2,534 km · International

Washington Dulles (IAD) – Luis Munoz Marin (SJU)

In July 2026, 124 flights operated between Washington Dulles and Luis Munoz Marin (both directions), and 84.7% 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
January122139▲ 13.9%
February112126▲ 12.5%
March121134▲ 10.7%
April76124▲ 63.2%
May76124▲ 63.2%
June101120▲ 18.8%
July105124▲ 18.1%
August100––
September26––
October87–in progress
November146––
December154––
Year to date (Jan–Jul)713891▲ 25.0%

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
January82.8%88.5%▲ 6.9%
February93.8%80.2%▼ 14.5%
March91.7%85.1%▼ 7.2%
April96.1%94.4%▼ 1.8%
May85.5%89.5%▲ 4.7%
June82.2%88.3%▲ 7.4%
July79.0%84.7%▲ 7.2%
August85.0%––
September100.0%––
October82.8%–in progress
November84.2%––
December74.7%––
Year-to-date average (Jan–Jul)87.3%87.2%▼ 0.1%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January29▲ 350.0%
February00–
March10▼ 100.0%
April00–
May00–
June00–
July10▼ 100.0%
August0––
September0––
October0–in progress
November0––
December0––
Year to date (Jan–Jul)49▲ 125.0%

Airlines on this route

  1. United Airlines 91.0%
  2. Frontier Airlines 9.0%

Oct 1, 2024 – Jul 31, 2026

By direction

IAD → SJU

Scheduled flights
1,159
Flights operated
1,153
Cancelled
6 · 0.5%
On-time departures
84.0%

SJU → IAD

Scheduled flights
1,158
Flights operated
1,151
Cancelled
7 · 0.6%
On-time departures
87.7%

IAD → SJU and SJU → IAD counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
United Airlines UA 2,109 91.0% 87.9% 10
Frontier Airlines F9 208 9.0% 63.9% 3

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 delay07:00–08:00-3.5min · 281 recorded · 281 measured
Gap to highest-delay hour14.5min07:00 ↔ 16:00
Recorded flights2,317IAD–SJU

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 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 14 recorded · 14 measured · Source: the US BTS 07:00 · 96.1% · 281 recorded · 281 measured · Source: the US BTS 08:00 · 93.3% · 841 recorded · 836 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 12 recorded · 12 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 5 recorded · 5 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 9 recorded · 9 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 39 recorded · 38 measured · Source: the US BTS 13:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 14 recorded · 14 measured · Source: the US BTS 16:00 · 79.0% · 383 recorded · 381 measured · Source: the US BTS 17:00 · 80.7% · 667 recorded · 663 measured · Source: the US BTS 18:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 14 recorded · 14 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 31 recorded · 30 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 6 recorded · 6 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 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 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 14 recorded · 14 measured · Source: the US BTS 07:00 · -3.5 min · 281 recorded · 281 measured · Source: the US BTS 08:00 · -0.1 min · 841 recorded · 836 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 12 recorded · 12 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 5 recorded · 5 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 9 recorded · 9 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 39 recorded · 38 measured · Source: the US BTS 13:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 14 recorded · 14 measured · Source: the US BTS 16:00 · 11.0 min · 383 recorded · 381 measured · Source: the US BTS 17:00 · 10.6 min · 667 recorded · 663 measured · Source: the US BTS 18:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 14 recorded · 14 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 31 recorded · 30 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 6 recorded · 6 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 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.

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 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · 14 · 14 recorded · 14 measured · Source: the US BTS 07:00 · 281 · 281 recorded · 281 measured · Source: the US BTS 08:00 · 841 · 841 recorded · 836 measured · Source: the US BTS 09:00 · 12 · 12 recorded · 12 measured · Source: the US BTS 10:00 · 5 · 5 recorded · 5 measured · Source: the US BTS 11:00 · 9 · 9 recorded · 9 measured · Source: the US BTS 12:00 · 39 · 39 recorded · 38 measured · Source: the US BTS 13:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 14:00 · 1 · 1 recorded · 1 measured · Source: the US BTS 15:00 · 14 · 14 recorded · 14 measured · Source: the US BTS 16:00 · 383 · 383 recorded · 381 measured · Source: the US BTS 17:00 · 667 · 667 recorded · 663 measured · Source: the US BTS 18:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 19:00 · 14 · 14 recorded · 14 measured · Source: the US BTS 20:00 · 31 · 31 recorded · 30 measured · Source: the US BTS 21:00 · 6 · 6 recorded · 6 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 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———
05:00No observations———
06:00Fewer than 200 measured departures—1414
07:0096.1%-3.5 min281281
08:0093.3%-0.1 min836841
09:00Fewer than 200 measured departures—1212
10:00Fewer than 200 measured departures—55
11:00Fewer than 200 measured departures—99
12:00Fewer than 200 measured departures—3839
13:00No observations———
14:00Fewer than 200 measured departures—11
15:00Fewer than 200 measured departures—1414
16:0079.0%11.0 min381383
17:0080.7%10.6 min663667
18:00No observations———
19:00Fewer than 200 measured departures—1414
20:00Fewer than 200 measured departures—3031
21:00Fewer than 200 measured departures—66
22:00No observations———
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 86.9% · 323 recorded · 321 measured · Source: the US BTS Tuesday · 88.1% · 314 recorded · 312 measured · Source: the US BTS Wednesday · 90.6% · 286 recorded · 286 measured · Source: the US BTS Thursday · 86.2% · 340 recorded · 340 measured · Source: the US BTS Friday · 90.1% · 312 recorded · 312 measured · Source: the US BTS Saturday · 78.7% · 353 recorded · 348 measured · Source: the US BTS Sunday · 82.1% · 389 recorded · 385 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 · 11.0 min · 323 recorded · 321 measured · Source: the US BTS Tuesday · 11.2 min · 314 recorded · 312 measured · Source: the US BTS Wednesday · 1.2 min · 286 recorded · 286 measured · Source: the US BTS Thursday · 7.5 min · 340 recorded · 340 measured · Source: the US BTS Friday · 5.2 min · 312 recorded · 312 measured · Source: the US BTS Saturday · 10.6 min · 353 recorded · 348 measured · Source: the US BTS Sunday · 10.7 min · 389 recorded · 385 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
Monday · 323 · 323 recorded · 321 measured · Source: the US BTS Tuesday · 314 · 314 recorded · 312 measured · Source: the US BTS Wednesday · 286 · 286 recorded · 286 measured · Source: the US BTS Thursday · 340 · 340 recorded · 340 measured · Source: the US BTS Friday · 312 · 312 recorded · 312 measured · Source: the US BTS Saturday · 353 · 353 recorded · 348 measured · Source: the US BTS Sunday · 389 · 389 recorded · 385 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday86.9%11.0 min321323
Tuesday88.1%11.2 min312314
Wednesday90.6%1.2 min286286
Thursday86.2%7.5 min340340
Friday90.1%5.2 min312312
Saturday78.7%10.6 min348353
Sunday82.1%10.7 min385389

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 · 85.8% · 272 recorded · 261 measured · Source: the US BTS Feb · 86.6% · 238 recorded · 238 measured · Source: the US BTS Mar · 88.2% · 256 recorded · 255 measured · Source: the US BTS Apr · 95.0% · 200 recorded · 200 measured · Source: the US BTS May · 88.0% · 200 recorded · 200 measured · Source: the US BTS Jun · 85.5% · 221 recorded · 221 measured · Source: the US BTS Jul · 82.1% · 230 recorded · 229 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 100 recorded · 100 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 26 recorded · 26 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 127 recorded · 127 measured · Source: the US BTS Nov · 85.0% · 206 recorded · 206 measured · Source: the US BTS Dec · 77.6% · 241 recorded · 241 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
Jan · 8.7 min · 272 recorded · 261 measured · Source: the US BTS Feb · 14.4 min · 238 recorded · 238 measured · Source: the US BTS Mar · 2.8 min · 256 recorded · 255 measured · Source: the US BTS Apr · -0.9 min · 200 recorded · 200 measured · Source: the US BTS May · 2.0 min · 200 recorded · 200 measured · Source: the US BTS Jun · 6.3 min · 221 recorded · 221 measured · Source: the US BTS Jul · 21.4 min · 230 recorded · 229 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 100 recorded · 100 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 26 recorded · 26 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 127 recorded · 127 measured · Source: the US BTS Nov · 4.7 min · 206 recorded · 206 measured · Source: the US BTS Dec · 15.1 min · 241 recorded · 241 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 · 272 · 272 recorded · 261 measured · Source: the US BTS Feb · 238 · 238 recorded · 238 measured · Source: the US BTS Mar · 256 · 256 recorded · 255 measured · Source: the US BTS Apr · 200 · 200 recorded · 200 measured · Source: the US BTS May · 200 · 200 recorded · 200 measured · Source: the US BTS Jun · 221 · 221 recorded · 221 measured · Source: the US BTS Jul · 230 · 230 recorded · 229 measured · Source: the US BTS Aug · 100 · 100 recorded · 100 measured · Source: the US BTS Sep · 26 · 26 recorded · 26 measured · Source: the US BTS Oct · 127 · 127 recorded · 127 measured · Source: the US BTS Nov · 206 · 206 recorded · 206 measured · Source: the US BTS Dec · 241 · 241 recorded · 241 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan85.8%8.7 min261272
Feb86.6%14.4 min238238
Mar88.2%2.8 min255256
Apr95.0%-0.9 min200200
May88.0%2.0 min200200
Jun85.5%6.3 min221221
Jul82.1%21.4 min229230
AugFewer than 200 measured departures—100100
SepFewer than 200 measured departures—2626
OctFewer than 200 measured departures—127127
Nov85.0%4.7 min206206
Dec77.6%15.1 min241241

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 85.3% 1,977
  • Delayed >15 min 14.1% 327
  • Cancelled 0.6% 13
  • 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

6
Flight numbersBy direction DeparturesOn time
UA2021 IAD → SJU 640 92.2%
UA2024 SJU → IAD 597 82.6%
UA2022 SJU → IAD 457 97.1%
UA2025 IAD → SJU 415 79.0%
F992905 SJU → IAD 104 74.8%
F992906 IAD → SJU 102 52.0%

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 124 +18.1% 0 84.7%
June 2026 120 +18.8% 0 88.3%
May 2026 124 +63.2% 0 89.5%
April 2026 124 +63.2% 0 94.4%
March 2026 134 +10.7% 0 85.1%
February 2026 126 +12.5% 0 80.2%
January 2026 139 +13.9% 9 88.5%
December 2025 154 +77.0% 0 74.7%
November 2025 146 +143.3% 0 84.2%
October 2025 87 +117.5% 0 82.8%
September 2025 26 0 100.0%
August 2025 100 0 85.0%
July 2025 105 1 79.0%
June 2025 101 0 82.2%
May 2025 76 0 85.5%
April 2025 76 0 96.1%
March 2025 121 1 91.7%
February 2025 112 0 93.8%
January 2025 122 2 82.8%
December 2024 87 0 82.8%
November 2024 60 0 86.7%
October 2024 40 0 85.0%

How to read this chart

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