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457 km · Domestic

Buffalo Niagara (BUF) – Washington Dulles (IAD)

In July 2026, 79 flights operated between Buffalo Niagara and Washington Dulles (both directions), and 83.5% 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 periods18 periods
PeriodFlights operated 2025Flights operated 2026Change vs last year
January880.0%
February332▲ 966.7%
March–7–
April220.0%
May8343▼ 48.2%
June122▲ 2,100.0%
July5779▲ 38.6%
August28––
September28––
October2–in progress
November6––
December27––

On-time departures by month

Departures within 15 minutes of schedule.

The most recent periods18 periods
PeriodOn-time departures 2025On-time departures 2026Change vs last year
January87.5%100.0%▲ 14.3%
February100.0%78.1%▼ 21.9%
March–85.7%–
April100.0%100.0%0.0%
May77.1%95.3%▲ 23.6%
June0.0%100.0%–
July73.7%83.5%▲ 13.3%
August96.4%––
September75.0%––
October100.0%–in progress
November100.0%––
December74.1%––

Cancelled flights by month

The most recent periods18 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January00–
February110.0%
March–0–
April00–
May00–
June00–
July46▲ 50.0%
August0––
September0––
October0–in progress
November2––
December1––

Airlines on this route

  1. Republic Airways 91.0%
  2. United Airlines 9.0%

Oct 1, 2024 – Jul 31, 2026

By direction

BUF → IAD

Scheduled flights
288
Flights operated
284
Cancelled
4 · 1.4%
On-time departures
86.6%

IAD → BUF

Scheduled flights
288
Flights operated
277
Cancelled
11 · 3.8%
On-time departures
84.1%

BUF → IAD and IAD → BUF counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Republic Airways YX 524 91.0% 84.7% 14
United Airlines UA 52 9.0% 92.2% 1

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

Recorded flights576BUF–IAD

Departure hour

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 · 137 · 137 recorded · 135 measured · Source: the US BTS 07:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 08:00 · 52 · 52 recorded · 50 measured · Source: the US BTS 09:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 10:00 · 73 · 73 recorded · 71 measured · Source: the US BTS 11:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 12:00 · 5 · 5 recorded · 5 measured · Source: the US BTS 13:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 14:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 15:00 · 5 · 5 recorded · 5 measured · Source: the US BTS 16:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 17:00 · 76 · 76 recorded · 76 measured · Source: the US BTS 18:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 19:00 · 47 · 47 recorded · 47 measured · Source: the US BTS 20:00 · 26 · 26 recorded · 26 measured · Source: the US BTS 21:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 22:00 · 155 · 155 recorded · 146 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.

No bucket in this view has 200 measured departures yet. Flight counts are shown; on-time and delay charts become available when the sample is large enough.

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—135137
07:00No observations———
08:00Fewer than 200 measured departures—5052
09:00No observations———
10:00Fewer than 200 measured departures—7173
11:00No observations———
12:00Fewer than 200 measured departures—55
13:00No observations———
14:00No observations———
15:00Fewer than 200 measured departures—55
16:00No observations———
17:00Fewer than 200 measured departures—7676
18:00No observations———
19:00Fewer than 200 measured departures—4747
20:00Fewer than 200 measured departures—2626
21:00No observations———
22:00Fewer than 200 measured departures—146155
23:00No observations———

Day of week

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 81 · 81 recorded · 76 measured · Source: the US BTS Tuesday · 64 · 64 recorded · 61 measured · Source: the US BTS Wednesday · 86 · 86 recorded · 83 measured · Source: the US BTS Thursday · 95 · 95 recorded · 94 measured · Source: the US BTS Friday · 93 · 93 recorded · 93 measured · Source: the US BTS Saturday · 72 · 72 recorded · 71 measured · Source: the US BTS Sunday · 85 · 85 recorded · 83 measured · Source: the US BTS

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

No bucket in this view has 200 measured departures yet. Flight counts are shown; on-time and delay charts become available when the sample is large enough.

View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
MondayFewer than 200 measured departures—7681
TuesdayFewer than 200 measured departures—6164
WednesdayFewer than 200 measured departures—8386
ThursdayFewer than 200 measured departures—9495
FridayFewer than 200 measured departures—9393
SaturdayFewer than 200 measured departures—7172
SundayFewer than 200 measured departures—8385

Month of year

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

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 16 · 16 recorded · 16 measured · Source: the US BTS Feb · 37 · 37 recorded · 35 measured · Source: the US BTS Mar · 7 · 7 recorded · 7 measured · Source: the US BTS Apr · 4 · 4 recorded · 4 measured · Source: the US BTS May · 126 · 126 recorded · 126 measured · Source: the US BTS Jun · 23 · 23 recorded · 23 measured · Source: the US BTS Jul · 146 · 146 recorded · 136 measured · Source: the US BTS Aug · 28 · 28 recorded · 28 measured · Source: the US BTS Sep · 28 · 28 recorded · 28 measured · Source: the US BTS Oct · 42 · 42 recorded · 42 measured · Source: the US BTS Nov · 86 · 86 recorded · 84 measured · Source: the US BTS Dec · 33 · 33 recorded · 32 measured · Source: the US BTS

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

No bucket in this view has 200 measured departures yet. Flight counts are shown; on-time and delay charts become available when the sample is large enough.

View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
JanFewer than 200 measured departures—1616
FebFewer than 200 measured departures—3537
MarFewer than 200 measured departures—77
AprFewer than 200 measured departures—44
MayFewer than 200 measured departures—126126
JunFewer than 200 measured departures—2323
JulFewer than 200 measured departures—136146
AugFewer than 200 measured departures—2828
SepFewer than 200 measured departures—2828
OctFewer than 200 measured departures—4242
NovFewer than 200 measured departures—8486
DecFewer than 200 measured departures—3233

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 83.2% 479
  • Delayed >15 min 14.2% 82
  • Cancelled 2.6% 15
  • 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

4
Flight numbersBy direction DeparturesOn time
YX3430 BUF → IAD 42 85.7%
YX3516 IAD → BUF 42 84.2%
YX3514 IAD → BUF 33 96.8%
YX3575 BUF → IAD 31 83.3%

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 79 +38.6% 6 83.5%
June 2026 22 +2,100.0% 0 100.0%
May 2026 43 −48.2% 0 95.3%
April 2026 2 +0.0% 0 100.0%
March 2026 7 0 85.7%
February 2026 32 +966.7% 1 78.1%
January 2026 8 +0.0% 0 100.0%
December 2025 27 +440.0% 1 74.1%
November 2025 6 −92.3% 2 100.0%
October 2025 2 −95.0% 0 100.0%
September 2025 28 0 75.0%
August 2025 28 0 96.4%
July 2025 57 4 73.7%
June 2025 1 0 0.0%
May 2025 83 0 77.1%
April 2025 2 0 100.0%
February 2025 3 1 100.0%
January 2025 8 0 87.5%
December 2024 5 0 100.0%
November 2024 78 0 92.3%
October 2024 40 0 95.0%

How to read this chart

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