Buffalo Niagara (BUF) – Chicago O'Hare (ORD)
In July 2026, 414 flights operated between Buffalo Niagara and Chicago O'Hare (both directions), and 74.6% left on time, according to the US BTS.
- Flights operated · latest month414▼ 2.6%vs July 2025
- On-time departures79.3%Average delay 15.6 min
- Cancelled2.2%172 of 7,665 scheduled flights
- Airlines6
- Rank in country#471
Official · July 2026 according to the US BTS only airlines required to report on-time data to the US DOT
Flights per month
Partial coverage: only airlines that report on-time data to the US DOT · 22 of 22 periods have data
Only complete months are shown. A month appears once the source has published every day of it.
The most recent periods19 periods
| Period | Flights operated 2025 | Flights operated 2026 | Change vs last year |
|---|---|---|---|
| January | 243 | 312 | ▲ 28.4% |
| February | 240 | 252 | ▲ 5.0% |
| March | 296 | 343 | ▲ 15.9% |
| April | 400 | 355 | ▼ 11.3% |
| May | 461 | 429 | ▼ 6.9% |
| June | 363 | 405 | ▲ 11.6% |
| July | 425 | 414 | ▼ 2.6% |
| August | 360 | – | – |
| September | 356 | – | – |
| October | 362 | – | in progress |
| November | 356 | – | – |
| December | 315 | – | – |
| Year to date (Jan–Jul) | 2,428 | 2,510 | ▲ 3.4% |
On-time departures by month
Partial coverage: only airlines that report on-time data to the US DOT · 22 of 22 periods have data
Departures within 15 minutes of schedule.
The most recent periods19 periods
| Period | On-time departures 2025 | On-time departures 2026 | Change vs last year |
|---|---|---|---|
| January | 81.9% | 73.1% | ▼ 10.7% |
| February | 82.5% | 77.4% | ▼ 6.2% |
| March | 84.1% | 66.5% | ▼ 20.9% |
| April | 89.3% | 76.1% | ▼ 14.8% |
| May | 86.1% | 77.6% | ▼ 9.9% |
| June | 76.0% | 78.8% | ▲ 3.7% |
| July | 68.9% | 74.6% | ▲ 8.3% |
| August | 77.2% | – | – |
| September | 83.7% | – | – |
| October | 83.4% | – | in progress |
| November | 81.7% | – | – |
| December | 71.4% | – | – |
| Year-to-date average (Jan–Jul) | 81.3% | 74.9% | ▼ 7.9% |
Cancelled flights by month
Partial coverage: only airlines that report on-time data to the US DOT · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled flights 2025 | Cancelled flights 2026 | Change vs last year |
|---|---|---|---|
| January | 3 | 16 | ▲ 433.3% |
| February | 4 | 2 | ▼ 50.0% |
| March | 0 | 21 | – |
| April | 6 | 15 | ▲ 150.0% |
| May | 2 | 4 | ▲ 100.0% |
| June | 15 | 13 | ▼ 13.3% |
| July | 3 | 20 | ▲ 566.7% |
| August | 7 | – | – |
| September | 2 | – | – |
| October | 0 | – | in progress |
| November | 22 | – | – |
| December | 16 | – | – |
| Year to date (Jan–Jul) | 33 | 91 | ▲ 175.8% |
By direction
BUF → ORD
- Scheduled flights
- 3,833
- Flights operated
- 3,743
- Cancelled
- 90 · 2.3%
- On-time departures
- 82.2%
ORD → BUF
- Scheduled flights
- 3,832
- Flights operated
- 3,750
- Cancelled
- 82 · 2.1%
- On-time departures
- 76.3%
BUF → ORD and ORD → BUF counted separately.
Airlines on this route
Oct 1, 2024 – Jul 31, 2026| Airline | Scheduled flights | Share | On-time departures | Cancelled |
|---|---|---|---|---|
| United Airlines UA | 2,294 | 29.9% | 81.5% | 24 |
| Envoy Air MQ | 2,052 | 26.8% | 82.8% | 29 |
| Republic Airways YX | 1,223 | 16.0% | 83.0% | 36 |
| American Airlines AA | 1,212 | 15.8% | 70.9% | 35 |
| SkyWest Airlines OO | 883 | 11.5% | 71.0% | 48 |
| PSA Airlines OH | 1 | 0.0% | 100.0% | 0 |
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 delay07:00–08:006.6min · 1,209 recorded · 1,194 measured
Gap to highest-delay hour34.0min07:00 ↔ 19:00
Recorded flights7,665BUF–ORD
Departure hour
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| Departure hour | On-time departures | Average departure delay | With departure time | Recorded flights |
|---|---|---|---|---|
| 00:00 | Fewer than 200 measured departures | — | 1 | 1 |
| 01:00 | No observations | — | — | — |
| 02:00 | No observations | — | — | — |
| 03:00 | No observations | — | — | — |
| 04:00 | No observations | — | — | — |
| 05:00 | Fewer than 200 measured departures | — | 104 | 109 |
| 06:00 | 90.0% | 7.2 min | 389 | 400 |
| 07:00 | 90.8% | 6.6 min | 1,194 | 1,209 |
| 08:00 | 85.6% | 10.8 min | 473 | 481 |
| 09:00 | Fewer than 200 measured departures | — | 195 | 196 |
| 10:00 | 85.5% | 9.7 min | 532 | 541 |
| 11:00 | 83.5% | 10.1 min | 455 | 462 |
| 12:00 | Fewer than 200 measured departures | — | 134 | 137 |
| 13:00 | 72.2% | 20.8 min | 490 | 507 |
| 14:00 | 82.3% | 10.0 min | 783 | 801 |
| 15:00 | Fewer than 200 measured departures | — | 193 | 196 |
| 16:00 | 67.1% | 22.3 min | 216 | 229 |
| 17:00 | 71.3% | 27.3 min | 851 | 871 |
| 18:00 | 73.9% | 21.2 min | 953 | 971 |
| 19:00 | 51.4% | 40.5 min | 216 | 218 |
| 20:00 | Fewer than 200 measured departures | — | 192 | 203 |
| 21:00 | Fewer than 200 measured departures | — | 93 | 102 |
| 22:00 | Fewer than 200 measured departures | — | 27 | 29 |
| 23:00 | Fewer than 200 measured departures | — | 2 | 2 |
Day of week
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| Day of week | On-time departures | Average departure delay | With departure time | Recorded flights |
|---|---|---|---|---|
| Monday | 79.2% | 16.7 min | 1,108 | 1,135 |
| Tuesday | 82.6% | 11.9 min | 1,056 | 1,077 |
| Wednesday | 80.8% | 14.0 min | 1,077 | 1,096 |
| Thursday | 79.4% | 15.7 min | 1,106 | 1,128 |
| Friday | 77.3% | 14.7 min | 1,093 | 1,118 |
| Saturday | 78.9% | 17.8 min | 982 | 1,003 |
| Sunday | 76.7% | 18.6 min | 1,071 | 1,108 |
Month of year
Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.
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| Month of year | On-time departures | Average departure delay | With departure time | Recorded flights |
|---|---|---|---|---|
| Jan | 76.9% | 17.4 min | 555 | 574 |
| Feb | 79.9% | 16.8 min | 492 | 498 |
| Mar | 74.7% | 17.6 min | 639 | 660 |
| Apr | 83.1% | 8.5 min | 755 | 776 |
| May | 82.0% | 11.5 min | 890 | 896 |
| Jun | 77.5% | 16.0 min | 768 | 796 |
| Jul | 71.8% | 24.5 min | 839 | 862 |
| Aug | 77.2% | 22.7 min | 360 | 367 |
| Sep | 83.7% | 18.1 min | 356 | 358 |
| Oct | 87.0% | 4.7 min | 567 | 567 |
| Nov | 83.3% | 13.9 min | 641 | 664 |
| Dec | 76.9% | 19.4 min | 631 | 647 |
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 77.5% 5,939
- Delayed >15 min 20.3% 1,554
- Cancelled 2.2% 172
- 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
8787 of 87
| Flight numbers | By direction | Departures | On time |
|---|---|---|---|
| UA1335 | ORD → BUF | 438 | 76.3% |
| UA329 | BUF → ORD | 348 | 92.4% |
| UA630 | BUF → ORD | 262 | 71.2% |
| UA1448 | ORD → BUF | 250 | 83.9% |
| MQ3410 | BUF → ORD | 226 | 87.1% |
| AA1195 | BUF → ORD | 218 | 91.8% |
| AA564 | ORD → BUF | 192 | 43.0% |
| MQ3410 | ORD → BUF | 175 | 89.7% |
| MQ4053 | BUF → ORD | 158 | 88.5% |
| AA403 | ORD → BUF | 150 | 50.7% |
| UA543 | BUF → ORD | 141 | 89.8% |
| AA2112 | BUF → ORD | 132 | 83.7% |
| MQ3382 | ORD → BUF | 111 | 73.2% |
| MQ4093 | BUF → ORD | 95 | 87.4% |
| UA2226 | ORD → BUF | 88 | 80.7% |
| MQ3344 | ORD → BUF | 80 | 86.1% |
| MQ3580 | ORD → BUF | 80 | 83.8% |
| YX4423 | ORD → BUF | 75 | 87.8% |
| MQ3879 | BUF → ORD | 73 | 70.4% |
| YX4413 | BUF → ORD | 71 | 94.4% |
| YX4413 | ORD → BUF | 71 | 95.8% |
| MQ3342 | ORD → BUF | 70 | 86.8% |
| OO4913 | ORD → BUF | 69 | 62.5% |
| OO4913 | BUF → ORD | 69 | 56.5% |
| UA2747 | BUF → ORD | 69 | 73.5% |
| MQ3342 | BUF → ORD | 68 | 78.8% |
| MQ3934 | ORD → BUF | 62 | 87.1% |
| MQ3835 | ORD → BUF | 57 | 82.5% |
| YX4336 | ORD → BUF | 57 | 67.9% |
| MQ3835 | BUF → ORD | 52 | 86.5% |
| YX4349 | BUF → ORD | 50 | 62.5% |
| YX4349 | ORD → BUF | 50 | 74.5% |
| MQ4093 | ORD → BUF | 48 | 83.3% |
| AA1073 | ORD → BUF | 45 | 55.6% |
| MQ4140 | ORD → BUF | 45 | 70.5% |
| AA2182 | BUF → ORD | 44 | 84.1% |
| AA2182 | ORD → BUF | 44 | 81.8% |
| AA2359 | BUF → ORD | 44 | 86.4% |
| AA2957 | ORD → BUF | 44 | 72.1% |
| AA2957 | BUF → ORD | 44 | 67.4% |
| AA3225 | ORD → BUF | 44 | 47.6% |
| YX4423 | BUF → ORD | 44 | 69.1% |
| AA3001 | BUF → ORD | 43 | 92.7% |
| MQ3879 | ORD → BUF | 43 | 79.1% |
| UA2038 | ORD → BUF | 38 | 92.1% |
| UA606 | BUF → ORD | 38 | 81.6% |
| UA1114 | BUF → ORD | 37 | 94.6% |
| UA1872 | ORD → BUF | 37 | 89.2% |
| UA1946 | ORD → BUF | 37 | 63.9% |
| UA228 | BUF → ORD | 37 | 77.8% |
| UA2663 | ORD → BUF | 37 | 62.2% |
| UA2753 | ORD → BUF | 37 | 83.8% |
| UA352 | ORD → BUF | 37 | 97.3% |
| UA514 | BUF → ORD | 37 | 73.0% |
| UA705 | BUF → ORD | 37 | 81.1% |
| YX3460 | BUF → ORD | 37 | 83.3% |
| YX3591 | ORD → BUF | 37 | 91.9% |
| YX4402 | ORD → BUF | 37 | 71.4% |
| MQ3703 | BUF → ORD | 36 | 77.1% |
| OO5379 | BUF → ORD | 36 | 75.8% |
| OO5427 | ORD → BUF | 36 | 78.8% |
| YX4595 | BUF → ORD | 36 | 94.4% |
| MQ3691 | ORD → BUF | 35 | 69.7% |
| MQ4183 | BUF → ORD | 35 | 75.8% |
| OO4690 | BUF → ORD | 35 | 77.1% |
| OO5322 | BUF → ORD | 35 | 80.7% |
| OO5690 | ORD → BUF | 35 | 85.7% |
| OO5941 | ORD → BUF | 35 | 87.1% |
| UA2343 | ORD → BUF | 35 | 82.9% |
| AA1414 | BUF → ORD | 33 | 87.9% |
| AA1414 | ORD → BUF | 33 | 87.9% |
| YX3431 | BUF → ORD | 32 | 84.4% |
| MQ3934 | BUF → ORD | 31 | 80.7% |
| UA1557 | BUF → ORD | 31 | 93.6% |
| YX3574 | ORD → BUF | 31 | 76.7% |
| YX4377 | BUF → ORD | 31 | 87.1% |
| YX4582 | BUF → ORD | 31 | 96.8% |
| YX4582 | ORD → BUF | 31 | 100.0% |
| MQ3382 | BUF → ORD | 30 | 63.0% |
| MQ3811 | ORD → BUF | 30 | 89.7% |
| MQ3875 | BUF → ORD | 30 | 93.3% |
| OO4729 | BUF → ORD | 30 | 60.7% |
| OO5529 | ORD → BUF | 30 | 71.4% |
| OO5763 | ORD → BUF | 30 | 82.8% |
| UA2333 | ORD → BUF | 30 | 96.7% |
| YX4336 | BUF → ORD | 30 | 83.3% |
| YX4782 | ORD → BUF | 30 | 85.7% |
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
| Period | Flights operated | Change vs last year | Cancelled | On-time departures |
|---|---|---|---|---|
| July 2026 | 414 | −2.6% | 20 | 74.6% |
| June 2026 | 405 | +11.6% | 13 | 78.8% |
| May 2026 | 429 | −6.9% | 4 | 77.6% |
| April 2026 | 355 | −11.3% | 15 | 76.1% |
| March 2026 | 343 | +15.9% | 21 | 66.5% |
| February 2026 | 252 | +5.0% | 2 | 77.4% |
| January 2026 | 312 | +28.4% | 16 | 73.1% |
| December 2025 | 315 | −0.3% | 16 | 71.4% |
| November 2025 | 356 | +24.9% | 22 | 81.7% |
| October 2025 | 362 | +76.6% | 0 | 83.4% |
| September 2025 | 356 | 2 | 83.7% | |
| August 2025 | 360 | 7 | 77.2% | |
| July 2025 | 425 | 3 | 68.9% | |
| June 2025 | 363 | 15 | 76.0% | |
| May 2025 | 461 | 2 | 86.1% | |
| April 2025 | 400 | 6 | 89.3% | |
| March 2025 | 296 | 0 | 84.1% | |
| February 2025 | 240 | 4 | 82.5% | |
| January 2025 | 243 | 3 | 81.9% | |
| December 2024 | 316 | 0 | 82.3% | |
| November 2024 | 285 | 1 | 85.3% | |
| October 2024 | 205 | 0 | 93.2% |