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685 km · Domestic

Baltimore/Washington International Thurgood Marshall (BWI) – Greenville-Spartanburg (GSP)

In July 2026, 120 flights operated between Baltimore/Washington International Thurgood Marshall and Greenville-Spartanburg (both directions), and 60.8% 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
January85112▲ 31.8%
February92108▲ 17.4%
March120123▲ 2.5%
April1201200.0%
May1241240.0%
June1191190.0%
July122120▼ 1.6%
August124––
September120––
October116–in progress
November112––
December119––
Year to date (Jan–Jul)782826▲ 5.6%

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
January84.7%93.8%▲ 10.7%
February84.8%86.1%▲ 1.5%
March83.3%87.0%▲ 4.4%
April84.2%89.2%▲ 5.9%
May70.2%77.4%▲ 10.3%
June68.9%72.3%▲ 4.9%
July65.6%60.8%▼ 7.3%
August87.1%––
September92.5%––
October86.2%–in progress
November86.6%––
December82.4%––
Year-to-date average (Jan–Jul)77.4%80.9%▲ 4.6%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January512▲ 140.0%
February04–
March00–
April00–
May00–
June110.0%
July24▲ 100.0%
August0––
September0––
October0–in progress
November0––
December1––
Year to date (Jan–Jul)821▲ 162.5%

By direction

BWI → GSP

Scheduled flights
1,272
Flights operated
1,257
Cancelled
15 · 1.2%
On-time departures
78.1%

GSP → BWI

Scheduled flights
1,271
Flights operated
1,256
Cancelled
15 · 1.2%
On-time departures
83.0%

BWI → GSP and GSP → BWI counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Southwest Airlines WN 2,543 100.0% 80.5% 30

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 delay07:00–08:00-2.0min · 258 recorded · 255 measured
Gap to highest-delay hour32.5min07:00 ↔ 20:00
Recorded flights2,543BWI–GSP

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 · Fewer than 200 measured departures · 26 recorded · 26 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 46 recorded · 46 measured · Source: the US BTS 07:00 · 97.7% · 258 recorded · 255 measured · Source: the US BTS 08:00 · 93.5% · 711 recorded · 704 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 99 recorded · 99 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 29 recorded · 28 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 146 recorded · 146 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 9 recorded · 9 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 180 recorded · 180 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 12 recorded · 12 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 74 recorded · 73 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 44 recorded · 42 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 96 recorded · 95 measured · Source: the US BTS 18:00 · 80.8% · 284 recorded · 276 measured · Source: the US BTS 19:00 · 66.7% · 208 recorded · 207 measured · Source: the US BTS 20:00 · 56.4% · 279 recorded · 275 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 39 recorded · 37 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 3 recorded · 3 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 · Fewer than 200 measured departures · 26 recorded · 26 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 46 recorded · 46 measured · Source: the US BTS 07:00 · -2.0 min · 258 recorded · 255 measured · Source: the US BTS 08:00 · 0.4 min · 711 recorded · 704 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 99 recorded · 99 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 29 recorded · 28 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 146 recorded · 146 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 9 recorded · 9 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 180 recorded · 180 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 12 recorded · 12 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 74 recorded · 73 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 44 recorded · 42 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 96 recorded · 95 measured · Source: the US BTS 18:00 · 9.9 min · 284 recorded · 276 measured · Source: the US BTS 19:00 · 27.5 min · 208 recorded · 207 measured · Source: the US BTS 20:00 · 30.5 min · 279 recorded · 275 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 39 recorded · 37 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 3 recorded · 3 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 · 26 · 26 recorded · 26 measured · Source: the US BTS 06:00 · 46 · 46 recorded · 46 measured · Source: the US BTS 07:00 · 258 · 258 recorded · 255 measured · Source: the US BTS 08:00 · 711 · 711 recorded · 704 measured · Source: the US BTS 09:00 · 99 · 99 recorded · 99 measured · Source: the US BTS 10:00 · 29 · 29 recorded · 28 measured · Source: the US BTS 11:00 · 146 · 146 recorded · 146 measured · Source: the US BTS 12:00 · 9 · 9 recorded · 9 measured · Source: the US BTS 13:00 · 180 · 180 recorded · 180 measured · Source: the US BTS 14:00 · 12 · 12 recorded · 12 measured · Source: the US BTS 15:00 · 74 · 74 recorded · 73 measured · Source: the US BTS 16:00 · 44 · 44 recorded · 42 measured · Source: the US BTS 17:00 · 96 · 96 recorded · 95 measured · Source: the US BTS 18:00 · 284 · 284 recorded · 276 measured · Source: the US BTS 19:00 · 208 · 208 recorded · 207 measured · Source: the US BTS 20:00 · 279 · 279 recorded · 275 measured · Source: the US BTS 21:00 · 39 · 39 recorded · 37 measured · Source: the US BTS 22:00 · 3 · 3 recorded · 3 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———
05:00Fewer than 200 measured departures—2626
06:00Fewer than 200 measured departures—4646
07:0097.7%-2.0 min255258
08:0093.5%0.4 min704711
09:00Fewer than 200 measured departures—9999
10:00Fewer than 200 measured departures—2829
11:00Fewer than 200 measured departures—146146
12:00Fewer than 200 measured departures—99
13:00Fewer than 200 measured departures—180180
14:00Fewer than 200 measured departures—1212
15:00Fewer than 200 measured departures—7374
16:00Fewer than 200 measured departures—4244
17:00Fewer than 200 measured departures—9596
18:0080.8%9.9 min276284
19:0066.7%27.5 min207208
20:0056.4%30.5 min275279
21:00Fewer than 200 measured departures—3739
22:00Fewer than 200 measured departures—33
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 73.9% · 370 recorded · 364 measured · Source: the US BTS Tuesday · 85.7% · 360 recorded · 357 measured · Source: the US BTS Wednesday · 85.2% · 357 recorded · 357 measured · Source: the US BTS Thursday · 81.4% · 366 recorded · 366 measured · Source: the US BTS Friday · 79.2% · 369 recorded · 366 measured · Source: the US BTS Saturday · 81.8% · 349 recorded · 341 measured · Source: the US BTS Sunday · 76.8% · 372 recorded · 362 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 · 16.5 min · 370 recorded · 364 measured · Source: the US BTS Tuesday · 6.0 min · 360 recorded · 357 measured · Source: the US BTS Wednesday · 6.8 min · 357 recorded · 357 measured · Source: the US BTS Thursday · 11.4 min · 366 recorded · 366 measured · Source: the US BTS Friday · 11.2 min · 369 recorded · 366 measured · Source: the US BTS Saturday · 10.7 min · 349 recorded · 341 measured · Source: the US BTS Sunday · 13.0 min · 372 recorded · 362 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 · 370 · 370 recorded · 364 measured · Source: the US BTS Tuesday · 360 · 360 recorded · 357 measured · Source: the US BTS Wednesday · 357 · 357 recorded · 357 measured · Source: the US BTS Thursday · 366 · 366 recorded · 366 measured · Source: the US BTS Friday · 369 · 369 recorded · 366 measured · Source: the US BTS Saturday · 349 · 349 recorded · 341 measured · Source: the US BTS Sunday · 372 · 372 recorded · 362 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday73.9%16.5 min364370
Tuesday85.7%6.0 min357360
Wednesday85.2%6.8 min357357
Thursday81.4%11.4 min366366
Friday79.2%11.2 min366369
Saturday81.8%10.7 min341349
Sunday76.8%13.0 min362372

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 · Fewer than 200 measured departures · 214 recorded · 197 measured · Source: the US BTS Feb · 85.5% · 204 recorded · 200 measured · Source: the US BTS Mar · 85.2% · 243 recorded · 243 measured · Source: the US BTS Apr · 86.7% · 240 recorded · 240 measured · Source: the US BTS May · 73.8% · 248 recorded · 248 measured · Source: the US BTS Jun · 70.6% · 240 recorded · 238 measured · Source: the US BTS Jul · 63.2% · 248 recorded · 242 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 124 recorded · 124 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 120 recorded · 120 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 196 recorded · 196 measured · Source: the US BTS Nov · 85.8% · 226 recorded · 226 measured · Source: the US BTS Dec · 77.0% · 240 recorded · 239 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 · Fewer than 200 measured departures · 214 recorded · 197 measured · Source: the US BTS Feb · 6.3 min · 204 recorded · 200 measured · Source: the US BTS Mar · 13.1 min · 243 recorded · 243 measured · Source: the US BTS Apr · 5.9 min · 240 recorded · 240 measured · Source: the US BTS May · 14.3 min · 248 recorded · 248 measured · Source: the US BTS Jun · 19.5 min · 240 recorded · 238 measured · Source: the US BTS Jul · 24.4 min · 248 recorded · 242 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 124 recorded · 124 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 120 recorded · 120 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 196 recorded · 196 measured · Source: the US BTS Nov · 5.3 min · 226 recorded · 226 measured · Source: the US BTS Dec · 11.2 min · 240 recorded · 239 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 · 214 · 214 recorded · 197 measured · Source: the US BTS Feb · 204 · 204 recorded · 200 measured · Source: the US BTS Mar · 243 · 243 recorded · 243 measured · Source: the US BTS Apr · 240 · 240 recorded · 240 measured · Source: the US BTS May · 248 · 248 recorded · 248 measured · Source: the US BTS Jun · 240 · 240 recorded · 238 measured · Source: the US BTS Jul · 248 · 248 recorded · 242 measured · Source: the US BTS Aug · 124 · 124 recorded · 124 measured · Source: the US BTS Sep · 120 · 120 recorded · 120 measured · Source: the US BTS Oct · 196 · 196 recorded · 196 measured · Source: the US BTS Nov · 226 · 226 recorded · 226 measured · Source: the US BTS Dec · 240 · 240 recorded · 239 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
JanFewer than 200 measured departures—197214
Feb85.5%6.3 min200204
Mar85.2%13.1 min243243
Apr86.7%5.9 min240240
May73.8%14.3 min248248
Jun70.6%19.5 min238240
Jul63.2%24.4 min242248
AugFewer than 200 measured departures—124124
SepFewer than 200 measured departures—120120
OctFewer than 200 measured departures—196196
Nov85.8%5.3 min226226
Dec77.0%11.2 min239240

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 79.6% 2,024
  • Delayed >15 min 19.2% 489
  • Cancelled 1.2% 30
  • 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

35
35 of 35
Flight numbersBy direction DeparturesOn time
WN3665 GSP → BWI 74 98.6%
WN2560 BWI → GSP 61 77.1%
WN2988 GSP → BWI 61 95.1%
WN1727 BWI → GSP 58 87.9%
WN2243 GSP → BWI 58 91.4%
WN3281 BWI → GSP 58 96.6%
WN3312 BWI → GSP 58 65.5%
WN4574 BWI → GSP 58 92.9%
WN1143 BWI → GSP 57 73.7%
WN1772 GSP → BWI 57 94.3%
WN1899 GSP → BWI 57 89.5%
WN4009 BWI → GSP 51 66.0%
WN1350 BWI → GSP 50 84.0%
WN2244 GSP → BWI 50 82.0%
WN2247 BWI → GSP 50 76.0%
WN6315 BWI → GSP 50 91.8%
WN2119 GSP → BWI 47 93.0%
WN2605 BWI → GSP 47 83.7%
WN3008 GSP → BWI 46 97.8%
WN3587 GSP → BWI 46 68.9%
WN186 BWI → GSP 45 84.4%
WN662 GSP → BWI 43 60.5%
WN1460 GSP → BWI 42 88.1%
WN2737 GSP → BWI 42 92.9%
WN2759 BWI → GSP 42 83.3%
WN4437 BWI → GSP 42 42.5%
WN2014 GSP → BWI 34 94.1%
WN952 BWI → GSP 34 58.8%
WN1327 BWI → GSP 33 69.7%
WN1517 BWI → GSP 33 93.9%
WN1699 GSP → BWI 33 100.0%
WN3029 GSP → BWI 33 87.9%
WN3412 GSP → BWI 33 97.0%
WN4303 BWI → GSP 33 60.6%
WN2352 BWI → GSP 31 83.9%

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 120 −1.6% 4 60.8%
June 2026 119 +0.0% 1 72.3%
May 2026 124 +0.0% 0 77.4%
April 2026 120 +0.0% 0 89.2%
March 2026 123 +2.5% 0 87.0%
February 2026 108 +17.4% 4 86.1%
January 2026 112 +31.8% 12 93.8%
December 2025 119 −0.8% 1 82.4%
November 2025 112 −1.8% 0 86.6%
October 2025 116 +45.0% 0 86.2%
September 2025 120 0 92.5%
August 2025 124 0 87.1%
July 2025 122 2 65.6%
June 2025 119 1 68.9%
May 2025 124 0 70.2%
April 2025 120 0 84.2%
March 2025 120 0 83.3%
February 2025 92 0 84.8%
January 2025 85 5 84.7%
December 2024 120 0 71.7%
November 2024 114 0 85.1%
October 2024 80 0 75.0%

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