Route · GSP → BWI · 2020–2025 BTS data
Greer to Baltimore
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), GSP to BWI (Greer to Baltimore) ranks #3655 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 85%
- On-time
- +6 pts
- vs US avg
- 62 min
- Delay when late
- 2,270
- Flights
- #3655 of 4927
- Corpus placement
Cancelled
0.6%
Best Month
Sep 2025 95%
Worst Month
Aug 2024 63%
Distance
426 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 60 | 8 | 1 | 0 | WN |
| Nov 2025 | 56 | 6 | 0 | 0 | WN |
| Oct 2025 | 58 | 3 | 0 | 0 | WN |
| Sep 2025 | 60 | 3 | 0 | 0 | WN |
| Aug 2025 | 62 | 8 | 0 | 0 | WN |
| Jul 2025 | 62 | 17 | 1 | 0 | WN |
| Jun 2025 | 60 | 14 | 0 | 0 | WN |
| May 2025 | 62 | 15 | 0 | 0 | WN |
| Apr 2025 | 60 | 10 | 0 | 0 | WN |
| Mar 2025 | 60 | 8 | 0 | 1 | WN |
| Feb 2025 | 46 | 9 | 0 | 0 | WN |
| Jan 2025 | 45 | 4 | 3 | 0 | WN |
| Dec 2024 | 60 | 15 | 0 | 1 | WN |
| Nov 2024 | 57 | 5 | 0 | 0 | WN |
| Oct 2024 | 62 | 8 | 0 | 0 | WN |
| Sep 2024 | 60 | 10 | 2 | 0 | WN |
| Aug 2024 | 62 | 23 | 1 | 0 | WN |
| Jul 2024 | 62 | 14 | 0 | 0 | WN |
| Jun 2024 | 58 | 3 | 0 | 0 | WN |
| May 2024 | 34 | 11 | 0 | 1 | WN |
| Apr 2024 | 34 | 8 | 0 | 0 | WN |
| Mar 2024 | 35 | 4 | 0 | 0 | WN |
| Jan 2024 | 31 | 4 | 0 | 0 | WN |
| Dec 2023 | 33 | 8 | 0 | 0 | WN |
GSP–BWI seasonal on-time pattern
Best: March (90.9%) · weakest: July (75.8%)
Strongest calendar month
March
90.9% on-time · ~37 flights/mo
Busiest calendar month
July
~47 flights/mo avg
Weakest calendar month
July
75.8% on-time · ~47 flights/mo
Cancellation Rate
0.6%
8 of 1,279 flights
Diversion Rate
0.2%
3 of 1,279 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
GSP - Greer
Full on-time, delay-cause, and seasonal performance for Greer, SC.
GSP on-time profileBWI - Baltimore
Full on-time, delay-cause, and seasonal performance for Baltimore, MD.
BWI on-time profileCompare the two airports
See GSP and BWI side by side on delays, cancellations, and reliability.
Compare GSP vs BWIOrigin-hub reliability standing
Among GSP's stronger departures
GSP → BWI posts a 85% on-time rate, landing in the ≥85% band with 9 of 14 BTS-tracked routes leaving Greer. The same hub also shows 5 mid-band and 0 challenged departures · fleet-wide on-time rank #1213 of 4927 (highest on-time = #1).
Similar routes
Other BTS-tracked routes with comparable performance or trip length to GSP–BWI.
Routes with a similar on-time rate
What the Data Says About GSP to BWI
Greer to Baltimore (GSP to BWI) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85% on-time rate across 2,270 flights, with delays that do happen averaging 62.2 minutes. The corridor runs roughly 426 miles and is served by 1 carrier. Over the most recent 24 months, 8 of 1,279 flights were cancelled (0.6%) and 3 diverted (0.2%).
The monthly split is wide on this route: Sep 2025 posted the strongest performance at 95% on-time, while Aug 2024 came in at just 63% - a 32-point swing worth factoring into travel timing.
On the multi-year calendar, GSP–BWI peaks in March at 90.9% on-time while July carries the heaviest traffic (~47 flights per month) ; the softest month is July at 75.8%, a 15.1-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does GSP to BWI rank among US routes by traffic? ▼
How often are flights delayed from GSP to BWI? ▼
What is the cancellation rate for GSP to BWI? ▼
How far is the flight from GSP to BWI? ▼
When is the best time to fly from GSP to BWI? ▼
Airports on this route
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Using GSP–BWI data
GSP–BWI runs 6 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare GSP and BWI airport profiles: delay causes and top routes differ even on the same corridor. GSP airport
- If your dates flex, March (90.9% on-time) beats July (75.8%) on this corridor. Seasonal chart
- 4 other routes post a similar 85% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.