Dulles (IAD) to Louisville (SDF)
Flight time
≈ 1h 42m
Bearing
266° W
Dulles (IAD) to Louisville (SDF) is 450 miles (725 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies IAD–SDF
US DOT T-100 · filed dataIn April 2026, Mesa Airlines operated the most departures, one of 3 carriers flying nonstop IAD–SDF; the Embraer E175 was the most common aircraft at 98% of departures; flights ran 79% full.
Departures
121
April 2026
Seats
8,948
both directions
Passengers
7,113
both directions
Load factor
79.5%
passengers ÷ seats
Who flies IAD–SDF?
Mesa Airlines operated the most nonstop IAD–SDF departures in April 2026 (117), one of 3 carriers on the route.
- YV
Mesa Airlines
117 departures · 8,544 seats
Share of departures96.7%79.9%
Load
- UA
United Airlines
2 departures · 252 seats
Share of departures1.7%70.6%
Load
- YX
Republic Airways
2 departures · 152 seats
Share of departures1.7%71.7%
Load
What plane flies IAD–SDF?
In April 2026, the Embraer E175 flew 98% of IAD–SDF departures — more than any other aircraft type.
- Embraer E175
119 departures · 79.8% load
98.4% - Boeing 737-700
1 departures · 93.7% load
0.8% - Airbus A319
1 departures · 47.6% load
0.8%
How has IAD–SDF traffic changed?
Nonstop IAD–SDF departures fell from 185 in May 2025 to 121 in April 2026.
Monthly nonstop IAD–SDF traffic, trailing 12 months through April 2026. Bars scale to the busiest month; months with no filed service show as zero.
May 2025
185 departures · 11,803 passengers
82.5%
Load
June 2025
177 departures · 11,392 passengers
86.4%
Load
July 2025
241 departures · 13,393 passengers
73.6%
Load
August 2025
215 departures · 9,957 passengers
62.0%
Load
September 2025
167 departures · 9,297 passengers
75.0%
Load
October 2025
124 departures · 7,623 passengers
83.7%
Load
November 2025
118 departures · 6,748 passengers
76.6%
Load
December 2025
126 departures · 7,002 passengers
76.4%
Load
January 2026
118 departures · 5,999 passengers
68.6%
Load
February 2026
107 departures · 6,187 passengers
79.1%
Load
March 2026
125 departures · 7,258 passengers
79.4%
Load
April 2026
121 departures · 7,113 passengers
79.5%
Load
By direction
The DOT files each direction separately — they rarely match.
IAD → SDF
81.2% full
61 departures · 3,678 passengers
SDF → IAD
77.8% full
60 departures · 3,435 passengers
Nonstop IAD–SDF traffic has been filed with the US DOT since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through April 2026; filings from 2025. Public domain (US Government work). The DOT publishes roughly three months in arrears.
The airports
Louisville
US
Louisville Muhammad Ali International Airport
Coordinates
38.17°N, 85.74°W
Hemisphere
N · W
Frequently asked
How far is Dulles (IAD) from Louisville (SDF)?
IAD to SDF is 450 miles (725 km / 391 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from IAD to SDF?
A nonstop covers the 450-mile great-circle distance in roughly 1h 42m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies IAD–SDF?
In April 2026, the Embraer E175 flew the largest share of departures (98.4%), followed by the Boeing 737-700 (0.8%).
What mileage do I earn flying IAD–SDF?
Distance-based programs credit off the 450-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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