Dulles (IAD) to Chicago (ORD)
Flight time
≈ 1h 58m
Bearing
294° NW
Dulles (IAD) to Chicago (ORD) is 587 miles (945 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies IAD–ORD
US DOT T-100 · filed dataIn April 2026, United Airlines operated the most departures, one of 3 carriers flying nonstop IAD–ORD; the Boeing 737-900ER was the most common aircraft at 36% of departures; flights ran 77% full.
Departures
375
April 2026
Seats
65,573
both directions
Passengers
50,568
both directions
Load factor
77.1%
passengers ÷ seats
Who flies IAD–ORD?
United Airlines operated the most nonstop IAD–ORD departures in April 2026 (364), one of 3 carriers on the route.
- UA
United Airlines
364 departures · 64,979 seats
Share of departures97.1%77.6%
Load
- OO
SkyWest Airlines
9 departures · 450 seats
Share of departures2.4%0.0%
Load
- DL
Delta Air Lines
2 departures · 144 seats
Share of departures0.5%80.6%
Load
What plane flies IAD–ORD?
In April 2026, the Boeing 737-900ER flew 36% of IAD–ORD departures — more than any other aircraft type.
- Boeing 737-900ER
134 departures · 84.4% load
35.7% - Airbus A321neo
60 departures · 66.0% load
16.0% - Boeing 757-200
57 departures · 80.3% load
15.2% - Boeing 737 MAX 9
46 departures · 76.1% load
12.3% - Boeing 737 MAX 8
34 departures · 70.0% load
9.1% - Boeing 737-800
14 departures · 81.9% load
3.7% - Boeing 737-700
13 departures · 79.5% load
3.5% - Bombardier CRJ-200
8 departures · 0.0% load
2.1% - Airbus A319
3 departures · 84.9% load
0.8% - Boeing 757-300
3 departures · 63.5% load
0.8% - Airbus A320
1 departures · 86.0% load
0.3% - Bombardier CRJ-550
1 departures · 0.0% load
0.3% - Boeing 787-8
1 departures · 84.4% load
0.3%
How has IAD–ORD traffic changed?
Nonstop IAD–ORD departures fell from 378 in May 2025 to 375 in April 2026.
Monthly nonstop IAD–ORD traffic, trailing 12 months through April 2026. Bars scale to the busiest month; months with no filed service show as zero.
May 2025
378 departures · 56,571 passengers
86.0%
Load
June 2025
379 departures · 59,778 passengers
87.4%
Load
July 2025
382 departures · 58,942 passengers
85.7%
Load
August 2025
394 departures · 57,703 passengers
82.0%
Load
September 2025
410 departures · 53,115 passengers
73.5%
Load
October 2025
357 departures · 51,151 passengers
80.8%
Load
November 2025
303 departures · 41,342 passengers
78.7%
Load
December 2025
306 departures · 42,846 passengers
81.6%
Load
January 2026
269 departures · 31,411 passengers
68.7%
Load
February 2026
226 departures · 28,775 passengers
71.6%
Load
March 2026
307 departures · 44,241 passengers
80.7%
Load
April 2026
375 departures · 50,568 passengers
77.1%
Load
By direction
The DOT files each direction separately — they rarely match.
ORD → IAD
76.1% full
190 departures · 25,302 passengers
IAD → ORD
78.2% full
185 departures · 25,266 passengers
Nonstop IAD–ORD 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
Frequently asked
How far is Dulles (IAD) from Chicago (ORD)?
IAD to ORD is 587 miles (945 km / 510 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from IAD to ORD?
A nonstop covers the 587-mile great-circle distance in roughly 1h 58m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies IAD–ORD?
In April 2026, the Boeing 737-900ER flew the largest share of departures (35.7%), followed by the Airbus A321neo (16.0%).
What mileage do I earn flying IAD–ORD?
Distance-based programs credit off the 587-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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