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
Filed traffic dataIn July 2026, United Airlines operated the most departures, one of 2 carriers flying nonstop IAD–ORD; the Boeing 737-900ER was the most common aircraft at 48% of departures; flights ran 84% full.
Departures
433
July 2026
Seats
78,134
both directions
Passengers
65,239
both directions
Load factor
83.5%
RPM ÷ ASM
Who flies IAD–ORD?
United Airlines operated the most nonstop IAD–ORD departures in July 2026 (431), one of 2 carriers on the route.
- UA
431 departures · 78,034 seats
Share of departures99.5%83.6%
Load
- OO
2 departures · 100 seats
Share of departures0.5%0.0%
Load
What plane flies IAD–ORD?
In July 2026, the Boeing 737-900ER flew 48% of IAD–ORD departures — more than any other aircraft type.
- Boeing 737-900ER
206 departures · 83.6% load
47.6% - Airbus A321neo
94 departures · 88.1% load
21.7% - Boeing 737 MAX 9
54 departures · 81.4% load
12.5% - Boeing 737 MAX 8
26 departures · 81.3% load
6.0% - Boeing 757-200
15 departures · 87.5% load
3.5% - Boeing 737-800
13 departures · 67.0% load
3.0% - Boeing 737-700
9 departures · 84.2% load
2.1% - Airbus A320
8 departures · 70.6% load
1.8% - Bombardier CRJ-200
2 departures · 0.0% load
0.5% - Boeing 767-300
2 departures · 94.6% load
0.5% - Boeing 757-300
2 departures · 69.9% load
0.5% - Airbus A319
1 departures · 96.0% load
0.2% - Boeing 787-10
1 departures · 48.1% load
0.2%
How has IAD–ORD traffic changed?
Nonstop IAD–ORD departures rose from 394 in August 2025 to 433 in July 2026.
Monthly nonstop IAD–ORD traffic, trailing 12 months through July 2026. Bars scale to the busiest month; months with no filed service show as zero.
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
May 2026
442 departures · 61,700 passengers
79.0%
Load
June 2026
423 departures · 65,181 passengers
86.2%
Load
July 2026
433 departures · 65,239 passengers
83.5%
Load
By direction
Each direction is filed separately — they rarely match.
ORD → IAD
79.6% full
220 departures · 31,322 passengers
IAD → ORD
87.4% full
213 departures · 33,917 passengers
Nonstop IAD–ORD traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through July 2026; filings from 2025. Public domain (US Government work).
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 July 2026, the Boeing 737-900ER flew the largest share of departures (47.6%), followed by the Airbus A321neo (21.7%).
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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