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 May 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 44% of departures; flights ran 79% full.
Departures
442
May 2026
Seats
78,086
both directions
Passengers
61,700
both directions
Load factor
79.0%
RPM ÷ ASM
Who flies IAD–ORD?
United Airlines operated the most nonstop IAD–ORD departures in May 2026 (435), one of 3 carriers on the route.
- UA
435 departures · 77,464 seats
Share of departures98.4%79.5%
Load
- OO
5 departures · 250 seats
Share of departures1.1%0.0%
Load
- SY
2 departures · 372 seats
Share of departures0.5%26.1%
Load
What plane flies IAD–ORD?
In May 2026, the Boeing 737-900ER flew 44% of IAD–ORD departures — more than any other aircraft type.
- Boeing 737-900ER
196 departures · 80.2% load
44.3% - Airbus A321neo
62 departures · 83.1% load
14.0% - Boeing 737-800
44 departures · 74.1% load
10.0% - Boeing 757-200
40 departures · 79.3% load
9.0% - Boeing 737 MAX 9
34 departures · 79.0% load
7.7% - Boeing 737 MAX 8
30 departures · 75.5% load
6.8% - Airbus A320
10 departures · 80.8% load
2.3% - Airbus A319
10 departures · 85.5% load
2.3% - Boeing 757-300
7 departures · 57.8% load
1.6% - Bombardier CRJ-200
5 departures · 0.0% load
1.1% - Boeing 737-700
4 departures · 88.1% load
0.9%
How has IAD–ORD traffic changed?
Nonstop IAD–ORD departures rose from 379 in June 2025 to 442 in May 2026.
Monthly nonstop IAD–ORD traffic, trailing 12 months through May 2026. Bars scale to the busiest month; months with no filed service show as zero.
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
May 2026
442 departures · 61,700 passengers
79.0%
Load
By direction
Each direction is filed separately — they rarely match.
ORD → IAD
79.1% full
223 departures · 30,842 passengers
IAD → ORD
78.9% full
219 departures · 30,858 passengers
Nonstop IAD–ORD traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through May 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 May 2026, the Boeing 737-900ER flew the largest share of departures (44.3%), followed by the Airbus A321neo (14.0%).
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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