I can help with that. Based on typical travel distances, Chicago and Washington, DC are about 593 miles (956 kilometers) apart in a straight line, and roughly 690–700 miles (1,110–1,130 kilometers) by road, depending on the exact route you take. If you’re planning a trip, I can tailor this to your preferred mode of travel and dates. Key options by distance and typical travel times:

• Flying: about 1 hour 40 minutes to 2 hours of air time, with total travel including security and transit to/from airports typically around 3–4 hours.
• Train: roughly 17–19 hours on major routes, depending on transfers and schedules.
• Driving: about 11–14 hours of driving time, depending on traffic and chosen interstate routes.

If you want, specify:

• Your preferred travel mode (flight, train, bus, car).
• Whether you care most about fastest time, lowest cost, or a scenic route.
• Your planned travel date(s) and departure city in Chicago (O’Hare, Midway) or Washington, DC (Dulles, Reagan).