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Distance from Cornwall, CT to IAD Airport

Distance

343 mi

Time

7 hours 24 mins

Gas Cost

$32 - $62

Helpful Inaccurate

There are 294.97 miles from Cornwall to Washington Dulles International Airport (IAD) in southwest direction and 343 miles (552.00 kilometers) by car, following the I-95 and NJTP route.

Cornwall and IAD Airport are 7 hours 24 mins far apart, if you drive non-stop .

This is the fastest route from Cornwall, CT to IAD Airport. The halfway point is Lawnside, NJ.

Cornwall, CT and IAD Airport are in the same time zone (EDT). Current time in both locations is 3:37 pm.

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Lowest Price Rental Cars in Cornwall, CT

Planning on renting a car to go from Cornwall, CT to IAD Airport? Here there are some offers to rent a car in Cornwall, CT

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Cornwall »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 13.76 gallons of gas to cover the route between Cornwall, CT and IAD Airport.

The estimated cost of gas to go from Cornwall to IAD Airport is $44.88.

During the route, an average car will release 269.55 pounds of CO₂ to the atmosphere. The carbon footprint would be 0.79 pounds of CO₂ per mile.

Average USA gas price used for calculation is $3.26 per gallon of regular gas. Price last updated on March 12, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Cornwall, CT and IAD Airport

If you want to meet halfway between Cornwall, CT and IAD Airport or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 39.874741 and -75.016258, or 39º 52' 29.0676" N, 75º 0' 58.5288" W. This location is 171.29 miles away from Cornwall, CT and IAD Airport and it would take approximately 3 hours 42 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Lawnside, NJ, situated 183 miles from Cornwall, CT and 166 miles from IAD Airport. It would take 3 hours 28 mins to go from Cornwall to Lawnside and 2 hours 59 mins to go from IAD to Lawnside.

Major City Closest to Halfway Point

The major city closest to the halfway point between Cornwall, CT and IAD Airport is Philadelphia, PA, situated 188 miles from Cornwall, CT and 162 miles from IAD Airport. It would take 3 hours 36 mins to go from Cornwall to and 2 hours 59 mins to go from IAD to Philadelphia.