The cheapest times to fly from IAD to IAH are
- August 6th to February 25th (except the weeks of November 19th, November 26th, and December 17th)
based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from IAD to IAH is early September. Prices can be as high as $787 for Sunday flights during early to mid May, or as low as $272 for Tuesday flights around early September.
When to Fly to Houston
Flying from Washington, DC (IAD) to Houston, TX (IAH) will usually cost between $273 to $472 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early September with an average ticket price of $296. Due to high demand the most expensive time to fly is early to mid May, with an average price of $467. Planning your trip to low-cost times can easily save you $172 on economy flights and even more on first-class flights. Generally, any price below $360 can be considered a good price for a round-trip IAD to IAH flight.
See below for a graph of average weekly prices for the IAD to IAH route. All prices are for round-trip tickets in USD.
Compared to other flights, the IAD to IAH flight is much cheaper than the average and costs much less than the average flight leaving from Washington. The average price per mile (for a direct flight) is $0.19, which is below average.
Flight Prices by Day of the Week
Tuesday is usually the cheapest day to depart and return on this flight. Sundays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $78 (19%) on this flight.
Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $331. Return trip prices are from the IAH to IAD flight, and often highlight the quality of our data in showing the same trend.
Departing Prices by Day
Return Trip Prices by Day
Nonstop Flights and Layovers
Travelers looking to fly from IAD to IAH can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 3 hour 7 minutes may be realistic.
Alternative Nearby Airports
Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is a nonstop flight from IAD to IAH while comparing.
- 140 miles (225 km) away from IAH
- Usually 4.59% less expensive than IAH
- Nonstop flights available
- 79 miles (127 km) away from IAH
- Usually 2.02% less expensive than IAH
- 1-layover flights available
Flight Questions Answered
Still have questions about flying from IAD to IAH? We’ve got answers.
Which airlines fly this route?
You can find 6 major airlines flying this route most often: Alaska, American, Delta, Frontier, Qantas, United, and potentially more during busy seasons.
How far away is it from George Bush Intercontinental/Houston Airport to Washington Dulles International Airport?
The distance between the two airports is roughly 1189 miles or 1914 kilometers.
How long does it take to fly from IAD to IAH?
The real-world flight time for a nonstop IAD to IAH flight is about 3 hour 7 minutes.
How many flights go between Washington, DC and Houston, TX?
It depends on the day of the week and the date, but a typical day might have around 57 available flights from IAD to IAH.
Airport Location Info
|Origination airport name||Washington Dulles International Airport|
|Country||the United States|
|Destination airport name||George Bush Intercontinental/Houston Airport|
|Country||the United States|
Late and Early Flight Data
Flights from IAD to IAH tend to depart as late as the average flight. According to our recently updated data, 30% of flights departed 5 or more minutes late, and 12% of flights left 5 or more minutes early. On average you can expect to leave IAH heading for IAD about 12 minutes late. This does significantly impact arrival time, as the average landing time in Houston, TX is about 6 minutes late. The numbers below show a recent average of take-off times versus the scheduled departure flight:
- United: 12 minutes late
- Some airlines not reporting
Flights to IAH
Flights from IAH
Flights to IAD
Flights from IAD
Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.