Check-in at IAD can be crowded in the afternoon and evening. Arrive early to navigate the busy area efficiently.

Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $142 (CheapOair) |
One-way from | $74 (Trip.com) |
Popular in | December |
Cheapest in | September |
Average price | $400 |
Good round-trip deal | $373 or less |
Good one-way deal | $174 or less |
Fly from
Fly to
Route
Depart
Return
Price
Washington, D.C.Houston
IAD - IAH
IADIAH
Washington, D.C. Dulles Intl
mié. 1/28
10:11 am-3:18 pm
1 stop6h 07m
Houston George Bush Intcntl
dom. 2/1
5:25 am-11:44 am
1 stop5h 19m
Washington, D.C.Houston
IAD - IAH
IADIAH
Washington, D.C. Dulles Intl
mié. 1/28
5:45 pm-8:31 pm
Nonstop3h 46m
Houston George Bush Intcntl
dom. 2/1
6:20 pm-10:18 pm
Nonstop2h 58m
Washington, D.C.Houston
IAD - IAH
IADIAH
Washington, D.C. Dulles Intl
mar. 1/27
6:03 am-8:45 am
Nonstop3h 42m
Houston George Bush Intcntl
dom. 2/1
6:20 pm-10:18 pm
Nonstop2h 58m
Washington, D.C.Houston
IAD - IAH
IADIAH
Washington, D.C. Dulles Intl
mié. 1/14
12:42 pm-5:22 pm
1 stop5h 40m
Houston George Bush Intcntl
mié. 1/28
12:10 pm-4:14 pm
Nonstop3h 04m
Washington, D.C.Houston
IAD - IAH
IADIAH
Washington, D.C. Dulles Intl
jue. 1/1
6:08 am-8:50 am
Nonstop3h 42m
Houston George Bush Intcntl
sáb. 1/10
5:00 am-11:46 am
1 stop5h 46m
Washington, D.C.Houston
IAD - IAH
IADIAH
Washington, D.C. Dulles Intl
mié. 12/24
12:50 pm-5:25 pm
1 stop5h 35m
Houston George Bush Intcntl
mar. 12/30
7:50 pm-11:49 pm
Nonstop2h 59m
Washington, D.C.Houston
IAD - IAH
IADIAH
Washington, D.C. Dulles Intl
mar. 12/9
6:00 am-10:41 am
1 stop5h 41m
Houston George Bush Intcntl
mié. 12/10
4:28 pm-12:12 am
1 stop6h 44m
Washington, D.C.Houston
IAD - IAH
IADIAH
Washington, D.C. Dulles Intl
vie. 12/12
6:30 am-11:50 am
1 stop6h 20m
Houston George Bush Intcntl
dom. 12/14
6:14 pm-10:15 pm
Nonstop3h 01m
Washington, D.C.Houston
IAD - IAH
IADIAH
Washington, D.C. Dulles Intl
jue. 12/18
10:15 pm-12:57 am
Nonstop3h 42m
Houston George Bush Intcntl
lun. 12/22
6:20 pm-10:19 pm
Nonstop2h 59m
Washington, D.C.Houston
IAD - IAH
IADIAH
Washington, D.C. Dulles Intl
jue. 1/29
12:42 pm-5:22 pm
1 stop5h 40m
Houston George Bush Intcntl
dom. 2/1
4:50 pm-8:49 pm
Nonstop2h 59m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
The best time to book flights from Washington, D.C. Dulles Intl Airport to Houston George Bush Intcntl Airport is 89 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Houston George Bush Intcntl Airport (average of $147). Flying from Washington, D.C. Dulles Intl Airport to Houston George Bush Intcntl Airport in January is currently the most expensive (average of $269). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
When flying from Washington, D.C. Dulles Intl Airport to Houston George Bush Intcntl Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 35% versus a flight at noon.
Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Houston George Bush Intcntl Airport flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
About 13% of weekly flights between Washington, D.C. and Houston have experienced delays in the past year, with the average delay time being 153 minutes.
Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
Tuesday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Over the last year, Air Canada have had the lowest number of delays on this route, with no flights being classified as delayed.
Entertainment
Comfort
Boarding
Food
Crew
Overall
Reviews
Tim,Sep 2025
IAD - GSP
Entertainment
Comfort
Boarding
Food
Crew
Overall
Reviews
Tim,Sep 2025
IAD - GSP
Entertainment
Comfort
Boarding
Food
Crew
Overall
Reviews
Tim,Sep 2025
IAD - GSP
Entertainment
Comfort
Boarding
Food
Crew
Overall
Reviews
Tim,Sep 2025
IAD - GSP
Entertainment
Comfort
Boarding
Food
Crew
Overall
Reviews
Tim,Sep 2025
IAD - GSP
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$91 | Average$150 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$151 | Average$189 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$236 | Average$399 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$253 | Average$377 | FlexibilityNo cancel fee | On-time69% |