Best Flights starting from $250
from$250economy
Washington, D.C. (IAD)
Sat, May 30
Roundtrip
Houston (IAH)
Tue, Jun 2
from$250economy
Washington, D.C. (IAD)
Sun, May 31
Roundtrip
Houston (IAH)
Wed, Jun 3
Fields updated — click View Prices to search ↑
Other Destinations
Washington, D.C. (IAD) to Atlanta (ATL) in May from $74
From $74
Washington, D.C. (IAD) to Charlotte (CLT) in May from $90
From $90
Washington, D.C. (IAD) to Orlando (MCO) in May from $98
From $98
Washington, D.C. (IAD) to Denver (DEN) in May from $156
From $156
Washington, D.C. (IAD) to Seattle (SEA) in May from $159
From $159
Washington, D.C. (IAD) to Tampa (Any) in May from $160
From $160
Flights from Other Cities
New York (LGA) to Houston (IAH) in May from $55
From $55
Fort Lauderdale (Any) to Houston (IAH) in May from $56
From $56
Chicago (ORD) to Houston (IAH) in May from $62
From $62
Atlanta (ATL) to Houston (IAH) in May from $77
From $77
Detroit (DTW) to Houston (IAH) in May from $88
From $88
New York (Any) to Houston (IAH) in May from $92
From $92
✈️ Flight Guide: Washington, D.C. (IAD) → Houston (IAH)
Complete travel information for your May journey
May is a transitional travel month for the IAD → IAH route: spring temperatures in the Washington, DC area warm up, while Houston begins to feel late-spring humidity and showers. For travelers departing Washington Dulles International Airport (IAD), expect multiple United nonstop options and several one-stop itineraries operated by Delta and American via hubs like ATL, CLT, and DFW. If you plan to travel in May (especially around Memorial Day), book 3–8 weeks in advance for the best cheap flights IAD to IAH, sign up for fare alerts, and consider midweek departures to lower costs. Pack layers for variable Dulles spring mornings and bring a light rain jacket for Houston's often humid afternoons. CTA: Search nonstop IAD to IAH flights now and set a fare alert to catch May deals.
Departing from Washington, D.C. (IAD) FAQs
The average nonstop flight time from Washington Dulles International Airport (IAD) to George Bush Intercontinental Airport (IAH) is about 3 hours 15 minutes to 3 hours 40 minutes. Seasonal winds and May weather can slightly alter flight time, and connecting itineraries via Atlanta, Charlotte, or Dallas will add 1–4+ hours depending on layovers. Check live flight trackers and airline schedules for day-of-travel updates.
Yes — multiple carriers, most notably United Airlines, typically operate nonstop flights between Washington Dulles International Airport (IAD) and George Bush Intercontinental Airport (IAH) in May. Frequency can be 1–4 nonstop flights per day depending on demand, weekdays, and Memorial Day weekend traffic. For the best nonstop availability, book early and filter search results for nonstop or direct flights.
To find cheap flights IAD to IAH in May, search 3–8 weeks in advance for standard May dates but book earlier if traveling over Memorial Day weekend. Use fare alerts, flexible-date searches, and compare United, American (via connecting routes), and Delta (connections). Consider Tuesdays and Wednesdays for lower fares and check nearby airports like Ronald Reagan Washington National (DCA) and Baltimore/Washington Thurgood Marshall (BWI) for alternative routing. Sign up for airline newsletters and consider midweek departures to lock in lower prices.
Luggage and carry-on allowances depend on the airline and fare class. United (a major operator at IAD) often includes one carry-on and a personal item; checked bag fees apply for basic economy and some main cabin fares. For May travel, expect typical domestic baggage rules: first checked bag fee around $30–35 on many carriers. Always confirm on your ticket and pack according to airline size limits to avoid gate fees. Consider TSA PreCheck for faster security at IAD.
Washington Dulles International Airport (IAD) offers a range of parking options including hourly, daily, and economy lots with shuttle service; rates can rise during peak May weekends like Memorial Day. Ride-hailing, shuttles, and Metrobus connections operate to nearby Fairfax County, Arlington, and Washington, DC. If flying in May, reserve long-term parking in advance for better rates and allow extra time for airport shuttles and security lines.
In May, travel from Washington Dulles International Airport (IAD) is generally smooth but can be affected by spring storms and occasional runway construction projects. High travel days include Memorial Day weekend, which may increase security wait times and TSA lines. Check airport advisories, sign up for airline notifications, and arrive at least 90–120 minutes for domestic flights during busy holiday weekends.
Arriving at George Bush Intercontinental Airport (IAH) in May means warm, humid weather and the possibility of afternoon thunderstorms. Plan ground transfers in advance — ride-shares and taxis are plentiful, but prebook shuttles for groups and allow extra travel time during event weekends. If you're visiting nearby destinations like Galveston or Austin after landing, consider renting a car at IAH for flexibility. Score cheap flights to IAH in May by setting fare alerts and avoiding peak holiday departure dates; for Memorial Day travel, secure tickets earlier than usual. CTA: Compare May arrivals to IAH and book parking or shuttles now to save on ground transfers.
Arriving at Houston (IAH) FAQs
In May, Houston and the George Bush Intercontinental Airport (IAH) area typically experience warm to hot temperatures with rising humidity and occasional afternoon thunderstorms. Average daytime highs are in the mid-80s°F (around 29°C), while evenings are mild. Travelers should prepare for sudden rain showers and pack light, breathable clothing plus an umbrella or rain jacket.
From George Bush Intercontinental Airport (IAH), options to downtown Houston include taxi, ride-share (Uber/Lyft), airport shuttle services, shared vans, and rental cars. METRO operates regional bus services and the planned high-speed rail projects may not affect May travel, so expect common ride-share surge pricing during peak May events. For faster transfers, prebook an airport shuttle or use a scheduled shared van for groups.
Yes — airlines often run targeted fare sales for domestic routes into Houston in early May and around Memorial Day, but prices can spike for last-minute Memorial Day weekend travel. To capture deals, sign up for airline newsletters, use flexible-date searches, and compare fares from nearby airports. Booking 4–8 weeks ahead of high-demand May weekends usually yields the best balance of price and schedule choice.
George Bush Intercontinental Airport (IAH) serves Houston and is a convenient gateway to nearby major cities and destinations including Galveston, Austin, San Antonio, Dallas/Fort Worth, New Orleans, and the Texas Gulf Coast. Many travelers use IAH as a hub to connect to domestic and international flights, or to reach Texas attractions such as the Space Center, Galveston beaches, and the Hill Country.
IAH offers a broad selection of amenities including multiple airline lounges (United Clubs), lounges operated by Priority Pass partners, a variety of restaurants and coffee shops, charging stations, and family traveler services. In May, several seasonal pop-ups and local food options are often featured; check terminal maps and lounge access rules before you travel. If you need quiet workspace or showers, verify availability with your lounge program.
Security wait times at George Bush Intercontinental Airport (IAH) can increase during May's busy periods like Memorial Day weekend and major events. For domestic arrivals, allow time for luggage pick-up and ground transportation; for international arrivals connecting through IAH, factor in customs and immigration processing. Enroll in trusted traveler programs (TSA PreCheck for domestic departures) and check airport wait-time estimators on busy travel days.
1.0.2605.17
May Events & Festivals Affecting IAD–IAH Travel — Washington & Houston Highlights
May features travel drivers that influence IAD–IAH fares and capacity. Memorial Day weekend increases demand for both departure and arrival airports, so prices and parking fees may rise. Houston hosts Cinco de Mayo celebrations and often late-spring arts festivals (such as Bayou City Art Festival weekends), which boost inbound traffic to George Bush Intercontinental Airport (IAH). On the Washington side, May graduation ceremonies and spring events may increase outbound traffic from Washington Dulles International Airport (IAD). Travelers should book early for May festivals and consider midweek itineraries to avoid premium holiday pricing. CTA: Check event dates and secure flights and parking early for May festivals and long weekends.
Best Time to Fly IAD to IAH — May Recommendations
For May travel from Washington Dulles International Airport (IAD) to George Bush Intercontinental Airport (IAH), the best times to fly are midweek (Tuesday–Thursday) and early-morning departures. These slots generally yield lower prices and fewer weather-related or air-traffic delays. Avoid flying on the Thursday–Sunday window around Memorial Day to reduce cost and congestion. If flexibility is possible, compare adjacent dates in late April and early June where fares can sometimes be cheaper. CTA: Use flexible date search tools to identify the cheapest May travel days for IAD–IAH.
Direct vs Connecting Flights IAD to IAH — Pros & Cons for May Travel
Nonstop flights between Washington Dulles International Airport (IAD) and George Bush Intercontinental Airport (IAH) save time (roughly 3h20m) and reduce the risk of missed connections, making them ideal for business travelers and short trips. Connecting flights can be cheaper but add layover time and increase disruption risk, especially during May storms or holiday travel periods. If cost is a priority and you have flexible time, connecting via hubs like Atlanta or Charlotte can lower fares. For reliability and fast transfers, choose nonstop United flights when available. CTA: Filter search results for nonstop IAD–IAH flights to compare duration and pricing for May.
Airline Comparison for IAD to IAH — United, American & Delta in May
United typically offers the most nonstop flights between Washington Dulles International Airport (IAD) and George Bush Intercontinental Airport (IAH), making it the fastest option for May travel. American and Delta often provide one-stop itineraries via Dallas/Fort Worth, Charlotte, or Atlanta; these can be less expensive but add travel time. Baggage fees vary by fare class — basic economy usually excludes a free checked bag, while main cabin and higher fare classes include it. Loyalty benefits (upgrades, lounge access) are strongest if you fly with the airline where you hold elite status. CTA: Compare United, Delta, and American fares and baggage rules for May and book the best balance of price and convenience.
Seasonal Travel Tips for IAD to IAH in May — Weather, Packing & Airport Advice
Pack light breathable clothing and an umbrella for Houston's warm, humid May weather, and include a light layer for cooler mornings at Washington Dulles International Airport (IAD). Anticipate higher security and parking demand around Memorial Day — arrive 90–120 minutes before domestic departure during peak days. Consider enrolling in TSA PreCheck or CLEAR at Dulles to speed security. For connections through hubs, allow ample layover time in case of May thunderstorms. Use airline apps for real-time gate and weather alerts and prebook ground transportation from George Bush Intercontinental Airport (IAH) to avoid surge pricing. CTA: Prepare for May travel now by checking weather forecasts, enrolling in trusted traveler programs, and booking parking or shuttles in advance.
Flight Time & Schedules — Washington Dulles (IAD) to Houston Intercontinental (IAH) in May
Nonstop flight duration from Washington Dulles International Airport (IAD) to George Bush Intercontinental Airport (IAH) typically ranges from 3 hours 15 minutes to 3 hours 40 minutes. In May, expect 1–4 nonstop flights daily (commonly operated by United) with additional one-stop options by Delta (via ATL), American (via DFW or CLT), and others. Peak schedule demand occurs around Memorial Day weekend; weekdays mid-May often have slightly lower fares and more flexible schedules. For real-time departures and arrivals, check airline apps and flight trackers on the day of travel. CTA: View live IAD–IAH schedules for May and filter for nonstop flights to find the fastest options.
How to Find Cheap Flights from Washington Dulles (IAD) to Houston (IAH) in May
To secure cheap flights from Washington Dulles International Airport (IAD) to George Bush Intercontinental Airport (IAH) in May, book 3–8 weeks ahead for standard travel and earlier for Memorial Day weekend. Use fare alerts and price-tracking tools, set flexible-date searches, and compare alternate nearby airports such as Ronald Reagan Washington National (DCA) and Baltimore/Washington (BWI). Consider midweek departures, early-morning flights, or red-eye options to reduce fares. Loyalty programs and airline newsletters sometimes release short flash sales for United and partner carriers — enroll and monitor for IAD–IAH fare drops. CTA: Set a fare alert now and compare nonstop vs connecting itineraries to find the best May deal.