Best Flights starting from $159
Economy
Washington, D.C. (IAD)
Wed, May 6
Roundtrip
Seattle (SEA)
Fri, May 15
Economy
Washington, D.C. (IAD)
Thu, May 7
Roundtrip
Seattle (SEA)
Sat, May 16
Economy
Washington, D.C. (IAD)
Sat, May 9
Roundtrip
Seattle (SEA)
Mon, May 18
Economy
Washington, D.C. (IAD)
Mon, May 11
Roundtrip
Seattle (SEA)
Wed, May 20
Economy
Washington, D.C. (IAD)
Sun, May 10
Roundtrip
Seattle (SEA)
Tue, May 19
Economy
Washington, D.C. (IAD)
Tue, May 5
Roundtrip
Seattle (SEA)
Thu, May 14
Economy
Washington, D.C. (IAD)
Fri, May 8
Roundtrip
Seattle (SEA)
Sun, May 17
Economy
Washington, D.C. (IAD)
Thu, May 28
Roundtrip
Seattle (SEA)
Sat, May 30
Economy
Washington, D.C. (IAD)
Sat, May 30
Roundtrip
Seattle (SEA)
Mon, Jun 1
Economy
Washington, D.C. (IAD)
Tue, May 26
Roundtrip
Seattle (SEA)
Thu, May 28
Economy
Washington, D.C. (IAD)
Wed, May 27
Roundtrip
Seattle (SEA)
Fri, May 29
Economy
Washington, D.C. (IAD)
Fri, May 29
Roundtrip
Seattle (SEA)
Sun, May 31
Economy
Washington, D.C. (IAD)
Sun, May 31
Roundtrip
Seattle (SEA)
Tue, Jun 2
Other Options for This Route
Other Destinations
Washington, D.C. (IAD) to Denver (DEN) in May from $163
From $163
Washington, D.C. (IAD) to San Juan (SJU) in May from $192
From $192
Washington, D.C. (IAD) to Los Angeles (LAX) in May from $200
From $200
Washington, D.C. (IAD) to San Jose (SJO) in May from $251
From $251
Washington, D.C. (IAD) to Montreal (YUL) in May from $332
From $332
Washington, D.C. (IAD) to Cody / Yellowstone (COD) in May from $335
From $335
Flights from Other Cities
Denver (DEN) to Seattle (SEA) in May from $156
From $156
Miami (Any) to Seattle (SEA) in May from $159
From $159
Minneapolis (MSP) to Seattle (SEA) in May from $176
From $176
San Jose (SJC) to Seattle (SEA) in May from $177
From $177
Washington, D.C. (BWI) to Seattle (SEA) in May from $197
From $197
St Louis (STL) to Seattle (SEA) in May from $203
From $203
✈️ Flight Guide: Washington, D.C. (IAD) → Seattle (SEA)
Complete travel information for your May journey
Departing from Washington, D.C. (IAD) FAQs
To find the cheapest economy flights from Seattle-Tacoma International Airport (SEA), search flexible dates across fare-comparison engines (Google Flights, Skyscanner, Kayak) and set price alerts. Book 3–8 weeks in advance for domestic routes and consider early-morning or red-eye departures for lower fares. Use location-based modifiers like "cheap flights from Seattle" and check low-cost carriers and seasonal fare sales to capture the best deals.
SEA is served by several budget-friendly carriers offering cheap economy seats, including Alaska Airlines, Southwest Airlines, Spirit (seasonal), and occasionally ultra-low-cost subsidiaries on select routes. For the best prices, compare these carriers on multi-search engines and check baggage and seat fees which can affect the total cost. Adding "Seattle cheap carriers" or "budget airlines SEA" as keywords helps when searching.
Yes — historically, January and February (post-holiday slump) and late September to early November (shoulder season) offer lower economy fares from SEA on many domestic routes. Summer and major holidays like December and July often see higher prices. For month-specific savings, search the fare calendar and sign up for alerts mentioning "SEA fare sale" or "Seattle low fares".
Seattle-Tacoma International Airport (SEA) serves the Puget Sound metro and is a gateway to Seattle, Tacoma, Bellevue, Everett, Vancouver (BC) and Portland (via short flights or transfers). These cities are commonly accessed as part of multi-destination itineraries and can offer additional cheap flight options when searching nearby airports or connecting itineraries.
For domestic economy flights out of Seattle-Tacoma International Airport (SEA), arrive at least 90 minutes to 2 hours before departure during busy travel periods. Allow extra time for checked bags, TSA screening, and shuttle transfers, and factor in possible traffic to Sea-Tac Airport. Use "Sea-Tac arrival times" and check the airport's live security wait times for optimized planning.
In December, economy fares from Seattle-Tacoma International Airport (SEA) typically spike around holiday dates. To save, travel earlier in December or right after New Year’s Day, use flexible-date searches, and consider nearby alternate airports like Portland or even Vancouver (BC) for comparison. Book refundable or changeable fares if your dates might shift due to winter weather.
Arriving at Seattle (SEA) FAQs
The most affordable economy routes from Seattle-Tacoma International Airport (SEA) to Harry Reid International Airport (LAS) typically include nonstop flights operated by Alaska Airlines and Southwest Airlines. Booking midweek, traveling in shoulder months like September or January, and searching flexible dates usually yields the lowest fares. Use keywords like "cheap SEA to LAS flights" and compare multiple aggregators for the best economy seat prices.
Harry Reid International Airport (LAS) serves Las Vegas and the surrounding Nevada metro area, including Henderson, North Las Vegas, and Boulder City. It's also the gateway to top destinations such as the Las Vegas Strip, Hoover Dam, Grand Canyon (South Rim), Los Angeles, San Diego, and Salt Lake City via short connecting flights or road trips. Using location-based searches like "Las Vegas airport to Grand Canyon" helps plan multi-destination travel.
Generally, the cheapest months to fly into Harry Reid International Airport (LAS) are January, February, and November, when leisure demand drops after holidays. Summer rates can vary with conventions and events; midweek travel often saves money. For targeted searches, use phrases like "cheap LAS flights January" and set fare alerts for the LAS route you want.
From Harry Reid International Airport (LAS), you can take shared shuttles, ride-hailing services (Uber/Lyft), taxis, or the RTC public bus to reach the Las Vegas Strip; journey times vary from 10 to 25 minutes depending on traffic. Some hotels offer complimentary shuttles; search "LAS to Las Vegas Strip transportation" for shuttle routes and pricing. Booking a prearranged transfer can sometimes be cheaper for groups.
Economy fares to Harry Reid International Airport (LAS) may include carry-on but often exclude checked bag allowance on ultra-low-cost carriers; legacy carriers may include at least one personal item and carry-on. Always review the airline's baggage policy and factor fees into the total fare when comparing prices. Use search intent phrases like "SEA to LAS baggage fees economy" to find current baggage charges before booking.
October can be a cost-effective time to visit Las Vegas and fly into Harry Reid International Airport (LAS), especially mid-month between convention peaks and weekend events. Look for economy fare promotions and weekday lodging discounts; use terms like "cheap October flights to LAS" when searching. Also check event calendars because concerts and conferences in October can inflate prices unexpectedly.
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Events & Festivals Impacting SEA to LAS Economy Airfares
Major conventions, headline residencies, and big-box events in Las Vegas can cause sudden increases in economy fares on the SEA–LAS route. Examples include CES (January), large tech or medical conferences, and major music residencies at Vegas venues. Travelers should check the Las Vegas Convention & Visitors Authority calendar and artist residency schedules when planning to avoid inflated prices. If traveling during events, book early or consider alternate dates and airports. Use queries such as "LAS conventions calendar" or "cheap flights SEA to LAS during CES" to research potential fare impacts.
Best Time to Fly Economy from SEA to LAS
The best time to fly economy from Seattle-Tacoma International Airport (SEA) to Harry Reid International Airport (LAS) for the lowest fares is typically January, February, and September. Midweek departures (Tuesdays and Wednesdays) and off-peak hours (early morning or late-night) usually yield cheaper fares. Avoid major Vegas conventions, holiday weekends, and the Fourth of July period if price is a priority. Use search phrases like "cheapest month to fly SEA LAS" and set alerts to track pricing trends.
Direct vs Connecting Flights: SEA to LAS Economy Comparison
Nonstop economy flights from Seattle-Tacoma International Airport (SEA) to Harry Reid International Airport (LAS) are typically faster and more convenient, with durations around 2 hours 45 minutes to 3 hours. Connecting flights can sometimes be cheaper, especially with budget carriers or during sales, but add layover risk and total travel time. For short routes like SEA–LAS, the convenience of nonstops often outweighs modest savings from connections; however, price-sensitive travelers should compare both options. Use search phrases like "SEA to LAS nonstop cheapest" and evaluate total journey time and baggage transfer policies when comparing.
Airline Comparison for SEA to LAS Economy Flights
Key carriers on the SEA–LAS route include Alaska Airlines and Southwest Airlines as the primary nonstop providers; they often compete on price and schedule frequency. Alaska offers a strong premium-economy-like experience and connectivity via its hub with a useful mileage program, while Southwest is known for free checked bags (two bags) and no change fees, which can make their economy fares more valuable despite similar base prices. Occasionally other carriers or seasonal low-cost operators provide competitive one-stop options. Use comparison queries like "Alaska vs Southwest SEA LAS economy" and weigh baggage, change fees, seat pitch, and loyalty benefits when choosing.
Seasonal Travel Tips for Economy Flyers: SEA to LAS
Winter: Account for possible weather delays at Seattle-Tacoma International Airport (SEA) and allow extra connection time; early-December and post-New Year’s often have lower fares. Spring (Shoulder): March and April can offer great deals—avoid spring-break windows. Summer: Book early for July/August travel and expect higher economy fares during holidays and festival weekends. Fall: September and October are ideal for cheap fares and milder weather. Always compare fares including baggage and seat fees and use phrases like "cheap shoulder-season flights SEA LAS" to find best-value options.
Flight Time & Schedules: SEA to LAS Economy Flights
Nonstop economy flights between Seattle-Tacoma International Airport (SEA) and Harry Reid International Airport (LAS) typically take about 2 hours and 45 minutes to 3 hours depending on winds and routing. Major carriers operate multiple daily nonstops, with early-morning, mid-afternoon, and evening departures common. Rede ye departures can be cheaper and are useful for maximizing daytime hours at your destination. Use schedule-search queries like "SEA LAS nonstop schedule" and confirm exact times on airline or OTA timetables before booking.
Cheap Flights: Economy Deals from Seattle-Tacoma International Airport (SEA) to Harry Reid International Airport (LAS)
Finding cheap economy flights between Seattle-Tacoma International Airport (SEA) and Harry Reid International Airport (LAS) requires flexible dates, fare-alerts, and carrier comparison. Primary keywords like "cheap flights SEA to LAS" and variations such as "budget flights Seattle Las Vegas" and LSI terms like "airfare deals," "fare calendar," and "price alerts" should be used in searches. Check midweek and redeye options, compare legacy versus low-cost carriers, and factor baggage fees into the total price. CTA: Sign up for price alerts and search flexible-date calendars to capture the lowest economy fares from SEA to LAS.