Best Flights starting from $231
from$231economy
Denver (DEN)
Tue, Sep 8
Roundtrip
Seattle (SEA)
Wed, Sep 9
from$267economy
Denver (DEN)
Wed, Sep 9
Roundtrip
Seattle (SEA)
Thu, Sep 10
from$267economy
Denver (DEN)
Mon, Sep 14
Roundtrip
Seattle (SEA)
Tue, Sep 15
from$306economy
Denver (DEN)
Thu, Sep 10
Roundtrip
Seattle (SEA)
Fri, Sep 11
from$306economy
Denver (DEN)
Fri, Sep 11
Roundtrip
Seattle (SEA)
Sat, Sep 12
from$306economy
Denver (DEN)
Sat, Sep 12
Roundtrip
Seattle (SEA)
Sun, Sep 13
from$336economy
Denver (DEN)
Sun, Sep 13
Roundtrip
Seattle (SEA)
Mon, Sep 14
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Other Options for This Route
Other Destinations
Denver (DEN) to Phoenix (Any) in September from $96
From $96
Denver (DEN) to Minneapolis (MSP) in September from $134
From $134
Denver (DEN) to Chicago (MDW) in September from $149
From $149
Denver (DEN) to Miami (MIA) in September from $162
From $162
Denver (DEN) to Omaha (OMA) in September from $164
From $164
Denver (DEN) to Little Rock (LIT) in September from $184
From $184
Flights from Other Cities
Los Angeles (LAX) to Seattle (SEA) in September from $154
From $154
San Diego (SAN) to Seattle (SEA) in September from $183
From $183
Washington, D.C. (BWI) to Seattle (SEA) in September from $219
From $219
Las Vegas (LAS) to Seattle (SEA) in September from $223
From $223
Sacramento (SMF) to Seattle (SEA) in September from $249
From $249
Juneau (JNU) to Seattle (SEA) in September from $255
From $255
✈️ Flight Guide: Denver (DEN) → Seattle (SEA)
Complete travel information for your September journey
Departing from Denver (DEN) FAQs
To find the cheapest economy flights from Seattle-Tacoma International Airport (SEA), search flexible dates across multiple meta-search engines (Google Flights, Skyscanner, Kayak) and sign up for fare alerts. Book 21–60 days in advance for domestic U.S. routes and 2–5 months for international economy fares, and compare low-cost carriers (Southwest, Spirit) with legacy carriers (Alaska, Delta) to spot real savings. Use flexible airport searches including nearby airports like Portland (PDX), Vancouver BC (YVR), and Everett to expand cheap route options.
Common cheap nonstop economy routes from Seattle-Tacoma International Airport (SEA) include Seattle to Las Vegas (LAS), Los Angeles (LAX), San Francisco (SFO), Portland (PDX), Phoenix (PHX), and Denver (DEN). These routes are competitive because multiple carriers fly them frequently—use fare comparison and set price alerts to catch flash sales and weekend deals. Consider flying midweek or on red-eye flights to maximize savings on these popular routes.
Yes—September is often a sweet spot for cheap economy fares from Seattle-Tacoma International Airport (SEA) because summer travel demand drops and schools resume. You can find lower fares to leisure destinations like Las Vegas (LAS), Phoenix (PHX), and Southern California (LAX/SFO) as well as reduced transcontinental prices. Book early in August or watch fare calendars in late August to score September deals.
To save on baggage and seat fees when departing SEA in economy, compare inclusions across carriers—basic economy often has stricter carry-on and seat selection rules. Join frequent flyer programs (Alaska Mileage Plan, Delta SkyMiles), use co-branded credit cards for free checked bags, and pack strategically within carry-on limits to avoid checked bag fees. Always review the airline's carry-on and checked baggage policy before purchase to avoid surprises at SEA check-in.
Cheap airport transfer options to and from Seattle-Tacoma International Airport (SEA) include the Link Light Rail (direct service to downtown Seattle), public buses, rideshares, and shared shuttle services. Parking deals and off-site lots near SEA can also reduce costs—book airport parking in advance for discounts. For convenience and savings, combine public transit with a single rideshare drop-off rather than relying solely on taxis.
When looking for budget-friendly economy flights, include nearby major cities and hubs such as Portland (PDX), Vancouver BC (YVR), Tacoma (regional options), Olympia, Everett, and Bellingham. These cities sometimes show lower fares or alternate routing that saves money—compare multi-airport searches to find the cheapest itinerary. Expanding your search area increases chances of finding sale fares or one-way bargains.
Arriving at Seattle (SEA) FAQs
The best cheap economy arrival destinations from Seattle-Tacoma International Airport (SEA) typically include Las Vegas (LAS), Portland (PDX), Los Angeles (LAX), San Francisco (SFO), Phoenix (PHX), and Denver (DEN). These routes are heavily served by multiple carriers, creating price competition and frequent sales. For international bargains in economy, monitor routes to Mexico City (MEX) and Vancouver BC (YVR) during off-peak months.
To secure cheap economy arrival options for September, check fare calendars in July and August and set price alerts for your preferred routes. Flexible-date searches and midweek travel from Seattle often yield the best September economy fares to destinations like Las Vegas (LAS) and Southern California. Consider departing from alternate nearby airports (Portland PDX or Vancouver YVR) if savings outweigh added travel time.
Budget carriers can be a great option for economy arrivals from Seattle, offering lower base fares for short- and medium-haul routes. However, review baggage, seat selection, and change fee policies carefully—additional add-ons can eliminate perceived savings. Combine budget-carrier fares with advance planning and minimal checked baggage to maximize value.
Commonly accessed nearby major cities include Portland (PDX), Vancouver BC (YVR), Tacoma, Bellevue, Everett, and Olympia. For longer economy itineraries, travelers often connect through hubs like Los Angeles (LAX), San Francisco (SFO), and Denver (DEN) to reach more distant arrival cities at a lower overall price. Expanding arrival options increases your chances of locating the cheapest economy route.
For December holiday travel, book economy arrival flights from Seattle-Tacoma International Airport (SEA) 60–90 days in advance to avoid steep price increases. Popular routes to major hubs and holiday destinations fill quickly, so secure your itinerary early and consider flexible return dates to reduce costs. Signing up for airline newsletters and setting fare alerts in September–October can also help you spot early discounts.
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Events and Festivals Impacting Flight Prices from SEA — Monthly Calendar
Seattle and destination festivals can significantly affect economy fares. January–March: Ski season and events like Seattle Restaurant Week may modestly raise demand. April–June: Seattle's Bumbershoot and university graduations affect local travel; expect higher fares during major festival weekends. July–August: Summer events (Seafair, Pride) drive up local and inbound fares. September–October: Film festivals and music events can create localized price spikes but also offer off-peak weekday discounts. November–December: Holiday markets and Thanksgiving/Christmas travel cause major fare surges—book early. CTA: Check event calendars and set flight alerts several months before your event date to lock in better economy fares.
Best Time to Fly from Seattle-Tacoma International Airport (SEA) — Cheapest Economy Windows
The best time to fly from Seattle-Tacoma International Airport (SEA) for cheap economy fares is during shoulder seasons (late January–March, September–October) and midweek (Tuesdays–Thursdays). Fly early morning or late-night red-eyes to capture lower prices and less competition. For domestic routes, book 3–7 weeks in advance; for international economy, 2–5 months is optimal. Use fare alerts and flexible-date searches to identify the cheapest departure and return windows.
Direct vs. Connecting Flights from Seattle-Tacoma International Airport (SEA) — Economy Trade-offs
Direct nonstop flights from Seattle-Tacoma International Airport (SEA) offer speed and lower risk of missed connections, but connecting flights can be substantially cheaper in economy due to competitive pricing through hub airports. Common cheap connecting hubs include Los Angeles (LAX), San Francisco (SFO), Denver (DEN), and Phoenix (PHX). If you prioritize price over travel time and can accept longer total travel, select connecting itineraries with at least a 60–90 minute connection buffer to reduce missed-connection risk. For international multi-leg itineraries, consider longer layovers to lower fare tiers and to allow for re-protection if delays occur.
Airline Comparison for Budget Economy Travel from SEA — Alaska, Delta, Southwest & More
Alaska Airlines: Strengths include dominant West Coast network from Seattle-Tacoma International Airport (SEA), strong loyalty program, and often competitive economy fares to West Coast cities. Delta Air Lines: Offers broad domestic and international connectivity from SEA with consistent schedule options and competitive sale fares. Southwest Airlines: Known for transparent pricing and free checked bags, making it attractive for economy travelers despite fewer transcontinental nonstop options. United/Other LCCs: United provides hub connectivity (SFO/ORD/DEN) for transcontinental travel; low-cost carriers (Spirit, JetBlue on select routes) may offer the lowest base fares but charge many ancillaries. For cheapest overall economy travel, compare total price including baggage and seat fees rather than base fare alone.
Seasonal Travel Tips for Economy Travelers Departing SEA
Winter (Dec–Feb): Pack layered clothing and plan for winter delays—book flexible tickets if traveling during holidays and aim for early-December to save on economy fares. Spring (Mar–May): Use shoulder-season deals and midweek travel to find low fares; pack a light rain jacket for Seattle weather. Summer (Jun–Aug): Book far in advance for the best economy fares, and prioritize nonstop flights to minimize disruption. Fall (Sep–Nov): September and October are ideal for cheap economy travel—use flexible-date searches and target midweek departures. General tips: carry essential items in your carry-on to avoid checked-bag fees, sign up for airline newsletters for flash sales, and compare total cost (fare + baggage) when choosing the cheapest option.
Flight Times and Schedules from Seattle-Tacoma International Airport (SEA)
Typical nonstop economy flight durations from Seattle-Tacoma International Airport (SEA): to Portland (PDX) ~40–50 minutes, to Las Vegas (LAS) ~2.5 hours, to Los Angeles (LAX) ~2.5–3 hours, to San Francisco (SFO) ~2.5 hours, to Phoenix (PHX) ~2.5–3 hours, and to Denver (DEN) ~3 hours. International short-haul flights like Vancouver BC (YVR) are under an hour, while Mexico City (MEX) is ~5–6 hours. Scheduling patterns: major carriers operate multiple daily flights on high-demand corridors (LAX, SFO, LAS), with early-morning and red-eye options frequently cheaper in economy. For cross-country and international travel, consider overnight connections for lower fares.
Cheap Flights From Seattle-Tacoma International Airport (SEA) — Economy Strategies
To score cheap economy flights from Seattle-Tacoma International Airport (SEA), use a combination of fare calendars, early-bird alerts, and multi-airport searches. Primary keywords: cheap flights from SEA, Seattle economy fares. Secondary keywords: SEA fare deals, budget flights Seattle. LSI terms: airfare comparison, flexible date calendar, low-cost carrier deals. Tips: set price alerts 6–12 weeks before domestic travel, check flash sale days (Tuesday–Thursday), compare legacy carriers vs. LCCs, and include Portland (PDX) or Vancouver (YVR) as potential departure/arrival points. CTA: Start a fare alert for your preferred route and check the fare calendar today to lock in the lowest economy price.