Seattle skyline with the Space Needle and Mount Rainier, seen from Queen Anne Hill. Flights from Denver to Seattle

Route guide

Cheap Flights from Denver to Seattle

Search partner fares from Denver International (DEN) to Seattle-Tacoma (SEA), and check the DEN concourse for your airline and the Sea-Tac pickup points.

DEN to SEA · 1,022 mi · 2h 48m est.

DEN to SEA
1,022 miles
2h 48m nonstop (estimated)
4 airlines in our fare results

Photo: Daniel Schwen, CC BY-SA 4.0, via Wikimedia Commons

Denver to Seattle flight insights

Average flight time

~2h 48m (estimated)

DEN → SEA

Cheapest cached price

$104

Checking live fares…

Prices shown may not be current. Last checked: Oct 20, 2026.

Planning a trip from Denver to Seattle? The average flight time on this route is ~2h 48m (estimated). The lowest fare we recorded on this route recently was $104 (last checked Oct 20, 2026); today's live fare for your dates can differ.

Denver to Seattle at a glance

DEN to SEA is about 1,022 miles in a straight line. The curved line is an illustration; the route your airline flies may differ.

Route Quick Facts

Quick facts for flights from Denver to Seattle on Eazair
Origin	Denver (DEN)
Destination	Seattle (SEA)
Average Flight Time	~2h 48m (estimated)
Current Lowest Fare	$104
Fares Last Checked	Oct 20, 2026
Distance	1,022 miles (DEN to SEA)
Time in Seattle	1 hour behind Denver
Airlines in our fare results	4

Local time in Seattle is 1 hour behind Denver. Denver is on Mountain Time, Seattle on Pacific Time.

Flight deals from Denver to Seattle

Departures on this page leave Denver International (DEN) for Seattle-Tacoma International (SEA). Paine Field (PAE) in Everett is a separate airport north of Seattle, so check that your ticket says SEA. In EazAir's fare checks, the airlines seen on this route are Delta, Southwest, United and American. At DEN, Southwest and American share Concourse C, Delta uses A and United uses A and B. At the Seattle end, the airport's train guide puts Delta and United at the S and A gates.

Getting to DEN by rail, the RTD A Line runs every 15 minutes from Union Station with stops at 38th & Blake, 40th & Airport and 61st & Peña, and DEN lists the trip at 37 minutes. In Jeppesen Terminal, even-numbered doors are on the west side and odd-numbered doors on the east side. DEN said in August 2025 that both checkpoints shut from 1 a.m. to 3 a.m. Southwest and American passengers then take the train to the C Gates, a ride DEN puts at less than 10 minutes.

Sea-Tac is a single terminal with six concourses, A, B and S at the south end and C, D and N at the north. Lyft and UberX pick up on the 3rd floor of the parking garage: cross a skybridge one level below ticketing and one above baggage claim, then go down one level. Taxis wait on that same floor at the north and south curbs. SEA says metered taxis carry three-digit numbers and one color, while flat-rate taxis, priced by zip code, have four-digit numbers and two colors.

EazAir's first 15 fare checks for DEN to SEA, from 11 Sep to 6 Oct 2026, each sought the lowest one-way economy fare for one adult, departing 30 days later. Across them the results took 13 different values, the highest at least double the lowest, and the lowest came on 5 Oct. That is a small sample, which shows prices move rather than when they bottom out. Search your own dates, and check the final price, bags and fare rules on the partner site before you pay.

Airports for Denver to Seattle flights

Departure · Denver

Denver International (DEN)

Mountain Time

Arrival · Seattle

Seattle-Tacoma International (SEA)

Pacific Time

About Seattle

Areas to know in Seattle

Capitol Hill
Ballard
Fremont

Weather in Seattle

Mild, wet winters and dry, mild summers. The Pacific Northwest's rainy reputation is strongest from October through April.

Denver to Seattle: airport and fare guide

Checked on 17 Oct 2026 against the airport, airline and transit pages listed under Sources. Airports and airlines change these details, so confirm them with your airline before you fly.

Paine Field (PAE) in Everett, north of Seattle, is a separate airport with its own passenger terminal. Check that your ticket says SEA if you plan to use Sea-Tac.

Leaving from Denver International (DEN)

Airline	DEN concourse
Delta	Concourse A
United	Concourses A and B
Southwest	Concourse C
American	Concourse C
Other airlines	Check your boarding pass or airline app.

Ride the RTD A Line from Union Station to Denver Airport Station. RTD says an Airport Fare applies.
RTD also lists airport bus routes, including AB1 and AB2 from Boulder, AT and ATA from Arapahoe County and 145X from Brighton. RTD says SkyRide bus trips to or from DEN need an Airport Fare.
DEN's East and West security checkpoints are both on Level 6 and give access to all airline gates.
DEN said on 7 Oct 2026 that West Security is open from 3:30 a.m. to 1 a.m. and East Security from 3 a.m. to 8 p.m. daily. Both take TSA PreCheck and CLEAR.
DEN recommends arriving at least two hours before your flight to allow time for security, and its security page points travelers to real-time wait times.
The final phase of the Great Hall Program includes renovating airline check-in on the south end of Level 6, and DEN says the whole program will be done by the end of 2027.

Arriving at Seattle-Tacoma International (SEA)

Airline	SEA gates
Delta	S and A gates
United	S and A gates
Other airlines	Check your boarding pass or airline app.

From SEA's SEA Underground guide dated 2 Sep 2025, which says Delta, United and almost all international airlines use the S and A gates. Gates can change, so check your boarding pass.

SEA has one terminal with six concourses: A, B and S at the south end, and C, D and N at the north end.
The N and S concourses are not connected to the other gates, so you reach them on the SEA Underground train. SEA says a train arrives every three minutes.
The Blue Line links the S, B and A concourses, the Green Line links N, C and D, and the Yellow Line shuttles between the A and D stations only.
SEA says every security checkpoint gives access to all gates.

Getting from SEA	Where to board	Where it goes
Link light rail 1 Line	From baggage claim, go up to the fourth floor, cross the skybridge to the parking garage and follow the signs to SeaTac/Airport station. A free Train-to-Plane shuttle runs from 5 a.m. to midnight. A fare applies on the train.	Downtown Seattle, with the line running from Federal Way to Lynnwood. SEA says the ride from downtown Seattle takes 38 minutes.
Rideshare (Lyft, UberX)	3rd floor of the parking garage. Cross a skybridge, one level below ticketing and one level above baggage claim, then go down one level.	Wherever you booked.
Uber Black and other premium rides	The baggage claim level door you choose in the app.	Wherever you booked.
Taxis	3rd floor of the parking garage, at the north and south curbs.	Metered taxis have three-digit numbers and one color. Flat-rate taxis charge by zip code and have four-digit numbers and two colors.

What the lowest fares include

Fare	Carry-on	Checked bag	Seat	Changes
Delta Main Basic	Delta says every passenger can bring one carry-on and one personal item free.	Delta charges for checked bags on domestic flights unless you qualify for a waiver, such as Medallion status or an eligible Delta SkyMiles American Express card.	Assigned after check-in. You may be able to buy a seat ahead of time for a fee.	Refunds are not allowed after the 24-hour risk-free cancellation window. Delta says a change or cancellation may be possible for a fee, with any value left as an eCredit.
American Basic Economy	Included, plus a personal item.	Not included, except for some AAdvantage status members and eligible cardmembers.	A free seat is assigned at check-in, or you can pay to choose one.	Generally not allowed. American describes a 24-hour window and some credit options on its Basic Economy page.
United Basic Economy	Not included on domestic flights. One personal item only, unless you are a MileagePlus Premier member, travel with one, or hold a qualifying MileagePlus card.	Not included; check United's bag fee calculator.	Assigned by United before boarding.	Changes may not be allowed. Refund if cancelled within 24 hours of booking, under United's 24-hour policy; after that, partial travel credit.
Southwest Basic	Southwest's policy allows one carry-on and one personal item.	Checked bag fees apply to Basic fares.	A free Standard seat is assigned at check-in. Preferred and Extra Legroom seats cost extra.	Only by upgrading to a Choice fare or higher. Cancelling at least 10 minutes before departure gives a flight credit, which for Basic expires 6 months from booking.

Based on the airlines' own pages, checked on 17 Oct 2026. Fees are left out because they change often. Check the final price, bags and fare rules on the partner site before you pay.

How EazAir measured fares on this route

EazAir's first 15 fare checks from Denver to Seattle ran from 11 Sep to 6 Oct 2026. For the return direction, Seattle to Denver, EazAir's first 13 checks ran from 4 Sep to 17 Oct 2026. Each check asked partner travel sites for the lowest one-way economy fare for one adult, departing 30 days after the check. Results can include connecting flights. The highest result was at least double the lowest. The 15 checks returned 13 different results. The lowest result came on 5 Oct. That is a small sample, so it shows that prices move, not when they are lowest. Search your own dates for current prices.

Sources

DEN: Airlines (no date shown, accessed 17 Oct 2026)
DEN: Security (no date shown, accessed 17 Oct 2026)
DEN: Great Hall Program (no date shown, accessed 17 Oct 2026)
DEN: East security checkpoint opens (4 Aug 2025, accessed 17 Oct 2026)
DEN: Passenger surge during Fall Break travel rush (7 Oct 2026, accessed 26 Oct 2026)
RTD: Airport (no date shown, accessed 17 Oct 2026)
SEA: Security screening and checkpoints (no date shown, accessed 17 Oct 2026)
SEA: All aboard the SEA Underground (September 2, 2025, accessed 17 Oct 2026)
SEA: Terminal overview (no date shown, accessed 17 Oct 2026)
SEA: Public transit, Link light rail (no date shown, accessed 17 Oct 2026)
SEA: App-based rideshare (no date shown, accessed 17 Oct 2026)
SEA: Metered and flat rate taxis (no date shown, accessed 17 Oct 2026)
Sound Transit: 1 Line, Lynnwood to Federal Way (no date shown, accessed 17 Oct 2026)
Delta: Delta Main Basic (no date shown, accessed 17 Oct 2026)
Delta: Fares and discounts (no date shown, accessed 17 Oct 2026)
Delta: Carry-on baggage (no date shown, accessed 17 Oct 2026)
Delta: Bags (no date shown, accessed 17 Oct 2026)
American Airlines: Basic Economy (no date shown, accessed 17 Oct 2026)
United: Basic Economy FAQ (no date shown, accessed 17 Oct 2026)
Southwest: Fare information (no date shown, accessed 17 Oct 2026)
Southwest: Assigned seating (no date shown, accessed 17 Oct 2026)
Southwest: Carry-on baggage policy (no date shown, accessed 17 Oct 2026)
Southwest: Fare types and benefits (no date shown, accessed 17 Oct 2026)
EazAir fare checks for DEN to SEA, 11 Sep 2026 to 6 Oct 2026; SEA to DEN, 4 Sep 2026 to 17 Oct 2026

Frequently asked questions

Which DEN concourse does Southwest use?

DEN lists Southwest and American at Concourse C, Delta at Concourse A and United at Concourses A and B. Check your boarding pass, since assignments can change.

How is Sea-Tac laid out?

SEA has one terminal with six concourses: A, B and S at the south end, and C, D and N at the north. The N and S concourses are reached only on the SEA Underground train.

Where do I find a taxi at SEA?

Taxis wait on the 3rd floor of the parking garage at the north and south curbs. Flat-rate taxis have four-digit numbers and two colors; metered taxis have three-digit numbers and one color.

Is Paine Field the same as Sea-Tac?

No. Paine Field (PAE) in Everett is a separate airport with its own passenger terminal. This page searches Seattle-Tacoma International (SEA).

Do the lowest fares on this route include a carry-on?

Southwest allows one carry-on and one personal item, Delta says every passenger gets both free, and American Basic Economy includes a carry-on. United Basic Economy is personal item only on domestic flights, with some MileagePlus exceptions.

How far apart are DEN and SEA?

DEN and SEA are about 1022 miles apart in a straight line. Flight times vary by airline, direction and routing, so check the scheduled time shown with each result.

Airline bag fees

Baggage allowances differ significantly between fare classes (Basic/Light vs. Standard/Flex) and can change over time. Always verify the exact allowance for your specific fare with the airline before you fly.

Checked bag fees from each airline's own website
Airline	Carry-on, basic economy	1st checked bag	2nd checked bag	Source
American Airlines	Included	$45	$55	aa.com, Sep 24, 2026
United Airlines	Not included	$40	$50	united.com, Sep 24, 2026
Delta Air Lines	Included	$45	$55	delta.com, Sep 24, 2026
Southwest Airlines	Included	$45	$55	southwest.com, Oct 27, 2026
JetBlue	Included	$45	$59	jetblue.com, Sep 24, 2026
Alaska Airlines	Included	$45	$55	alaskaair.com, Sep 24, 2026
Frontier Airlines	Not included	Varies	Varies	flyfrontier.com, Sep 24, 2026
Sun Country Airlines	Not included	Varies	Varies	suncountry.com, Sep 24, 2026

Domestic US fees per bag, each way, when paid online in advance. "Varies" means the airline prices bags by route and date.

Travel tips

Arrive early for domestic flights

TSA generally recommends arriving at least 2 hours before a domestic departure, more at larger hub airports during peak travel periods.

Pack a mixed carry-on

Keep a change of clothes, chargers, and any essentials in your carry-on rather than only your checked bag, in case of a delay or a bag that doesn't arrive with you.

Screenshot your confirmation

Save a screenshot or PDF of your booking confirmation and boarding pass before you travel, in case you lose signal or battery at the airport.

Check in online when it opens

Most airlines open online check-in 24 hours before departure. Checking in early can help with seat selection and, on some airlines, boarding group assignment.