Downtown Denver skyline from City Park with the Rocky Mountains behind. Flights from Seattle to Denver

Route guide

Cheap Flights from Seattle to Denver

Compare partner fares from Seattle-Tacoma (SEA) to Denver International (DEN), with SEA screening options and how to reach downtown Denver from DEN.

SEA to DEN · 1,022 mi · 2h 48m est.

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

Photo: David Herrera, CC BY 2.0, via Wikimedia Commons

Seattle to Denver flight insights

Average flight time

~2h 48m (estimated)

SEA → DEN

Cheapest cached price

$125

Checking live fares…

Last checked Nov 6, 2026

Planning a trip from Seattle to Denver? The average flight time on this route is ~2h 48m (estimated). The lowest fare we recorded on this route recently was $125 (last checked Nov 6, 2026); today's live fare for your dates can differ.

Seattle to Denver covers a straight-line distance of about 1,022 miles. Based on that distance, a nonstop flight would take approximately ~2h 48m (estimated). Actual flight time varies by airline, aircraft and routing.

Seattle to Denver at a glance

SEA to DEN 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 Seattle to Denver on Eazair
Origin	Seattle (SEA)
Destination	Denver (DEN)
Average Flight Time	~2h 48m (estimated)
Current Lowest Fare	$125
Fares Last Checked	Nov 6, 2026
Distance	1,022 miles (SEA to DEN)
Time in Denver	1 hour ahead of Seattle
Airlines in our fare results	6

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

Flight deals from Seattle to Denver

This route runs from Seattle-Tacoma International (SEA) to Denver International (DEN). EazAir's fare checks for this trip have listed Delta, United, Frontier, Southwest and American. At DEN, Delta and Frontier arrive at Concourse A, United at A or B, and Southwest and American at Concourse C, though DEN's airline page shows no update date. At SEA, the airport's SEA Underground guide dated 2 Sep 2025 puts Delta and United at the S and A gates; for other airlines, check the boarding pass or app.

Sea-Tac's free Spot Saver lets you reserve a screening time at Checkpoint 4 between 4 a.m. and 10 p.m., up to five days before your flight and for groups of up to 10. TSA PreCheck is at Checkpoint 3 from 4 a.m. to 8 p.m., and CLEAR at Checkpoint 1, which SEA lists as open over the same hours. Riding the Link light rail 1 Line, get off at SeaTac/Airport station; Sound Transit says the pedestrian bridge from the station is open 24 hours.

Arriving at DEN, the train links Concourses A, B and C with Jeppesen Terminal, and DEN says the ride between the terminal and the C Gates takes less than 10 minutes. Mountain carriers load at Level 5, Island 4, hotel shuttles also pick up on Level 5, and a free rental car shuttle leaves from the Jeppesen Terminal pickup area. DEN suggests ordering a rideshare only after you collect your luggage, then meeting it at Level 5, Island 5.

EazAir made its first 13 fare checks for SEA to DEN from 4 Sep to 17 Oct 2026, each asking for the lowest one-way economy fare for one adult on a date 30 days ahead. The checks returned 12 different results, the highest at least double the lowest, and the lowest result came on 4 Sep. Frontier without a bundle includes a personal item only. Search your own dates, and check the final price, bags and fare rules on the partner site before you pay.

Airports for Seattle to Denver flights

Departure · Seattle

Seattle-Tacoma International (SEA)

Pacific Time

Arrival · Denver

Denver International (DEN)

Mountain Time

About Denver

Areas to know in Denver

LoDo (Lower Downtown)
RiNo Art District
Capitol Hill

Weather in Denver

A semi-arid climate with over 300 sunny days a year; the high altitude keeps evenings cool even in summer, and winter brings snow to the nearby mountains.

Seattle to Denver: 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 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.

Take the Link light rail 1 Line to SeaTac/Airport station. Sound Transit says the pedestrian bridge from the station is open 24 hours, and SEA runs a free Train-to-Plane shuttle from 5 a.m. to midnight.
SEA says app-based rideshares drop off at the terminal on the airport drives. If you are dropped on the baggage claim level, take the elevator or escalator up to ticketing.
SEA says Checkpoints 1, 2 and 3 are closest to the A and S gates, and lists Checkpoint 4 as open 24 hours. SEA says checkpoint hours may change.
SEA lists TSA PreCheck at Checkpoint 3 from 4 a.m. to 8 p.m. CLEAR is at Checkpoint 1, which SEA lists as open from 4 a.m. to 8 p.m.
SEA Spot Saver is a free security time reservation, offered at Checkpoint 4 from 4 a.m. to 10 p.m. SEA says you can book up to five days before your flight, for groups of up to 10.
SEA advises arriving two hours before a domestic departure and says over a third of daily passengers arrive before 9 a.m. SEA is working to restore live wait times on the flySEA app and website, so check the signs in the terminal.

Arriving at Denver International (DEN)

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

DEN's airline page shows no update date, so confirm your concourse on your boarding pass.

DEN has three concourses, A, B and C, beyond security. The train to the gates links them with Jeppesen Terminal.
The train leaves from a platform on Level 4. DEN says the ride from the terminal to the C Gates takes less than 10 minutes.
With an A gate boarding pass you can walk the A-Bridge, directly north of the security checkpoints, instead of taking the train.
In Jeppesen Terminal, even-numbered doors are on the west side and odd-numbered doors are on the east side.

Getting from DEN	Where to board	Where it goes
RTD A Line	Transit Center on Level 1, beneath the Westin Denver International Hotel. DEN says trains run every 15 minutes. RTD says trips to or from the airport need an Airport Fare.	Union Station in downtown Denver, 37 minutes according to DEN, with stops at 61st & Peña, 40th & Airport and 38th & Blake.
Rideshare	Level 5, Island 5, on the East or West side of the terminal. DEN says to order your ride after collecting your luggage.	Wherever you booked.
Taxis	Level 5, Island 1. DEN says taxis are available 24 hours a day and you can go straight to the stands after baggage claim.	Your destination.
Mountain carriers	Level 5, Island 4.	The carrier's own routes.
Hotel and rental car shuttles	Hotel shuttles pick up on Level 5. A free rental car shuttle runs from the Jeppesen Terminal pickup area.	Hotels and the off-site rental car counters.

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.
Frontier, without a bundle	Not included. One personal item only.	Not included. Prices vary by travel date and when you buy.	Costs extra, or a seat is assigned after check-in.	Not covered here. Check Frontier's rules before you book.

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 13 fare checks from Seattle to Denver ran from 4 Sep to 17 Oct 2026. For the return direction, Denver to Seattle, EazAir's first 15 checks ran from 11 Sep to 6 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 13 checks returned 12 different results. The lowest result came on 4 Sep. That is a small sample, so it shows that prices move, not when they are lowest. Search your own dates for current prices.

Sources

SEA: Security screening and checkpoints (no date shown, accessed 17 Oct 2026)
SEA: SEA Spot Saver (no date shown, accessed 17 Oct 2026)
SEA: Estimated checkpoint wait times (no date shown, accessed 17 Oct 2026)
SEA: All aboard the SEA Underground (September 2, 2025, 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)
Sound Transit: SeaTac/Airport Station (no date shown, accessed 17 Oct 2026)
DEN: Airlines (no date shown, accessed 17 Oct 2026)
DEN: Facilities (no date shown, accessed 17 Oct 2026)
DEN: To and from the airport (no date shown, accessed 17 Oct 2026)
DEN: East security checkpoint opens (4 Aug 2025, accessed 17 Oct 2026)
RTD: Airport (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)
Frontier: What is included in my fare (last modified 25 Mar 2026, accessed 17 Oct 2026)
Frontier: Bag options (no date shown, accessed 17 Oct 2026)
Frontier: Bundles (no date shown, accessed 17 Oct 2026)
EazAir fare checks for SEA to DEN, 4 Sep 2026 to 17 Oct 2026; DEN to SEA, 11 Sep 2026 to 6 Oct 2026

Frequently asked questions

Can I reserve a security time at Sea-Tac?

Yes. SEA Spot Saver is a free reservation at Checkpoint 4, offered from 4 a.m. to 10 p.m. SEA says you can book up to five days before your flight, for groups of up to 10.

Where is TSA PreCheck at SEA?

SEA lists TSA PreCheck at Checkpoint 3 from 4 a.m. to 8 p.m. CLEAR is at Checkpoint 1, which SEA lists as open over the same hours, and every checkpoint leads to all gates.

Which DEN concourse will I arrive at?

DEN lists Delta and Frontier at Concourse A, United at Concourses A and B, and Southwest and American at Concourse C. Confirm on your boarding pass.

Where do rideshares and taxis pick up at DEN?

Uber and Lyft pick up at Level 5, Island 5, on the East or West side. Taxis are at Level 5, Island 1, and DEN says they are available 24 hours a day.

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

Southwest allows a carry-on, Delta says every passenger can bring one free, and American Basic Economy includes one. Frontier without a bundle and United Basic Economy include only a personal item, with some MileagePlus exceptions for United.

How far apart are SEA and DEN?

SEA and DEN 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.