Seattle to Denver (SEA–DEN) — Airlines, Schedules & Connections
Flight Schedule
98 flights
Verified 21m ago
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No flights match your filters.
No nonstop flights on this route. connecting options below.
✦ 1-Stop
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Seattle to Denver
6 carriers, 273 flights/week nonstop.
6 Airlines
273 Flights/wk
1,022 mi
2h 27m nonstop
+1h ahead
130 1-stop hubs
SEA–DEN is served by 6 airlines with nonstop service. United Airlines, Alaska Airlines and Southwest Airlines lead the route. The flight covers 1,022 miles in approximately 2h 27m. Beyond nonstop, 130 hubs offer 1-stop connections.
Carriers on this route
Airline Landscape
All carriers operating nonstop SEA–DEN service, compared side by side.
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| UA United Airlines Also: CM | 53 | 32Q, 738, 739, 7M8 | 2h42-2h51 | Star Alliance | CM | |
| AS Alaska Airlines Also: DE, FI, HA, JX, KE, QR | 36 | 738, 739, 73J, 7M9 | 2h43-3h01 | Oneworld | DE, FI, HA, JX, KE, QR | |
| WN Southwest Airlines | 24 | 7M8, 7S7, B38M | 2h27-2h45 | – | – | |
| DL Delta Air Lines Also: AF, KE, VS, WS | 21 | 223, BCS3, E75L | 2h42-2h59 | SkyTeam | AF, KE, VS, WS | |
| F9 Frontier Also: Y4 | 14 | 321 | 2h38-2h47 | – | Y4 | |
| SY Sun Country Airlines | 0 | – | – | – | – |
Aircraft on this route
OTP based on airport-level delay snapshots. Duration ranges reflect seasonal/directional variation.
Schedule
Weekly Schedule Pattern
Nonstop flight frequency by day of week, SEA to DEN direction.
Mon
40
flights
Tue
37
flights
Wed
40
flights
Thu
39
flights
Fri
39
flights
Sat
36
flights
Sun
42
flights
Departure time distribution
12 AM6 AM12 PM6 PM12 AM
Morning departures
Afternoon/evening departures
46
Nonstop flights
273
Outbound / wk
302
Return / wk
Connections
Connection Landscape
Beyond nonstop. 1-stop and 2-stop options for SEA to DEN.
1-STOP
One-Stop Connections
130
Hubs
~4h
Fastest
~46h
Longest
Verified with published schedule alignment and minimum connection time.
2-STOP
Two-Stop Connections
4,816
Candidates
Two-stop connections loaded in the connections tab above.
Connections computed from published schedules with minimum connection time verification. Use the interactive explorer above the fold to filter by airline, tier, and layover time.
Alternatives
Other ways to reach Denver from Seattle
Nearby airports with service to Denver International Airport.
| Metric | SEA→DEN | BFI→DEN | PAE→DEN |
|---|---|---|---|
| Distance from SEA | – | 5 mi | 32 mi |
| Nonstop airlines | 6 | 4 | 1 |
| Weekly flights | 273 | 1 | – |
| Flight time | 2h 27m | 2h 50m | 2h 15m |
| Departure OTP | 80% | – | – |
Airports within 200 miles of SEA with service to Denver International Airport.
Know before you go
Travel Essentials
Practical planning for this route.
Time Difference
+1h
Denver is 1 hour
ahead of
Seattle.
SEA: PDT · DEN: MDT
When it's 6:00 PM in Seattle, it's 7:00 PM in Denver.
SEA: PDT · DEN: MDT
When it's 6:00 PM in Seattle, it's 7:00 PM in Denver.
Distance & Flight Time
1,022 mi / 1,645 km
Nonstop flight time is approximately 2h 27m to 3h 1m.
Getting to SEA
Link Light Rail runs from downtown Seattle (Westlake station) to the airport in 38 minutes ($3.50 peak). Trains run every 6–12 minutes during peak hours from 5am to 1am. Ride-shares run $30–50 from downtown; SR-99 and I-5 can be heavily congested southbound during afternoon rush (3–7pm).
Sound Transit 574 express bus serves Tacoma ($2.50–4). Sounder commuter rail connects Tacoma to the airport area via a shuttle.
Getting from DEN
RTD A Line runs to Denver Union Station (37 min, $10.50) with connections to light rail and bus routes. Taxis have meters; expect $55–65 to downtown.DEN's tent-roof Jeppesen Terminal is a single building; all three concourses connect via the underground automated train. Rental cars are on level 5. For ski resorts, shuttle services depart from Ground Transportation.
Denver Climate
Semi-arid with 300+ days of sunshine. Summers are dry and warm (27–34°C) with afternoon thunderstorms that produce dramatic but brief delays. Winters bring cold temperatures (−8 to 5°C) and heavy blizzards that can shut down ground operations.
Spring snowstorms can be heavier than midwinter ones. Altitude (5,430 ft) means low humidity year-round; stay hydrated.
Facts
SEA–DEN Quick Facts
Key statistics for the Seattle to Denver route.
Route details
Distance1,022 mi / 1,645 km
Flight time2h 27m to 3h 1m
Time difference+1 hour
Airlines (nonstop)6
Weekly flights273 out / 302 return
1-stop connections130 hubs
Origin: SEA
Full nameSeattle–Tacoma International Airport
IATA / ICAOSEA / KSEA
TimezoneAmerica/Los_Angeles
Passengers/yr52.6M
Elevation433 ft / 132 m
Destination: DEN
Full nameDenver International Airport
IATA / ICAODEN / KDEN
TimezoneAmerica/Denver
Passengers/yr82.4M
Elevation5,431 ft / 1,655 m
FAQ
Frequently Asked Questions
Common questions about SEA to DEN flights.
Nonstop flights from Seattle–Tacoma International Airport to Denver International Airport take approximately 2h 27m to 3h 1m. The route covers 1,022 miles.
6 airlines operate nonstop service: Alaska Airlines, Delta Air Lines, Frontier, Sun Country Airlines, United Airlines and Southwest Airlines. Plus 11 codeshare partners.
There are approximately 273 nonstop flights per week from SEA to DEN. The return direction has about 302 weekly flights.
Yes, 1-stop connections are available through BFI, APA, SCF, SGU, HDN, SBD, EGE, PAE, ASE, YLW, AZA, AFW, GRK, MKC, RFD, CPS, SHV, MEM, SGR, ILN, HRL, JAC, GNV, MSN, MTY, YEG, TEB, OKC, FAI, GDL, KOA, SUN, YYC, PSC, RDD, RDM, SAT, GEG, MDW, MFR, IND, EUG, SLC, BOI, ONT, FCA, MSO, BIL, IAH, OAK, SFO, PDX, ABQ, OMA, BZN, SMF, SBP, IDA, MCI, LAX, ANC, LAS, RNO, YVR, FAT, SAN, MSP, BNA, TUS, OGG, AUS, MSY, PHX, SBA, CMH, PSP, BUR, LIH, DFW, CLE, MRY, GTF, STL, ORD, SJC, TUL, PIT, ICT, HLN, MKE, SNA, ATL, RDU, NRT, STS, HNL, JFK, MCO, DTW, DUB, BWI, MUC, DAL, HND, PHL, CLT, TPA, CHS, KEF, FRA, BOS, IAD, EWR, ELP, MIA, RSW, FCO, DCA, MEX, CVG, YYZ, ACV, LHR, FLL, SJD, CUN, PVR, LIR, BZE and IST. These options provide additional schedule flexibility.
Denver is 1 hour ahead of Seattle.
Yes, return flights from DEN to SEA are available. Use the direction toggle at the top to view the return schedule.
Click the 'Search Flights' button to check availability and prices on Google Flights. You can also compare airlines and schedules on this page to find the best option.
See the On-Time Performance section for the latest delay data at both airports. This shows departure and arrival reliability to help you plan.
Route data is updated regularly from official airline schedules. On-time performance data comes from recent airport delay snapshots.
Alaska Airlines operates 4 to 5 daily nonstops. United runs 3 to 4. Delta adds 2 to 3. Southwest has 2 to 3. Frontier offers 1 to 2. Total daily nonstops reach 12 to 17. Block time is about 2 hours 40 minutes eastbound and 3 hours westbound. Alaska and United hold the largest seat shares.
Seattle-Tacoma has a single terminal with four concourses connected after security. Alaska uses gates throughout the N and C concourses. Delta uses the S concourse south satellite. United and Southwest use the A or B gates. Denver has three concourses (A, B, C) connected by an underground train. United dominates Concourse B. Southwest uses Concourse C. The DEN train is the only way between concourses after security.
DEN sits at 5,430 feet. The altitude can cause longer takeoff rolls and slightly reduced climb rates on hot summer days. Airlines factor this into weight and fuel calculations. As a passenger, the main effect is that the approach into DEN can be bumpy during afternoon convective weather. Summer thunderstorms at DEN cause more delays than the altitude itself.
The A Line commuter rail runs from DEN to Denver Union Station in 37 minutes. It costs $10.50 one-way. Trains depart every 15 minutes during peak hours. Union Station connects to Denver's light rail and bus network. Rideshare pickup is at Level 5 of the Jeppesen Terminal, Island 4. The drive to downtown is about 30 to 45 minutes depending on I-70 traffic.
Seattle to Denver: Tech Corridor and Mountain Gateway
SEA-DEN connects the Pacific Northwest's largest metro to the central Rocky Mountain hub. Alaska, United, Delta, Southwest, and Frontier combine for 12 to 17 daily nonstops. Block time is 2 hours 40 minutes eastbound and about 3 hours westbound. The route serves tech industry traffic between Seattle's Amazon, Microsoft, and Boeing campuses and Denver's growing tech sector. It also carries heavy ski season traffic from Seattle to Colorado resorts accessible through DEN. Alaska and United hold the largest shares, reflecting their respective hub positions at SEA and DEN.
Hub Dynamics at Both Ends
Both airports function as major connecting hubs. Seattle is Alaska Airlines' primary hub, offering onward connections across the Pacific Northwest and to Asia. Denver is United's second-largest hub behind Houston, with connections to the Mountain West, Great Plains, and seasonal international routes. A direct SEA-DEN ticket also opens connecting possibilities on both ends: through SEA to Portland, Boise, or Alaska, and through DEN to Aspen, Jackson Hole, or Kansas City. Denver's A Line rail makes the airport-to-downtown connection straightforward at $10.50 and 37 minutes. Seattle's Link Light Rail reaches SEA-TAC from downtown in about 40 minutes for $3.25.