AirportMiles

Denver (DEN) – Seattle (SEA)

Flights on GoogleSkyscanner
Distance, flight time and the airlines that fly it, from open data.
Distance
1,648 km
1,024 mi · 890 nm
Flight time
2 h 58 min / 2 h 40 min
Average gate to gate: DEN → SEA / back
Time difference
1 h
CO2 per passenger
207 kg
One way, economy, incl. RF (122 kg CO2 only)
Passengers / year
1,819,437
Aug 2025 – Jul 2026 · −1.6%
Flights / week
242
Both directions, average
Seats filled
87%
2,091,178 seats a year
Airlines nonstop
6
UA, AS, WN

Traffic: U.S. DOT, Bureau of Transportation Statistics, T-100 Segment (all carriers, scheduled service), Aug 2025 – Jul 2026. Distance: WGS-84 ellipsoid. CO2: UK DESNZ 2026 factors. Sources

Great circle from DEN to SEADENSEA
Shortest path over the earth's surface (great circle). Real flights bend around weather, winds and airspace.

The way there

Heading from DEN
307°
Heading from SEA
114°
Halfway point
44.00, -112.93
Great-circle km
1,645 km (sphere, for EU261)
In the air DEN → SEA
2 h 27 min
In the air SEA → DEN
2 h 9 min
Clocks
Seattle is 1 h behind Denver

The estimate for a route without real times is 2 h 45 min; how it is worked out is on Sources.

Passengers per month, both directions (Aug 2025 – Jul 2026)Busiest: July 2026: 207,134 passengers
0100K200K300KAugSepOctNovDecJanFebMarAprMayJunJul207.1K
Show as a table
Month Passengers
Aug 2025201,931
Sep 2025171,834
Oct 2025159,436
Nov 2025125,010
Dec 2025131,752
Jan 2026112,800
Feb 2026106,335
Mar 2026123,455
Apr 2026130,575
May 2026158,982
Jun 2026190,193
Jul 2026207,134
Flights per month, both directions (Aug 2025 – Jul 2026)Busiest: July 2026: 1,352 flights
05001K1.5KAugSepOctNovDecJanFebMarAprMayJunJul1.4K
Show as a table
Month Flights
Aug 20251,273
Sep 20251,148
Oct 20251,104
Nov 2025911
Dec 2025929
Jan 2026863
Feb 2026806
Mar 2026891
Apr 2026939
May 20261,093
Jun 20261,256
Jul 20261,352

Airlines flying DEN–SEA nonstop

Airline Flights / week Share of passengers
UAUnited Air Lines73
31%
ASAlaska Airlines59
26%
WNSouthwest Airlines51
22%
DLDelta Air Lines33
10%
F9Frontier Airlines16
9%
OOSkyWest Airlines8.5
2%

Both directions, Aug 2025 – Jul 2026. Airlines with at least one flight a month. U.S. DOT, Bureau of Transportation Statistics, T-100 Segment (all carriers, scheduled service). Sources

Aircraft on this route

  • Boeing 737-800 · 2,479 flights
  • Boeing 737-900ER · 2,219 flights
  • Boeing B737 Max 800 · 1,885 flights
  • Boeing B737 Max 900 · 1,697 flights
  • Airbus Industrie A321-200n · 952 flights
  • A220-300 BD-500-1A11 · 902 flights
  • Airbus Industrie A320-100/200 · 540 flights
  • Embraer ERJ-175 · 444 flights

Also carried: 1,491 tonnes of freight and 291 tonnes of mail a year (passenger and cargo flights).

Punctuality

On time
76.6%
Arrived within 15 min of schedule
Average delay
14 min
Late arrivals count, early ones as 0
Cancelled
0.7%
Flights counted
12,642
Aug 2025 – Jul 2026
Airline On time Average delay
UAUnited Air Lines84.4%10 min
ASAlaska Airlines76.4%14 min
WNSouthwest Airlines64.6%19 min
DLDelta Air Lines76.2%18 min
F9Frontier Airlines78.4%14 min
OOSkyWest Airlines80.4%14 min

Delay minutes by cause: airline 34% · aircraft arriving late 40% · air traffic system 22% · weather 3% · security 0%.

Both directions, Aug 2025 – Jul 2026. BTS Reporting Carrier On-Time Performance (US domestic flights of the larger US airlines). Sources

What passengers paid

Average fare, Q1 2026
$193
One way, all cabins
Average over a year
$193
Q3 2025 – Q1 2026
Largest airline
Alaska Airlines
36% of passengers · $184
Lowest-fare airline
Southwest Airlines
15% of passengers · $169

History, not a price to book: what the average passenger paid per one-way trip in each quarter (Q3 2025 $195 · Q4 2025 $191 · Q1 2026 $193).

U.S. DOT Consumer Airfare Report, Table 1a (airline ticket sample, US domestic airport pairs). Sources

Delay compensation (EU261 / UK261)

Measured by great-circle distance: 1,645 km.

Neither EU261 nor UK261 covers this route: it neither starts nor ends in the EU, EEA, Switzerland or the UK. Other countries have their own rules (for example Canada's APPR or Brazil's ANAC rules).

Also owed for a cancellation with less than 14 days' notice or denied boarding. Not owed for extraordinary circumstances. On a connection, the distance to the final destination counts. From 23 October 2027 the EU's Regulation 2026/2202 applies; it keeps these amounts (what changes in 2027). Information, not legal advice.

Every airport pair between Denver and Seattle

SEABFI
DEN1,6481,651
BJC1,6141,618

Kilometres. Linked numbers have a page of their own. All Denver airports · All Seattle airports

More routes from DEN

Route Distance Passengers / year
DEN → PHX968 km 2,417,314
DEN → LAX1,387 km 2,043,500
DEN → LAS1,011 km 2,041,165
DEN → ORD1,430 km 1,974,190
DEN → SLC629 km 1,802,673
DEN → DFW1,032 km 1,745,260
DEN → SFO1,556 km 1,743,354
DEN → MSP1,094 km 1,715,510
DEN → ATL1,930 km 1,697,204
DEN → SAN1,372 km 1,660,071

More routes from SEA

Route Distance Passengers / year
SEA → PHX1,781 km 1,813,338
SEA → LAX1,535 km 1,810,795
SEA → ANC2,331 km 1,694,688
SEA → SFO1,092 km 1,628,228
SEA → ORD2,769 km 1,622,991
SEA → LAS1,394 km 1,596,435
SEA → DFW2,671 km 1,577,921
SEA → SAN1,690 km 1,233,726
SEA → SLC1,108 km 1,106,553
SEA → ATL3,511 km 1,090,727

Questions

Denver (DEN) and Seattle (SEA) are 1,648 km (1,024 miles, 890 nautical miles) apart, measured along the shortest path over the earth's surface.