Houston (IAH) – Seattle (SEA)
- Distance
- 3,016 km
- 1,874 mi · 1,628 nm
- Flight time
- 4 h 46 min / 4 h 15 min
- Average gate to gate: IAH → SEA / back
- Time difference
- 2 h
- CO2 per passenger
- 379 kg
- One way, economy, incl. RF (224 kg CO2 only)
- Passengers / year
- 613,240
- Aug 2025 – Jul 2026 · +0.0%
- Flights / week
- 80
- Both directions, average
- Seats filled
- 87%
- 706,766 seats a year
- Airlines nonstop
- 2
- UA, AS
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
The way there
- Heading from IAH
- 318°
- Heading from SEA
- 120°
- Halfway point
- 39.50, -107.14
- Great-circle km
- 3,013 km (sphere, for EU261)
- In the air IAH → SEA
- 4 h 13 min
- In the air SEA → IAH
- 3 h 44 min
- Clocks
- Seattle is 2 h behind Houston
The estimate for a route without real times is 4 h 20 min; how it is worked out is on Sources.
Show as a table
| Month | Passengers |
|---|---|
| Aug 2025 | 67,781 |
| Sep 2025 | 54,945 |
| Oct 2025 | 49,301 |
| Nov 2025 | 42,268 |
| Dec 2025 | 48,114 |
| Jan 2026 | 38,327 |
| Feb 2026 | 32,992 |
| Mar 2026 | 43,492 |
| Apr 2026 | 45,302 |
| May 2026 | 53,566 |
| Jun 2026 | 65,087 |
| Jul 2026 | 72,065 |
Show as a table
| Month | Flights |
|---|---|
| Aug 2025 | 449 |
| Sep 2025 | 397 |
| Oct 2025 | 349 |
| Nov 2025 | 296 |
| Dec 2025 | 335 |
| Jan 2026 | 266 |
| Feb 2026 | 224 |
| Mar 2026 | 284 |
| Apr 2026 | 300 |
| May 2026 | 365 |
| Jun 2026 | 433 |
| Jul 2026 | 460 |
Airlines flying IAH–SEA nonstop
| Airline | Flights / week | Share of passengers |
|---|---|---|
| UAUnited Air Lines | 47 | 58% |
| ASAlaska Airlines | 33 | 42% |
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 B737 Max 900 · 1,275 flights
- Boeing 737-900ER · 1,050 flights
- Boeing 737-800 · 673 flights
- Airbus Industrie A320-100/200 · 418 flights
- Boeing 737-900 · 309 flights
- Boeing B737 Max 800 · 216 flights
- Airbus Industrie A319 · 205 flights
- Boeing 737-700/700LR/Max 7 · 11 flights
Also carried: 611 tonnes of freight and 180 tonnes of mail a year (passenger and cargo flights).
Punctuality
- On time
- 80.7%
- Arrived within 15 min of schedule
- Average delay
- 12 min
- Late arrivals count, early ones as 0
- Cancelled
- 0.4%
- Flights counted
- 4,180
- Aug 2025 – Jul 2026
| Airline | On time | Average delay |
|---|---|---|
| UAUnited Air Lines | 82.3% | 12 min |
| ASAlaska Airlines | 78.3% | 12 min |
Delay minutes by cause: airline 38% · aircraft arriving late 34% · air traffic system 24% · 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
- $302
- One way, all cabins
- Average over a year
- $295
- Q2 2025 – Q1 2026
- Largest airline
- Alaska Airlines
- 49% of passengers · $280
- Lowest-fare airline
- Alaska Airlines
- 49% of passengers · $280
History, not a price to book: what the average passenger paid per one-way trip in each quarter (Q2 2025 $299 · Q3 2025 $286 · Q4 2025 $297 · Q1 2026 $302).
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: 3,013 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 Houston and Seattle
Kilometres. Linked numbers have a page of their own. All Houston airports · All Seattle airports
More routes from IAH
| Route | Distance | Passengers / year |
|---|---|---|
| IAH → ORD | 1,489 km | 1,711,056 |
| IAH → DEN | 1,387 km | 1,641,444 |
| IAH → LAX | 2,219 km | 1,544,652 |
| IAH → ATL | 1,109 km | 1,430,755 |
| IAH → DFW | 361 km | 1,257,452 |
| IAH → SFO | 2,632 km | 1,223,236 |
| IAH → MCO | 1,375 km | 1,147,728 |
| IAH → EWR | 2,252 km | 1,135,261 |
| IAH → LGA | 2,279 km | 1,049,227 |
| IAH → LAS | 1,966 km | 1,028,809 |
More routes from SEA
| Route | Distance | Passengers / year |
|---|---|---|
| SEA → DEN | 1,648 km | 1,819,437 |
| SEA → PHX | 1,781 km | 1,813,338 |
| SEA → LAX | 1,535 km | 1,810,795 |
| SEA → ANC | 2,331 km | 1,694,688 |
| SEA → SFO | 1,092 km | 1,628,228 |
| SEA → ORD | 2,769 km | 1,622,991 |
| SEA → LAS | 1,394 km | 1,596,435 |
| SEA → DFW | 2,671 km | 1,577,921 |
| SEA → SAN | 1,690 km | 1,233,726 |
| SEA → SLC | 1,108 km | 1,106,553 |