Boise (BOI) – Seattle (SEA)
- Distance
- 642 km
- 399 mi · 347 nm
- Flight time
- 1 h 41 min / 1 h 25 min
- Average gate to gate: BOI → SEA / back
- Time difference
- 1 h
- CO2 per passenger
- 81 kg
- One way, economy, incl. RF (48 kg CO2 only)
- Passengers / year
- 738,808
- Aug 2025 – Jul 2026 · −1.8%
- Flights / week
- 204
- Both directions, average
- Seats filled
- 76%
- 969,205 seats a year
- Airlines nonstop
- 3
- OO, AS, QX
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 BOI
- 314°
- Heading from SEA
- 130°
- Halfway point
- 45.55, -119.16
- Great-circle km
- 641 km (sphere, for EU261)
- In the air BOI → SEA
- 1 h 10 min
- In the air SEA → BOI
- 1 h
- Clocks
- Seattle is 1 h behind Boise
The estimate for a route without real times is 1 h 35 min; how it is worked out is on Sources.
Show as a table
| Month | Passengers |
|---|---|
| Aug 2025 | 66,989 |
| Sep 2025 | 63,869 |
| Oct 2025 | 65,959 |
| Nov 2025 | 55,489 |
| Dec 2025 | 62,162 |
| Jan 2026 | 55,004 |
| Feb 2026 | 51,267 |
| Mar 2026 | 63,029 |
| Apr 2026 | 54,567 |
| May 2026 | 68,178 |
| Jun 2026 | 67,299 |
| Jul 2026 | 64,996 |
Show as a table
| Month | Flights |
|---|---|
| Aug 2025 | 1,009 |
| Sep 2025 | 962 |
| Oct 2025 | 916 |
| Nov 2025 | 808 |
| Dec 2025 | 884 |
| Jan 2026 | 818 |
| Feb 2026 | 743 |
| Mar 2026 | 904 |
| Apr 2026 | 894 |
| May 2026 | 919 |
| Jun 2026 | 881 |
| Jul 2026 | 895 |
Airlines flying BOI–SEA nonstop
| Airline | Flights / week | Share of passengers |
|---|---|---|
| OOSkyWest Airlines | 112 | 44% |
| ASAlaska Airlines | 36 | 29% |
| QXHorizon Air | 57 | 27% |
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
- Embraer ERJ-175 · 8,775 flights
- Boeing 737-800 · 670 flights
- Boeing 737-900ER · 541 flights
- Boeing B737 Max 900 · 474 flights
- Boeing B737 Max 800 · 159 flights
- Boeing 737-700/700LR/Max 7 · 8 flights
- Airbus Industrie A321-200n · 3 flights
- Boeing 737-900 · 2 flights
Also carried: 244 tonnes of freight and 0 tonnes of mail a year (passenger and cargo flights).
Punctuality
- On time
- 85.5%
- Arrived within 15 min of schedule
- Average delay
- 9 min
- Late arrivals count, early ones as 0
- Cancelled
- 0.3%
- Flights counted
- 7,642
- Aug 2025 – Jul 2026
| Airline | On time | Average delay |
|---|---|---|
| OOSkyWest Airlines | 86.7% | 8 min |
| ASAlaska Airlines | 81.8% | 9 min |
Delay minutes by cause: airline 52% · aircraft arriving late 15% · air traffic system 17% · weather 15% · 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
- $178
- One way, all cabins
- Average over a year
- $173
- Q3 2025 – Q1 2026
- Largest airline
- Alaska Airlines
- 72% of passengers · $177
- Lowest-fare airline
- Alaska Airlines
- 72% of passengers · $177
History, not a price to book: what the average passenger paid per one-way trip in each quarter (Q3 2025 $169 · Q4 2025 $174 · Q1 2026 $178).
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: 641 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 Boise and Seattle
Kilometres. Linked numbers have a page of their own. All Seattle airports
More routes from BOI
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 |