Cheapest€59.73
- SkyWest SW366809:191h 18m10:37Boise BOISeattle SEA
Door to door 4h 28mCO2 165.1 kgChanges 0Fixed, no changes
Traveling from Boise to Seattle costs €59.73 at the cheapest and takes 4h 25m door to door at the fastest, across 1 mode and 3 operators. The route covers 671 km. Cheapest is by Flight, fastest is by Flight.
At a glance
- Distance
- 671 km
- Fastest
- 4h 25m
- Average
- 4h 30m
- Services per day
- 20
- Cheapest
- €59.73
- CO2 per passenger
- 165.1 kg
Every way to make this journey
Journey times below are door to door, so they include getting to the terminal and away from it at the other end. Fares are the cheapest we currently sell on September 29, 2026.
| Mode | Door to door | Moving | At the ends | From | CO2 | Per day |
|---|---|---|---|---|---|---|
| Flight | 4h 26m | 1h 16m | 3h 10m | €69.17 | 165.1 kg | 20 |
- 4h 26mFastest, by Flight
- €69.17Cheapest, by Flight
- 165.1 kgLowest CO2, by Flight
- 671 kmDistance traveled
The cheapest and the fastest on September 29, 2026
Two journeys we can sell today, with the service number each operator files them under.
Fastest€81.56
- Alaska Airlines AA245817:181h 16m18:34Boise BOISeattle BFI
Door to door 4h 26mCO2 165.1 kgChanges 0Fixed, no changes
Lowest CO2€75.66
- SkyWest SW838207:301h 6m08:36Boise BOISpokane GEG
- wsdot Apple Line AL898009:495h 3m14:52Spokane bus stationSeattle King Street
Changes at Spokane, with 73 minutes between services and a walk of about 14 minutes.
Door to door 9h 19mCO2 126.5 kgChanges 1Fixed, no changes
Today's real departures
Live from the operators' own published timetables, through the open transit feeds they publish. Times and services are real. Fares are modeled until our booking connectors are live.
No live timetable for this trip yet.
Live from the operators' own published timetables, through the open transit feeds they publish. Times and services are real. Fares are modeled until our booking connectors are live.
Prices over the next three weeks
Live from our own engine, refreshed on every request. The cheapest days for each way of traveling are marked.
| Cheapest fare by mode and day for Boise to Seattle | SatSep 12 | SunSep 13 | MonSep 14 | TueSep 15 | WedSep 16 | ThuSep 17 | FriSep 18 | SatSep 19 | SunSep 20 | MonSep 21 | TueSep 22 | WedSep 23 | ThuSep 24 | FriSep 25 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Flight | €132.30 | €122.27 | €92.77 | €84.51 | €91.00 | €113.42 | €85.10 | €88.05 | €80.38 | €70.94 | €69.17 | €81.56 | €94.54 | €73.89 |
Cheapest day: 2026-09-29 · €59.73
Arriving in September changes what you want from a room in Seattle. It is not a thing we sell, so here is who does.
Looking for somewhere to stay in Seattle?
The search opens on Seattle with your nights already filled in, so it is one step to a real price.
Search Seattle on Booking.comOr compare on Expedia
Partner links. We do not sell accommodation. We earn a commission when a booking completes, and it never changes what you pay.
When to book Boise to Seattle
The same search run across the whole booking window, so the shape of the curve is visible rather than described.
- €76.2590 days
- €46.7560 days
- €50.8845 days
- €59.1430 days
- €66.8121 days
- €73.8914 days
- €85.107 days
- €92.773 days
- €132.301 days
- Cheapest lead time
- Fares bottom out around 60 days ahead, at €46.75.
- How much it moves
- The gap between the cheapest and most expensive lead time is 183 percent. The most expensive point is €132.30, 1 days out.
- What that means
- Today sits inside the cheap window, which closes about 60 days before departure. Waiting from here has usually cost money on this corridor rather than saved it.
Book now Fares on this route are lowest around 60 days ahead. You are inside that window.
Which departure day costs least
Median cheapest fare for each weekday, taken across the next three weeks of real prices.
- €80.38Sun
- €70.94Mon
- €69.17Tue
- €81.56Wed
- €94.54Thu
- €73.89Fri
- €88.05Sat
How the fare moves month by month
The same journey priced on the fifteenth of each of the next six months.
- €84.51Sep
- €65.63Oct
- €56.78Nov
- €57.37Dec
- €57.96Jan
- €49.11Feb
The route
What the journey actually looks like
Direct or connecting, how far the route really runs, and what happens when a connection is missed.
- Direct or connecting
- 90% of the services we sell on this corridor run through without a change. The remaining 10% involve one connection.
- How far it really runs
- The route covers 671 km against 651 km in a straight line, a detour of 3 percent. Track and road geometry account for the difference.
- Where the change is
- Connections are made at Spokane, Portland. The gap between arriving and leaving is 73 minutes, of which about 14 is walking.
- If the connection is missed
- The tightest connection we sell here has a 13 percent chance of not being made on the timetable alone. Part of this journey is a self transfer between separate tickets, so leave more time than the minimum and expect to check in again.
- First and last departure
- The first service of the day leaves Boise at 06:40 and the last at 20:13, across 20 departures. The return direction keeps its own timetable, so the times back are not these times reversed.
Where you leave from and where you arrive
The stations, airports and ports each mode on this corridor actually uses.
Boise
Rail
- Boise Union Pacific Depot
Bus
- Main Street Station
Air
- BOI
Seattle
Rail
- Seattle King Street
- Westlake
- Union Station
Bus
- Seattle King Street
- Seattle Greyhound Station
Air
- SEA
- BFI
Ferry
- Seattle
- Seattle Waterfront
Who runs this route
Speed, flexibility and what is on board. Nothing here is a rating, because we have not earned one.
| Operator | From | Fastest |
|---|---|---|
 Alaska Airlines | €60.32 | 4h 25m |
 Horizon Air | €62.68 | 4h 26m |
 SkyWest | €59.73 | 4h 25m |
What the fare is made of
Every part of the total, so the number at checkout is the number here.
| Part | Amount | Share |
|---|---|---|
| Operator fare | €43.00 | 72% |
| Taxes | €7.74 | 13% |
| Supplier fees | €7.00 | 12% |
| Our service fee | €1.99 | 3% |
| Total you pay | €59.73 | 100% |
A day in Seattle hauling a suitcase is a shorter day than it needs to be. We do not store bags.
Where to leave your bags in Seattle
Most of the points near Seattle King Street open before the first train and close after the last one.
Check Seattle on StasherOr try Bounce
Partner links. We do not run these networks. We earn a commission on a booking, and the price is the same as going direct.
Questions about Boise to Seattle
The questions people actually ask about this trip, answered from the same prices and times the page above is built on rather than written once and left to go stale.
How long does it take to get from Boise to Seattle?
The fastest journey from Boise to Seattle takes 4h 25m door to door, of which 1h 16m is spent moving, on the Flight. Most services take around 4h 30m, because that average includes slower stopping services and journeys with a connection. Times include reaching the terminal and leaving it at the far end.
How much does it cost to travel from Boise to Seattle?
The cheapest fare from Boise to Seattle is €59.73, checked on September 29, 2026. A typical fare across the next three weeks is €94.54. Both figures are the total for one passenger, including taxes, supplier fees and our service fee, so nothing is added at checkout.
What is the cheapest way to get from Boise to Seattle?
The cheapest way from Boise to Seattle is by Flight, at €69.17 for one passenger on September 29, 2026. That journey takes 4h 26m door to door. Cheaper is rarely faster on this corridor, and the comparison table on this page shows what each mode costs against what it saves.
When should I book Boise to Seattle?
Fares from Boise to Seattle bottom out around 60 days before departure, at €46.75. Across the whole booking window the gap between the cheapest and the most expensive lead time is 183 percent, measured on September 29, 2026. Booking inside the last week has consistently cost more on this corridor.
Which day of the week is cheapest for Boise to Seattle?
Tuesday is the cheapest day to depart from Boise to Seattle, at €69.17. That is the median of 21 priced departure days across the next three weeks, checked on September 29, 2026. Shifting a departure by one day is usually worth more than shifting the booking by one week.
Which month is cheapest for Boise to Seattle?
February is the cheapest of the next 6 months to travel from Boise to Seattle, at €49.11 for one passenger. Each month is priced on its fifteenth, so the comparison is like for like rather than a mix of weekends and midweek departures.
Who runs service from Boise to Seattle?
3 operators sell services from Boise to Seattle across 1 modes: Alaska Airlines, Horizon Air, SkyWest. Journey times, fares and fare conditions differ between them, and the operator table on this page compares all of them on speed, flexibility and what is provided on board.
Is there a direct service from Boise to Seattle?
90 percent of the services we sell from Boise to Seattle are direct. The rest connect at Spokane, Portland, with about 73 minutes between the two services. Both legs are sold on one booking, so a missed connection is rebooked at no charge.
Which station or terminal do services from Boise to Seattle use?
Services from Boise to Seattle by Flight leave from Boise BOI and arrive at Seattle BFI. Allow about 3h 10m in total for reaching the departure terminal and leaving the arrival one, which is already included in every door to door time on this page.
Can I change or refund a ticket from Boise to Seattle?
0 of the 3 operators we sell from Boise to Seattle allow a change or a refund. A change on a changeable fare costs €5.00. The operator table on this page names which is which, and the condition is shown again before you pay.
Where these numbers come from
Observed service A carrier record shows this named operator serving this named pair, and we carry that through unchanged.
Schedules, seat counts and fares are generated by our own model until the supplier contracts are signed. Places, coordinates, operators, which operator serves which pair, and every distance are real. We would rather say that on every page than let a modeled number pass for a filed one.
Defined in full at Door to door, Fares, The booking window, Carbon, Distances
- On this page
- Every figure above was computed for Boise to Seattle on September 11, 2026: 671 km of route against 651 km in a straight line, 20 services a day, 3 operators, a cheapest fare of €59.73, and 4h 25m door to door on the fastest mode. The return direction is computed separately and its numbers are not these numbers.
The trip is the easy half to plan. The days in Seattle are the half people leave until last.
Anything to book in Seattle before you go?
Day trips that leave Seattle in the morning and cover a good part of United States by evening.
See Seattle on GetYourGuideOr browse Viator
Partner links. We do not sell tours or tickets. We earn a commission on a booking, and it never changes the price.
Other ways to make this journey
Arriving in Seattle
Leaving Seattle
- 136Places you can leave for
- 19Countries
- 50Operators
Plan a trip from here
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