Seattle to Idaho Falls flights
Routavio compares airline fares from several flight booking sites. The lowest one-way fare it found for Seattle to Idaho Falls is €135 with Frontier Airlines (checked on 6 Nov 2026).
Your next trip, last seen at €135
Lowest observedFrontier Airlines · 1 stop · One wayWhen to fly
Explore datesMore dates worth a look
Last seen for 1 traveller on 6 Nov 2026. Check today's price.
Find the dates that work for you
The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.
One-way fare
- 1 Jan€184
- 2 Jan€166
- 3 Jan€184
- 6 Jan€164
- 7 Jan€182
- 8 Jan€182
- 9 Jan€164
- 10 Jan€135
- 11 Jan€182
- 12 Jan€164
- 13 Jan€164
- 14 Jan€159
- 15 Jan€159
- 16 Jan€164
- 17 Jan€182
- 18 Jan€182
- 19 Jan€164
- 20 Jan€163
- 21 Jan€182
- 22 Jan€182
- 23 Jan€163
- 24 Jan€152
- 25 Jan€163
- 26 Jan€164
- 27 Jan€164
- 28 Jan€140
- 30 Jan€164
- 31 Jan€140
- Lowest observed
- €135, departing 10 Jan 2027 (Last checked: 6 Nov 2026)One-way fare · Priced departure days checked in the last 14 days: 96Check live prices for this route
- Non-stop, one way
- €164, departing 19 Jan 2027 (Last checked: 6 Nov 2026)
- Airlines seen
- Alaska Airlines, Allegiant Air, Frontier Airlines
- Fastest observed flight time
- 1h 41m
- Non-stop
- Yes
About this route
Explore the fares we observed from Seattle to Idaho Falls. Prices move often, so pick your dates to see the latest options.
- Route distance
- 922 km
- Fastest observed flight time
- 1h 41m
- Airlines seen
- Alaska Airlines, Allegiant Air, Frontier Airlines
- Alternative airports
- BFI
Route-level information; individual journeys vary.
A clearer picture of your fare
If the observed fare for this date drops, we will email you. At most one message a day.
Non-stop airlines seen on this route
| Airline | Non-stop days / priced days |
|---|---|
| Alaska Airlines | 61 / 87 |
Departure days with a non-stop fare checked in the last 14 days. A carrier listed here had a non-stop fare on at least 3 days; schedules may differ.
Airport to city: straight-line distance
- King County International Airport - Boeing Field (BFI) → Seattle, city gazetteer reference point (47.6062, -122.3321): ≈ 9 km.
- Seattle–Tacoma International Airport (SEA) → Seattle, city gazetteer reference point (47.6062, -122.3321): ≈ 18 km.
- Idaho Falls Regional Airport (IDA) → Idaho Falls, city gazetteer reference point (43.4927, -112.0408): ≈ 3 km.
Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.
Lowest fare by departure month
Cheapest month from Seattle to Idaho Falls: January 2027, from €135 (checked 6 Nov 2026).
| Month | Lowest fare | Priced days |
|---|---|---|
| December 2026 | €145 | 27 |
| January 2027 | €135 | 28 |
| February 2027 | €152 | 26 |
| March 2027 | €146 | 12 |
Lowest fare by day of the week
Cheapest day of the week from Seattle to Idaho Falls: Sunday, from €135 (checked 6 Nov 2026).
| Day | Lowest fare | Priced days |
|---|---|---|
| Monday | €163 | 13 |
| Tuesday | €164 | 14 |
| Wednesday | €146 | 13 |
| Thursday | €140 | 16 |
| Friday | €159 | 12 |
| Saturday | €146 | 13 |
| Sunday | €135 | 15 |
One-way fares checked in the last 14 days. Each figure is the lowest priced departure day we saw, not a guaranteed fare.
Lowest fare by days before departure
Lowest fare from Seattle to Idaho Falls by days until departure (61 days or more): €135 (checked 6 Nov 2026).
| Days before departure | Lowest fare | Priced days |
|---|---|---|
| 8 to 30 days | €145 | 6 |
| 31 to 60 days | €164 | 27 |
| 61 days or more | €135 | 62 |
One-way fares checked in the last 14 days. Each figure is the lowest stored fare for that distance to departure, not a price forecast.
Fares for different departure dates, checked now; not a guide to when to book.
Lowest one-way fare we saw per airline
Cheapest airline from Seattle to Idaho Falls: Frontier Airlines, from €135 (checked 6 Nov 2026).
| Airline | Lowest fare | Priced days |
|---|---|---|
| Frontier Airlines | €135Jan 10, 2027 | 12 |
| Alaska Airlines | €146Dec 9, 2026 | 83 |
One-way fares checked in the last 14 days. An airline listed here had a fare on at least 3 departure days. Each figure is the lowest we saw, not a guaranteed fare. Connecting itineraries are included; the date is the departure day of that fare.
Frequently asked
How much is a flight from Seattle to Idaho Falls?
The lowest fare Routavio has observed is €135, found on 6 Nov 2026. Prices move, so read it as a floor rather than a quote.
When is the cheapest month to fly from Seattle to Idaho Falls?
Cheapest month from Seattle to Idaho Falls: January 2027, from €135 (checked 6 Nov 2026).
Are there direct flights from Seattle to Idaho Falls?
Yes. Published schedules report non-stop flights on this route with Alaska Airlines.
Which airlines fly from Seattle to Idaho Falls?
Routavio has seen these carriers on the route: Alaska Airlines, Allegiant Air, Frontier Airlines.
How long does the flight from Seattle to Idaho Falls take?
Across the 131 fares Routavio observed, the average journey time is 4h 52m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.
How many of the observed Seattle to Idaho Falls fares were non-stop?
93 of the 132 fares we observed were non-stop; the rest included at least one stop. That describes our observations, not every flight that operates.
How much is a non-stop flight from Seattle to Idaho Falls?
Cheapest non-stop one-way fare: €164, departing 19 Jan 2027 (checked 6 Nov 2026).
Which airlines had non-stop offers on at least 3 departure dates from Seattle to Idaho Falls?
For Seattle to Idaho Falls, examples of observed one-way non-stop offers checked within the last 14 days: Alaska Airlines (61). Each number counts distinct departure dates, not weekly flights; check current availability in search.
Which day of the week is cheapest from Seattle to Idaho Falls?
Cheapest day of the week from Seattle to Idaho Falls: Sunday, from €135 (checked 6 Nov 2026).
Which airline has the lowest fare from Seattle to Idaho Falls?
Cheapest airline from Seattle to Idaho Falls: Frontier Airlines, from €135 (checked 6 Nov 2026).
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide · Price and schedule freshness on Routavio
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Recently observed fares. Prices may change.