Seattle to Idaho Falls: buy now or wait?
Wait FareScore 12/100
$209 ≈ €187 Today's best fare
Cheaper than 12% of what we have seen
13 Nov Frontier Airlines With a stop
Usually $209
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What the history says
Prices recorded 8
Typical price €187
Lowest we saw €187
Based on 8 prices we recorded on this exact route, compared against every month we have on record.
Best booking window
0–13 days — is when this route has been cheapest to book: €187 typical, on 8 observations.
Cheapest months to fly to Idaho Falls
November €187 7 observations
Booking tips from our fare data
- How far in advance should you book a flight?
- Book 1.5–2 months before departure. Tracking the same flights at every lead time (107,477 flights on 21,208 routes, 2026-06-14 to 2026-11-09), that window had the smallest average premium over each flight's lowest fare: +16.4%, against +48.7% in the last 3 days.
- Are domestic flights cheaper than international flights?
- Yes. The median one-way fare on a domestic route was €120, against €159 for international flights within the same continent and €269 for intercontinental ones (78,836 routes, fares observed 2026-06-14 to 2026-11-09).
- What are the cheapest cities to fly to this winter?
- Milan (median €29), London (median €30), Palermo (median €31). That is the median one-way fare for departures from 2026-11-01, across 343 cities ranked from fares we observed, counting only cities reachable from at least 50 airports.
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