Route · GEG → BOI · 2020–2025 BTS data
Spokane to Boise
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), GEG to BOI (Spokane to Boise) ranks #3322 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 87.6%
- On-time
- +8.6 pts
- vs US avg
- 68 min
- Delay when late
- 2,947
- Flights
- #3322 of 4927
- Corpus placement
Cancelled
0.3%
Best Month
Oct 2022 95%
Worst Month
Dec 2022 62%
Distance
287 mi
Carriers
6
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 31 | 4 | 0 | 0 | OO |
| Oct 2025 | 31 | 3 | 0 | 0 | OO |
| Sep 2025 | 30 | 3 | 0 | 0 | OO |
| Aug 2025 | 31 | 2 | 0 | 0 | OO |
| Jul 2025 | 31 | 6 | 0 | 0 | OO |
| Jun 2025 | 30 | 3 | 0 | 0 | OO |
| May 2025 | 39 | 4 | 0 | 0 | OO |
| Dec 2024 | 50 | 10 | 0 | 0 | OO |
| Nov 2024 | 78 | 6 | 0 | 0 | OO |
| Sep 2024 | 105 | 15 | 1 | 0 | OO |
| Aug 2024 | 112 | 17 | 0 | 0 | OO |
| Jul 2024 | 111 | 12 | 0 | 0 | OO |
| Jun 2024 | 91 | 13 | 0 | 0 | OO |
| May 2024 | 92 | 9 | 0 | 0 | OO |
| Apr 2024 | 104 | 6 | 0 | 0 | OO |
| Mar 2024 | 49 | 2 | 0 | 0 | OO |
| Oct 2023 | 49 | 4 | 0 | 0 | OO |
| Sep 2023 | 74 | 4 | 0 | 0 | OO |
| Dec 2022 | 69 | 26 | 0 | 1 | OO,QX |
| Nov 2022 | 59 | 9 | 0 | 0 | OO,QX |
| Oct 2022 | 58 | 3 | 0 | 0 | OO,QX |
| Sep 2022 | 72 | 8 | 0 | 0 | QX |
| Aug 2022 | 87 | 7 | 0 | 0 | QX |
| Jul 2022 | 90 | 9 | 3 | 0 | QX |
GEG–BOI seasonal on-time pattern
Best: April (93.0%) · weakest: December (69.3%)
Strongest calendar month
April
93.0% on-time · ~68 flights/mo
Busiest calendar month
July
~74 flights/mo avg
Weakest calendar month
December
69.3% on-time · ~50 flights/mo
Cancellation Rate
0.3%
4 of 1,573 flights
Diversion Rate
0.1%
1 of 1,573 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
GEG - Spokane
Full on-time, delay-cause, and seasonal performance for Spokane, WA.
GEG on-time profileBOI - Boise
Full on-time, delay-cause, and seasonal performance for Boise, ID.
BOI on-time profileCompare the two airports
See GEG and BOI side by side on delays, cancellations, and reliability.
Compare GEG vs BOIOrigin-hub reliability standing
Among GEG's stronger departures
GEG → BOI posts a 87.6% on-time rate, landing in the ≥85% band with 12 of 18 BTS-tracked routes leaving Spokane. The same hub also shows 6 mid-band and 0 challenged departures · fleet-wide on-time rank #494 of 4927 (highest on-time = #1).
Similar routes
Other BTS-tracked routes with comparable performance or trip length to GEG–BOI.
Routes with a similar on-time rate
What the Data Says About GEG to BOI
Spokane to Boise (GEG to BOI) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 87.6% on-time rate across 2,947 flights, with delays that do happen averaging 67.8 minutes. The corridor runs roughly 287 miles and is served by 6 carriers. Over the most recent 24 months, 4 of 1,573 flights were cancelled (0.3%) and 1 diverted (0.1%).
The monthly split is wide on this route: Oct 2022 posted the strongest performance at 95% on-time, while Dec 2022 came in at just 62% - a 33-point swing worth factoring into travel timing.
On the multi-year calendar, GEG–BOI peaks in April at 93.0% on-time while July carries the heaviest traffic (~74 flights per month) ; the softest month is December at 69.3%, a 23.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does GEG to BOI rank among US routes by traffic? ▼
How often are flights delayed from GEG to BOI? ▼
What is the cancellation rate for GEG to BOI? ▼
How far is the flight from GEG to BOI? ▼
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Airports on this route
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Using GEG–BOI data
GEG–BOI runs 8.6 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare GEG and BOI airport profiles: delay causes and top routes differ even on the same corridor. GEG airport
- If your dates flex, April (93.0% on-time) beats December (69.3%) on this corridor. Seasonal chart
- 4 other routes post a similar 87.6% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.