PlainFlights

GEG vs BOI - Airport Comparison

Select two airports to compare on-time performance, delays, cancellations, and top routes using U.S. Department of Transportation Bureau of Transportation Statistics (BTS) data (2020–2025) across all 50 states. See our methodology for how metrics are computed.

Airport A
GEG

Spokane, WA

Spokane, Washington

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Airport B
BOI

Boise, ID

Boise, Idaho

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Key Performance Metrics

BTS on-time performance data, 2020–2025 cumulative.

Metric GEG BOI
On-Time Rate (higher is better) 84.4% 85.2%
Avg Delay (lower is better) 67.4 min 69.4 min
Delay Rate (lower is better) 15.6% 14.8%
Cancellation Rate (lower is better) 0.63% 0.55%
Total Flights 205,595 266,753
Delayed Flights 32,016 39,406
Cancelled Flights 1,303 1,457
Top Delay Cause Carrier Carrier

✓ / ▲ indicates the more favorable value. Data: BTS On-Time Performance, 2020–2025.

Delay Cause Breakdown

GEG - Spokane, WA

Carrier 40.0%
Late Aircraft 33.6%
NAS 17.3%
Weather 8.8%
Security 0.3%

BOI - Boise, ID

Carrier 41.3%
Late Aircraft 33.3%
NAS 19.1%
Weather 6.1%
Security 0.2%

Top Routes

Top routes from GEG

Route Flights On-Time
GEG → SEA
Seattle
31,745 86.5%
SEA → GEG
Spokane
31,686 83.3%
DEN → GEG
Spokane
10,861 76.8%
GEG → DEN
Denver
10,835 85%
SLC → GEG
Spokane
9,439 87.4%
GEG → SLC
Salt Lake City
9,437 89%

Top routes from BOI

Route Flights On-Time
SEA → BOI
Boise
25,171 86%
BOI → SEA
Seattle
24,617 86.9%
BOI → DEN
Denver
14,565 84%
DEN → BOI
Boise
14,552 77.6%
BOI → SLC
Salt Lake City
10,117 90.1%
SLC → BOI
Boise
10,115 88%

Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data (2020–2025) Bureau of Transportation Statistics (BTS), On-Time Performance Data (2020–2025) On-time rates exclude cancelled and diverted flights. PlainFlights is not affiliated with BTS or the DOT

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This tool queries live on-time, delay, and cancellation figures for the two selected airports from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.