Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

Connect in the morning. The same one-hour layover misses 2% of the time at 6 am and 17% of the time at 3 pm.

Nonstops


United	GEG	DEN	2h 30m	86%	0.5%	1,084	Flying now
Southwest	GEG	DEN	2h 15m	83%	0.1%	858	Flying now
Frontier	GEG	DEN	2h 35m	81%	0.0%	110	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Denver on time. Total trip = scheduled departure to arrival, layover included (Denver is 1 h ahead of Spokane). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	GEG 05:00 → SMF 06:50WN 367	3h 25m Sacramento	SMF 10:15 → DEN 13:35WN 3774	7h 35m	100%	96%
Alaska Details →	GEG 05:00 → PDX 06:10AS 710	1h 10m Portland	PDX 07:20 → DEN 11:03AS 401	5h 03m	98%	95%
Alaska Details →	GEG 05:07 → SEA 06:15AS 2065 · flown by Horizon	1h 49m Seattle	SEA 08:04 → DEN 11:56AS 375	5h 49m	100%	87%
Delta Details →	GEG 05:30 → SEA 06:40DL 2218	1h 50m Seattle	SEA 08:30 → DEN 12:18DL 1358	5h 48m	97%	81%
Southwest Details →	GEG 05:25 → PHX 08:00WN 1884	3h 00m Phoenix	PHX 11:00 → DEN 13:45WN 3262	7h 20m	100%	81%
Delta Details →	GEG 05:20 → SLC 08:00DL 1440	2h 15m Salt Lake City	SLC 10:15 → DEN 11:53DL 1553	5h 33m	96%	80%
Delta Details →	GEG 07:00 → MSP 11:48DL 1615	2h 39m Minneapolis	MSP 14:27 → DEN 15:38DL 1025	7h 38m	99%	78%
United Details →	GEG 12:37 → SFO 15:01UA 5217 · flown by SkyWest	2h 29m San Francisco	SFO 17:30 → DEN 21:28UA 1214	7h 51m	95%	77%
Tight connection: often missed
Alaska Details →	GEG 15:16 → PDX 16:32AS 3202 · flown by SkyWest	1h 32m Portland	PDX 18:04 → DEN 21:40AS 1627	5h 24m	55%	38%

Same layover, different day-part

How often the first flight arrives too late to connect (45 min minimum), for one-ticket layovers of 45–80 minutes.

Morning

PDX · 1h 10m · leaves 05:00 2%

Afternoon and evening

SLC · 1h 06m · leaves 17:10 11%

SFO · 1h 09m · leaves 12:37 17%

ORD · 1h 17m · leaves 11:09 18%

Delays build through the day, so an afternoon first leg eats the layover. A short connection is fine early in the morning and a gamble later on.

Mixing airlines

One ticketMiss it and the airline rebooks you; bags go through. 45 min is enough.

Separate ticketsMiss it and you buy a new ticket. Re-check bags, clear security again: we require 90 min.


Alaska AS 710 GEG 05:00 → PDX United UA 2375 PDX 08:50 → DEN Connection details →	2h 40m	6h 24m	99%	95%
Southwest WN 367 GEG 05:00 → SMF United UA 2285 SMF 08:50 → DEN Connection details →	2h 00m	6h 16m	97%	94%
Alaska AS 2065 GEG 05:07 → SEA United UA 1505 SEA 08:56 → DEN Connection details →	2h 41m	6h 38m	100%	91%

Rank all connections, any airlines →

Regional partners count as the airline that sells them: SkyWest flying Delta Connection is one Delta ticket.

How these are worked out. Makes the connection: share of the last year’s flights where the first flight arrived with at least 45 minutes to spare (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled and arriving within 15 minutes. Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON