Seattle (SEA) to Salt Lake City (SLC)
Flight time
≈ 2h 11m
Bearing
128° SE
Seattle (SEA) to Salt Lake City (SLC) is 688 miles (1,107 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies SEA–SLC
Filed traffic dataIn May 2026, Delta Air Lines operated the most departures, one of 4 carriers flying nonstop SEA–SLC; the Boeing 737-900ER was the most common aircraft at 26% of departures; flights ran 84% full.
Departures
702
May 2026
Seats
111,428
both directions
Passengers
93,507
both directions
Load factor
83.9%
RPM ÷ ASM
Who flies SEA–SLC?
Delta Air Lines operated the most nonstop SEA–SLC departures in May 2026 (412), one of 4 carriers on the route.
- DL
412 departures · 73,622 seats
Share of departures58.7%83.6%
Load
- AS
163 departures · 28,160 seats
Share of departures23.2%84.7%
Load
- OO
103 departures · 7,822 seats
Share of departures14.7%83.0%
Load
- QX
24 departures · 1,824 seats
Share of departures3.4%90.2%
Load
What plane flies SEA–SLC?
In May 2026, the Boeing 737-900ER flew 26% of SEA–SLC departures — more than any other aircraft type.
- Boeing 737-900ER
179 departures · 83.0% load
25.5% - Boeing 737-800
170 departures · 86.9% load
24.2% - Embraer E175
127 departures · 84.3% load
18.1% - Airbus A321neo
110 departures · 82.3% load
15.7% - Airbus A321
58 departures · 81.0% load
8.3% - Boeing 737 MAX 9
52 departures · 85.5% load
7.4% - Boeing 737 MAX 8
4 departures · 82.3% load
0.6% - Airbus A220-300
1 departures · 97.7% load
0.1% - Airbus A220-100
1 departures · 49.5% load
0.1%
How has SEA–SLC traffic changed?
Nonstop SEA–SLC departures fell from 755 in June 2025 to 702 in May 2026.
Monthly nonstop SEA–SLC traffic, trailing 12 months through May 2026. Bars scale to the busiest month; months with no filed service show as zero.
June 2025
755 departures · 105,616 passengers
88.1%
Load
July 2025
788 departures · 109,553 passengers
87.0%
Load
August 2025
818 departures · 112,449 passengers
85.8%
Load
September 2025
797 departures · 100,081 passengers
79.5%
Load
October 2025
725 departures · 94,236 passengers
79.4%
Load
November 2025
592 departures · 73,170 passengers
76.8%
Load
December 2025
618 departures · 82,024 passengers
81.9%
Load
January 2026
610 departures · 78,715 passengers
77.3%
Load
February 2026
597 departures · 77,756 passengers
76.6%
Load
March 2026
664 departures · 88,528 passengers
79.5%
Load
April 2026
649 departures · 85,449 passengers
80.9%
Load
May 2026
702 departures · 93,507 passengers
83.9%
Load
By direction
Each direction is filed separately — they rarely match.
SLC → SEA
88.3% full
352 departures · 49,310 passengers
SEA → SLC
79.5% full
350 departures · 44,197 passengers
Nonstop SEA–SLC traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through May 2026; filings from 2025. Public domain (US Government work).
The airports
Frequently asked
How far is Seattle (SEA) from Salt Lake City (SLC)?
SEA to SLC is 688 miles (1,107 km / 598 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from SEA to SLC?
A nonstop covers the 688-mile great-circle distance in roughly 2h 11m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies SEA–SLC?
In May 2026, the Boeing 737-900ER flew the largest share of departures (25.5%), followed by the Boeing 737-800 (24.2%).
What mileage do I earn flying SEA–SLC?
Distance-based programs credit off the 688-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
Trip reports on YouTube
Fliers post trip reports from this route to YouTube. These three were matched automatically from public YouTube listings — The Frequent Flier does not host, review, or endorse them.
MedJet Aviation
Trip Report: Delta Airlines economy class from Seattle to Salt Lake City. SEA-SLC
16:45 · Apr 2022
The Trip Reporter
TRIP REPORT | Delta Air Lines (Main Cabin) | Seattle to Salt Lake City | Airbus A321
19:55 · Aug 2023
Coke Cans And Winglets
TRIP REPORT | Seattle (SEA) to Salt Lake City (SLC) | Alaska Airlines | E175 | First Class
12:48 · Jun 2020
Source: YouTube. Titles, thumbnails, and channel names come from YouTube. Playing a video loads the YouTube player, and using it means you agree to the YouTube Terms of Service; the Google Privacy Policy applies.
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