How far is Flagstaff, AZ from Fort Casey, WA?
The driving distance from Flagstaff, AZ to Fort Casey, WA is about 1392.1 miles (2240.3 km), with a travel time of about 25h 48m by car.
- The straight-line flight distance is about 1058.9 miles (1704.1 km).
- For a round trip, plan for roughly 51h 36m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 AM MST.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 25h 48m.
Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
City in Minidoka County, Idaho, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Cloudy
Driving Route Map
The map below follows the saved road route between Flagstaff and Fort Casey.
Turn-by-Turn Driving Directions
Step-by-step road directions between Flagstaff and Fort Casey.
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1
Start on West Historic Route 66
1002 ft · 25 sec · West Historic Route 66
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2
Continue on East Route 66
3.5 mi · 7 min · East Route 66
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3
Continue on East Santa Fe Avenue
2182 ft · 49 sec · East Santa Fe Avenue
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4
Continue on Flagstaff-Valle Highway
698 ft · 12 sec · Flagstaff-Valle Highway
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5
Continue on Flagstaff-Cameron Highway
2.4 mi · 3 min · Flagstaff-Cameron Highway
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6
Continue on US Highway 89
6.4 mi · 9 min · US Highway 89
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7
Continue on Flagstaff-Cameron Highway
37.8 mi · 45 min · Flagstaff-Cameron Highway
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8
Enter the roundabout and take exit 1 toward Cameron–Bitter Springs Highway
47 m · 3 sec · Cameron-Bitter Springs Highway
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9
Exit the rotary onto Cameron-Bitter Springs Highway
1.4 mi · 2 min · Cameron-Bitter Springs Highway
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10
Continue on US 89
1419 ft · 27 sec · US 89
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11
Continue on Cameron-Bitter Springs Highway
56.6 mi · 1 hr 6 min · Cameron-Bitter Springs Highway
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12
Continue on US 89
14.8 mi · 19 min · US 89
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13
Continue on Bitter Springs-Utah State Line Highway
8 mi · 10 min · Bitter Springs-Utah State Line Highway
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14
Enter the roundabout and take exit 2 toward US 89 North
52 m · 3 sec
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15
Exit the roundabout onto US 89 North
1.6 mi · 3 min
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16
Continue on Highway South
725 ft · 14 sec · Highway South
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17
Continue on Bitter Springs-Utah State Line Highway
72.4 mi · 1 hr 27 min · Bitter Springs-Utah State Line Highway
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18
Turn right onto 100 East
1828 ft · 52 sec · 100 East
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19
Continue on Center Street
2103 ft · 1 min · Center Street
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20
Continue on 300 West
66.7 mi · 1 hr 25 min · 300 West
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21
Turn right onto North Main Street
1.4 km · 2 min · North Main Street
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22
Continue straight
9.2 mi · 11 min
-
23
Turn left
20.4 mi · 25 min
-
24
Take the exit right toward I 15 North
2452 ft · 26 sec
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25
Merge slight left onto Veterans Memorial Highway
229.1 mi · 3 hr 50 min · Veterans Memorial Highway
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26
Keep slight left to continue on Veterans Memorial Highway
55.3 mi · 56 min · Veterans Memorial Highway
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27
Keep slight left
95.4 mi · 1 hr 29 min
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28
Keep slight left to continue on I 86, US 30 West: Twin Falls
410.7 mi · 7 hr
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29
Take the exit slight right toward US 395 North: Stanfield, Hermiston
1706 ft · 42 sec
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30
Continue on Umatilla-Stanfield Highway
1.2 mi · 1 min · Umatilla-Stanfield Highway
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31
Continue on South Main Street
2 mi · 2 min · South Main Street
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32
Continue on Umatilla-Stanfield Highway
3.2 mi · 4 min · Umatilla-Stanfield Highway
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33
Turn right onto Southeast 4th Street
1.6 mi · 3 min · Southeast 4th Street
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34
Turn left onto East Theater Lane
1368 ft · 42 sec · East Theater Lane
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35
Turn right onto North 1st Street
2864 ft · 39 sec · North 1st Street
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36
Continue on Umatilla-Stanfield Highway
3.8 mi · 4 min · Umatilla-Stanfield Highway
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37
Turn left onto Columbia River Highway
1.1 km · 49 sec · Columbia River Highway
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38
Take the exit right toward I 82 West, US 395 North: Kennewick, Yakima
1130 ft · 28 sec
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39
Merge slight left onto McNary Highway
1.5 mi · 2 min · McNary Highway
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40
Take the exit slight right toward SR 14: Plymouth, Vancouver
1488 ft · 42 sec
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41
Turn left onto Lewis and Clark Trail Highway
13.6 mi · 16 min · Lewis and Clark Trail Highway
-
42
Turn right
26 mi · 31 min
-
43
Turn right onto State Highway 22
2961 ft · 53 sec · State Highway 22
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44
Turn right onto Wine Country Road
1669 ft · 34 sec · Wine Country Road
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45
Take the ramp right
1682 ft · 21 sec
-
46
Merge slight left
50.5 mi · 55 min
-
47
Continue straight
31 mi · 34 min
-
48
Keep slight left to continue on I 90 West
101.4 mi · 1 hr 54 min
-
49
Take the exit slight right toward I 405: Renton, Everett
1138 ft · 28 sec
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50
Keep slight right to continue on I 405 North: Everett, Bellevue
2439 ft · 59 sec
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51
Merge slight left
8.1 mi · 10 min
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52
Keep slight right
8.4 mi · 11 min
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53
Keep slight right
2.3 mi · 3 min
-
54
Continue straight
5.8 mi · 9 min
-
55
Take the exit straight
812 ft · 22 sec
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56
Continue on Paine Field Boulevard
1.2 km · 1 min · Paine Field Boulevard
-
57
Turn left onto 84th Street Southwest
2170 ft · 45 sec · 84th Street Southwest
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58
Turn right onto Mukilteo Speedway
1.9 mi · 5 min · Mukilteo Speedway
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59
Turn right
759 ft · 15 sec
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60
Turn slight left
1439 ft · 2 min
-
61
Continue on Mukilteo-Clinton Ferry
3 mi · 20 min · Mukilteo-Clinton Ferry
-
62
Continue on Ferry Dock
708 ft · 40 sec · Ferry Dock
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63
Continue on State Route 525
22 mi · 33 min · State Route 525
-
64
Turn left onto State Route 20
3.3 mi · 5 min · State Route 20
-
65
Continue on South Engle Road
2859 ft · 2 min · South Engle Road
-
66
Turn right
25 m · 6 sec
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67
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Flagstaff and Fort Casey.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
I 86
Keep slight left to continue on I 86, US 30 West: Twin Falls
411 mi · 07h 00m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
Better with a longer stop
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
Sunny leaving Flagstaff and Mostly Cloudy near Fort Casey.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Flagstaff to Fort Casey?
The road trip is about 1392.1 miles (2240.3 km) and usually takes 25h 48m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
What is the halfway point on this route?
Heyburn is a useful midpoint, sitting about 688.9 miles from Flagstaff and 703.1 miles from Fort Casey.
How much longer is the road route than the straight-line distance?
The direct path is about 1058.9 miles (1704.1 km), while the road route adds roughly 333.2 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 7:30 AM MST. Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $229.59 one way or $459.17 round trip. Estimated CO2 is about 436.5 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Flagstaff and Mostly Cloudy near Fort Casey.
Stop Ideas Near Heyburn
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Heyburn.
Twin Falls, Idaho
Flight Path Map
This map shows the direct air route between Flagstaff and Fort Casey. Straight-line distance: 1058.91 mi (1704.15 km).
#1 Flagstaff
The most populous city in Coconino County, Arizona.
| Population | 73,939 |
| Coordinates | 35.1980700, -111.6512700 |
| Altitude | 2104 |
| Country | United States |
#2 Fort Casey
Situated on the western shore of Whidbey Island in Island County at an elevation of 10 feet, this site occupies a strategic position overlooking Admiralty Inlet at the entrance to Puget Sound.
| Population | 0 |
| Coordinates | 48.1642600, -122.6787800 |
| Altitude | 3 |
| Country | United States |
End: Fort Casey (-122.67878, 48.16426)
Estimated Travel Time
Distance: 2240 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 46h 22m |
| 40 mph (64.37 km/h) | 34h 48m |
| 50 mph (80.47 km/h) | 27h 50m |
| 60 mph (96.56 km/h) | 23h 12m |
| 70 mph (112.65 km/h) | 19h 53m |
| 80 mph (129 km/h) | 17h 22m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.67 | $229.59 | $459.17 |
| Mid-grade | $5.03 | $247.27 | $494.54 |
| Premium | $5.36 | $263.43 | $526.86 |
| Diesel | $6.27 | $308.08 | $616.16 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Arizona · Oct 15, 2026