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ISN to CAT: distance & flight time
Williston (Sloulin Field International Airport) → Cascais (Cascais Airport)
4,471 mi
7,195 km · 3,885 nm
9h 14m
estimated nonstop flight time
+6h
time difference · heading northeast
See live ISN→CAT fares Phone-only fares on this route — call free
Flight time details
4,471 miles nonstop takes roughly 9h 14m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 6-hour time gain when reading arrival times on your ticket.
The two airports
- ISN — Sloulin Field International Airport · Williston, United States
- CAT — Cascais Airport · Cascais, Portugal
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near ISN
- SDY · Sidney - Richland Regional Airport41 mi away
- YEN · Estevan Airport78 mi away
- OLF · L M Clayton Airport89 mi away
- GDV · Dawson Community Airport90 mi away
Near CAT
- LIS · Humberto Delgado Airport (Lisbon Portela Airport)12 mi away
- AVR · Alverca Air Base21 mi away
- QLR · Monte Real Air Base80 mi away
- BYJ · Beja Airport / Airbase89 mi away
Frequently asked questions
How far is ISN from CAT?
The flight distance from Williston (ISN) to Cascais (CAT) is 4,471 miles (7,195 km, 3,885 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ISN to CAT?
A nonstop flight takes about 9h 14m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Williston and Cascais?
Cascais is 6 hours ahead of Williston.
What is the cheapest way to fly from ISN to CAT?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ISN–CAT that never appear on search engines, with no booking fees.