Need help booking?
Unpublished phone-only deals available
DUC to OPO: distance & flight time
Duncan (Halliburton Field) → Porto (Francisco de Sá Carneiro Airport)
4,671 mi
7,517 km · 4,059 nm
9h 38m
estimated nonstop flight time
+6h
time difference · heading northeast
See live DUC→OPO fares Phone-only fares on this route — call free
Flight time details
4,671 miles nonstop takes roughly 9h 38m 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
- DUC — Halliburton Field · Duncan, United States
- OPO — Francisco de Sá Carneiro Airport · Porto, 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 DUC
Near OPO
- BGZ · Braga Municipal Aerodrome26 mi away
- VRL · Vila Real Airport50 mi away
- VSE · Aerodromo Goncalves Lobato (Viseu Airport)55 mi away
- VGO · Vigo Airport68 mi away
Frequently asked questions
How far is DUC from OPO?
The flight distance from Duncan (DUC) to Porto (OPO) is 4,671 miles (7,517 km, 4,059 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from DUC to OPO?
A nonstop flight takes about 9h 38m 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 Duncan and Porto?
Porto is 6 hours ahead of Duncan.
What is the cheapest way to fly from DUC to OPO?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on DUC–OPO that never appear on search engines, with no booking fees.