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GRK to OPO: distance & flight time
Killeen (Robert Gray Army Air Field Airport) → Porto (Francisco de Sá Carneiro Airport)
4,804 mi
7,731 km · 4,174 nm
9h 53m
estimated nonstop flight time
+6h
time difference · heading northeast
See live GRK→OPO fares Phone-only fares on this route — call free
Flight time details
4,804 miles nonstop takes roughly 9h 53m 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
- GRK — Robert Gray Army Air Field Airport · Killeen, 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 GRK
- HLR · Hood Army Air Field8 mi away
- AUS · Austin Bergstrom International Airport61 mi away
- TPL · Draughon Miller Central Texas Regional Airport26 mi away
- ACT · Waco Regional Airport52 mi away
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 GRK from OPO?
The flight distance from Killeen (GRK) to Porto (OPO) is 4,804 miles (7,731 km, 4,174 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GRK to OPO?
A nonstop flight takes about 9h 53m 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 Killeen and Porto?
Porto is 6 hours ahead of Killeen.
What is the cheapest way to fly from GRK to OPO?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GRK–OPO that never appear on search engines, with no booking fees.