Route brief · HOU → OPO
Houston → Porto
$736
round-trip · too little price history on this route to compare
Apr 6 '27 – Apr 27 '27 · 21 nights
United1 stop
Cached fare — the booking search re-prices live before you pay.
Destination briefOPOPortoGranite, port wine and a river gorge through the middle — cheaper and steeper than Lisbon.Best windowMay–Jun · Sep–OctAirportsFrancisco Sá Carneiro (OPO)All routes into PortoWhen this route gets cheap.
Best time to be in Porto: May–Jun · Sep–Oct. Fare history for this route is still thin, so we make no seasonal call yet.
The cheapest itinerary we are tracking makes one stop and takes about 10.5 hours outbound, on a 21-night trip — ticketed under United, which on a connecting fare need not operate every leg. At $736 for 7,636 km each way, that works out to about $48 per 1,000 km flown. That is about the $44 typical of long-haul fares here. Across the 11 departure cities we track at a similar distance from Porto, this fare ranks 7th — 2.2× the $335 we hold from Dubai. That puts it in the cheaper half of the 28 routes of similar length we watch out of Houston, where the middle fare is $900. We have 1 month of cached prices for this route so far — not enough to call a fare cheap or expensive, so we publish the price without a percentage.
Route facts
- Airports
- Bush (IAH) · Hobby (HOU) ↔ Francisco Sá Carneiro (OPO)
- Flight time
- ~10.5 hours outbound
- Distance
- ~7,636 km each way
- Airlines on the board
- United
- Itineraries
- Connections on current fares
- Best months to visit
- May–Jun · Sep–Oct
HOU → OPO, answered.
How far in advance should I book HOU → Porto?
We do not publish a number for this, because we cannot measure it yet. Answering it honestly means watching the same departure date on this route over many weeks as it approaches, and that archive is still filling up — so any "book N days ahead" figure here would be borrowed from somewhere else rather than measured. See /guides/what-moves-a-flight-price/ for the levers we can measure.
Are there nonstop flights from Houston to Porto?
The current cheapest fares involve a connection, ticketed under United. Nonstop options exist on many dates at higher prices — check the live search for your exact dates.
Are these prices guaranteed?
No — these are cached fares found on real searches (this one on August 24). Airlines reprice constantly, so the booking search re-checks the live price before you pay. Fresher finds are far more likely to still be available.
Next step
Sleeping in Porto?
Lock the flight first — then compare stays for Apr 6 '27 – Apr 27 '27 · 21 nights.
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Missed it?
Cached fares expire. This route has a feed of its own — follow it and the next HOU → OPO drop reaches you as soon as we find it.
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