$403 Cheap United flights from Boston to Porto (BOS to OPO)

Find The Best Day To Fly from Boston to Porto

Amazing United BOS to OPO Flight Deals

The cheapest flights to Dr. Francisco de Sa Carneiro found within the past 7 days were $374 round trip and $403 one way. Prices and availability subject to change. Additional terms may apply.

Tue, Oct 21 - Thu, Nov 6
BOS
Boston
OPO
Porto
$374 Roundtrip, found 5 days ago
$374
Roundtrip
found 5 days ago
Select United flight, departing Tue, Oct 21 from Boston to Porto, returning Thu, Nov 6, priced at $374 found 5 days ago
Tue, Oct 21 - Thu, Nov 6
BOS
Boston
OPO
Porto
$378 Roundtrip, found 5 days ago
$378
Roundtrip
found 5 days ago
Select United flight, departing Tue, Oct 21 from Boston to Porto, returning Thu, Nov 6, priced at $378 found 5 days ago

Frequently asked questions

Can I catch a flight from Logan Intl. Airport to OPO right now?
For any current OPO quarantine requirements and travel advice, go to the Covid-19 Travel Advisor. Check before you book your flight, so you don't get caught out.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to Dr. Francisco de Sa Carneiro Airport (OPO), please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.
United Airports
Hop on a(n) United flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
ORDUSAO'Hare Intl.227
DENUSADenver Intl.226
IAHUSAGeorge Bush Intercontinental136
IADUSAWashington Dulles Intl.100
SFOUSASan Francisco Intl.64
LAXUSALos Angeles Intl.23
EWRUSALiberty Intl.20
FRADEUFrankfurt Intl.19
NRTJPNNarita Intl.19
PEKCHNCapital Intl.16
*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.