Your next trip, last seen at €298
Lowest observedWhen to fly
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The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.
- Lowest observed
- €298, departing 17 Apr 2027 (Last checked: 1 Oct 2026)One-way fare · Priced departure days checked in the last 14 days: 75Check live prices for this route
- Airlines seen
- Aer Lingus, Air Canada, Air France, Alaska Airlines, American Airlines, Delta Air Lines +9 more
- Typical journey time
- 25h 32m
About this route
Explore the fares we observed from San Diego to Porto. Prices move often, so pick your dates to see the latest options.
- Route distance
- 9,020 km
- Typical journey time
- 25h 32m
- Airlines seen
- Aer Lingus, Air Canada, Air France, Alaska Airlines, American Airlines, Delta Air Lines +9 more
- Seen on fares with a connection
- Alaska Airlines, United Airlines, Frontier Airlines, JetBlue, Ryanair, KLM +8 more
- Alternative airports
- CLD
Route-level information; individual journeys vary.
We have not observed non-stop service on this route; the fares shown include at least one stop.
A clearer picture of your fare
Airport to city: straight-line distance
- San Diego International Airport (SAN) → San Diego, city gazetteer reference point (32.7153, -117.1573): ≈ 4 km.
- McClellan-Palomar Airport (CLD) → San Diego, city gazetteer reference point (32.7153, -117.1573): ≈ 47 km.
- Porto Airport (OPO) → Porto, city gazetteer reference point (41.1579, -8.6291): ≈ 11 km.
Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.
Lowest fare by departure month
Cheapest month from San Diego to Porto: October 2026, from €326 (checked 11 Oct 2026).
| Month | Lowest fare | Priced days |
|---|---|---|
| October 2026 | €326 | 19 |
| November 2026 | €399 | 26 |
| December 2026 | €415 | 20 |
| January 2027 | €350 | 10 |
Lowest fare by day of the week
Cheapest day of the week from San Diego to Porto: Saturday, from €326 (checked 11 Oct 2026).
| Day | Lowest fare | Priced days |
|---|---|---|
| Monday | €351 | 11 |
| Tuesday | €359 | 13 |
| Wednesday | €382 | 10 |
| Thursday | €411 | 11 |
| Friday | €362 | 9 |
| Saturday | €326 | 10 |
| Sunday | €373 | 11 |
One-way fares checked in the last 14 days. Each figure is the lowest priced departure day we saw, not a guaranteed fare.
Lowest fare by days before departure
Lowest fare from San Diego to Porto by days until departure (8 to 30 days): €326 (checked 11 Oct 2026).
| Days before departure | Lowest fare | Priced days |
|---|---|---|
| 0 to 7 days | €440 | 8 |
| 8 to 30 days | €326 | 23 |
| 31 to 60 days | €404 | 25 |
| 61 days or more | €350 | 19 |
One-way fares checked in the last 14 days. Each figure is the lowest stored fare for that distance to departure, not a price forecast.
Fares for different departure dates, checked now; not a guide to when to book.
Lowest one-way fare we saw per airline
Cheapest airline from San Diego to Porto: Delta Air Lines, from €308 (checked 1 Oct 2026).
| Airline | Lowest fare | Priced days |
|---|---|---|
| Delta Air Lines | €308Apr 17, 2027 | 3 |
| United Airlines | €308Apr 17, 2027 | 21 |
| KLM | €346Mar 4, 2027 | 3 |
| Frontier Airlines | €350Jan 9, 2027 | 10 |
| Alaska Airlines | €359Oct 27, 2026 | 25 |
| Lufthansa | €401Jan 4, 2027 | 3 |
| Ryanair | €404Nov 15, 2026 | 4 |
| JetBlue | €428Nov 7, 2026 | 7 |
One-way fares checked in the last 14 days. An airline listed here had a fare on at least 3 departure days. Each figure is the lowest we saw, not a guaranteed fare. Connecting itineraries are included; the date is the departure day of that fare.
Frequently asked
How much is a flight from San Diego to Porto?
The lowest fare we have observed is €298, found on 1 Oct 2026. Prices move, so read it as a floor rather than a quote.
When is the cheapest month to fly from San Diego to Porto?
Cheapest month from San Diego to Porto: October 2026, from €326 (checked 11 Oct 2026).
Are there direct flights from San Diego to Porto?
Our data holds no non-stop flight from San Diego to Porto. The fares on this page include at least one stop.
Which airlines fly from San Diego to Porto?
These are the carriers we have seen on the route: Aer Lingus, Air Canada, Air France, Alaska Airlines, American Airlines, Delta Air Lines +9 more.
How long does the flight from San Diego to Porto take?
The average journey time across the 77 fares we observed is 27h 18m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.
How many of the observed San Diego to Porto fares were non-stop?
None of the 77 fares we observed was non-stop; every one included at least one stop. That describes our observations, not every flight that operates.
Which day of the week is cheapest from San Diego to Porto?
Cheapest day of the week from San Diego to Porto: Saturday, from €326 (checked 11 Oct 2026).
Which airline has the lowest fare from San Diego to Porto?
Cheapest airline from San Diego to Porto: Delta Air Lines, from €308 (checked 1 Oct 2026).
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide
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Recently observed fares. Prices may change.
Last checked: 11 Oct 2026