Flights Seattle → Porto
As of October 2026, economy flights from Seattle to Porto have a typical range USD 342–886, median USD 357. Full range across all 100 offers: USD 333–5149. We analyzed 100 offers from 15 airlines in a single price check.
Preview snapshot — prices change. Search for live results.
Data collected by LetsFG's multi-source price checks — every airline and the major booking sites checked for this route. How we collect data →
Best offers by airline: Seattle → Porto
Based on 100 offers · October 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: Seattle → Porto
Add-on pricing from the cheapest available offer per airline · October 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| Lufthansa | Included | USD 35 | — |
| Air France | Included | USD 35 | — |
| Delta | Included | USD 35 | — |
| United | Included | USD 35 | — |
| KLM-Royal Dutch Airlines | Included | USD 35 | — |
| Air Canada | Included | USD 30 | — |
| British Airways | Included | USD 65 | — |
| Iberia | Included | USD 30 | — |
| Alaska Airlines | Included | USD 35 | — |
| Turkish Airlines | Included | Included | — |
| WestJet | Included | USD 30 | — |
| TAP Air Portugal | Included | USD 30 | — |
Fees are estimates from the prices we checked and may not reflect your specific itinerary, booking class, or payment method. Run a live search for exact pricing.
How much do flights from Seattle to Porto cost?
Based on 100 offers · October 2026
Seattle to Porto flights ranged from USD 333 to USD 5149 across 100 offers analyzed in October 2026. The chart below shows how prices distributed across all 100 offers.
These 100 offers (October 2026) span multiple departure dates and booking windows — your travel dates may fall anywhere in this distribution. Only a live search shows where your specific trip lands.
50% of offers priced between USD 343 and USD 526
What hidden fees do Seattle to Porto flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on Seattle to Porto routes. The breakdown below is based on 100 offers analyzed in October 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| LH | 45 | 9% |
| AF | 47 | 12% |
| DL | 45 | 9% |
| UA | 45 | 11% |
| KL | 47 | 9% |
| AC | 42 | 9% |
| BA | 80 | 17% |
| IB | 42 | 10% |
| AS | 45 | 2% |
| TK | 10 | 1% |
| WS | 42 | 3% |
| TP | 40 | 2% |
British Airways: base ~USD 387 + fees USD 80 = ~USD 467 total. Turkish Airlines: base ~USD 830 + fees USD 10 = ~USD 840 total.
British Airways's USD 80 ancillary fees narrow the gap with Turkish Airlines's lower-fee model — the USD 443 base difference shrinks to USD 373 after fees. Always compare total cost, not just the advertised base fare.
Estimates based on median total minus average ancillary fee. Actual base fares vary by itinerary.BA charges 8.0x more in ancillary fees than TK on this route. Compare total-cost options when booking.
Run your search to see itemized fees for your itineraryWhich airline is cheapest from Seattle to Porto?
15 airlines flew Seattle to Porto in this dataset. Knowing the airline isn't enough — the typical fare range below shows how far prices swing on each one. Median and range include all fees we recorded.
Even on the cheapest airline (Delta), fares ranged USD 341–347 in this snapshot. Your exact price depends on your dates and how far ahead you book — run a live search to see your number →
| Airline | Offers | Typical range (USD) | Median (USD) | Fees (USD) |
|---|---|---|---|---|
 Delta | 9 | 341–347 | 343 | n/a |
 Delta Air Lines | 30 | 343–915 | 347 | 45 (13%) |
 American | 6 | — | 348 | n/a |
 British Airways | 1 | — | 348 | n/a |
 Iberia | 5 | 357–560 | 357 | 42 (12%) |
 Air France | 4 | 334–459 | 360 | 47 (13%) |
 KLM | 6 | 342–921 | 364 | 47 (13%) |
 United Airlines | 11 | 339–498 | 368 | 45 (12%) |
 Lufthansa | 4 | 346–664 | 455 | 45 (10%) |
 British Airways | 11 | 353–601 | 467 | 80 (17%) |
 Air Canada | 3 | 380–527 | 526 | 42 (8%) |
 Turkish Airlines | 3 | 668–876 | 840 | 10 (1%) |
 WestJet | 1 | — | 1225 | 42 (3%) |
 TAP Air Portugal | 2 | 2033–2050 | 2042 | 40 (2%) |
 Alaska Airlines | 4 | 566–5127 | 2911 | 45 (2%) |
Where do the best Seattle → Porto prices come from?
We checked direct airlines, travel agencies, and meta-search for this route. On this route the lowest median came from meta-search sources, but the cheapest channel shifts by route and date — which is exactly why a live search across all of them wins.
We compare every airline and the major booking sites but never disclose which — that's our edge. Prices are the ones we observed and aren't official data from any platform. Run a live search and we bring you the cheapest, wherever it is.
Key facts: Seattle to Porto flights
- Full-service carriers on Seattle–Porto cost 0.6x more than budget airlines (USD 720 vs USD 1225 median; overall median USD 357).
- BA charges 8.0x more in ancillary fees than TK — USD 80 vs USD 10 avg per booking.
- The same route priced USD 138 apart depending on where it was booked — the lowest median was USD 343. We search every airline and the major booking sites at once so you always see that lowest price.
Frequently asked questions
- How much does a flight from Seattle to Porto cost?
- Based on 100 offers analyzed, Seattle to Porto flights range from USD 333 to USD 5149, with a median price of USD 357. Search for your specific dates →
- What hidden fees should I expect on Seattle to Porto flights?
- On average, ancillary fees (bags, seat selection) add USD 48 to the base fare on Seattle to Porto flights. See itemized fees for your itinerary →
- Which airline is cheapest on Seattle to Porto including all fees?
- Delta has the lowest median fare on Seattle to Porto at USD 343 (median across 9 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest Seattle–Porto flights?
- It depends on your dates — no single site is always cheapest. We search every airline and the major booking sites at once (travel agencies and meta-search included) and surface whichever is lowest; the best median in this snapshot was USD 343. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on Seattle to Porto routes?
- Seattle to Porto has 15 airlines competing, creating a price range from USD 333 to USD 5149 across 100 offers. Prices on this route change with booking timing, advance purchase, and ancillary add-ons. Find where your trip lands in the distribution →
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