Find cheap flights from Portugal to Seattle

Find cheap flights from Portugal to Seattle

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Round-trip
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Boston (BOS)
Seattle/Tacoma Intl
Wed 12/1
Wed 12/8
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Good to know

Low season

April

High season

July

Average price round-trip

$741

Good deal round-trip

$663

Good deal one-way

$698
Best time to beat the crowds with an average 7% drop in price.
Most popular time to fly with an average 33% increase in price.
(avg. price over the last 2 weeks)
or less
or less

Top tips for finding cheap flights to Seattle

  • Looking for cheap airfare to Seattle? 25% of our users found tickets to Seattle for the following prices or less: From Porto $667 round-trip, from Faro $746 one-way - $704 round-trip, from Lisbon $698 one-way - $718 round-trip
  • Book at least 3 weeks before departure in order to get a below-average price.
  • High season is considered to be June, July and August. The cheapest month to fly to Seattle is April.
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Seattle flight deals.

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Top airlines flying Portugal to Seattle/Tacoma Intl

Scores according to KAYAK customer reviews

8.0
SWISS
Overall score based on 9,086 reviews
8.2
Boarding
7.9
Comfort
8.6
Crew
7.7
Entertainment
7.9
Food
Airline reviews

Pros: "The crew was polite and continuously offering drinks, headphones and food/snacks. Kept us comfortable and happy during the flight!"

Cons: "The seat bottom was very uncomfortable and made my bum sore the rest of the day."

Pros: "I like that the plan wasn’t that full and the movie was great also when I flew back the food and monies was different"
Cons: "More snacks maybe lackerli"

Pros: "The seat was ok, I paid $ 115 per Trip ( total of $ 230) just to sit at the emergency exit to have some leg room and then I am sitting next to the bathroom and people stepping on my feet because they tend to hang out around the bathroom."
Cons: "The flight attendant not wearing perfume. Food was very poor to say the least."

Pros: "the CREW WAS FRIENDLY AND CELEBRATING EASTER WITH THE GUESTS"
Cons: "THE FOOD WAS ADEQUATE, GIVEN THAT WE WERE ON AN AIRPLANE"

Pros: "This was a 12 hour flight that didn’t feel like 12 hours. They movies and other entertainment was very good with new and older movies that didn’t disappoint. The food was great all the way through to the farewell piece of chocolate."
Cons: "The seats on this flight were very tight. I am 5’8 and felt super cramped. The seats themselves were not that bad just small and not a lot of space. If you fly with them don’t expect to kee anything under the seat with you. Also the whole boarding process is a big cluster! There is no real organization to the line or who they are boarding. Make sure you get in the line quickly or you could be waiting awhile."

Cons: "To my shock, my boarding pass while scanning to enter the aircraft was rejected with wild flashing red lights saying my trip was cancelled. Someone else was given my emergency row seat, booked and confirmed 24 hours ahead. It was a full flight but I got a middle seat and continued my long journey home from Kenya"

Cons: "I was asked to check my carry-on. I have used this carry-on more than 50x without an issue. I have even put it in the smaller compartments on smaller Bombardier jets. I don't have an issue with being asked to check luggage, but I resent being asked when others are allowed to take their carry-on onto to the plane without issue. Right in front of me while I was waiting for a baggage tag, others were being checked in with carry-on equal to mine and allowed to take it onto the plane. I can only surmise that my ticket limited me to one bag onto the plane, although they would not tell me this. This was not clear when I booked the ticket nor when I checked in on-line. I had a 40 minute connection in Zurich so was very concerned that my luggage would not make it. Luckily, it did make it to my next stop. Swiss Air seems to have different restrictions than other airlines which I have encountered before. I take ownership that I should be aware of a tickets restrictions but this was a multi-leg trip (5). However, I will tend to avoid Swiss air in the future, to avoid having to research their unique restrictions."

Cons: "The temperature on this overnight flight was sweltering Legroom was poor"

Cons: "Entertainment system was not working"

Pros: "All very comfortable"
Cons: "It was delayed"

Cons: "К сажалению,мне испортили отпуск. Был утеряны мой багаж. Я вынуждена 3 день ходить по магазинам и тратить свое время на отдых,покупая необходимые вещи,те, что необходимо для отдыха. Я потеряла три дня отдыха. И до сих пор я дожидаясь , сижу в квартире и не знаю когда он прибудет. Я крайне не довольна To the planting, I was spoiled vacation. My luggage was lost. I have to go shopping for 3 days and spend my time on vacation, buying the necessary things, those that are necessary for recreation. I lost three days of rest. And so far I'm waiting, sitting in the apartment and I do not know when he will arrive. I am extremely unhappy"

Pros: "The entertainment and food was very good. I also think having fresh fruit available in between meals is one of the most appealing things about SWISS."
Cons: "For some reason, one of the air hostesses refused to let me use the restroom. For over five hours I tried to use the restroom and she kept yelling at me to sit back in my seat, in spite the fact that several other people were using the restroom and several other people were up and moving about, she singled me out and wouldn't let me get up without harassing me. Eventually I appealed to another one of the flight crew who allowed me to urinate, but it was over five hours I had to pee and was inexplicably not allowed to."

Pros: "Friendly staff"
Cons: "Seats were horribly uncomfortable"

Pros: "Service was great and the flight very smooth. Great flight!"

Pros: "Problem free."
Cons: "It was a great flight."

Pros: "My own seat had ample legroom, good crew."
Cons: "Faulty headphone jack and person who kneed me in the back whenever I recline my seat. 8 kilo limit on carry-on luggage."

Pros: "Even though the flight was very short, the team moved quickly through the cabin ensuring everybody had a drink and a snack. They looked quite concerned when I turned down the pretzel sandwich, so I accepted and found it quite good! Also, team made sure my parent with reduced-mobility had a good boarding and transfer experience."
Cons: "As always, seats are narrow. And the "neighbors" were normal-sized. The usual struggle for elbow "air-space" occurred."

Pros: "Flight is super short and was delayed Boarding is terrible - everyone jammed up and pushing in Just an average boarding"
Cons: "Plane was late Self checkin is not for everyone and good half of people did not know how to use the machine and it greatest delayed the process .. cattle is transported better !!!"

Pros: "The flight ,food entertainment was very good. But I don't understand the SWISS airline logic. When I did the check in in Prague and got my boarding pass the told me that the system picked me to have the additional random checkup at Zurich airport. Its ok. If it’s done for security reason why to tell the people ahead of time that they will have additional checkup of bags and personal stuff. If you want to do it for security reason do it ( I want to be safe) but don’t do it for the check mark , it doesn’t make any sense and doesn’t protect us."

Pros: "Food and movies"
Cons: "Staff was not attentative. We were very misinformed on the seat upgrade we paid $100 for. And our liggsge was damaged and they had us walking all over ohare airport for no reason at all instead of addressing the issue at Swiss air."

Cons: "Despite its reputation, Swiss is always late. Their Sunday evening flights always from Stockholm always depart 20-45m late."

Pros: "From the beginning to end the trip was a delight. Crew always on hand and smiling. You really felt welcomed. Lots of food and drinks were on hand throughout the whole trip. It was just wonderful. Cheers to Swiss for providing us with great service."
Cons: "My only complaint is that it took me this long to find this great airline. They will be my to go airline for Europe in the future."

Cons: "Ok, old plane."

Pros: "Swiss being swiss, great service and food was quite nice."
Cons: "Airplane felt old, entertainment system is small and outdated."

Cons: "I did not like they were so strict with the carry on luggage and stopped us at the TSA"

Pros: "I really liked the "About my flight" application on the viewing screens because it always gave me an idea of what we were flying over and how much longer we woulld be in the air. The food was excellent and I was pleasantly surprised that I could have wine with dinner or any time the attendants offered beveragess. The attendants were always professional and helpful. They all were fluent in English as well as several other languages. It was a nice touch when the attendant wore white gloves when he or she was collecting passengers' trash after meals and/or beverage service. I loved the cheese that was served at dinner."
Cons: "My seat was a little confined when I put my carry-on bag in front of me on the flight to Zurich, but it was roomier when I stowed my carry-on in the overhead compartment on the returtn flight."

Pros: "Flight crew were courteous and efficient."

Pros: "Swift ride - no frills- the chocolate square was delicious."
Cons: "Getting off directly onto the tarmac with no gate access- glad it wasn't raining!"

Pros: "I was upgraded for some reason and holy cow was it awesome. Amazing food with more choices of what to eat. Massager in the chair and it nearly lied flat. So amazing and the perfect way to travel on a long flight"

Cons: "I liked everything except the airplane itself, which I hated. I was fortunate enough to get an exit row on my long flight going over; I did not get lucky on my way home. The flights between Zurich and Brindisi were more comfortable than the long haul flights. The long haul flights are abominable and should be outlawed by governments as they are currently configured. The boy next to me literally could not fit his legs/thigh bones in the space provided by his seat. I did okay as I am not tall, until the woman in front of me decided to lean back. It is not her fault, however, though I thought nasty things about her and periodically tried to dig my knees into her back to get her to lift up her seat. The fault belongs entirely to Swiss Air, which chooses to treat human customers as steerage. The only thing that made the experience worse was the impossibility of choosing my seat online for my return because I had only a smart phone with not-great wifi available. Choosing one's seat should not be dependent on having good wifi and a computer, however. It is bad practice to "sell" seat choices. The families around me were not able to sit together because of this shoddy, greedy practice on the part of the airline. It is also not fair, subsequently, that other passengers are faced with giving up the seats they've chosen, or been given, to assist families in sitting together. Honestly, the extent of the greed on the part of airlines nowadays is astonishing. What used to be a thoroughly enjoyable way of traveling has become an ordeal at best."

Cons: "Seats too small."

Pros: "The crew was amazing, also the service given since it was a long flight."

Pros: "It's such a short flight that to me the experience is pretty insignificant. I liked that it was on time and the rest was very average for what I expected in a 45 minutes flight"
Cons: "I would have loved a video"

Pros: "The staff was just fabulous! Very nice and sincere. Beautiful smiles. I admired the lipstick on one and she came back and had the name of it written down for me. MAC here I come."

Cons: "in NY they would not give me a seat/ boarding pass for this flight - they said i had to get one only in zurich. by the time they gave me one in zurich - it was a middle seat and there were no other seats available. i was totally squished in between 2 men [ i am a female] and the seats were sooo small and there was absolutely no room. i was totally uncomfortable and had to sit like this for 4 hours... i did not like this AT ALL"

Cons: "Could use some more seating space"

Cons: "I was taken away from boarding for a random check that took a long time due to not enough staff Entertainment system was broken for about 50 people, even after a reset. Terrible for an overseas flight. Food was very poor, staff lied about resetting the entertainment system. The plane took off 1 hour late and was not allowed to taxi to taxi to the gate for 1 hour, making us extremely late."

Pros: "The crew was excellent. The food was pretty good and service was frequent even in economy."
Cons: "The seats are too close to each other. The couple in front of use reclined the entire flight and they were nearly in our laps. We could not get in and out of our seats to stretch. The flight attendant needed to ask them to sit up during meals so that we could eat."

Pros: "Comfortable, great service and food, free movies."

Pros: "Service. The food was good. Entertainment was good."
Cons: "As a person of color I didn't feel that I received the same warm welcome from some of the attendants. For example the expression on their faces were blank when I said hello. I picked up my food tray and gave it to the attendants very politely. She just took it out of my hand. When the passenger next to me did the same she said thank you very politely. He was Caucasian. Some were very friendly and polite."

Pros: "Very prompt and courteus"
Cons: "Baggage missing for three days. Communication poor."

Pros: "- Lots of snacks selections during the flight - Great selection of Movies - but unable to watch them"
Cons: "- No special treatment for Star Alliance Gold Member - Crew member forgotten my drink order completely - Entertainment system was not working after 7 Restart attempts - The whole entertainment system is very 90's - OLD and ready to retire - There were crumbs or foods left over from previous flights on my seat and tomato sauce on the tray table - Foods selections was not that great"

Pros: "service personnel were excellent. Espresso is great."
Cons: "Business class main meal was disappointing."

Pros: "Flight was cancelled. Had to sleep in Zurich overnight. Airline covered the hotel and dinner bill though"
Cons: "Next morning the flight was delayed . Lost time in Rome and a night in Rone hotel"

Pros: "Chicken with polenta was better than most airplane meals."

Cons: "Narrow feeling seat"

Pros: "Great food and drink options."
Cons: "Due to special meals, food was quite delayed. Flight was also delayed so it was very tight to get to my connection."

Pros: "Good staff, food, service"
Cons: "No leg room for us tall people!"

"Boarded late. Missed first landing attempt, landed almost an hour late and missed connecting flight."

Pros: "The prices were low and the crew was great. A lot of entertainment options, also!"
Cons: "Boarding was rather disorganized"

Cons: "It was a six hour flight. It would have been great if they Offered a second drink."

Pros: "."
Cons: "Plane was too hot!! Ac nor working !"

Cons: "I missed boarding by one minute and was told there was nothing they could do. Our connecting flight landed on the other side of the airport and after literally running through DFW, we were told our flight home had already boarded, we arrived at 6:21, flight left at 6:30. American Airlines screwed us again. Just paid $300 for a rental vehicle so I could make it home."

Pros: "They held the flight for us."
Cons: "Something to eat"

Pros: "Yes!"
Cons: "No more comments!"

Cons: "We were delayed 3 hours for mechanical repairs."

Cons: "They already know they will have a delay but they don’t act before happen"

Cons: "I have never been on an AA flight where the entertainment system has worked all the way through. Additionally, when willl there be plugs on these planes? In a six and half hour flight where you need to use your device (when the system is working), this seems like it is a little old school"

Pros: "My first time flying Alaska Airlines. Absolutely will be back. Comfortable, spacious seating. Staff was professional and friendly. Flight was seamless from beginning to end!"
Cons: "Excellent flight, no issues"

Cons: "The flight comfort was very bad. The plane was extremely warm and people we beginning to feel bad. Several mentioned it and asked multiple times to have the the cabin air conditioning turned down"

Pros: "The entertainment was good with WiFi that worked well"
Cons: "The flight delay was a hassle especially considering the estimated arrival was almost 1am. No information was provided as to why it was almost an hour late but it made for a super late night. Not to mention the seat was unbearably cramped making for an impossible inflight rest... wait, I just mentioned it"

Pros: "Great Crew"
Cons: "More drinks"

Pros: "Absolutely NOTHING"
Cons: "I WANT MY MONEY BACK. We were stuck on a plane for 10 HOURS. No food available. Just sitting there. Communication from the crew SUCKED. Their staffing sucked. I WANT MY MONEY BACK"

Cons: "It was very hot on the plane."

Pros: "comfortable seats"
Cons: "food"

Cons: "Weather related, mostly, so not AA’s fault"

Pros: "Boarding process was really unsmooth here as well. Little delayed. Thankfully this crew was really polite. And not screaming at people this one flight."
Cons: "Ether bursting process."

Cons: "One crew member is not particularly helpful when passengers needed assistance."

Pros: "Nothing, this was a miserable flight."
Cons: "Gate at Philadelphia was tiny with not enough space for everyone on the plane, it was a 6 hour flight and no snacks beyond pretzels were available-not even for purchase. I'd just come off an 8 hour international flight where I was provided lunch, ice cream, a pot pie snack and frequent beverage service. Somehow as soon as you are flying domestic on a slightly shorter flight American Airlines thinks its okay to treat customers like garbage-nothing but some sad pretzels and 2 rounds of drink service was provided for a 6 hour flight. The seats were super uncomfortable with no head rest, no personal entertainment devices were provided, and there was no general entertainment for the whole plane-seriously I've never been so bored. I would have fallen asleep from boredom but the seat was too uncomfortable so I couldn't even do that. The plane landed in Seattle but sat without unloading passengers for 20 minutes because the gate crew wasn't ready. We didn't get our checked baggage for over an hour after landing. When asked, customer service reps said that the S gate was far from baggage claim-seriously I'm not sure how that is a reasonable excuse. Other airlines arrive into S gates and have timely baggage claim service. American Airlines has no standard for timely baggage claim service like other airlines (Alaska) so there were no repercussions for such late baggage service. We left the airport with our luggage over 90 minutes after the plane landed. The entire experience is just another example of American Airlines of why the terrorists won't even fly American Airlines. I was seriously disappointed to find out that the British Airways flights we booked were operated by American instead of BA crews. I seriously will never select this option (or fly American) again if I can help it."

Pros: "Nothing!!!"
Cons: "The seat in front of me reclined so far that the guy in that seat had his head less than a foot from my face and my knees were being smashed by his seat. Very painful."

Pros: "Seats in general Economy ended up being fairly comfortable and headrests would bend enough to actually support my head while sleeping. Nice to have granual baggage tracking info in the AA app."
Cons: "Overhead entertainment video quality was horrible. Awful user interface for trying to figure out and use the personal device streaming entertainment. Did not order food on the flight, but options were very limited for a 5.5 hour night-time flight (8p EST -> 11p PST)"

Pros: "The flight crew was nice. They kept us well hydrated."
Cons: "I expected more from the in-flight entertainment on a 6 hour flight. If I had known I would have brought my own tablet and watched the free in-flight movies that were offered via free Wi-Fi."

Cons: "Flight left early on top of us arriving in Philadelphia late. Hadw the staff been more helpful we would've made the connecting flight. This occurred to multiple people on our flight from Rome."

Cons: "Crew told us bulshit story about strong winds, even though flight times were normal. Diverted the flight to DFW, where we stayed for almost 2 hours fo refueling."

Cons: "No outlet and waited idle for a long time before getting to get off plane also had to walk my bag back bc there was no overhead storage space in the bins which prevented me from getting off the plane sooner"

Cons: "The bathroom supplies were not replenished. In fact, the facial tissue was empty at beginning of flight. When the toilet paper ran out, I finally informed the attendant and they fixed everything. It seems that checking on that stuff was not part of their routine."

Pros: "Nothing!"
Cons: "it was not BA flight American Airlines. For a 6-hour cross-country flight, there was no entertainment of any kind. More than that, no blanket or a pillow was available which made the trip so much worse. Worst of all, the last 90 minutes of the flight all the toilets ran out of water so they can't even be flushed. First time I have ever come across such a problem. Absolutely terrible."

Cons: "Left s half hour late because they had to shift cargo, then we taxied on the runway for what seemed like a half hour. My wife and I purchased our tickets in July but could never pick our seats and ended up 9 rows apart."

Pros: "Flight was great. Crew was very attentive and the flight was under booked giving my wife and I an empty middle seat. The entertainment was vast consisting of movies and TV shows to pass the time."
Cons: "n/a"

Cons: "No entertainment and no gate printed on my ticket. My flight to Dallas was delayed and I had to waste time figuring out what gate to take a train to."

Pros: "Left on time, relatively comfortable considering I had already spent almost 9 hours on a previous flight, landed 30 minutes early"
Cons: "Mixed feelings about the entertainment app, I was pleased that something was available at all, however had the person sitting next to me not mentioned I needed an app to watch the in flight entertainment moments before it would have been too late to use the internet to download it, I would not have been able to use it, unless paying for a limited time package from AA to use the internet to download the app. A better job of advertising of the gogo app is needed more than the booklet in the seat pocket. Also I was only able to watch one movie, after that the system kicked me out saying high usage was making it not work for me. The gate changed a couple of times which had me trawling up and down the H and K concourses, could have done without that after the 9 hour journey I had already taken."

Pros: "Comfortable, very friendly helpful staff"
Cons: "Nothing, well I miss the movies shown on their divides rather than my tablet"

Pros: "Everything was great, but they didn't serve ANY complementary food on a 5 hour flight. What happened to lunch?"

Pros: "Nothing. Someday the airline industry will be disrupted and we'll all remember this and say, "can you believe what we used to put up with, and how expensive it was?!""
Cons: "No decent food available, they ran out. People allowed to play movies loudly with no headphones for 5 hours straight. Uncomfortable seats with no cushioning."

Cons: "Dry / borderline rude staff and hostess. Dated plane. Tiny seats. But that is pretty much the baseline of airlines in the US. When will carriers start to take note from International carriers..leaps and bounds ahead."

Pros: "It was not a full flight, so I was given an aisle instead of a middle seat...for which I was grateful."
Cons: "Flight was 6 hours...almost as much as my previous international flight, yet food and drink was only available for purchase. No entertainment options. Plus, wireless was $21! I needed to work and had to purchase, but that is really quite a rip off compared to other airlines."

Pros: "This flight was amazing! The crew was friendly and helped me when I had a panic attack from flying. It was very appreciated"

Pros: "Excellent crew."
Cons: "Obese people should have to declare their weight and pay for two seats."

Cons: "Longer flights should have screens in the headrests"

Cons: "I asked the woman at the gate prior to boarding if there were electrical outlets on the plane. She looked it up and said, its an Airbus, yes they have outlets at each seat. I didn't worry too much about charging my devices at my layover because I knew I could charge them on the plane. When I got on it was clear that there was no outlets, no video on the backs of seats, no devices being handed out for purchase. Nothing. I'm definitely used to more updated planes, but I would have been ok without the misinformation. I ended up on a 4 hr flight bored out of my gourd—which could have been avoided."

Cons: "Despite arriving more than an hour ahead of time, I had to wait in a long line to get to the ticket counter and by the time I got there the assistant refused to check my bag. I then had the choice of catching another flight standby, possibly not even arriving on the same day, or changing my ticket for an obscene amount of money. I hope to never deal with AA again."

Cons: "As it was the continuation of an international flight, I believe I travelers like me deserved to be treated with free food and not just drink and water."

Pros: "In-seat entertainment options. Good system, easy to use, lots of good options. Why couldn't you have had this on our flight from Europe?"
Cons: "The almost 30 minute wait on the tarmac AFTER we landed to find a free gate. Did you not know we were coming???? The last thing we needed after a very long day of flying."

Pros: "Chairs were very comfy and wider than some airlines."
Cons: "Crew not overly friendly and not very attentive, and there were lots of empty seats so there wasn't much excuse. Also, I had an issue with the plane. I think no screens on a cross-country flight is not good business. Not everyone is savvy with go-go inflight. And if there are no screens, could there at least be outlets? I was so tired after my Paris flight and wanted to chill with some go-go entertainment, but my battery was low and there were no outlets. I know not all flights can have these luxuries, but if the flight is over five hours, I think it should be better equipped."

Pros: "I was upgraded to the comfort economy after waiting 10 hours at DFW for my flight."
Cons: "After being in DFW airport for 10hrs all I wanted to do was watch a movie on board and sleep. Go figure, my TV didn't work. I called the attendant and she said she would reset them. The "resetting process" took a while. She attempted, and the other stewardess did as well. They said that the TV issue that *some* of the people were experiencing wasn't able to be fixed by them and only by the company that provides it's service. So there wasn't anything that could be done. I know that at least the two guys that were traveling next to me had issues with the tv monitors as well. It was just driving it home that I will never fly on American Airlines again. I don't ask for much these days while flying, it's not like it's a luxury anymore. But the saddest part is that customer satisfaction is completely out of the question. Just pay the extra money and fly another airline. -Deidre Fugate"

Pros: "I did not like have to stay in a hotel room when I could be sleeping in my room I'm on medication I don't even have my medicine with me because American Airlines had engine trouble in Dallas we went back to the Terminal 3 times before they ever got it fixed slit throat me late getting into Seattle and I missed the flight to Yakima I don't feel that this was my fault I didn't nothing to delay the airplanes and I walked as fast as I could to the terminal on in Seattle so I didn't have such a pleasure to little trip but your airline get put me up in a hotel but it's still not does not change the fact I have my blood pressure medicine and about 10 other medications but my blood pressure is the biggest and I will think twice before I fly Alaska Airlines again"

Pros: "I had my first experience in the Admiral's Lounge at O'Hare and enjoyed it very much."
Cons: "My traveling companion's tray table was disgusting when she folded it down for beverage service. She asked for a wet towel and the flight attendant was snarky but went to get one without even looking or asking to see what the problem was. Her entertainment console wasn't working so they reset it but instead it reset mine (two seats over) they did this again and I let them know it was resetting mine. I was told that I was not in the seat they were resetting for ...I inquired if perhaps they should try to reset mine and see if it would, in fact, fix hers..it did. When she slipped off her shoes the carpet was soaking wet. This was a really crummy, crummy flight."

Pros: "Nothing"
Cons: "See above comments"

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COVID-19 information

Safety measures for airlines flying from Portugal to Seattle

Airlines flying from Portugal to Seattle have enacted additional safety measures and adjusted policies to better accommodate travelers. Policies vary by airline.

Heightened sanitation

Daily cleaning, installation of cabin HEPA filters on flights from Portugal to Seattle

Mandatory masks

Masks required on board, masks provided on flights from Portugal to Seattle

Social distancing seating

Middle seats unavailable to book on flights from Portugal to Seattle

Pre-flight testing

Testing for antibodies, testing for symptoms for flights from Portugal to Seattle

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