$219 Find Cheap Flights to Sines

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Sines departing on 10/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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Cheap Flights to Sines

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights to Sines that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals to Sines

KAYAK's recommended round-trip deals from the most popular airlines that fly to Sines.
Discover the best prices for you by selecting your travel dates on KAYAK.
SWISS Logo
8:30 pm - 2:45 pmJFK-LIS
13h 15m1 stop
SWISS Logo
5:55 am - 4:35 pmLIS-JFK
15h 40m1 stop
$411SWISS
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Wed, Jun 4 - Sun, Jun 8
Iberia Logo
9:45 pm - 5:05 pmMIA-LIS
14h 20m1 stop
Iberia Logo
9:05 am - 8:00 pmLIS-MIA
15h 55m1 stop
$440Iberia
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Wed, Oct 22 - Wed, Nov 5
TAP AIR PORTUGAL Logo
10:35 pm - 10:55 amIAD-LIS
7h 20mnonstop
TAP AIR PORTUGAL Logo
12:00 pm - 3:20 pmLIS-IAD
8h 20mnonstop
$467TAP AIR PORTUGAL
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Sat, Sep 20 - Tue, Oct 7
Delta Logo
6:30 pm - 5:30 pmMIA-LIS
19h 00m2 stops
Delta Logo
10:00 am - 6:39 pmLIS-MIA
13h 39m1 stop
$483Delta
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Mon, Oct 27 - Thu, Nov 6
Delta Logo
11:15 am - 11:15 amMIA-LIS
19h 00m2 stops
Delta Logo
5:30 am - 9:04 pmLIS-MIA
20h 34m2 stops
$494Delta
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Wed, Oct 22 - Wed, Nov 5
TAP AIR PORTUGAL Logo
5:45 pm - 6:05 amIAD-LIS
7h 20mnonstop
TAP AIR PORTUGAL Logo
5:30 pm - 8:50 pmLIS-IAD
8h 20mnonstop
$511TAP AIR PORTUGAL
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Mon, Sep 15 - Mon, Sep 29
British Airways Logo
6:28 am - 9:05 amSFO-LIS
18h 37m1 stop
British Airways Logo
12:30 pm - 11:59 pmLIS-SFO
19h 29m2 stops
$604British Airways
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Tue, Aug 12 - Thu, Aug 21
United Airlines Logo
11:15 am - 10:15 amSFO-LIS
16h 00m1 stop
United Airlines Logo
11:00 am - 9:37 pmLIS-SFO
18h 37m1 stop
$608United Airlines
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Mon, Oct 27 - Thu, Nov 20
United Airlines Logo
10:58 am - 9:20 amMIA-LIS
17h 22m2 stops
United Airlines Logo
11:25 am - 3:12 pmLIS-MIA
32h 47m2 stops
$617United Airlines
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Tue, Sep 23 - Tue, Sep 30
British Airways Logo
7:15 pm - 11:10 pmMIA-LIS
22h 55m1 stop
British Airways Logo
8:45 pm - 1:20 pmLIS-MIA
21h 35m1 stop
$628British Airways
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Mon, May 12 - Tue, May 20
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Good to know - Book Cheap Sines Plane Tickets

Low seasonJanuary
High seasonSeptember
Cheapest flight$219
Best time to beat the crowds with an average 26% drop in price.
Most popular time to fly with an average 6% increase in price.
Flight from Boston to Lisbon

Flights to Sines: the best tips from KAYAK users' own experiences

Insights shared by verified travelers who flew to Sines 
FlorenceFlew with TAP AIR PORTUGALEWR-LISDec 2024
Both flights needed a bus from terminal to plane and plane to terminal. The transfer to the connecting flight at Lisbon was quick and easy with luggage checked thru to Venice.
Verified travelerFlew with TAP AIR PORTUGALBOS-LISFeb 2025
In future I will try to fly Air France or Air Canada when flying from the US to Lisbon.
Jose AntonioFlew with TAP AIR PORTUGALMIA-LISDec 2024
If you have connections make sure they are at least tree hours from your landing time
Verified travelerFlew with British AirwaysPHL-LISSep 2024
Make sure you arrive early enough for boarding. I had a 1 hr layover from Charleston that that was just enough time to get off the plane and walk over to the international side before they started boarding.
DavidFlew with TAP AIR PORTUGALEWR-LISOct 2024
There is not much at terminal B after passing the security… not even Starbucks or McDonalds
MariaFlew with TAP AIR PORTUGALMIA-LISSep 2024
Watch out if you take a late flight because the food will be bad
RoseFlew with TAP AIR PORTUGALMIA-LISJun 2024
Fly economy. Not that much different from Business and a lot cheaper
LexFlew with TAP AIR PORTUGALIAD-LISAug 2024
I had long wait at customs. Please plan accordingly.
ThuFlew with TAP AIR PORTUGALSFO-LISApr 2024
Weigh bags. They will check. Check in with gate or desk. Sometimes the e ticket will not work for boarding.
MaximFlew with TAP AIR PORTUGALBOS-LISMar 2024
I was waiting for a flight boarding announcement in the Lounge in terminal C at Logan Airport in Boston, but the announcement never came. If I did not go to the gate to check, I might have missed the flight. So, do not count on the airline to communicate flight boarding information to the lounge staff. They are supposed to do that, but, apparently, sometimes it does not happen.

FAQs - booking Sines flights

  • How long is the flight to Sines?

    Flights from Chicago8h 37m
    Flights from Washington, D.C.7h 51m
    Flights from Newark7h 35m
    Flights from Boston7h 02m
    Flights from Miami8h 44m
  • What is the cheapest flight to Lisbon?

    In the last 3 days, the cheapest flight deal to Lisbon was found on the route from Boston, at $411 return. The most popular connection is from Newark to Lisbon and KAYAK users have found round-trip deals for as low as $491 in the last 3 days.

  • Which airlines fly to Lisbon?

    Many airlines fly to Lisbon, the most common ones being TAP AIR PORTUGAL, Delta, and United Airlines. See the amount of flights per week for popular airlines flying to Lisbon.

  • How to fly to Sines?

    You cannot fly directly to Sines. KAYAK recommends you fly to Lisbon Humberto Delgado (LIS) (58.41 miles from Sines). From there you can rent a car or get a taxi.

  • What airports are near Sines?

    The closest airport is Lisbon Humberto Delgado (LIS) (58.41 mi). Other nearby airports are Cascais Aerodrome (CAT) (59.06 mi) or Faro (FAO) (81.74 mi). KAYAK recommends you fly to Lisbon Humberto Delgado.

  • How far is Lisbon Humberto Delgado Airport from central Lisbon?

    The distance between Lisbon Humberto Delgado Airport and downtown Lisbon is 4 miles.

  • What is the name of Lisbon’s airport?

    There is only 1 airport in Lisbon, called Lisbon Humberto Delgado Airport (LIS). It can also be referred to as Humberto Delgado, Lisbon, Lisbon Humberto Delgado, Lisbon Portela, or Portela.

  • How does KAYAK find such low prices on flights to Sines?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights to Sines.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket to Sines?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sines is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights to Sines?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sines with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight to Sines?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sines up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to Sines

  • There is no major airport in Sines. It is instead served by Lisbon Humberto Delgado Airport.
  • Looking for cheap airfare to Sines? 25% of our users found round-trip tickets to Sines for the following prices or less: From Boston $1,371, from Los Angeles $1,571, from Miami $1,722
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Sines flight deals.

Top 5 airlines flying to Sines

Need help choosing which airline to fly with from the United States to Sines? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 7934 reviews
7.9Comfort
8.2Boarding
7.9Entertainment
7.3Food
8.5Crew
Airline reviews

Our bag was lost so that made unnecessary chaos On our trip

6.0 GoodBarbara, Apr 2025JFK - FCO
Read more Delta reviews

Our bag was lost so that made unnecessary chaos On our trip

Delta is my preferred airline. I've traveled with them for years. On time in most cases, good communication, easy to use app. Most planes are pretty nice. I was on a CRJ 700/900 however, which was pretty badly aged inside and needed a refresh. No infotainment, unreliable wifi, best to download before boarding or bring a book. Food choices are really just snacks on this flight, nice variety but about what you'd expect. Great staff and prompt in departure and early arrival too. Overall quite satisfied.

Crew was friendly Love the entertainment in the seat head rest.

Delta flight was on time, seats were comfortable, and crew was nice.

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

Delayed take-off. Very small plane so very scary with lots of bumps during the flight. Would never fly Delta on short flights in small 80 seaters plane again! Felt relieved when landed.

The worst part was I was NOT allowed in the lounge even though I was holding a first class ticket and have a premium American Express card. I have flown Business or First Class with many airlines. Delta is the ONLY one who does not extend this courtesy to anyone except people who hold the very expensive American Express card. As a result, I won’t fly Delta if I have any other choice.

It was an overnight flight and I desperately needed coffee before we landed, but Delta does only one beverage service, and that is shortly after takeoff, not before landing at 5 am.

A little bumpy ride . No food was being provided due the the turbulence. That was ok it was a short flight to my standards.

Simply outstanding. Their new lounge for Delta One customers is a cut above the rest.

Everything is good except the dinner and breakfast. The sandwich is very delicious. Toilet is clean, I only use one of them. Flight attendants are very nice. 👍👍

A bit rush for transit. Food and entertainment are not available

Boarding was a little difficult. The gate area at O'Hare was very small and crowded due to multiple gates in the area. Could not hear the intercom, so had to rely on signage to see when my group was boarding and the signage was blocked by passengers standing in the gate. Flight was great and we arrived in Montreal on time.

Multiple delays and not straight answer from the United team

For economy, it was very good. Staff was great, they even let some of us change seats for more leg room... Put an empty seat between us which was fantastic for a 12hr flight. Onboard entertainment was excellent, I think over 200 choices of movies/tv/etc The bad was the barely/nonfunctional wifi that cost either $16.99 or 1700 miles (full flight). It was atrocious... Definitely the worst of the last 3 long haul major airlines I was on the last few months.

Stewardess spilled orange juice on my clothes/seat no help no apology just threw napkins at me to clean the mess up. Not Happy.

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

The plane pushed back from the gate on time. However, it stopped on the ramp, and we waited for over 20 minutes before the aircraft pulled back to the gate. Apparently, something of importance had to be removed from the aircraft by the gate agent. I found this to be odd. The delay was not significant, but I felt that whatever was on the aircraft that had to be taken off, should’ve been done before we pushed back from the gate.

I didn’t get on plane. Passport being processed by consulate with visa application. Tried to cancel through underpricer after purchasing cacelling for any reason. No dice, they are thieves.

Electric plugs didn't work. Entertainment system wasn't working

Several delays. Next flight was worse. Did not arrive home until 2am PT

Very helpful ground crew after an earlier flight delay and being rebooked on a different flight.

Everything about the flight was lovely…We left early, arrived early, cabin crew were efficient and helpful. Flight was easy and most pleasant.

First world problems, but still… We were seated in first class and asked for a cocktail on a very short, 50 minute flight. After our drink order was taken, a half hour went by, and we noticed that every other person in the small plane had been served except for us. We got up to ask about it, the drinks finally came, then were taken away three minutes later since the flight was so short. Really strange situation, on the other hand, we were in Utah.

We missed our flight. The boarding pass had the wrong gate and by the time we received the text from Kayak, our flight was already gone. I’ll never use Kayak again and will go direct to the airlines in the future.

Boarding took forever, the plane was cramped and cold, and the seatbelt song came on constantly throughout the red eye flight with a loud pre-recorded message playing each time

Cabin felt crammed Snacks are lame But crew was super efficient getting us out on time despite delay

Took off on time and successfully avoided weather that looked to be a problem along the way

There were five broken seats on the plane. The crew was very rude in telling people they had to get off the plane and get a flight the next day. No call for volunteers, but telling people they had to get off. One woman was flying with her elderly mother and daughter and was told she had to leave or all three had to leave. Fortunately, a volunteer offered to stay. The situation was handled poorly.

The flight to Tokyo AA61 took off about two hours late, but then had to turn back. By that time the crew had to be replaced. Then they kept promising to take off in an hour, then in 3, then switch to the next day.

Awful. I told them to cancel my return flight and they didn’t then charged me +$800 days before the flight for a biz class upgrade bid. When I called to confirm cancellation and get refund on buz class upgrade they said I had to go thru orbitz and it was too late. Scammers. Beware.

Little leg room in business. I am tall and could use more.

Was a cheap flight and it got me to Portugal on time. For economy there was ample leg room and the flight attendants were pleasant and helpful.

Flight was packed. This was a very uncomfortable experience. Boarding process could be explained better. Despite recommending a window seat when travelling with a pet in the cabin, the seat in front of me had less space than the center and aisle seats. For Premium Economy, the seats were crammed with minimal legroom. I hate to think what Regular Economy was like. The cabin crew missed me at first when handing out meals. When my meal eventually came, there were no utensils. I'd originally booked to fly Business Class; those seats didn't look that great either.

Flight was packed. This was a very uncomfortable experience. Boarding process could be explained better. Despite recommending a window seat when travelling with a pet in the cabin, the seat in front of me had less space than the center and aisle seats. For Premium Economy, the seats were crammed with minimal legroom. I hate to think what Regular Economy was like. The cabin crew missed me at first when handing out meals. When my meal eventually came, there were no utensils.

First time and I enjoyed the trip…. Will fly again soon 🔜

Delayed flight because other plane was occupying the gate for longer than expected. Once we boarded the plane had to wait 1 hour before taking off. We. Almost lost our connection flight and the baggage didn’t make it. We had to wait two days to receive our luggage. Hope they improve the timing or work with the airport to get better service.

I’m still missing my bags. I’m soo frustrated

TAP boarding gate agents singled out Group A line to gate check all carry on bags …. Supposedly because of lack on bin space. BUT ALL OTHERS WERE PERMITTED WITH CARRY ON BAGS. Additionally so many passengers entering the plane after us were permitted carry on bags. And when the plane was fully loaded, there was a number of open spaces in the overhead bins. I WILL SEARCH OTHER OPTIONS BEFORE FLYING TAP AGAIN

Boarding went fast. Lisbon's gates are too small for the flights they serve.

Too much long line at the TSA and Security. Prepare for long walk for baggage claim.

The flight from Seattle was delayed, which made me miss my connection to Florence. I was re-booked NINE HOURS LATER!!! That’s basically a vacation day lost. British Airways needs to partner with other airlines when possible to get a more realistic travel time, if delays occur. I realize there aren’t many flights to Florence from London, so I would book differently were I to return. The actual flight from Seattle was very comfortable and the crew was great, no faults there. I enjoy British Airways, this was an anomaly.

The crew could not have been more helpful, my meal was excellent, I slept peacefully until right before landing, and the BA lounge was a godsend. The only negative I encountered was the coffee both on the plane and in the lounge. Not to my taste but that’s a personal preference.

I don’t understand why a reputable airline like BA would delegate their London flights to AA. Makes no sense to me, as most domestic carriers do such a poor job these days. Terminal 3 at LHR is a total dump

The boarding process was quite loud and chaotic. The flight attendants kept barking over the PA system about people needing to only stow large items in the overhead bins. During the one and only service, I was hit by the service cart. At the same time, a passenger was returning from the bathroom and the crew definitely saw him but stopped a few seats short of allowing him to sit down before starting service and made him wait a good 10 minutes before passing his seat and allowing him to sit down, after which he had to ask for his snack and beverage or he would have been passed over. Neither flight attendant thanked passengers as they left; in fact, I did not see them again once the plane door was opened.

Cancelled flight minutes before boarding. Rescheduled flight was two days later

The flight attendants were EXTREMELY personable and appreciated the service, lights going off after dinner (probably the norm, but I haven’t flown evening overnight flights in a while). Thank you!

Business class seats were very dated on my plane. Very little storage, charging ports were not easily accessible, tv screen kept flopping away. Vegetarian food was disappointing: hardly any protein and severely under-seasoned. Crew was lovely.

The food was ok, but not great. They delayed boarding in Portland and did not enforce group boarding. But the crew was excellent, went above and beyond.

The food was pathetic. There wasn't much leg room and recline space for such a long flight. No tea/ coffee for a 2-3 hour connecting flight without purchasing! Really!?

Everything you need to know for your flight to Sines

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