$399 Find Cheap Flights from Boise to Portugal

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boise to Portugal departing on 10/7. 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.
1 adult
1 adult, Economy

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Best Portugal Flight Deals from Boise

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Lisbon
Lisbon2 stops$586
Porto
Porto2 stops$643
Lisbon
Lisbon2 stops$586
Porto
Porto2 stops$643

Cheap Flights from Boise to Portugal

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boise to Portugal 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.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Boise to Portugal

Tue, Nov 4 - Tue, Nov 18
United Airlines Logo
6:15 am - 8:10 amBOI-LIS
18h 55m2 stops
United Airlines Logo
11:00 am - 11:39 amLIS-BOI
31h 39m2 stops
$586United Airlines
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Wed, Nov 5 - Tue, Nov 18
United Airlines Logo
2:31 pm - 2:50 pmBOI-LIS
17h 19m2 stops
United Airlines Logo
11:00 am - 10:55 pmLIS-BOI
18h 55m2 stops
$630United Airlines
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Thu, Nov 6 - Tue, Nov 18
Air Canada Logo
5:00 am - 9:20 amBOI-LIS
21h 20m2 stops
Air Canada Logo
11:00 am - 10:55 pmLIS-BOI
42h 55m2 stops
$631Air Canada
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Wed, Nov 5 - Mon, Nov 17
Lufthansa Logo
2:31 pm - 2:50 pmBOI-LIS
17h 19m2 stops
Lufthansa Logo
3:55 pm - 9:21 pmLIS-BOI
36h 26m2 stops
$642Lufthansa
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Sun, Oct 26 - Mon, Nov 10
United Airlines Logo
6:20 am - 10:15 amBOI-LIS
21h 55m2 stops
United Airlines Logo
5:00 am - 6:09 pmLIS-BOI
20h 09m2 stops
$651United Airlines
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Thu, Nov 6 - Mon, Nov 17
Iberia Logo
7:21 am - 7:40 amBOI-LIS
17h 19m2 stops
Iberia Logo
8:45 pm - 12:33 pmLIS-BOI
22h 48m2 stops
$703Iberia
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Tue, Nov 4 - Sun, Nov 16
Delta Logo
5:40 am - 9:00 amBOI-LIS
20h 20m2 stops
Delta Logo
11:15 am - 12:17 amLIS-BOI
20h 02m2 stops
$821Delta
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Tue, Jul 8 - Wed, Jul 16
Air Canada Logo
10:50 am - 9:20 amBOI-LIS
39h 30m2 stops
Air Canada Logo
11:25 am - 11:31 pmLIS-BOI
43h 06m2 stops
$877Air Canada
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Fri, Jul 11 - Fri, Jul 18
Iberia Logo
7:16 am - 11:25 pmBOI-LIS
33h 09m2 stops
Iberia Logo
8:25 am - 11:16 pmLIS-BOI
21h 51m2 stops
$965Iberia
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Fri, Jul 11 - Thu, Jul 17
Lufthansa Logo
10:45 am - 9:50 pmBOI-LIS
28h 05m2 stops
Lufthansa Logo
12:15 pm - 9:34 pmLIS-BOI
40h 19m2 stops
$988Lufthansa
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Useful Info

KAYAK's insights & trends for Boise to Portugal flights

Get data-powered insights and trends into flights from Boise to Portugal to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Boise to Portugal?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Boise to Portugal, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Boise to Portugal is February, when tickets cost $726 (return) on average. On the other hand, the most expensive months are June and December, when the average cost of round-trip tickets is $1,453 and $1,331 respectively.

What’s the cheapest day of the week to fly from Boise to Portugal?

The average price of all round-trip flights from Boise to Portugal clicked on KAYAK for each day over the last 12 months.

When flying from Boise to Portugal, you should consider leaving on a Wednesday and avoid Saturdays if you are looking for the best rates. For your return to Boise, you’ll find the best rates on Wednesdays and the most expensive ones on Tuesdays.

How far in advance should I book a flight from Boise to Portugal?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Boise to Portugal, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Boise to Portugal, you should book around 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 7 weeks before departure.


Good to know

Low seasonDecember
High seasonApril
Cheapest flight$399
Best time to beat the crowds but there is an average 25% increase in price.
Most popular time to fly and prices are also 1% lower on average.
Flight from Boise to Lisbon

FAQs - booking Portugal flights

  • How does KAYAK find such low prices on flights from Boise to Portugal?

    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 from Boise to Portugal.

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

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

  • What is the Hacker Fare option on flights from Boise to Portugal?

    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 from Boise to Portugal 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 from Boise to Portugal?

    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 from Boise to Portugal up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Portugal?

    The cheapest time of day to fly to Portugal is generally in the evening, when round-trip flights cost $1,071 on average. Morning departures are around 8% more expensive than evening flights, on average. The most expensive time of day to fly to Portugal is generally at night, which is peak travel time and where the average cost of a ticket is $1,393.

Top 4 airlines serving from Boise to Portugal

 
Need help choosing which airline to fly with from Boise to Portugal? 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 7946 reviews
8.5Crew
8.2Boarding
7.9Comfort
7.3Food
7.9Entertainment
Airline reviews

Great service. Flight was delayed while we sat on the runway for a couple of hours. Weather related. Staff made is very bearable. The steward servicing the first class cabin was exceptional. Thank you! 💗

10.0 ExcellentHartaj, Jun 2025EWR - RDU
Read more Delta reviews

Great service. Flight was delayed while we sat on the runway for a couple of hours. Weather related. Staff made is very bearable. The steward servicing the first class cabin was exceptional. Thank you! 💗

5 hours of delay that could've been much shorter if Delta had taken the 1 hour delay they imposed on the flight before boarding to run any of the plane checks required for flight to find the hydraulic issue that required nearly 3 hours to fix. $24 of meal credit buys a sandwich and a soft drink. Poor communication within the terminal about what gate we'd be re-boarding from and when we'd be re-boarding.

Great flight! Only complaint I had was that I didn’t get breakfast that morning because I don’t eat eggs for breakfast.. I ate an energy bar I bought in the airport which I had never done before. Otherwise, another great Delta flight!

Amazing flight! I have never noticed the uniforms of the attendants before in twenty years of flying except today when one female had the most amazing dress on. It was beautifully designed and showed she was in charge. I never dreamed I would google who designed Delta uniforms . The ultimate compliment is when another woman admires your outfit. . I hope your designer puts it on the market

It would be nice if was given wires ear buds. Overall was a good experience was able to sleep on the plane

My flight was 6 pm 6/6. Every hour they delayed it again - air condition issues then no pilot then the crew had worked too many hours and cancelled the flight at 11 pm. Sent customers to NJ a 45 minutes uber ride to a hotel. Had to be back by 5 am for a 7 am flight and again no pilot etc with another three hours of delays.

The entertainment and wifi mostly didn't work on this flight.

Terrible entertainment system - kept freezing and audio kept cutting out. Snacks were mediocre at best for a 5 hour flight.

The check in and bag drop off for Sky Priority members is slow. The Clear security was also slow - a TSA issue.

I am still upset that my bag was lost on a recent trip to Rome ; we were inconvenienced and out €150 Euros ; delta has refused to reimburse us

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

It was fine, definitely older planes with no charging or anything. There’s no entertainment set up on board, but it is nice that they allow you to access the in flight entertainment from your phone without having to pay for the Wi-Fi and they do offer free texting.

Terrible. Out flight was delayed for 21 (twenty one) hours. United is a joke.

Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.

Impressed with the service despite turbulence because of the weather. Both flights arrived before their scheduled times.

Very comfortable (upgraded to business class). The audio on my screen didn’t work, but I managed to play the audio through my phone while watching the screen.

The food was the worst I’ve had on any flight I’ve ever been on.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

I was supposed to be on business class at first class from Denver back to Miami due to weather changes. I missed my connection and it’s put on a flight to Fort Lauderdale. Instead of honoring my business class/1st class ticket, they put me in coach, but there were two first class seats open. I think it’s absolutely disgusting that I paid for first class $1300 ticket and they put me in economy and they had to open seats available and I have still not been refunded the difference. I ended up having to eat a snack box instead of the meal I was supposed to get and did not get home till 2 AM so I think that’s a little pathetic that I had to live off crackers for dinner And my poor dog ate some cheese and salami. Oh yes, apparently when they switched me to the new flight they forgot to mention I had a service dog

Excellent service despite turbulence during the flight. Flight attendants were remarkable!

It was one of my worst flight ever. First they were changing the gate for at least 4 times, changing from gate D7 to D12 to D44. Considering the size of the Miami Airport, we are talking about long distance and the train at the airport was not working. Then the flight was delayed around one hour. Then finally we boarded into the plane and when everybody was seated, there was an announcement that there is an issue with one of the tire of the plane, so we all had to get out of the plane with our belongings, to replace the tire. So we had around 2.5-hour delay

Most miserable flight ever. We waited almost 2 hours on the runway because the flight was oversold. American offered $1200 credit. Then there was some nonsense about weight distribution. Ridiculous. No food for 8 plus hours on the flight. I will be writing a letter.

Honestly, I haven’t flown American in years, probably due to the pandemic and my being unable to travel for certain periods in the last two years, but it was a good experience to dig out or obtain a new American Airlines account after many years of traveling for business with American in the past.

The plane was probably full boarding was easy. We were able to check our carry-on luggage for free. It was a return flight through Philly to LA. Never saw a stewardess do a demonstration of emergency Procedures. I think my flight was pretty full

Plane, flight, crew, captain were all great. The first flight had a Chipotle box lunch...delicious.

Plane, flight, crew, captain were all great. The first flight had a Chipotle box lunch...delicious. this return flight not as tasty, but filling.

The flight was 2 hour delayed, otherwise everything was excellent. The delay was due to the hourly limit requirement so given that as a reason, I'm happy with the flight!

Weather delay for 2.5 hours followed by half hour crew delay, did not have ginger ale, uncomfortable seats

Flight was full, and would have preferred an aisle seat, but due to getting a late ticket ,the seat I had was adequate. The flight crew were very help full and hard working. Food and drink were excellent for the 11hr flight. Overall I was pleased with flight, and would recommend British Airways again.

So awful Unreliable Unfriendly Bad Mad Mean Smelly Hot Late Overbooked Understaffed Expensive Cramped Narcs If they were a fruit they’d be rotten durian

Flight was delayed but the real issue is how long we sat after boarding. Space very limited for an overnight flight and seatbacks didn’t recline so it was almost impossible to sleep.

The staff made sure I was comfortable, moved me to a better seat with more leg room

Easy boarding and comfortable seating were plusses. Enjoyed the experience and good service from the captain and crew. Many thanks...!

Somehow, my booking was under my preferred name instead of my legal name so they almost didn’t let me board the plane at LAX. This problem should have been notified to me when I was still in Toronto.

Great overall. Quick boarding, attentive staff - great experience in premium class.

When arriving over 2 hours early to check k in at Charlotte airport I was told I would have to check my carry on ? Apparently the flight was full and may not be room. I was not given a choice and the agent was quite unpleasant about it. I am a senior amd was not comfortable me having to worry about my bag being lost vut it didn’t seem to bother him. There were lots and lots of people of all ages in line when we boarded with carryons and most larger than mine .the rest of my journey was pleasant vut this was totally unacceptable.

The layover was 6 PLUS hours and we were only given a $15.00 voucher. We missed our first activity in Quebec due to the delay.

Miserable staff as it was a late/delayed flight and crew wasn’t in the best spirits. Completely understood as neither was most of the passengers. Still unacceptable l.

Or the greatest and it ended up picking us up from Chicago to Toronto not sure who was tesponsible for the 4 hr delay. United should have been properly prepared for a scheduled flight from Austin to Chicago and they were not.

It was a short flight, and no entertainment. That was not a problem for us, but there is no option for "not applicable". There was a bit of turbulence, so there was no food service.

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