$438 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 3/24. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Portugal

Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Boise to Portugal

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Lisbon
Lisbon2 stops$532
Porto
Porto2 stops$547
Lisbon
Lisbon2 stops$532
Porto
Porto2 stops$547

Book Cheap Boise to Portugal Plane Tickets

 
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

Thu, Nov 13 - Thu, Dec 4
Air Canada Logo
6:20 am - 9:20 amBOI-LIS
20h 00m2 stops
Air Canada Logo
10:55 am - 10:45 pmLIS-BOI
42h 50m2 stops
$532Air Canada
Find Deal
Mon, Dec 8 - Tue, Dec 16
United Airlines Logo
6:20 am - 10:15 amBOI-LIS
20h 55m2 stops
United Airlines Logo
11:20 am - 12:17 pmLIS-BOI
31h 57m2 stops
$536United Airlines
Find Deal
Wed, Nov 12 - Thu, Dec 4
Air Canada Logo
2:40 pm - 9:20 amBOI-LIS
35h 40m2 stops
Air Canada Logo
10:55 am - 10:45 pmLIS-BOI
42h 50m2 stops
$537Air Canada
Find Deal
Thu, Nov 13 - Fri, Dec 5
Air Canada Logo
6:20 am - 9:20 amBOI-LIS
20h 00m2 stops
Air Canada Logo
11:20 am - 11:44 pmLIS-BOI
43h 24m2 stops
$538Air Canada
Find Deal
Wed, Nov 12 - Fri, Dec 5
Multiple Airlines Logo
7:00 pm - 10:15 amBOI-LIS
32h 15m2 stops
Multiple Airlines Logo
11:20 am - 10:45 pmLIS-BOI
42h 25m2 stops
$543Multiple Airlines
Find Deal
Tue, Dec 2 - Wed, Dec 10
United Airlines Logo
1:50 pm - 8:55 amBOI-LIS
36h 05m2 stops
United Airlines Logo
11:00 am - 11:44 pmLIS-BOI
43h 44m2 stops
$545United Airlines
Find Deal
Tue, Nov 11 - Fri, Dec 5
Delta Logo
5:35 am - 11:20 amBOI-LIS
22h 45m2 stops
Delta Logo
5:00 am - 12:04 amLIS-BOI
26h 04m2 stops
$549Delta
Find Deal
Tue, Nov 11 - Sun, Dec 7
Delta Logo
9:00 am - 11:20 amBOI-LIS
19h 20m2 stops
Delta Logo
5:30 am - 10:16 pmLIS-BOI
23h 46m2 stops
$555Delta
Find Deal
Sat, Dec 6 - Wed, Dec 10
Scandinavian Airlines Logo
3:54 pm - 8:55 amBOI-LIS
34h 01m2 stops
Scandinavian Airlines Logo
7:05 am - 10:05 pmLIS-BOI
22h 00m2 stops
$598Scandinavian Airlines
Find Deal
Sat, Dec 6 - Wed, Dec 10
Scandinavian Airlines Logo
3:54 pm - 8:55 amBOI-LIS
34h 01m2 stops
Scandinavian Airlines Logo
7:05 am - 10:05 pmLIS-BOI
22h 00m2 stops
$688Scandinavian Airlines
Find Deal
Booking Insights

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 November, when tickets cost $670 (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.

Good to know

Low seasonDecember
Cheapest flight$438
Best time to beat the crowds but there is an average 26% increase in price.
Most popular time to fly with an average 7% increase in price.
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.

Reviews of the 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.
7.9
DeltaOverall score based on 7977 reviews
7.9Comfort
7.9Entertainment
8.5Crew
8.2Boarding
7.3Food
Airline reviews

Old plane and old configuration/seats but still comfortable for a morning flight

10.0 ExcellentBraulio, Oct 2025ATL - SDQ
Read more Delta reviews

Old plane and old configuration/seats but still comfortable for a morning flight

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

Flight was crowded and the woman sitting on my left was large & kept crouching in to my space. You need bigger seats or smaller passengers to fit into the seats you DO have! Snack were OK. Would appreciate if airlines had more savory rather than sweet snacks, thank you!

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

We were delayed, which I think had to do with air traffic control. Otherwise, everything was great.

The boarding process needs to be refined. Sometimes the gate crew calls out the zones and then flip to showing the.zones boarding on the gate monitor display. So, unless you are huddled around the gate lanes watching the monitor, you could miss your boarding zone. Suggest the zones be announced each time a new zone is allowed to board.

The boarding process needs to be refined. Sometimes the gate crew call out the boarding zone, and then flip to the monitor to show which zones are boarding. So unless everyone is gathered around to see the monitor there is usually confusion as wi which zones are boarding.

On time flight. Seat comfort could be better in the Comfort section.

My issue was with TSA agents for delta airlines. My luggage got flagged. The agent was going thru another persons first. He took 20 min to go thru hers. I asked them to bring mine closer so I could sit down . They said you can go sit it will be fine. I said I am supposed to keep my eyes on my bags at all times. The agent was meticulously unwrapping 2 gifts that the lady had and then tried to re warp it. He was trying to be kind i get it but 20 min for me to stand watching him do that was ridiculous. It was 6 am and there were a ton of travelers. Mine was flagged for some air packed tea that I bought in Turkey. My previous delta flight and 2 others before didn’t flag it. Consistency would be nice. Also on the flight the window shades were down for take off and landing - I thought that was very odd I thought they had to remain open for take off and landing.

My husband and I recently had an unfortunate experience with Lufthansa. At the Philadelphia International airport, the ground staff refused to board us because we didn’t have a current visa stamped on our passports for Frankfurt. We completely understand that this was our mistake. we should have double-checked the visa requirements before our trip. However, the issue that upset us most was how the situation was handled by the staff. They told us they would mark it as “boarding denied due to visa issue”, but instead they recorded it as “no show”. Because of that incorrect entry, our return flight was automatically cancelled as well, which caused additional stress and expense. Mistakes can happen, but we expected more transparency and accuracy from a reputed airline like Lufthansa. It would have made a big difference if the staff had been more careful and considerate in documenting the situation correctly.

Flight was good but there are way to many announcements for credit cards etc.

During booking, I kept trying submitting my payment from the Mexican website and it didn't work. After I had the idea to change it to the Canadian website, it worked but I had to be charged the equivalent of 50 CAD more. I received the clear instruction that I would only be able to check-in at the airport and that it was impossible to select a seat 24 hours before departure, that I had to pay 144 CAD to do so, although not only was I able to check-in 24 hours before departure, but I could have selected my seats for free then. All in all, I almost threw $200 out the window due to misleading information. Besides, the app kept crashing, the information to get to the gate on the app was inaccurate, my gate was switched and I was only informed once in the air (luckily I had noticed the departure pannel), I was not addressed in my language beforehand and even if I tried I was immediately answered in English (which meant the crew understood but didn't want to answer accordingly), there was only one snack & beverage service on my medium haul flight and no beverage service on my short haul flight. To be fair, the planes were comfortable, the crew apart from the language issue was helpful, dynamic and engaging, the plane was clean and the directions were clear and direct. United has a lot of potential to be one of my favourite airlines, but the devil is in the details and a lot of them missed the target.

Flight was timely, relatively comfortable, with decent entertainment and food served. Only problem encountered was with the free messaging which I highly appreciate, but it did not work from iphone to non-iphones.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

The entertainment available didn’t work for anyone on the flight. Long 6 hr flight with no entertainment option and the staff didn’t know until an hour into the flight when we made sure they knew about it. They had no way to fix it.

Crew seemed a bit cranky. No seatback screens. But boarding was efficient and on time and we arrived early.

The worst landing I have ever had on a domestic flight. Thought we would lose the landing gear on landing in Newark. Then we spent 40 minutes trying to position the plane in the right place to be able to get the jet way to the plane. The plane arrived stopped. The announcer was that we were there. Everybody got up, then we were told to sit back down because they had to have us towed to a different position. We got towed and then everyone stood up and they told us we were in the wrong position to sit back down again, and then we got towed to a different position This did not happen immediately. It was 30 minutes while we wandered around a small section of the tarmac in Newark close to the gate, but apparently not close enough. Horrifying experience The CAB should be investigating that flight

Food was poorly timed and not good.. Hand held snacks, really. I kept asking for water and never got any. Service was rushed for a 7-hour flight.

Boarding was organized. Old plane. Seat fairly comfortable. Business Class much too large so you don’t receive as much attention as you should considering what you pay for the seat.

A couple ladies from the crew were so rude and nasty. Thought they were mad at having to be there especially if you asked a question. This will make me think twice next time if I book a flight with you.

Delays to take off and to leave the plane after landing added a lot of time to this flight.

Poor seat in rear of aircraft Food at Admiral’s Club Terminal D at DFW inedible

Always seated jammed in rear of aircraft Admirals Club food at DFW terminal D was absolute worst food experience and I pay $600/year to eat this dried out junk

Flight was delayed because of a bird strike. They had another plane available within 45 minutes.

Mostly good. Flight was crowded but Airline personnel were very friendly & accommodating. It would be good to have savory snacks rather than just sweet Biscoff cookies.

It was a typical flight. We had a delay which seems to be the normality now. And we had no in flight service due to conditions.

Flight attendants on this flight were very attentive and friendly

After we landed we sat on the tarmac for 1.5 hours waiting to get to our gate. Ridiculous.

Food should be better quality. Video screens have poor resolution and the library of movies is poor. The other airlines are much better.

Plane left an hour late, I missed my connection and my bow case was never even loaded on the plane in VA. I deal with this type of nonsense everytime I fly air canada.

For goodness sake, board from the back of the plane to the front and assign overhead space. It would fix everything. Seriously.

Elderly female flight attendant was not customer friendly. There were only about 12 people on a regional jet that had about 60 seats. There were 8 exit row seats and none of them were taken. We attempted to sit in those seats and the flight attendant gave the standard " you didn't pay for those" so she would not allow us to move. What harm would that have caused ? They assigned seats to 5 of the 12 people in 2 rows, row 20 and 21. A simple friendly customer experience gesture of allowing us to sit in exit rows would have gone a long way in me having a very favorable impression on Air Canada. After that I have very poor impression of Air Canada and will not fly with them when I can avoid it.

It was a smooth flight both in the sky and landing!

Pearson Airport could not properly handle all the passengers who they needed to process in order to properly get them on board. As a result, I missed the departure of my flight from Toronto. The only saving grace is that Air Canada found a flight that only delayed me by one hour. However, this was no thanks to Pearson Airport!

Almost everything it was a “cool” ambiance but we arrived to Toronto so that it’s ok for me

The crew was really nice. The plane seats were kinda small even for a 5’6” / 158 lbs person.

Fare was great, seat comfort the opposite as cushion was worn out. Ok for 2 hour flight, not for 4.5 hour flight..

Check in agent was very helpful and polite. He helped me board the earlier flight back home instead of waiting 2 hours at the airport for the next flight

Fair. What's the point of partnering with United if we cannot use the lounge. My wife is a frequent flier with United but we were refused access to Air Canada lounge

Everything you need to know for your flight from Boise to Portugal

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.