$329 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 1/2. 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, 0 bags

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Cheap Flights from Boise to Portugal

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Lisbon
Lisbon2 stops$494
Porto
Porto2 stops$478
Lisbon
Lisbon2 stops$494
Porto
Porto2 stops$478

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

Wed, Feb 4 - Fri, Feb 13
United Airlines Logo
7:05 pm - 7:55 am
BOI
-
LIS
29h 50m2 stops
United Airlines Logo
10:55 am - 9:32 pm
LIS
-
BOI
41h 37m2 stops
$494United Airlines
Fri, Jan 23 - Fri, Jan 30
United Airlines Logo
6:10 am - 8:10 am
BOI
-
LIS
19h 00m2 stops
United Airlines Logo
11:20 am - 7:51 pm
LIS
-
BOI
39h 31m2 stops
$495United Airlines
Fri, Jan 23 - Fri, Jan 30
Air Canada Logo
6:10 am - 9:20 am
BOI
-
LIS
20h 10m2 stops
Air Canada Logo
11:20 am - 1:35 pm
LIS
-
BOI
33h 15m2 stops
$497Air Canada
Wed, Feb 11 - Wed, Feb 18
United Airlines Logo
8:10 am - 11:30 pm
BOI
-
LIS
32h 20m2 stops
United Airlines Logo
11:20 am - 9:32 pm
LIS
-
BOI
41h 12m2 stops
$498United Airlines
Fri, Jan 23 - Tue, Jan 27
United Airlines Logo
8:15 am - 8:10 am
BOI
-
LIS
16h 55m2 stops
United Airlines Logo
5:00 am - 9:52 pm
LIS
-
BOI
23h 52m2 stops
$499United Airlines
Sat, Apr 11 - Tue, Apr 21
Delta Logo
5:30 am - 10:45 am
BOI
-
LIS
22h 15m2 stops
Delta Logo
5:00 am - 4:15 pm
LIS
-
BOI
18h 15m2 stops
$500Delta
Fri, Jan 23 - Tue, Jan 27
Delta Logo
9:15 am - 3:10 pm
BOI
-
LIS
22h 55m2 stops
Delta Logo
5:00 am - 6:28 pm
LIS
-
BOI
20h 28m2 stops
$501Delta
Sat, Apr 18 - Thu, Apr 30
Delta Logo
1:51 pm - 6:45 pm
BOI
-
LIS
21h 54m2 stops
Delta Logo
5:00 am - 9:25 pm
LIS
-
BOI
23h 25m2 stops
$505Delta
Wed, Apr 15 - Mon, Apr 27
Delta Logo
11:36 pm - 8:00 am
BOI
-
LIS
25h 24m2 stops
Delta Logo
5:35 am - 9:25 pm
LIS
-
BOI
22h 50m2 stops
$507Delta
Mon, Apr 20 - Sat, May 2
Delta Logo
11:36 pm - 8:00 am
BOI
-
LIS
25h 24m2 stops
Delta Logo
10:00 am - 10:10 pm
LIS
-
BOI
19h 10m2 stops
$511Delta
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 $642 (return) on average. On the other hand, the most expensive months are December and June, when the average cost of round-trip tickets is $2,678 and $1,449 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 seasonJanuary
Cheapest flight$324
Best time to beat the crowds with an average 22% drop in price.
Most popular time to fly with an average 2% 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.

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 8016 reviews
7.9Comfort
7.9Entertainment
8.1Boarding
8.5Crew
7.3Food
Airline reviews

The gate attendants and the crew were terrible. Because of high winds, they needed to carry more fuel, so they had to get volunteers to take the next flight at 6 am the next day. They did a terrible job of it - our flight ended up taking off just under 3 hours of the scheduled time. I hope to never fly Delta again.

2.0 MediocreBarbara, Dec 2025
PHL - MSP
Read more Delta reviews

The gate attendants and the crew were terrible. Because of high winds, they needed to carry more fuel, so they had to get volunteers to take the next flight at 6 am the next day. They did a terrible job of it - our flight ended up taking off just under 3 hours of the scheduled time. I hope to never fly Delta again.

Did not realize internet screen was hidden between seats and no info printed!!!!

2 of the seats in row 31 the entertainment system was not working, and one seat the tray table did not go all the way down. Flight arrived early and departed on time which was great.

Very good flight crew and very nice people staff were incredible especially the gate agent

Waited at the usual crowded gate at DCA where one ends up standing up because there aren't enough seats.

The flight was delayed for about 2 hrs. Other than it, it was good.

Advertised fruit trays with cheese, but only snacks handed out!

The plant way delayed departing by 3 hours. It was an old airplane with broken seats and armrests. The bathroom made a hollering sound. A really crappy flight experience and travel day all around.

Flight delays both to Detroits and return flight . The flight to Detroit was associated with mechanical difficulty

I am extremely disappointed that delta internal pilot manuals now refer to the Gulf of Mexico as the “gulf of America”. You can bow down to the Orange turd on your own. I will never fly delta again

I boarded flight UA#1318 at Sacramento International Airport going back to Houston TX. The flight was scheduled at 5:10am. I was able to check in virtually using the United Airlines app. When I entered the airport, there was no one outside assisting with checked bags as it was for Delta Airlines. Immediately upon entering, there was a LONG, EXTREMELY LONG line to the kiosks to get boarding passes. I stand in line to get boarding passes then had to move to ANOTHER EXTREMELY LONG line to get my bags checked in. While standing in this line, we noticed an agent taking customers to 3 at a time to her station to check their bags in. Lucky for me, she called me back, checked my bags for me and I was on my way. I then encountered another long line at the TSA check and to avoid I ending up having to sign up for CLEAR to bypass it. So glad, I did.,...Both of my flights were great with no issues, butthe check in progress at Bush Airport was so much smoother. Check-in at SMF airport needs to be anaylzed and corrected. Do better United, I know you can....thanks

cabin crew was OK, food was OK, the trip from the US to Munich was actually pretty bad comfort wise. Noisy aircraft, lights never dimmed even in Business class (night flight) barely sufficient amenities for the price. I have millions of miles with United but TBH American is gaining ground and Delta has always been marginally better then United although on paper United has more longes and cheaper upgrades.

Pushed back only to get deplaned due to a tire damaged by ground crew. They did at least go pretty fast. The bathrooms should be banned under the Geneva convention. No room to even sit straight on the toilet. The under-seat entertainment units block what little leg room there is.

Essy to get on. The hostess gave very little pop, the plane was late getting in, and we are still waiting for our bags. This sucks. :/

Sat next to a one year old. She crawled all over the place and made me laugh.

Not United Airlines' fault. It's ORL airport's fault.

Great flight. On time boarding. Smooth flight and on time arrival at EWR. The flight crew was marvelous and there was a great selection of movies on the entertainment system. Our bags were at the carousel before we got there. Another excellent flight from United.

United airlines has the best customer experience from booking to arrival. I always fly United airlines. The mileage program is excellent

They did the one thing that really matters - got to Chicago early.

I liked the snacks and the flight attendants were friendly.

We were 4+ hours delayed. AA is absolutely obnoxious. They just kept pushing back the time to the point where we did not get into Vegas until after midnight when we were supposed to arrive like 845pm.

My last flight on 25 Dec, it’s Christmas Day, everyone happy and very good mood. I really enjoy traveling with Americans Airlines from Miami to Minneapolis my home town after long flight from lhe to Doha then Miami. Thank you again to make my travels comfortable and relaxed. Best regards

The boarding process needs to be fixed. The zone don't work, especially when there is hardly anyone in zones 3, 4,and 5, leaving the majority of the passengers backed up in the aisle, especially because passengers seated near the front are blocking passengers who are seated in the rear of the plane. It would also help if the size of carry on bags was more strictly enforced.

I requested a low sodium meal. Reason being, I take medicine for high blood pressure and I wear compression socks on long flights to help with leg swelling. Having less sodium in meals really helps me feel better on long flights. I received my initial low sodium meal after takeoff. Just before landing, the crew came through with the meal cart and offered me what was being served. I said no thank you and then noticed my low sodium meal in the meal cart, with my name and seat assignment on it. I motioned to the crew member, but he grabbed the meal cart and proceeded to move to the rear of the aircraft. He didn’t see me or other passengers who had attempted to get this attention. He was more concerned about completing meal service since we were due to land in under 45 minutes. I pressed the call light five times from my seat to receive help, but no crew member responded to me. So, I didn’t receive a second meal, one that I requested (the low sodium option). This led me to have a migraine from only eating one meal on an 11-hour flight. This is why I’m not a fan of flying US-based airlines overseas. The crew members continue to show the absolute worst customer service experience. I would not recommend flying American for overseas flights.

WiFi didn’t work the entire flight. Very disappointing. Minimal food and options - sadly the state of current affairs. All other aspects of the flight were fine.

Great flight - friendly and attentive team! Seats in coach were comfy, but a little cramped - but that is the case with all airlines ;)

The boarding by groups is pointless. The first two groups worked fine, but almost Noone boarded in goups three thru five leaving the vast majority boarding when group six was called. It defeated the purpose of spreading out the crowd.

I don’t know who decides what food to serve on these flights but I would be so embarrassed if I served this to anyone and call it food…

For whatever reason, the flight was not catered -we were told it would be a 45 minute delay waiting for catering - so no food. There were opened candy and peanuts in the seatback pocket. Flight landed early in DFW but due to the assigned gate not being available, we sat on the ground for 30 minutes waiting for the gate to open - making the flight actually arrive at the gate late.

Not great. Booked Extra seats and got nothing extra at all. It’s basically a big budget airline.

Couldn't fit knees, only 1 toilet working, didn't get anything to drink cause the stewards were not able to get to us

Flight was canceled for a reason they knew hours before but did not mention. Next the gate chnage from 37 to 38 at least 10 times. Ridiculous.

The flight from SFO to YVR was delayed and my bag did not make it to my next flight from YVR to SYD. It took almost 3 days after I landed to get my bag and when I got it, it was filled with dust

Our biggest complaint about Air Canada is that if you don’t like your seat during check-in, there’s a fee to move elsewhere. On our flight from YUL to FFL, we were charged to change seats—just regular seats. What’s maddening is that the plane wasn’t even full; there were even a few people sleeping in the middle row sections (entire rows, completely empty), using them as beds. In my opinion, charging passengers for seat changes is a cash grab by Air Canada. They are definitely not the airline they were back in the day. I suppose they need to gouge the consumer now that they pay their attendants while on ground. One out of 10.

Nothing specific. Cabin temperature was too high for some reason.

It was just fine. I managed to make all my connection too sbut had trouble in Munich with no wheel chair and trouble trying to get help from the airport people to get to the other terminal for my flight. Finally a wonderful lady Amelia, helped me to make my flight connection Timon with zero time to spare.

Over 40 years ago my AC return flight was canceled, during this last summer the same thing happened. AC denied everything Canadian like paying for accommodations and basic necessities. So why would I ever want to fly AC again? This last flight my wife took the return flight had problems and left late, so I guess they are getting better. However I have no faith in this airline so I drove to this last destination! I'll never fly AC again!!!

Great check in process in LA and good service The check in process as well as at the gate is way better in the US versus canada 🇨🇦

Super experience. Earlier than schedule departure and arrival. Baggage handling was very good

Allow me to book extra bag check in as free though I packed in 1 luggage but that was 7 LBS overweight so make another bag to free check in.

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

Information on your arrival and departure airports