$508 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 9/14. 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

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 24% 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$834
Porto
Porto2 stops$895
Lisbon
Lisbon2 stops$834
Porto
Porto2 stops$895

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, Aug 19 - Wed, Aug 26
United Airlines Logo
5:00 am - 9:20 am
BOI
-
LIS
21h 20m
2 stops
United Airlines Logo
11:25 am - 11:50 pm
LIS
-
BOI
43h 25m
2 stops
$834United Airlines
Wed, Aug 19 - Wed, Aug 26
Multiple Airlines Logo
10:37 am - 11:05 am
BOI
-
LIS
17h 28m
3 stops
Multiple Airlines Logo
12:55 pm - 9:35 am
LIS
-
BOI
27h 40m
2 stops
$871Multiple Airlines
Thu, Oct 15 - Sat, Oct 24
Delta Logo
2:35 pm - 5:50 pm
BOI
-
LIS
20h 15m
2 stops
Delta Logo
5:00 am - 8:17 pm
LIS
-
BOI
22h 17m
2 stops
$898Delta
Thu, Oct 15 - Sat, Oct 24
Delta Logo
10:38 am - 5:50 pm
BOI
-
LIS
24h 12m
2 stops
Delta Logo
5:35 am - 11:08 pm
LIS
-
BOI
24h 33m
2 stops
$906Delta
Mon, Jul 27 - Wed, Aug 5
United Airlines Logo
7:05 pm - 10:30 am
BOI
-
LIS
32h 25m
2 stops
United Airlines Logo
12:55 pm - 11:32 am
LIS
-
BOI
53h 37m
2 stops
$954United Airlines
Sat, Oct 10 - Thu, Oct 22
Multiple Airlines Logo
10:37 am - 11:05 am
BOI
-
LIS
17h 28m
3 stops
Multiple Airlines Logo
11:25 am - 9:35 am
LIS
-
BOI
29h 10m
2 stops
$955Multiple Airlines
Sat, Oct 10 - Thu, Oct 22
Air Canada Logo
10:37 am - 11:05 am
BOI
-
LIS
17h 28m
3 stops
Air Canada Logo
11:25 am - 9:35 am
LIS
-
BOI
29h 10m
3 stops
$958Air Canada
Sat, Aug 1 - Thu, Aug 6
Air Canada Logo
7:05 pm - 9:20 am
BOI
-
LIS
31h 15m
2 stops
Air Canada Logo
1:00 pm - 9:29 pm
LIS
-
BOI
39h 29m
2 stops
$974Air Canada
Tue, Sep 15 - Sat, Sep 26
Multiple Airlines Logo
3:25 pm - 2:55 pm
BOI
-
LIS
16h 30m
2 stops
Multiple Airlines Logo
5:00 am - 8:18 pm
LIS
-
BOI
22h 18m
2 stops
$977Multiple Airlines
Tue, Sep 8 - Sat, Sep 19
United Airlines Logo
7:05 am - 8:20 am
BOI
-
LIS
42h 15m
2 stops
United Airlines Logo
11:25 am - 9:35 am
LIS
-
BOI
53h 10m
2 stops
$986United Airlines
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 January, when tickets cost $0 (return) on average. On the other hand, the most expensive months are July and September, when the average cost of round-trip tickets is $923 and $915 respectively.

Good to know

Low seasonFebruary
Cheapest flight$508
Best time to beat the crowds with an average 16% drop in price.
Most popular time to fly and prices are also 41% 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.

Reviews of the top airlines flying 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 8460 reviews
8.5Crew
7.8Entertainment
7.9Comfort
7.2Food
8.1Boarding
Airline reviews

Seats in Delta Main are unbelievably close to the seat in front of. Hard to get a backpack under the seat.

8.0 ExcellentMatthew, May 2026
OKC - ATL
Read more Delta reviews

Seats in Delta Main are unbelievably close to the seat in front of. Hard to get a backpack under the seat.

The flight was operated by Latam. The aircraft had a technical issue and the flight was delayed for the next day. They grounded other passengers to get their airplane assigned to my flight. Most of he ground staff don't speak English (Orlando Airport), but were very polite.The crew on the other hand could speak English and Portuguese. On board service was good.

The agent at check in and at the gate were less than thrilled to be at work. I'm not a fan of Kayak's placement on the plane. I got put in the middle seat and none of my preferences were used.

In ATL they have two sets of departure screens. Follow what is on your airline's departure board - the ATL Airport Authority departure board had completely incorrect details about the gate assignment for my flight, which would have made me miss boarding.

Flight was delayed it was hot while sitting on the plane, one engine was working on the plane until they had to do some jimmy rigging down the runway in order for the other engine to charge up. It was ridiculous

The flight was very good and the staff was very friendly and helpful!

The only thing I would say is we tried to get on a standby earlier flight, but with our fair we couldn’t. That seems senseless to leave with open seats..

Very easy to use and convenient, you can perform any action within the same portal

In a world of delays, Delta was on time both ways! Boarding was fast and efficient. Staff was friendly. AND wifi worked.

WiFi didn’t work. Flight delayed 3 hours Crew members were illiterate Seat lean back did not work.

Cree was organized and pleasant. Plane had good seating but as it’s a shuttle toilets hadn’t been thoroughly cleaned (eg. bins too full)

I liked that my son and I were reseated next to each other (we had different bookings). I liked that it was a directg flight and mostly on time. I liked that you provided pillows and blankets. Flight attendants were generally courteous. The messaging through wifi did not work well. The food was not good. Seats are very narrow and I felt slightly claustraphobic in the window seat.

Overall a good experience, but no wifi available for free or for purchase and we got wet from condensation or other water source during descent.

Some crew were unfriendly or in some cases just straight up rude.

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

A long delay. Don't travel late in the day.

Super friendly with lots of drink options an entertainment. Friendly crew.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

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

Information on your arrival and departure airports