$461 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 9/15. 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$727
Porto
Porto2 stops$895
Lisbon
Lisbon2 stops$727
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

Mon, Nov 2 - Thu, Nov 5
United Airlines Logo
7:00 am - 10:15 am
BOI
-
LIS
20h 15m
2 stops
United Airlines Logo
1:00 pm - 9:15 pm
LIS
-
BOI
39h 15m
2 stops
$727United Airlines
Mon, Nov 16 - Thu, Nov 19
United Airlines Logo
7:00 am - 8:10 am
BOI
-
LIS
18h 10m
2 stops
United Airlines Logo
10:15 am - 9:16 pm
LIS
-
BOI
18h 01m
2 stops
$743United Airlines
Tue, Nov 3 - Wed, Nov 11
Multiple Airlines Logo
10:39 am - 11:00 am
BOI
-
LIS
17h 21m
3 stops
Multiple Airlines Logo
11:20 am - 9:43 am
LIS
-
BOI
29h 23m
2 stops
$754Multiple Airlines
Tue, Sep 8 - Sat, Sep 19
Scandinavian Airlines Logo
12:42 pm - 11:15 pm
BOI
-
LIS
27h 33m
2 stops
Scandinavian Airlines Logo
10:55 pm - 8:18 pm
LIS
-
BOI
28h 23m
2 stops
$769Scandinavian Airlines
Tue, Oct 20 - Fri, Oct 30
United Airlines Logo
5:00 am - 9:20 am
BOI
-
LIS
21h 20m
2 stops
United Airlines Logo
1:00 pm - 11:05 pm
LIS
-
BOI
40h 05m
2 stops
$782United Airlines
Wed, Oct 21 - Wed, Oct 28
Delta Logo
4:05 pm - 5:50 pm
BOI
-
LIS
18h 45m
2 stops
Delta Logo
5:00 am - 11:55 pm
LIS
-
BOI
24h 55m
2 stops
$787Delta
Tue, Sep 8 - Sat, Sep 19
Scandinavian Airlines Logo
10:23 am - 11:15 pm
BOI
-
LIS
29h 52m
2 stops
Scandinavian Airlines Logo
10:55 pm - 8:18 pm
LIS
-
BOI
28h 23m
2 stops
$789Scandinavian Airlines
Tue, Oct 20 - Fri, Oct 30
Multiple Airlines Logo
10:37 am - 11:05 am
BOI
-
LIS
17h 28m
3 stops
Multiple Airlines Logo
1:00 pm - 1:30 pm
LIS
-
BOI
30h 30m
2 stops
$792Multiple Airlines
Wed, Oct 21 - Sat, Oct 31
United Airlines Logo
5:00 am - 9:20 am
BOI
-
LIS
21h 20m
2 stops
United Airlines Logo
1:00 pm - 10:16 pm
LIS
-
BOI
39h 16m
2 stops
$842United Airlines
Wed, Oct 21 - Sat, Oct 31
Multiple Airlines Logo
10:37 am - 11:05 am
BOI
-
LIS
17h 28m
3 stops
Multiple Airlines Logo
11:20 am - 10:43 am
LIS
-
BOI
29h 23m
2 stops
$870Multiple 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 September and July, when the average cost of round-trip tickets is $1,029 and $923 respectively.

Good to know

Low seasonFebruary
Cheapest flight$461
Best time to beat the crowds with an average 17% drop in price.
Most popular time to fly with an average 5% 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 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 8425 reviews
7.8Entertainment
7.2Food
7.8Comfort
8.1Boarding
8.5Crew
Airline reviews

Planes were clean, no water or snacks on either flight.

6.0 GoodAnonymous, May 2026
ECP - ATL
Read more Delta reviews

Planes were clean, no water or snacks on either flight.

Free & relatively fast Wi-Fi. Would've liked a wider drink selection.

I continue to be satisfied with Delta’s excellent service out of LGA. The digit id works well and gets me through security in no time. Whenever possible, I choose Delta.

Was revoked with Jet Blue due to delay from Kenya Air

The Boarding process was great. Particularly since my wife and I require assistance. The flight attendants were amazing. We travel frequently; they honestly were a cut above. 😀

Enjoyed it very much. Especially liked the free WiFi that Delta offers.

Smooth flight. Left on time, and got in 15 minutes early. Onboard video was great

For some reason, TSA Atlanta didn’t have my bag on the flight on time and they don’t have to provide Delta a reason for that.

WiFi didn’t work on two of four planes. Flight attendants were not overly friendly or welcoming. Planes were extremely slow to board and deplane.

Delta does a great job with entertainment and free wifi. I can still be in touch with my colleagues while in the air.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

Easy of boarding, helpfully staff at check in, surprisingly comfortable seating

Check in was chaotic with only one counter for business class and first class. The luggage conveyor belt at JFK airport was broken so the flight departure was delayed which made the flight stressful as I had a tight connection. Although the captain said they could make up the delay, they didn’t do so.

Had a one hour delay due to mechanical issue. I didn’t think I’d be able to make my connecting flight, but they waited for me and greeted me when I arrived to help things run smooth.

Lost of requested seat assignments. Lost my husband's meal choice

6 1/2 hours from Tampa to SFO on a Boeing 737. Cramped. No Service. No real food. One pass for coffee at the beginning and a second pass THREE hours later. And check-in in Tampa was nasty even by United standards. And I am at almost TWO million miles on United. It's a non-stop. But terrible service.

MY FAMILY'S LUGGAGE WAS LOST FROM ROME TO BARI. I WAS THE ONLY ONE THAT RECEIVED MY LUGGAGE FROM ROME TO BARI. AFTER DEPLANING IN BARI, WE WASTED A LOT OF TIME AT BAG CLAIMS LOST AND FOUND REPORTING THE CLAIM AND PLEADING FOR THE BAGS TO BE DELIVERED THE NEXT DAY. WE WERE TOLD THAT IT TAKES 3 DAYS MINIMUM TO DELIVER. MY DAUGHTER AND MY GIRLFRIEND NEEDED THEIR PERSONAL THINGS AND WE WERE STAYING 3 HOURS AWAY FROM THE BARI AIRPORT. WE HAD TO DRIVE 3 HOURS TO THE AIRPORT TO COLLECT OUR LOST LUGGAGE THE NEXT DAY. WE ARE NOT HAPPY WITH THE EXPERIENCE

We had a delay, but thankfully I made it to my connection. Overall it went smooth

The flight had a delay but I made it to my connection. Flight was smooth overall

As I wrote earlier, poor planning and/or communication. At least twice, we were told that we would be boarding in less than ten minutes, only to have the flight again delayed at least another hour.

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

Information on your arrival and departure airports