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Cheap flights from Idaho to Portugal from $387

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Idaho to Portugal departing on 9/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Idaho to Portugal

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
7:05 pm - 9:20 am
BOI
-
LIS
31h 15m
2 stops
Air Canada Logo
1:00 pm - 4:49 pm
LIS
-
BOI
34h 49m
2 stops
$726Air Canada
Mon, Oct 19 - Tue, Nov 3
Air Canada Logo
5:00 am - 9:20 am
BOI
-
LIS
21h 20m
2 stops
Air Canada Logo
1:00 pm - 7:16 pm
LIS
-
BOI
37h 16m
2 stops
$727Air Canada
Sun, Oct 18 - Tue, Nov 3
United Airlines Logo
7:00 am - 10:15 am
BOI
-
LIS
20h 15m
2 stops
United Airlines Logo
1:00 pm - 9:16 pm
LIS
-
BOI
39h 16m
2 stops
$728United Airlines
Mon, Nov 2 - Thu, Nov 5
American Airlines Logo
1:14 pm - 2:50 pm
GEG
-
LIS
17h 36m
2 stops
American Airlines Logo
6:30 am - 8:55 pm
LIS
-
GEG
22h 25m
2 stops
$728American Airlines
Wed, Nov 4 - Wed, Nov 11
United Airlines Logo
6:25 am - 8:20 am
BOI
-
LIS
18h 55m
2 stops
United Airlines Logo
5:00 am - 11:59 pm
LIS
-
BOI
25h 59m
2 stops
$730United Airlines
Sun, Oct 18 - Tue, Nov 3
Air Canada Logo
7:05 pm - 11:00 am
BOI
-
LIS
33h 55m
2 stops
Air Canada Logo
1:00 pm - 5:55 pm
LIS
-
BOI
35h 55m
2 stops
$731Air Canada
Sat, Oct 24 - Tue, Nov 3
American Airlines Logo
3:32 pm - 5:45 pm
JAC
-
LIS
19h 13m
2 stops
American Airlines Logo
11:05 am - 11:54 am
LIS
-
JAC
31h 49m
2 stops
$911American Airlines
Sun, Oct 4 - Mon, Oct 12
Virgin Atlantic Logo
5:37 pm - 8:00 am
GEG
-
LIS
30h 23m
2 stops
Virgin Atlantic Logo
12:45 pm - 11:55 pm
LIS
-
GEG
19h 10m
2 stops
$1,127Virgin Atlantic
Sat, Jun 20 - Fri, Jul 3
Multiple Airlines Logo
11:30 am - 3:15 pm
GEG
-
LIS
19h 45m
3 stops
Multiple Airlines Logo
1:00 pm - 10:55 am
LIS
-
GEG
29h 55m
2 stops
$1,133Multiple Airlines
Wed, Nov 4 - Wed, Nov 11
Multiple Airlines Logo
4:30 pm - 5:50 pm
GEG
-
LIS
17h 20m
2 stops
Multiple Airlines Logo
5:00 am - 4:11 pm
LIS
-
GEG
19h 11m
2 stops
$1,168Multiple Airlines
Mon, Jun 22 - Tue, Jun 30

American Airlines flights from Idaho to Portugal

Our best American Airlines deals on Idaho to Portugal flight tickets
American Airlines
Nov 4
GEG1:14 pmSpokane
17h 36m
2 stops
LIS2:50 pmLisbon Humberto Delgado
Nov 11
LIS6:30 amLisbon Humberto Delgado
22h 25m
2 stops
GEG8:55 pmSpokane
$728
American Airlines
Oct 4
JAC3:32 pmJackson Hole
19h 13m
2 stops
LIS5:45 pmLisbon Humberto Delgado
Oct 12
LIS11:05 amLisbon Humberto Delgado
31h 49m
2 stops
JAC11:54 amJackson Hole
$911

Delta flights from Idaho to Portugal

Our best Delta deals on Idaho to Portugal flight tickets
Delta
Oct 19
BOI4:05 pmBoise Air Term. Gowen Fld
18h 45m
2 stops
LIS5:50 pmLisbon Humberto Delgado
Oct 28
LIS5:00 amLisbon Humberto Delgado
19h 33m
2 stops
BOI6:33 pmBoise Air Term. Gowen Fld
$788
Delta
Oct 18
BOI5:40 amBoise Air Term. Gowen Fld
19h 20m
2 stops
LIS8:00 amLisbon Humberto Delgado
Nov 1
LIS10:00 amLisbon Humberto Delgado
20h 55m
2 stops
BOI11:55 pmBoise Air Term. Gowen Fld
$793
Delta
Oct 24
BOI4:05 pmBoise Air Term. Gowen Fld
34h 55m
2 stops
LIS10:00 amLisbon Humberto Delgado
Oct 28
LIS5:00 amLisbon Humberto Delgado
19h 33m
2 stops
BOI6:33 pmBoise Air Term. Gowen Fld
$799

momondo Fare Finder

 
Customize your flight search to find flights from Idaho to Portugal that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated May 20, 2026.
Use the filters below to find and compare flights from Idaho to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Mon 10/19

7:05 pm-9:20 am

2 stops31h 15m

Lisbon Humberto Delgado

Tue 11/3

1:00 pm-4:49 pm

2 stops34h 49m

$726

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 10/18

5:00 am-9:20 am

2 stops21h 20m

Lisbon Humberto Delgado

Tue 11/3

1:00 pm-7:16 pm

2 stops37h 16m

$727

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Mon 11/2

7:00 am-10:15 am

2 stops20h 15m

Lisbon Humberto Delgado

Thu 11/5

1:00 pm-9:16 pm

2 stops39h 16m

$728

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Wed 11/4

1:14 pm-2:50 pm

2 stops17h 36m

Lisbon Humberto Delgado

Wed 11/11

6:30 am-8:55 pm

2 stops22h 25m

$728

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sun 10/18

6:25 am-8:20 am

2 stops18h 55m

Lisbon Humberto Delgado

Tue 11/3

5:00 am-11:59 pm

2 stops25h 59m

$730

BoiseLisbon

BOI - LIS

BOILIS

Boise Air Term. Gowen Fld

Sat 10/24

7:05 pm-11:00 am

2 stops33h 55m

Lisbon Humberto Delgado

Tue 11/3

1:00 pm-5:55 pm

2 stops35h 55m

$731

JacksonLisbon

JAC - LIS

JACLIS

Jackson Hole

Sun 10/4

3:32 pm-5:45 pm

2 stops19h 13m

Lisbon Humberto Delgado

Mon 10/12

11:05 am-11:54 am

2 stops31h 49m

$911

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Sat 6/20

5:37 pm-8:00 am

2 stops30h 23m

Lisbon Humberto Delgado

Fri 7/3

12:45 pm-11:55 pm

2 stops19h 10m

$1,127

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Wed 11/4

11:30 am-3:15 pm

3 stops19h 45m

Lisbon Humberto Delgado

Wed 11/11

1:00 pm-10:55 am

2 stops29h 55m

$1,133
Quickest round-trip

SpokaneLisbon

GEG - LIS

GEGLIS

Spokane

Mon 6/22

4:30 pm-5:50 pm

2 stops17h 20m

Lisbon Humberto Delgado

Tue 6/30

5:00 am-4:11 pm

2 stops19h 11m

$1,168

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Portugal from

How to get the cheapest flight ticket from Idaho to Portugal

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Portugal?

The cheapest month to fly to Portugal from Idaho is in January. Flight prices, which tend to average around $0, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of January, then book flights to Portugal from Idaho during February instead. Flights to Portugal in February, while not as cheap as those in January, still average around $467.

Cheap Idaho to Portugal flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Idaho to Portugal

Fastest flight time

17h 53m

Direct flights

None
The fastest flight from Idaho to Portugal takes 17h 53m
There are no direct flights from Idaho to Portugal. There are no popular flight routes from Idaho to Portugal.
Search flight deals

Frequently asked questions about flying from Idaho to Portugal

  • When did momondo last update prices for flights from Idaho to Portugal?

    Prices for flights from Idaho to Portugal refresh daily.

  • How many operators does momondo search for flights from Idaho to Portugal?

  • How old do you have to be to fly from Idaho to Portugal?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Idaho to Portugal.

  • What documentation or ID do you need to fly to Portugal?

    The necessary travel and health documents for your Portugal trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Idaho to Portugal

Compare and see reviews for airlines that fly from Idaho to Portugal with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $549Free CancellationRating
7.9
8,454 reviews
Search Delta flights
United AirlinesPriceFrom $601Free CancellationRating
7.4
9,736 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Idaho to Portugal?

Finding the right flight to Portugal from Idaho is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Portugal quick and easy, saving you time and money.

Can I find flights from Idaho to Portugal with flexible booking policies on momondo?

momondo does allow users to show only those flights to Portugal from Idaho which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Idaho to Portugal?

Once all potential Idaho to Portugal flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Idaho to Portugal right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Portugal from Idaho. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Portugal trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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Find better results for your trip to Portugal

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