Cheap flights from Portland, ME to Boise, ID

Flights starting at £135. Choose between Frontier Airlines, Spirit Airlines, or Alaska Airlines to find the best price.

Make your travel wishlist, we'll do the rest
Hidden deals
Effortless booking
Travel hacking

Tips to know when travelling to Boise

Mailbox
Receive exclusive deals by email
The most popular airlines for this route are Frontier Airlines, Spirit Airlines, Alaska Airlines, Allegiant Air, and Sun Country Airlines. Portland and Boise have 61 direct flights per week.

Check-in for a flight from Portland to Boise

NameCarrier codeIATA CodePassport needed during bookingOnline check-in available
Frontier AirlinesFFTF9NoOpens 24 days before flight
Closes 1 hours before flight
Spirit AirlinesNKSNKNoOpens 24 days before flight
Closes 1 hours before flight
Alaska AirlinesASAASNoOpens 24 days before flight
Closes 1 hours before flight
Allegiant AirAAYG4NoOpens 24 days before flight
Closes 1 hours before flight
Sun Country AirlinesSCXSYYesNo

Weather in Boise

Average Weather

MonthAverage monthly max temperatureAverage monthly min temperature
January2°C-4°C
February5°C-2°C
March10°C1°C
April14°C3°C
May19°C8°C
June25°C13°C
July32°C18°C
August31°C17°C
September25°C13°C
October16°C6°C
November8°C0°C
December2°C-4°C
Hottest Month
32°C
July
Coldest month
-4°C
January
Sunny days
292
days per year
Snow days
15
days per year

14 day forecast

Thursday
21 Mar
96%
13°C9°C
28 Mar
87%
9°C2°C
Friday
22 Mar
17°C7°C
29 Mar
11°C3°C
Saturday
23 Mar
88%
10°C5°C
30 Mar
78%
16°C8°C
Sunday
24 Mar
86%
11°C3°C
31 Mar
80%
12°C6°C
Monday
25 Mar
88%
7°C2°C
1 Apr
86%
10°C4°C
Tuesday
26 Mar
10°C2°C
2 Apr
12°C2°C
Wednesday
27 Mar
88%
6°C3°C
3 Apr
16°C6°C

Frequently asked questions

What are the most popular routes to and from Portland?
What are the most popular routes to and from Boise?
What airports are near Portland?
What airports are near Boise?
Is it possible to combine flights, buses, and trains in one itinerary when traveling between Portland and Boise?
What is Virtual Interlining and how do I use it?
Which airlines fly between Portland and Boise?
When's the best time to travel between Portland and Boise?
What flights operate between Portland and Boise?
How many airports are there near Portland?
How many airports are there near Boise?
What time do nonstop (direct) flights between Portland and Boise depart?
What time do nonstop (direct) flights between Portland and Boise arrive?
What time do flights between Portland and Boise depart?
What time do flights between Portland and Boise arrive?

Explore alternative trips

Flights from Portland

Flights to Boise

Popular routes

Find the best connection from Portland to Boise
Search flights, trains & buses
We hack the system,
you fly for less