Cheap flights from Seattle, WA to Sidney, MT

Flights starting at $178. Choose between Cape Air, Alaska Airlines, or United Airlines to find the best price.

One search, all the flights

We find you the best flight deals and travel hacks so that you can choose how to book.

Rise above all travel anxieties

With the Kiwi.com Guarantee we have your back with whatever happens.

Trusted by millions

Join over 10 million yearly travellers booking with ease.

How much do flights to Sidney cost?

Key info about flying to Sidney

Depart from
Seattle–Tacoma International
Arrive to
Sidney–Richland Municipal
Average flights per week
32
Flight distance

Check-in for a flight from Seattle to Sidney

NameCarrier codeIATA CodePassport needed during booking
Cape AirKAP9KYes
Alaska AirlinesASAASNo
United AirlinesUALUAYes

Weather in Sidney

Average Weather

MonthAverage monthly max temperatureAverage monthly min temperature
January-3°C-12°C
February-3°C-12°C
March4°C-5°C
April11°C1°C
May18°C7°C
June25°C13°C
July29°C17°C
August28°C16°C
September23°C12°C
October13°C3°C
November4°C-4°C
December-3°C-10°C
Hottest Month
29°C
July
Coldest month
-12°C
January
Sunny days
288
days per year
Snow days
16
days per year

14 day forecast

Friday
6 Dec
3°C-10°C
13 Dec
1°C-5°C
Saturday
7 Dec
5°C-4°C
14 Dec
4°C-4°C
Sunday
8 Dec
4°C-1°C
15 Dec
18%
-5°C-11°C
Monday
9 Dec
-1°C-7°C
16 Dec
-2°C-10°C
Tuesday
10 Dec
73%
-6°C-15°C
17 Dec
87%
-3°C-8°C
Wednesday
11 Dec
13%
-5°C-15°C
18 Dec
62%
-10°C-15°C
Thursday
12 Dec
60%
3°C-10°C
19 Dec
-3°C-16°C
Travelers usually depart from Seattle–Tacoma International, or Kenmore Air Harbor Seaplane Base when they travel from Seattle to Sidney. The most popular airlines for this route are Cape Air, Alaska Airlines, and United Airlines. Seattle and Sidney have 32 direct flights per week.

Frequently asked questions

What are the most popular routes to and from Seattle?
What are the most popular routes to and from Sidney?
What airports are near Seattle?
What airports are near Sidney?
Which airlines fly between Seattle and Sidney?
When's the best time to travel between Seattle and Sidney?
What flights operate between Seattle and Sidney?
How many airports are there near Seattle?
How many airports are there near Sidney?
What time do nonstop (direct) flights between Seattle and Sidney depart?
What time do nonstop (direct) flights between Seattle and Sidney arrive?
What time do flights between Seattle and Sidney depart?
What time do flights between Seattle and Sidney arrive?

Explore alternative trips

Flights from Seattle

Flights to Sidney

Popular routes

The nearest countries with flights to Sidney

Here is a list of countries people are flying from

Other destination countries from Seattle

Here is a list of countries people are flying to
Find the best connection from Seattle to Sidney
Search flights

Get more out of Kiwi.com with our mobile application

Download boarding passes

One-click booking

Get exclusive offers and prices

Mobile trip notifications

We hack the system,
you fly for less