Frontier offers extra comfort seats with 32” separation for a fee, enhancing short flight comfort.
Frontier’s Zone 1 boarding is available with a carry-on purchase or special fare bundle.

Round-trip from | $94 (CheapOair) |
|---|---|
One-way from | $48 (Kiwi.com) |
Popular in | December |
Cheapest in | August |
Average price | $307 |
Fly from
Fly to
Route
Depart
Return
Price
SeattlePhoenix
SEA - PHX
SEAPHX
Seattle/Tacoma Intl
Wed 3/4
7:55 pm-11:50 pm
Nonstop2h 55m
Phoenix Sky Harbor Intl
Wed 3/11
8:45 am-12:00 pm
Nonstop3h 15m
SeattlePhoenix
SEA - PHX
SEAPHX
Seattle/Tacoma Intl
Thu 2/5
5:00 am-8:45 am
Nonstop2h 45m
Phoenix Sky Harbor Intl
Mon 2/9
9:05 pm-11:15 pm
Nonstop3h 10m
SeattlePhoenix
SEA - PHX
SEAPHX
Seattle/Tacoma Intl
Wed 2/18
10:19 am-2:18 pm
Nonstop2h 59m
Phoenix Sky Harbor Intl
Mon 2/23
8:56 pm-11:12 pm
Nonstop3h 16m
SeattlePhoenix
SEA - PHX
SEAPHX
Seattle/Tacoma Intl
Sat 1/31
7:10 am-11:08 am
Nonstop2h 58m
Phoenix Sky Harbor Intl
Tue 2/3
2:45 pm-4:59 pm
Nonstop3h 14m
SeattlePhoenix
SEA - PHX
SEAPHX
Seattle/Tacoma Intl
Wed 2/18
7:55 pm-11:50 pm
Nonstop2h 55m
Phoenix Sky Harbor Intl
Tue 3/3
12:01 pm-2:18 pm
Nonstop3h 17m
SeattlePhoenix
SEA - PHX
SEAPHX
Seattle/Tacoma Intl
Tue 1/27
7:10 am-11:08 am
Nonstop2h 58m
Phoenix Sky Harbor Intl
Mon 2/2
7:59 pm-10:17 pm
Nonstop3h 18m
SeattlePhoenix
SEA - PHX
SEAPHX
Seattle/Tacoma Intl
Fri 3/13
1:49 pm-4:39 pm
Nonstop2h 50m
Phoenix Sky Harbor Intl
Wed 3/18
3:45 pm-6:54 pm
Nonstop3h 09m
SeattlePhoenix
SEA - PHX
SEAPHX
Seattle/Tacoma Intl
Sat 1/17
5:30 pm-9:17 pm
Nonstop2h 47m
Phoenix Sky Harbor Intl
Sat 1/24
6:20 am-8:40 am
Nonstop3h 20m
SeattlePhoenix
SEA - PHX
SEAPHX
Seattle/Tacoma Intl
Fri 3/13
1:49 pm-4:39 pm
Nonstop2h 50m
Phoenix Sky Harbor Intl
Sun 3/15
6:15 am-9:24 am
Nonstop3h 09m
SeattlePhoenix
SEA - PHX
SEAPHX
Seattle/Tacoma Intl
Sun 2/22
7:10 am-11:06 am
Nonstop2h 56m
Phoenix Sky Harbor Intl
Tue 3/3
6:05 am-8:22 am
Nonstop3h 17m
To ensure you get the cheapest price possible for a flight from Seattle to Phoenix, you should look to book at least 67 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
Currently, February is the cheapest month in which you can book a flight from Seattle to Phoenix (average of $53). Flying from Seattle to Phoenix in December is currently the most expensive (average of $97). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
One of the essential ways to save on airfare from Seattle to Phoenix is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 55% on airfare.
Travelers seeking maximum savings on their Seattle to Phoenix flight should consider departing on Wednesday evenings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from SEA to PH1 are scheduled on a Monday (60 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (20 on average).
About 15% of weekly flights between Seattle and Phoenix have experienced delays in the past year, with the average delay time being 130 minutes.
Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
Tuesday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Over the last year, Delta have had the lowest number of delays on this route, with just 9% of flights being delayed.
Boarding
Crew
Comfort
Food
Overall
Entertainment
Reviews
Anonymous,Sep 2025
SEA - MKE
Boarding
Crew
Comfort
Food
Overall
Entertainment
Reviews
Anonymous,Sep 2025
SEA - MKE
Boarding
Crew
Comfort
Food
Overall
Entertainment
Reviews
Anonymous,Sep 2025
SEA - MKE
Boarding
Crew
Comfort
Food
Overall
Entertainment
Reviews
Anonymous,Sep 2025
SEA - MKE
Boarding
Crew
Comfort
Food
Overall
Entertainment
Reviews
Anonymous,Sep 2025
SEA - MKE
Boarding
Crew
Comfort
Food
Overall
Entertainment
Reviews
Anonymous,Sep 2025
SEA - MKE
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$53 | Average$174 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$65 | Average$177 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$83 | Average$209 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$101 | Average$225 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$135 | Average$283 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$136 | Average$267 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$167 | Average$328 | FlexibilityNo cancel fee | On-time71% |