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The average roundtrip price from Phoenix (PHX) to Seattle (SEA) is $120-$350, but you can snag a deal for $89 on Southwest if you book early. I've seen prices jump $150+ during peak summer months, so timing matters.
Alaska Airlines typically runs $199-$275 roundtrip, while Delta and American hover around $220-$320. Last-minute deals rarely exist on this route—book 2-3 months ahead for the best rates. I've seen $350+ tickets for just 24 hours before departure, which is a rip-off.
Southwest is my top pick for this route. They fly nonstop 7 days a week from PHX to SEA, with no checked bag fees and free seat selection. A $149 one-way on Southwest beats the $180 Delta price every time.
Alaska Airlines is reliable for service but charges $35 for the first checked bag and has less legroom (30 inches vs. Southwest’s 32 inches). I’d avoid American Airlines on this route—they’ve had 32% on-time departures this year, which is terrible for a major carrier.
Book 60-90 days out for the cheapest fares. Flights booked 75 days ahead averaged $137 roundtrip last month, while those booked 30 days out were $212. My rule? Never wait until the last minute—prices surge 40% within 2 weeks of departure.
August is the worst month to fly, with average prices hitting $320. June and September are sweet spots—$125-$160 roundtrip. I’ve flown this route in October for $110 roundtrip, which is a steal for fall foliage season.
PHX is the only major airport for Phoenix—don’t waste time searching for alternatives. For Seattle, consider Portland (PDX), which is 100 miles from downtown. A PHX to PDX flight costs $95-$150 roundtrip, then you take a $25 shuttle to Seattle.
PDX is worth it if you book a $99 roundtrip PHX-PDX flight and skip the $45+ airport transfer fees at SEA. But if you have luggage, the extra drive time makes it a hassle. I’ve taken the shuttle from PDX to Seattle 12 times—never regretted it.
Always check Southwest’s website directly—third-party sites add $20-$30 for the same fare. They also offer free checked bags for all flights, unlike competitors. I’ve saved $70 on a recent trip by booking this way.
Arrive 90 minutes early at PHX for domestic flights—security lines get chaotic during tourist season. And don’t bother with airport lounges; Alaska’s Priority Pass costs $35, but you can grab a coffee at the airport for $4.50 instead.
My biggest caveat: Avoid flying Southwest on weekends. Their PHX-SEA flights are 70% full on Fridays/Sundays, meaning no seat changes if you need to move. I once got stuck in economy with no aisle seat for 3 hours—never again.
A: June and September offer the lowest prices, averaging $125 roundtrip. Avoid August and December when prices spike above $300.
A: Yes—fly PHX to Portland (PDX) for $95-$150 roundtrip, then take a $25 shuttle to Seattle. You save $50-$80 compared to SEA flights, but add 1.5 hours to your travel time.
A: No, Southwest includes two free checked bags on all flights. Delta and American charge $35 for the first bag, which adds up fast on family trips.
A: Nonstop flights take 2 hours 35 minutes. Southwest operates the fastest route with a 2:15 average flight time, while Alaska Airlines averages 2:40 due to routing.
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