AirSource

Flights Miami → Seattle — September 19, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Saturday, September 19, 2026 on the Miami–Seattle route: 1 stop itinerary (2 flights) via Denver International (DEN), from Miami International (MIA) to Seattle-Tacoma (SEA), first flight Frontier Airlines F91279, departs 5:50 AM, arrives 3:08 PM, total travel time 12h 18m including layovers, flight time 7h 30m (layovers excluded), $181 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable. Price found in an Aviasales search on September 9, 2026 and read by AirSource on September 10, 2026, 20:47 UTC: it is not guaranteed and is confirmed on Aviasales at booking time. The cheapest direct flight observed: Alaska Airlines AS305, from Miami International (MIA) to Seattle-Tacoma (SEA), departs 6:16 PM, arrives 9:54 PM, direct, 6h 38m, $318 per person. Fare as listed by Aviasales: carry-on bag included, checked bag not included, changes not allowed, non-refundable.

Lowest price observed in the available data

1-stop itinerary (2 flights)

via Denver International (DEN) · first flight Frontier Airlines F91279

1 stop
Sat, Sep 19
Miami International (MIA)
12h 18m
1 stop
Sat, Sep 19
Seattle-Tacoma (SEA)
First flight
Frontier Airlines F91279 (1st of 2 flights)
Connecting flights
Operated after the layover in Denver International (DEN); airline and flight number are not provided by Aviasales in this record: see them on the booking site.
Departure
Miami International (MIA) · September 19, 2026 · local time (UTC-4)
Final arrival
Seattle-Tacoma (SEA) · September 19, 2026 · local time (UTC-7)
Stops
1 stop · in Denver International (DEN)
Total travel time
12h 18m (layovers included)
Flight time
7h 30m (layovers excluded)
Layover time
4h 48m
Carry-on bag
not included (personal item only)
Checked bag
not included
Changes
not allowed
Refund
non-refundable
Last observed price
$181 per person, one way
Observed
Price and fare conditions found in an Aviasales search on · read by AirSource on · more than 48 hours ago
Last observed price
$181
per person, one way
Check the current price and book

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Price not guaranteed: it is confirmed on Aviasales at booking time. How it works

Cheapest direct flight observed

Alaska Airlines AS305

Direct · Miami International (MIA) → Seattle-Tacoma (SEA)

Direct
Sat, Sep 19
Miami International (MIA)
6h 38m
direct
Sat, Sep 19
Seattle-Tacoma (SEA)
Airline
Alaska Airlines (AS)
Flight
AS305
Departure
Miami International (MIA) · September 19, 2026 · local time (UTC-4)
Arrival
Seattle-Tacoma (SEA) · September 19, 2026 · local time (UTC-7)
Stops
Direct (no plane change, as stated by the source; it can include a stop)
Duration
6h 38m
Carry-on bag
included
Checked bag
not included
Changes
not allowed
Refund
non-refundable
Last observed price
$318 per person, one way
Observed
Price and fare conditions found in an Aviasales search on · read by AirSource on · more than 48 hours ago
Last observed price
$318
per person, one way
Check the current price and book

Affiliate link. Booking, payment and support are handled by the seller you choose on Aviasales.

Price not guaranteed: it is confirmed on Aviasales at booking time. How it works

Looking for other times? All MiamiSeattle flights on September 19, 2026 on Aviasales.

Nearby dates