Route-month airline fare signal

FareGlide found 2 cached Frontier Airlines (F9) fare samples for CLE to SEA inside June 2026. The lowest cached airline-month sample was $158. Use this as a filter recheck cue, not live inventory.

Route
CLE to SEA
Month
June 2026
Airline
Frontier Airlines (F9)
Cached low
$158
Stop mix
2 connecting

Cached airline dates inside this month

These rows are prior cached observations for Frontier Airlines in June 2026. Start with the cheapest cached date, then compare nearby weekdays and route-wide fares in current partner results.

Jun 2, 2026 $158 1 stop
Jun 5, 2026 $160 1 stop

Airline-month recheck plan

Keep route and month fixed first. If the airline filter is thin, widen to all carriers before changing destination, airport, or travel month.

Airline filter inside the month

Frontier Airlines in June 2026

Open current route results, keep the date window near June 2026, then apply the F9 airline filter.

First cached airline date

Jun 2, 2026 from $158

Use the cheapest cached airline date as the first live recheck, then compare nearby weekdays with the same trip length.

Stop filter

2 connecting samples

No cached nonstop row exists for this exact airline-month slice, so compare travel time before treating the fare as useful.

Price sanity

$158 to $160

2 cached samples support this route-month-airline cue. Confirm live fare rules before booking.

Route-month-airline decision brief

Use this brief when June 2026 and Frontier Airlines are both part of the search hypothesis for CLE to SEA.

Route-month-airline move

F9 after the month check

Start with the full CLE to SEA June 2026 search, then apply Frontier Airlines if current inventory is broad enough.

Airline-month evidence depth

2 cached samples

This slice is narrower than the route-month page, which has 2 cached month samples across all airlines.

Main airline-month risk

Carrier filter can thin results

If the live airline filter returns weak results, widen to all carriers before changing the travel month.

Best comparison follow-up

Frontier Airlines route page

Compare against the broader F9 route context from $158 before treating this month as the best airline window.

Connected route-month research

All airlines in June 2026 2 cached month samples / $158 low Frontier Airlines route page 2 cached carrier-route samples / $158 low Full route fare calendar 2 sampled months for this route Main route guide CLE to SEA planning context

What this page does not guarantee

  • It does not show live Frontier Airlines schedules, live seats, checkout prices, baggage rules, or refund terms.
  • It does not prove that Frontier Airlines will be cheapest for every date in June 2026.
  • It should be used to decide which airline and date filters to test after opening current partner results.