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This is the popular-routes view of CheapOair's inventory: the destinations that carry the most traffic, which is precisely why they can be cheap. Heavily served city pairs have multiple airlines competing on the same route, and competition on trunk routes drives fares down in a way that thin regional routes never see. Code TOP40 applies up to $40 off through 6 September. The counterintuitive lesson is that flying somewhere obvious is often cheaper than flying somewhere obscure and closer, because the obscure route has one carrier and no pressure on price. Browse the destination list and compare against the route you had in mind.

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Code TOP40 applies up to $40 off bookings at CheapOair, entered at checkout.
Heavily served routes have multiple airlines competing on the same city pair, which pushes fares down. Thin regional routes usually have one carrier and no price pressure.
The list covers CheapOair's highest-traffic city pairs and changes with demand and seasonal capacity.
The promotion runs through 6 September 2026.
No — Subscribsy is free for shoppers. Brands pay a referral fee when you choose their deal.
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